Data Sheet
September 30, 2009
12V Austin LynxTM SMT Non-isolated Power Modules, Programmable:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 10A Output Current
* UL is a registered trademark of Underwriters Laboratories, Inc.
† CSA is a registered trademark of Canadian Standards Association.
‡ VDE is a trademark of Verband Deutscher Elektrotechniker e.V.
** ISO is a registered trademark of the International Organization of Standards
Document No: DS03-097 ver. 1.43
PDF name: austin lynx smt 12v x3.pdf
Applications
Distributed power architectures
Intermediate bus voltage applications
Telecommunications equipment
Servers and storage applications
Networking equipment
Features
Compliant to RoHS EU Directive 2002/95/EC (-Z
versions)
Compliant to ROHS EU Directive 2002/95/EC with
lead solder exemption (non-Z versions)
Delivers up to 10A of output current
High efficiency – 93% at 3.3V full load (VIN = 12.0V)
Small size and low profile:
33.00 mm x 13.46 mm x 8.28 mm
(1.300 in x 0.530 in x 0.326 in)
Low output ripple and noise
High Reliability:
Calculated MTBF = 4.4 M hours at 25oC Full-load
Output voltage programmable from 0.75 Vdc to 5.5
Vdc via external resistor
Line Regulation: 0.3% (typical)
Load Regulation: 0.4% (typical)
Temperature Regulation: 0.4% (typical)
Remote On/Off
Remote Sense
Output overcurrent protection (non-latching)
Overtemperature protection
Wide operating temperature range (-40°C to 85°C)
UL* 60950-1Recognized, CSA† C22.2 No. 60950-1-
03 Certified, and VDE‡ 0805:2001-12 (EN60950-1)
Licensed
ISO** 9001 and ISO 14001 certified manufacturing
facilities
Description
The 12V Austin LynxTM Programmable SMT (surface mount technology) power modules are non-isolated DC-DC
converters that can deliver up to 10A of output current with full load efficiency of 93% at 3.3V output. These
modules provide a precisely regulated output voltage programmable via an external resistor from 0.75Vdc to 5.5Vdc
over a wide range of input voltage (VIN = 10 – 14Vdc). Their open-frame construction and small footprint enable
designers to develop cost- and space-efficient solutions. Standard features include remote On/Off, remote sense,
output voltage adjustment, overcurrent and overtemperature protection.
RoHS Compliant
Data Sheet
September 30, 2009
12V Austin LynxTM SMT Non-isolated Power Modules Programmable:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 10A output current
LINEAGE POWER 2
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are
absolute stress ratings only, functional operation of the device is not implied at these or any other conditions in
excess of those given in the operations sections of the data sheet. Exposure to absolute maximum ratings for
extended periods can adversely affect the device reliability.
Parameter Device Symbol Min Max Unit
Input Voltage All VIN -0.3 15 Vdc
Continuous
Operating Ambient Temperature All TA -40 85 °C
(see Thermal Considerations section)
Storage Temperature All Tstg -55 125 °C
Electrical Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions.
Parameter Device Symbol Min Typ Max Unit
Operating Input Voltage All VIN 10 12.0 14.0 Vdc
Maximum Input Current All IIN,max 6.5 Adc
(VIN= VIN, min to VIN, max, IO=IO, max VO,set = 3.3Vdc)
Input No Load Current VO,set = 0.75 Vdc IIN,No load 40 mA
(VIN = 12.0Vdc, IO = 0, module enabled) VO,set = 3.3Vdc IIN,No load 100 mA
Input Stand-by Current All IIN,stand-by 2.0 mA
(VIN = 12.0Vdc, module disabled)
Inrush Transient All I2t 0.4 A2s
Input Reflected Ripple Current, peak-to-peak
(5Hz to 20MHz, 1μH source impedance; VIN, min to
VIN, max, IO= IOmax ; See Test configuration section)
All 20 mAp-p
Input Ripple Rejection (120Hz) All 30 dB
CAUTION: This power module is not internally fused. An input line fuse must always be used.
This power module can be used in a wide variety of applications, ranging from simple standalone operation to being
part of a complex power architecture. To preserve maximum flexibility, internal fusing is not included, however, to
achieve maximum safety and system protection, always use an input line fuse. The safety agencies require a fast-
acting fuse with a maximum rating of 15 A (see Safety Considerations section). Based on the information provided in
this data sheet on inrush energy and maximum dc input current, the same type of fuse with a lower rating can be
used. Refer to the fuse manufacturer’s data sheet for further information.
Data Sheet
September 30, 2009
12V Austin LynxTM SMT Non-isolated Power Modules Programmable:
10 – 14 Vdc input; 0.75Vdc to 5.5Vdc Output; 10A output current
LINEAGE POWER 3
Electrical Specifications (continued)
Parameter Device Symbol Min Typ Max Unit
Output Voltage Set-point All VO, set –2.0 ⎯ +2.0 % VO, set
(VIN=IN, min, IO=IO, max, TA=25°C)
Output Voltage All VO, set –2.5% ⎯ +3.5% % VO, set
(Over all operating input voltage, resistive load,
and temperature conditions until end of life)
Adjustment Range All VO 0.7525 5.5 % VO, set
Selected by an external resistor
Output Regulation
Line (VIN=VIN, min to VIN, max) All
⎯ 0.3 % VO, set
Load (IO=IO, min to IO, max) All
⎯ 0.4 % VO, set
Temperature (Tref=TA, min to TA, max) All
⎯ 0.4 % VO, set
Output Ripple and Noise on nominal output
(VIN=VIN, nom and IO=IO, min to IO, max
Cout = 1μF ceramic//10μFtantalum capacitors)
RMS (5Hz to 20MHz bandwidth) All ⎯ 12 15 mVrms
Peak-to-Peak (5Hz to 20MHz bandwidth) All ⎯ 30 50 mVpk-pk
External Capacitance
ESR ≥ 1 mΩ All CO, max ⎯ ⎯ 1000 μF
ESR ≥ 10 mΩ All CO, max ⎯ ⎯ 5000 μF
Output Current All Io 0 ⎯ 10 Adc
Output Current Limit Inception (Hiccup Mode ) All IO, lim ⎯ 200 ⎯ % Io
Output Short-Circuit Current All IO, s/c ⎯ 3 ⎯ Adc
(VO≤250mV) ( Hiccup Mode )
Efficiency VO, set = 0.75Vdc η 81.0 %
VIN= VIN, nom, TA=25°C VO, set = 1.2Vdc η 87.5 %
IO=IO, max , VO= VO,set V
O,set = 1.5Vdc η 89.0 %
V
O,set = 1.8Vdc η 90.0 %
V
O,set = 2.5Vdc η 92.0 %
V
O,set = 3.3Vdc η 93.0 %
V
O,set = 5.0Vdc η 95.0 %
Switching Frequency All fsw ⎯ 300 ⎯ kHz
Dynamic Load Response
(dIo/dt=2.5A/μs; VIN = VIN, nom; TA=25°C) All Vpk ⎯ 200 ⎯ mV
Load Change from Io= 50% to 100% of
Io,max; 1μF ceramic// 10 μF tantalum
Peak Deviation
Settling Time (Vo<10% peak deviation) All ts ⎯ 25 ⎯ μs
(dIo/dt=2.5A/μs; VIN = VIN, nom; TA=25°C) All Vpk ⎯ 200 ⎯ mV
Load Change from Io= 100% to 50%of Io,max:
1μF ceramic// 10 μF tantalum
Peak Deviation
Settling Time (Vo<10% peak deviation) All ts ⎯ 25 ⎯ μs
Data Sheet
September 30, 2009
12V Austin LynxTM SMT Non-isolated Power Modules Programmable:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 10A output current
LINEAGE POWER 4
Electrical Specifications (continued)
Parameter Device Symbol Min Typ Max Unit
Dynamic Load Response
(dIo/dt=2.5A/μs; V VIN = VIN, nom; TA=25°C) All Vpk ⎯ 100 ⎯ mV
Load Change from Io= 50% to 100% of Io,max;
Co = 2x150 μF polymer capacitors
Peak Deviation
Settling Time (Vo<10% peak deviation) All ts ⎯ 25 ⎯ μs
(dIo/dt=2.5A/μs; VIN = VIN, nom; TA=25°C) All Vpk ⎯ 100 ⎯ mV
Load Change from Io= 100% to 50%of Io,max:
Co = 2x150 μF polymer capacitors
Peak Deviation
Settling Time (Vo<10% peak deviation) All ts ⎯ 25 ⎯ μs
General Specifications
Parameter Min Typ Max Unit
Calculated MTBF (IO=IO, max, TA=25°C) 4,400,000 Hours
Weight ⎯ 5.6 (0.2) ⎯ g (oz.)
Data Sheet
September 30, 2009
12V Austin LynxTM SMT Non-isolated Power Modules Programmable:
10 – 14 Vdc input; 0.75Vdc to 5.5Vdc Output; 10A output current
LINEAGE POWER 5
Feature Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions. See Feature Descriptions for additional information.
Parameter Device Symbol Min Typ Max Unit
Remote On/Off Signal interface
(VIN=VIN, min to VIN, max; Open collector npn or equivalent
Compatible, Von/off signal referenced to GND
See feature description section)
Logic High (On/Off Voltage pin open - Module ON)
Von/Off All VIH ― ― V
IN V
Ion/Off All IIH ― ― 10 μA
Logic Low (Von/Off ≤ 0.3V – Module Off)
Von/Off All VIL ― ― 0.3 V
Ion/off All IIL ― ― 1 mA
Turn-On Delay and Rise Times
(IO=IO, max , VIN = VIN, nom, TA = 25 oC, )
Case 1: On/Off input is set to Logic Low (Module
ON) and then input power is applied (delay from
instant at which VIN =VIN, min until Vo=10% of Vo,set)
All Tdelay 3 msec
Case 2: Input power is applied for at least one second
and then the On/Off input is set to logic Low (delay from
instant at which Von/Off=0.3V until Vo=10% of Vo, set)
All Tdelay 3 msec
Output voltage Rise time (time for Vo to rise from 10%
of Vo,set to 90% of Vo, set)
All Trise ― 4 6 msec
Output voltage overshoot – Startup ― 1 % VO, set
IO= IO, max; VIN = 10.0 to 14Vdc, TA = 25 oC
Remote Sense Range All ― ― 0.5 V
Overtemperature Protection All Tref ⎯ 125 ⎯ °C
(See Thermal Consideration section)
Input Undervoltage Lockout
Turn-on Threshold All ⎯ 8.2 ⎯ V
Turn-off Threshold All ⎯ 8.0 ⎯ V
Data Sheet
September 30, 2009
12V Austin LynxTM SMT Non-isolated Power Modules Programmable:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 10A output current
LINEAGE POWER 6
Characteristic Curves
The following figures provide typical characteristics for the 12V Austin Lynx Programmable SMT modules at 25ºC.
70
72
74
76
78
80
82
84
86
88
90
02 46 810
Vin=14V
Vin=10V
Vin=12V
74
76
78
80
82
84
86
88
90
92
94
0246810
Vin=14V
Vin=10V
Vin=12V
EFFICIENCY, η (%)
OUTPUT CURRENT, IO (A)
EFFICIENCY, η (%)
OUTPUT CURRENT, IO (A)
Figure 1. Converter Efficiency versus Output Current
(Vout =1.2Vdc).
Figure 4. Converter Efficiency versus Output Current
(Vout = 2.5Vdc).
74
76
78
80
82
84
86
88
90
92
02 46 810
Vin=14V
Vin=10V
Vin=12V
77
79
81
83
85
87
89
91
93
95
0246810
Vin=14V
Vin=10V
Vin=12V
EFFICIENCY, η (%)
OUTPUT CURRENT, IO (A)
EFFICIENCY, η (%)
OUTPUT CURRENT, IO (A)
Figure 2. Converter Efficiency versus Output Current
(Vout = 1.5Vdc).
Figure 5. Converter Efficiency versus Output Current
(Vout = 3.3Vdc).
76
78
80
82
84
86
88
90
92
0246810
Vin=14V
Vin=10V
Vin=12V
78
80
82
84
86
88
90
92
94
96
0246810
Vin=14V
Vin=10V
Vin=12V
EFFICIENCY, η (%)
OUTPUT CURRENT, IO (A)
EFFICIENCY, η (%)
OUTPUT CURRENT, IO (A)
Figure3. Converter Efficiency versus Output Current
(Vout = 1.8Vdc).
Figure 6. Converter Efficiency versus Output Current
(Vout = 5.0Vdc).
Data Sheet
September 30, 2009
12V Austin LynxTM SMT Non-isolated Power Modules Programmable:
10 – 14 Vdc input; 0.75Vdc to 5.5Vdc Output; 10A output current
LINEAGE POWER 7
Characteristic Curves (continued)
The following figures provide typical characteristics for the 12V Austin Lynx Programmable SMT modules at 25ºC.
0
1
2
3
4
5
6
7 8 91011121314
Io = 10 A
Io =5A
Io=0 A
INPUT CURRENT, IIN (A)
INPUT VOLTAGE, VIN
(
V
)
OUTPUT CURRENT, OUTPUT VOLTAGE
IO (A) (2A/div) VO (V) (200mV/div)
TIME
,
t
(
5
μ
s/div
)
Figure 7. Input voltage vs. Input Current
(Vout = 3.3Vdc).
Figure 10. Transient Response to Dynamic Load
Change from 50% to 100% of full load (Vo = 3.3Vdc).
OUTPUT VOLTAGE
VO (V) (20mV/div)
TIME, t (2μs/div)
OUTPUT CURRENT, OUTPUT VOLTAGE
IO (A) (2A/div) VO (V) (200mV/div)
TIME, t (5 μs/div)
Figure 8. Typical Output Ripple and Noise
(Vin = 12.0V dc, Vo = 2.5 Vdc, Io=10A).
Figure 11. Transient Response to Dynamic Load
Change from 100% to 50% of full load (Vo = 3.3 Vdc).
OUTPUT VOLTAGE
VO (V) (20mV/div)
TIME, t (2μs/div)
OUTPUT CURRENT, OUTPUT VOLTAGE
IO (A) (2A/div) VO (V) (100mV/div)
TIME, t (10μs/div)
Figure 9. Typical Output Ripple and Noise
(Vin = 12.0V dc, Vo = 5.0 Vdc, Io=10A).
Figure 12. Transient Response to Dynamic Load
Change from 50% to 100% of full load (Vo = 3.3 Vdc,
Cext = 2x150 μF Polymer Capacitors).
Data Sheet
September 30, 2009
12V Austin LynxTM SMT Non-isolated Power Modules Programmable:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 10A output current
LINEAGE POWER 8
Characteristic Curves (continued)
The following figures provide typical characteristics for the 12V Austin Lynx Programmable SMT modules at 25ºC.
OUTPUT CURRENT, OUTPUTVOLTAGE
IO (A) (2A/div) VO (V) (100mV/div)
TIME, t (10μs/div)
OUTPUT VOLTAGE INPUT VOLTAGE
Vo (V) (2V/div) VIN (V) (5V/div)
TIME, t (2 ms/div)
Figure 13. Transient Response to Dynamic Load
Change from 100% of 50% full load (Vo = 5.0 Vdc, Cext
= 2x150
μ
F Pol
y
mer Ca
p
acitors
)
.
Figure 16. Typical Start-Up with application of Vin with
low-ESR polymer capacitors at the output (7x150 μF)
(
Vin = 12Vdc
,
Vo = 5.0Vdc
,
Io = 10A
,
Co = 1050
μ
F
)
.
OUTPUT VOLTAGE On/Off VOLTAGE
VOV) (1V/div) VOn/off (V) (5V/div)
TIME, t (1 ms/div)
OUTPUT VOLTAGE On/Off VOLTAGE
VOV) (1V/div) VOn/off (V) (2V/div)
TIME, t (2 ms/div)
Figure 14. Typical Start-Up Using Remote On/Off (Vin
= 12.0Vdc, Vo = 5.0Vdc, Io = 10.0A).
Figure 17 Typical Start-Up Using Remote On/Off with
Prebias (Vin = 12.0Vdc, Vo = 2.5Vdc, Io = 1.0A, Vbias
=1.2Vdc).
OUTPUT VOLTAGE On/Off VOLTAGE
VO (1V/div) VOn/off (V) (5V/div)
TIME, t (1 ms/div)
OUTPUT CURRENT,
IO (A) (10A/div)
TIME, t (10ms/div)
Figure 15. Typical Start-Up Using Remote On/Off with
Low-ESR external capacitors (Co= 5000μF) (Vin =
12.0Vdc, Vo = 5.0Vdc, Io = 10.0A, Co = 1050μF).
Figure 18. Output short circuit Current (Vin = 12.0Vdc,
Vo = 0.75Vdc).
Data Sheet
September 30, 2009
12V Austin LynxTM SMT Non-isolated Power Modules Programmable:
10 – 14 Vdc input; 0.75Vdc to 5.5Vdc Output; 10A output current
LINEAGE POWER 9
Characteristic Curves (continued)
The following figures provide thermal derating curves for the 12V Austin Lynx Programmable SMT modules.
0
1
2
3
4
5
6
7
8
9
10
11
20 30 40 50 60 70 80 90
100 LFM
200 LFM
NC
300 LFM
400 LFM
0
1
2
3
4
5
6
7
8
9
10
11
20 30 40 50 60 70 80 90
100 LFM
200 LFM
NC
300 LFM
400 LFM
OUTPUT CURRENT, Io (A)
AMBIENT TEMPERATURE, TA OC
OUTPUT CURRENT, Io (A)
AMBIENT TEMPERATURE, TA OC
Figure 19. Derating Output Current versus Local
Ambient Temperature and Airflow (Vin = 12.0 Vdc,
Vo=0.75Vdc).
Figure 22. Derating Output Current versus Local
Ambient Temperature and Airflow (Vin = 12.0 Vdc,
Vo=5.0 Vdc).
0
1
2
3
4
5
6
7
8
9
10
11
20 30 40 50 60 70 80 90
100 LFM
200 LFM
NC
300 LFM
400 LFM
OUTPUT CURRENT, Io (A)
AMBIENT TEMPERATURE, TA OC
Figure 20. Derating Output Current versus Local
Ambient Temperature and Airflow (Vin = 12.0Vdc,
Vo=1.8 Vdc).
0
1
2
3
4
5
6
7
8
9
10
11
20 30 40 50 60 70 80 90
10 0 L FM
200 LFM
NC
300 LFM
400 LFM
OUTPUT CURRENT, Io (A)
AMBIENT TEMPERATURE, T
A
O
C
Figure 21. Derating Output Current versus Local
Ambient Temperature and Airflow (Vin = 12.0Vdc,
Vo=3.3 Vdc).
Data Sheet
September 30, 2009
12V Austin LynxTM SMT Non-isolated Power Modules Programmable:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 10A output current
LINEAGE POWER 10
Test Configurations
TO OSCILLOSCOPE CURRENT PROBE
LTEST
1μH
BATTERY
CS 1000μF
Electrolytic
E.S.R.<0.1Ω
@ 20°C 100kHz
2x100μF
Tantalum
VIN(+)
COM
NOTE: Measure input reflected ripple current with a simulated
source inductance (LTEST) of 1μH. Capacitor CS offsets
possible battery impedance. Measure current as shown
above.
CIN
Figure 23. Input Reflected Ripple Current Test Setup.
NOTE: All voltage measurements to be taken at the module
terminals, as shown above. If sockets are used then
Kelvin connections are required at the module terminals
to avoid measurement errors due to socket contact
resistance.
V
O
(+)
COM
1uF .
RESISTIVE
LOAD
SCOPE
COPPER STRIP
GROUND PLANE
10uF
Figure 24. Output Ripple and Noise Test Setup.
VO
COM
VIN(+)
COM
RLOAD
Rcontac t Rdistribution
Rcontac t Rdistribution
Rcontact
Rcontact
Rdistribution
Rdistribution
VIN VO
NOTE: All voltage measurements to be taken at the module
terminals, as shown above. If sockets are used then
Kelvin connections are required at the module terminals
to avoid measurement errors due to socket contact
resistance.
Figure 25. Output Voltage and Efficiency Test Setup.
η =
VO. IO
VIN. IIN
x 100 %
Efficiency
Design Considerations
Input Filtering
The 12V Austin Lynx Programmable SMT module should
be connected to a low ac-impedance source. A highly
inductive source can affect the stability of the module. An
input capacitance must be placed directly adjacent to the
input pin of the module, to minimize input ripple voltage
and ensure module stability.
In a typical application, 4x47 µF low-ESR tantalum
capacitors (AVX part #: TPSE476M025R0100, 47µF 25V
100 mΩ ESR tantalum capacitor) will be sufficient to
provide adequate ripple voltage at the input of the
module. To minimize ripple voltage at the input, low
ESR ceramic capacitors are recommended at the input of
the module. Figure 26 shows input ripple voltage (mVp-
p) for various outputs with 4x47 µF tantalum capacitors
and with 4x22 µF ceramic capacitor (TDK part #:
C4532X5R1C226M) at full load.
Input Ripple Voltage (mVp-p)
0
50
10 0
150
200
250
300
0123456
Tantalum
Cer amic
Output Voltage (Vdc)
Figure 26. Input ripple voltage for various output
with 4x22 µF polymer and 4x47 µF ceramic capacitors
at the input (full load).
Data Sheet
September 30, 2009
12V Austin LynxTM SMT Non-isolated Power Modules Programmable:
10 – 14 Vdc input; 0.75Vdc to 5.5Vdc Output; 10A output current
LINEAGE POWER 11
Design Considerations (continued)
Output Filtering
The 12V Austin Lynx Programmable SMT module is
designed for low output ripple voltage and will meet the
maximum output ripple specification with 1 µF ceramic
and 10 µF tantalum capacitors at the output of the
module. However, additional output filtering may be
required by the system designer for a number of reasons.
First, there may be a need to further reduce the output
ripple and noise of the module. Second, the dynamic
response characteristics may need to be customized to a
particular load step change.
To reduce the output ripple and improve the dynamic
response to a step load change, additional capacitance at
the output can be used. Low ESR polymer and ceramic
capacitors are recommended to improve the dynamic
response of the module. For stable operation of the
module, limit the capacitance to less than the maximum
output capacitance as specified in the electrical
specification table.
Safety Considerations
For safety agency approval the power module must be
installed in compliance with the spacing and separation
requirements of the end-use safety agency standards,
i.e., UL 60950-1, CSA C22.2 No. 60950-1-03, and VDE
0850:2001-12 (EN60950-1) Licensed.
For the converter output to be considered meeting the
requirements of safety extra-low voltage (SELV), the
input must meet SELV requirements. The power module
has extra-low voltage (ELV) outputs when all inputs are
ELV.
The input to these units is to be provided with a fast-
acting fuse with a maximum rating of 15A in the positive
input lead.
Data Sheet
September 30, 2009
12V Austin LynxTM SMT Non-isolated Power Modules Programmable:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 10A output current
LINEAGE POWER 12
Feature Description
Remote On/Off
The 12V Austin Lynx Programmable SMT power modules
feature an On/Off pin for remote On/Off operation. If not
using the remote On/Off pin, leave the pin open (module
will be On). The On/Off pin signal (Von/Off) is referenced
to ground. To switch the module on and off using remote
On/Off, connect an open collector npn transistor between
the On/Off pin and the ground pin (See Figure 27).
During a logic-high (On/Off pin is pulled high internal to
the module) when the transistor is in the Off state, the
power module is ON. The maximum allowable leakage
current of the transistor when Von/off = VIN,max is 10µA.
During a logic-low when the transistor is turned-on, the
power module is OFF. During this state VOn/Off is less
than 0.3V and the maximum IOn/Off = 1mA.
Q1
R2
R1
Q2
R3
R4
Q3 CSS
GND
VIN+
ON/OFF
PWM Enable
+
_
ON/OFF
V
ION/OFF
MODULE
Figure 27. Remote On/Off Implementation.
Overcurrent Protection
To provide protection in a fault (output overload)
condition, the unit is equipped with internal
current-limiting circuitry and can endure current limiting
continuously. At the point of current-limit inception, the
unit enters hiccup mode. The unit operates normally once
the output current is brought back into its specified range.
The typical average output current during hiccup is 3 A.
Input Undervoltage Lockout
At input voltages below the input undervoltage lockout
limit, module operation is disabled. The module will begin
to operate at an input voltage above the undervoltage
lockout turn-on threshold.
Overtemperature Protection
To provide over temperature protection in a fault
condition, the unit relies upon the thermal protection
feature of the controller IC. The unit will shutdown if the
thermal reference point Tref, exceeds 125oC (typical), but
the thermal shutdown is not intended as a guarantee that
the unit will survive temperatures beyond its rating. The
module will automatically restart after it cools down.
Output Voltage Programming
The output voltage of the 12V Austin Lynx Programmable
SMT module can be programmed to any voltage from
0.75Vdc to 5.5Vdc by connecting a resistor (shown as
Rtrim in Figure 28) between Trim and GND pins of the
module. Without an external resistor between Trim and
GND pins, the output of the module will be 0.7525Vdc.
To calculate the value of the trim resistor, Rtrim for a
desired output voltage, use the following equation:
Ω
⎥
⎦
⎤
⎢
⎣
⎡−
−
=1000
7525.0
10500
Vo
Rtrim
For example, to program the output voltage of the 12V
Austin Lynx Programmable SMT module to 1.8 Vdc, Rtrim
is calculated is follows:
⎥
⎦
⎤
⎢
⎣
⎡−
−
=1000
75.08.1
10500
Rtrim
Ω= kRtrim 024.9
VO(+)
TRIM
GND
R
trim
LOAD
VIN(+)
ON/OFF
Vout
Figure 28. Circuit configuration for programming
output voltage using an external resistor.
Table 1 provides Rtrim values required for some common
output voltages
Table 1
VO, set (V) Rtrim (KΩ)
0.7525 Open
1.2 22.46
1.5 13.05
1.8 9.024
2.5 5.009
3.3 3.122
5.0 1.472
Data Sheet
September 30, 2009
12V Austin LynxTM SMT Non-isolated Power Modules Programmable:
10 – 14 Vdc input; 0.75Vdc to 5.5Vdc Output; 10A output current
LINEAGE POWER 13
Feature Descriptions (continued)
By using a 1% tolerance trim resistor, set point tolerance
of ±2% is achieved as specified in the electrical
specification. The POL Programming Tool, available at
www.lineagepower.com under the Design Tools section,
helps determine the required external trim resistor
needed for a specific output voltage.
The amount of power delivered by the module is defined
as the voltage at the output terminals multiplied by the
output current. When using the trim feature, the output
voltage of the module can be increased, which at the
same output current would increase the power output of
the module. Care should be taken to ensure that the
maximum output power of the module remains at or
below the maximum rated power (Pmax = Vo,set x Io,max).
Remote Sense
The 12V Austin Lynx Programmable SMT power modules
have a Remote Sense feature to minimize the effects of
distribution losses by regulating the voltage at the
Remote Sense and GND pins (See Figure 29). The
voltage between the Sense pin and Vo pin must not
exceed 0.5V. Although both the Remote Sense and the
TRIM features can increase the output voltage Vo, the
maximum increase is not the sum of both. The maximum
Vo increase is the larger of either the Remote Sense or
TRIM.
The amount of power delivered by the module is defined
as the output voltage multiplied by the output current (Vo
x Io). When using Remote Sense and/or TRIM, the
output voltage of the module can increase, which if the
same output is maintained, increases the power output by
the module. Make sure that the maximum output power
of the module remains at or below the maximum rated
power. When the Remote Sense feature is not being
used, leave the Remote Sense pin unconnected.
VO
COM
VIN(+)
COM
RLOAD
Rcontact Rdistribution
Rcontact Rdistribution
Rcontact
Rcontact
Rdistribution
Rdistribution
Sense
Figure 29. Remote sense circuit configuration
Voltage Margining
Output voltage margining can be implemented in the
12V Austin Lynx Programmable SMT modules by
connecting a resistor, Rmargin-up, from Trim pin to ground
pin for margining-up the output voltage and by
connecting a resistor, Rmargin-down, from Trim pin to
Output pin. Figure 30 shows the circuit configuration
for output voltage margining. The POL Programming
Tool, available at www.lineagepower.com under the
Design Tools section, also calculates the values of
Rmargin-up and Rmargin-down for a specific output voltage
and % margin. Please consult your local Lineage
Power technical representative for additional details
Vo
Austin Lynx or
Lynx II Series
GND
Trim
Q1
Rtrim
Rmargin-up
Q2
Rmargin-down
Figure 30. Circuit Configuration for margining
Output voltage.
Data Sheet
September 30, 2009
12V Austin LynxTM SMT Non-isolated Power Modules Programmable:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 10A output current
LINEAGE POWER 14
Thermal Considerations
Power modules operate in a variety of thermal
environments; however, sufficient cooling should always
be provided to help ensure reliable operation.
Considerations include ambient temperature, airflow,
module power dissipation, and the need for increased
reliability. A reduction in the operating temperature of the
module will result in an increase in reliability. The thermal
data presented here is based on physical measurements
taken in a wind tunnel. The test set-up is shown in Figure
32. Note that the airflow is parallel to the short axis of the
module as shown in figure 31. The derating data applies
to airflow in either direction of the module’s short axis.
Air Flow
Tref
Top View
Figure 31. Tref Temperature measurement location.
The thermal reference point, Tref used in the
specifications is shown in Figure 31. For reliable
operation this temperature should not exceed 115oC.
The output power of the module should not exceed the
rated power of the module (Vo,set x Io,max).
Please refer to the Application Note “Thermal
Characterization Process For Open-Frame Board-
Mounted Power Modules” for a detailed discussion of
thermal aspects including maximum device temperatures.
Figure 32. Thermal Test Set-up.
Heat Transfer via Convection
Increased airflow over the module enhances the heat
transfer via convection. Thermal derating curves showing
the maximum output current that can be delivered at
different local ambient temperatures (TA) for airflow
conditions ranging from natural convection and up to
2m/s (400 ft./min) are shown in the Characteristics
Curves section.
A
i
r
flow
x
Po w e r M o d ule
W
ind Tunne l
PWBs
8.3_
(0.325)
76.2_
(3.0)
Pro b e Lo c a t io n
for measuring
airflow and
ambient
temperature
25.4_
(1.0)
Data Sheet
September 30, 2009
12V Austin LynxTM SMT Non-isolated Power Modules Programmable:
10 – 14 Vdc input; 0.75Vdc to 5.5Vdc Output; 10A output current
LINEAGE POWER 15
Mechanical Outline
Dimensions are in millimeters and (inches).
Tolerances: x.x mm ± 0.5 mm (x.xx in. ± 0.02 in.) [unless otherwise indicated]
x.xx mm ± 0.25 mm (x.xxx in ± 0.010 in.)
Data Sheet
September 30, 2009
12V Austin LynxTM SMT Non-isolated Power Modules Programmable:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 10A output current
LINEAGE POWER 16
Recommended Pad Layout
Dimensions are in millimeters and (inches).
Tolerances: x.x mm ± 0.5 mm (x.xx in. ± 0.02 in.) [unless otherwise indicated]
x.xx mm ± 0.25 mm (x.xxx in ± 0.010 in.)
Data Sheet
September 30, 2009
12V Austin LynxTM SMT Non-isolated Power Modules Programmable:
10 – 14 Vdc input; 0.75Vdc to 5.5Vdc Output; 10A output current
LINEAGE POWER 17
Packaging Details
The 12V Austin Lynx Programmable SMT version is supplied in tape & reel as standard. Modules are shipped in
quantities of 250 modules per reel.
All Dimensions are in millimeters and (in inches).
Reel Dimensions:
Outside Dimensions: 330.2 mm (13.00)
Inside Dimensions: 177.8 mm (7.00”)
Tape Width: 44.00 mm (1.732”)
Data Sheet
September 30, 2009
12V Austin LynxTM SMT Non-isolated Power Modules Programmable:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 10A output current
LINEAGE POWER 18
Surface Mount Information
Pick and Place
The 12V Austin Lynx Programmable SMT modules
use an open frame construction and are designed for
a fully automated assembly process. The modules
are fitted with a label designed to provide a large
surface area for pick and place operations. The label
meets all the requirements for surface mount
processing, as well as safety standards, and is able to
withstand reflow temperatures of up to 300oC. The
label also carries product information such as product
code, serial number and the location of manufacture.
Figure 33. Pick and Place Location.
Nozzle Recommendations
The module weight has been kept to a minimum by
using open frame construction. Even so, these
modules have a relatively large mass when compared
to conventional SMT components. Variables such as
nozzle size, tip style, vacuum pressure and placement
speed should be considered to optimize this process.
The minimum recommended nozzle diameter for
reliable operation is 6mm. The maximum nozzle outer
diameter, which will safely fit within the allowable
component spacing, is 9 mm.
Oblong or oval nozzles up to 11 x 9 mm may also be
used within the space available.
Tin Lead Soldering
The Austin LynxTM 12 V SMT power modules are lead
free modules and can be soldered either in a lead-free
solder process or in a conventional Tin/Lead (Sn/Pb)
process. It is recommended that the customer review
data sheets in order to customize the solder reflow
profile for each application board assembly. The
following instructions must be observed when
soldering these units. Failure to observe these
instructions may result in the failure of or cause
damage to the modules, and can adversely affect
long-term reliability.
In a conventional Tin/Lead (Sn/Pb) solder process
peak reflow temperatures are limited to less than
235oC. Typically, the eutectic solder melts at 183oC,
wets the land, and subsequently wicks the device
connection. Sufficient time must be allowed to fuse
the plating on the connection to ensure a reliable
solder joint. There are several types of SMT reflow
technologies currently used in the industry. These
surface mount power modules can be reliably
soldered using natural forced convection, IR (radiant
infrared), or a combination of convection/IR. For
reliable soldering the solder reflow profile should be
established by accurately measuring the modules CP
connector temperatures.
REFLOW TEMP (°C)
0
50
10 0
15 0
200
250
300
Preheat zo ne
max 4
o
Cs
-1
Soak zo ne
30-240s
Heat zone
max 4
o
Cs
-1
Peak Temp 235
o
C
Co o ling
zo ne
1- 4
o
Cs
-1
T
lim
above
205
o
C
REFLOW TIME (S)
Figure 34. Reflow Profile for Tin/Lead (Sn/Pb)
process.
MAX TEMP SOLDER (°C)
200
205
210
215
220
225
230
235
240
0 102030405060
Figure 35. Time Limit Curve Above 205oC for
Tin/Lead (Sn/Pb) process.
Data Sheet
September 30, 2009
12V Austin LynxTM SMT Non-isolated Power Modules Programmable:
10 – 14 Vdc input; 0.75Vdc to 5.5Vdc Output; 10A output current
LINEAGE POWER 19
Surface Mount Information (continued)
Lead Free Soldering
The –Z version 12V Austin Lynx Programmable SMT
modules are lead-free (Pb-free) and RoHS compliant
and are both forward and backward compatible in a
Pb-free and a SnPb soldering process. Failure to
observe the instructions below may result in the
failure of or cause damage to the modules and can
adversely affect long-term reliability.
Pb-free Reflow Profile
Power Systems will comply with J-STD-020 Rev. C
(Moisture/Reflow Sensitivity Classification for
Nonhermetic Solid State Surface Mount Devices) for
both Pb-free solder profiles and MSL classification
procedures. This standard provides a recommended
forced-air-convection reflow profile based on the
volume and thickness of the package (table 4-2). The
suggested Pb-free solder paste is Sn/Ag/Cu (SAC).
The recommended linear reflow profile using
Sn/Ag/Cu solder is shown in Fig. 36.
MSL Rating
The 12V Austin Lynx Programmable SMT modules
have a MSL rating of 2.
Storage and Handling
The recommended storage environment and handling
procedures for moisture-sensitive surface mount
packages is detailed in J-STD-033 Rev. A (Handling,
Packing, Shipping and Use of Moisture/Reflow
Sensitive Surface Mount Devices). Moisture barrier
bags (MBB) with desiccant are required for MSL
ratings of 2 or greater. These sealed packages
should not be broken until time of use. Once the
original package is broken, the floor life of the product
at conditions of ≤ 30°C and 60% relative humidity
varies according to the MSL rating (see J-STD-033A).
The shelf life for dry packed SMT packages will be a
minimum of 12 months from the bag seal date, when
stored at the following conditions: < 40° C, < 90%
relative humidity.
Post Solder Cleaning and Drying
Considerations
Post solder cleaning is usually the final circuit-board
assembly process prior to electrical board testing. The
result of inadequate cleaning and drying can affect
both the reliability of a power module and the
testability of the finished circuit-board assembly. For
guidance on appropriate soldering, cleaning and
drying procedures, refer to Board Mounted Power
Modules: Soldering and Cleaning Application Note
(AN04-001).
Per J-STD-020 Rev. C
0
50
100
150
200
250
300
Reflow Time (Seconds)
Reflow Temp (°C)
Heating Zone
1°C/Second
Peak Temp 260°C
* Min. Time Above 235°C
15 Seconds
*Time Above 217°C
60 Seconds
Cooling
Zone
Figure 36. Recommended linear reflow profile
using Sn/Ag/Cu solder.
Data Sheet
September 30, 2009
12V Austin LynxTM SMT Non-isolated Power Modules Programmable:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 10A output current
LINEAGE POWER 20
Document No: DS03-097 ver. 1.43
PDF name: austin lynx smt 12v x3.pdf
Ordering Information
Please contact your Lineage Power Sales Representative for pricing, availability and optional features.
Table 2. Device Codes
Device Code Input
Voltage
Output
Voltage
Output
Current Efficiency Connector
Type Comcodes
AXA010A0X3-SR 10 – 14Vdc 0.75 – 5.5 V 10 A 93% SMT 108970138
AXA010A0X3-SRZ 10 – 14Vdc 0.75 – 5.5 V 10 A 93% SMT CC109101326
-Z refers to RoHS-compliant versions
World Wide Headquarters
Lineage Power Corporation
601 Shiloh Road, Plano, TX 75074, USA
+1-800-526-7819
(Outside U.S.A.: +1-972-244-9428)
www.lineagepower.com
e-mail: techsupport1@lineagepower.com
Asia-Pacific Headquarters
Tel: +65 6593 7211
Europe, Middle-East and Africa Headquarters
Tel: +49 898 780 672 80
India Headquarters
Tel: +91 80 28411633
Lineage Powe r reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or
a
pplication. No rights under any pate nt accompany the sale of any such product(s) or information.
Lineage Powe r DC-DC products are protected under various patents. Informa tion on these patents is available at www.lineagepower.com/patents.
©
2009 Linea
g
e Power Cor
p
oration
,
(
Plano
,
Texas
)
All Inte rnational Ri
g
hts Reserved.
