Single Output
A-Series, UWR Models
Features
High-Density, 2" x 1"
1-6 Amp, 9-15 Watt DC/DC's
Figure 1. Simplifi ed Schematic
The new 1.5V, 1.8V and 2.5V models in DATEL’s fl agship 9-15 Watt A-Series
can source a continuous 6 Amps. This is the most "low-voltage" current available
from a standard 1" x 2" package, and these power converters exemplify DATEL’s
relentless drive to bring you more power/current, from standard packages, without
compromising reliability or resorting to thermal specmanship.
By combining a high-frequency (310kHz), high-effi ciency (to 88%), synchronous-
rectifi er topology with the newest components and time-tested, fully automated,
SMT-on-pcb construction, these UWR Models are able to bring you 9-15W (@ up
to 6A) in the standard 2" x 1" package from which most competitors can only get
5-10W (@ 3-4A). All UWR’s deliver their full output power over ambient temperature
ranges from –40°C to as high as +70°C (model and input voltage dependent) without
heat sinks or supplemental forced-air cooling. Devices derate to +100°C.
Output voltages are 1.5, 1.8, 2.5, 3.3, 5, 12 or 15 Volts. Input voltage ranges
are 10-18V ("D12" models), 18-36V ("D24" models) or 36-75V ("D48") models. All
models feature input pi fi lters, input undervoltage and overvoltage lockout, input
reverse-polarity protection, output overvoltage protection, output current limiting, and
continuous short-circuit protection. On/off control, sync, and output-trim functions are
optional (see Optional Functions). All models are certifi ed to IEC950, UL1950 and
EN60950 safety requirements for OPERATIONAL insulation. "D48" models (36-75V
inputs) are CE marked.
UWR 9-15W DC/DC’s are packaged in low-cost, light-weight, diallyl phthalate
(UL94V-0 rated) plastic packages with standoffs. EMC compliance is achieved via a
low-noise design rather than through expensive metal shielding.
A- SERIES
INNOVATION and EX C ELL E N C
E
®®
–V
OUT
+V
IN
–V
IN
PWM
CONTROLLER
OPTO
ISOLATION
REFERENCE &
ERROR AMP
COMPARATORS
UVLO & OVLO
ON/OFF
CONTROL
OR SYNC
(
OPTIONAL
)
TRIM
(OPTIONAL)
+V
OUT
SWITCH
CONTROL
■
■
■
■
■
■
■
■
■
■
■
■
■
1.5/1.8/2.5VOUT models source 6 Amps
3.3VOUT models source 4.25 Amps
5/12/15VOUT models deliver full 15 Watts
310kHz synchronous-rectifi er topologies
Guaranteed effi ciencies to 86%
Choice of 3 input voltage ranges:
10-18V, 18-36V, 36-75V
–40 to +60/70°C ambient w/o derating
Fully isolated (1500Vdc); I/O protected
UL1950/EN60950 certifi ed
CE mark (75VIN models)
Standard 2" x 1" packages and pinouts
Optional VOUT trim, sync, on/off control
Pin compatible with Lucent LC/LW Series
1.5, 1.8, 2.5, 3.3V and 5V-output models use the synchronous-rectifi er confi guration shown above.
12V and 15V-output models employ a standard forward architecture.
DATEL, Inc., Mansfi eld, MA 02048 (USA) · Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 · Email: sales@datel.com · Internet: www.datel.com
NEW
1.5, 1.8 & 2.5 Volt
Models
A Series 9-15W, SINGLE OUTPUT DC/DC CONVERTERS
R/N (mVp-p) ➁ Regulation (Max.) Effi ciency Package
V
OUT IOUT VIN Nom. Range IIN ➃ (Case,
Model (Volts) (mA) Typ. Max. Line Load ➂ (Volts) (Volts) (mA) Min. Typ. Pinout)
2
Performance Specifi cations and Ordering Guide
➀ Typical at TA = +25°C under nominal line voltage and full-load conditions, unless otherwise noted.
➁ Ripple/Noise (R/N) is tested/speciifed over a 20MHz bandwidth. All models are specifi ed with two
external 0.47µF multi-layer ceramic capacitors installed across their output pins.
➀
UWR-1.5/6000-D12A 1.5 6000 45 65 ±0.2% ±0.3% 12 10-18 85/914 TBD 82% C14, P22
UWR-1.5/6000-D24A 1.5 6000 45 65 ±0.2% ±0.3% 24 18-36 50/454 TBD 82.5% C14, P22
UWR-1.5/6000-D48A 1.5 6000 45 65 ±0.2% ±0.3% 48 36-75 40/226 TBD 83% C14, P22
UWR-1.8/6000-D12A 1.8 6000 50 70 ±0.2% ±0.3% 12 10-18 85/1084 TBD 83% C14, P22
UWR-1.8/6000-D24A 1.8 6000 50 70 ±0.2% ±0.3% 24 18-36 50/539 TBD 83.5% C14, P22
UWR-1.8/6000-D48A 1.8 6000 50 70 ±0.2% ±0.3% 48 36-75 40/268 TBD 84% C14, P22
UWR-2.5/6000-D12A 2.5 6000 60 80 ±0.2% ±0.3% 12 10-18 80/1489 TBD 84% C14, P22
UWR-2.5/6000-D24A 2.5 6000 60 80 ±0.2% ±0.3% 24 18-36 45/740 TBD 84.5% C14, P22
UWR-2.5/6000-D48A 2.5 6000 60 80 ±0.2% ±0.3% 48 36-75 35/367 TBD 85% C14, P22
UWR-3.3/4250-D12A 3.3 4250 85 100 ±0.2% ±0.5% 12 10-18 80/1375 83% 85% C14, P22
UWR-3.3/4250-D24A 3.3 4250 85 100 ±0.2% ±0.5% 24 18-36 45/672 84.5% 87% C14, P22
UWR-3.3/4250-D48A 3.3 4250 85 100 ±0.2% ±0.5% 48 36-75 35/336 85% 87% C14, P22
UWR-5/3000-D12A 5 3000 85 100 ±0.2% ±0.3% 12 10-18 110/1471 83% 85% C14, P22
UWR-5/3000-D24A 5 3000 85 100 ±0.2% ±0.3% 24 18-36 55/710 85.5% 88% C14, P22
UWR-5/3000-D48A 5 3000 85 100 ±0.2% ±0.3% 48 36-75 35/355 85.5% 88% C14, P22
UWR-12/1250-D12A 12 1250 85 100 ±0.2% ±0.3% 12 10-18 20/1471 82.5% 85% C14, P22
UWR-12/1250-D24A 12 1250 85 100 ±0.2% ±0.3% 24 18-36 20/718 85% 87% C14, P22
UWR-12/1250-D48A 12 1250 85 100 ±0.2% ±0.3% 48 36-75 20/359 85% 87% C14, P22
UWR-15/1000-D12A 15 1000 85 100 ±0.2% ±0.3% 12 10-18 20/1471 82.5% 85% C14, P22
UWR-15/1000-D24A 15 1000 85 100 ±0.2% ±0.3% 24 18-36 20/718 85% 87% C14, P22
UWR-15/1000-D48A 15 1000 85 100 ±0.2% ±0.3% 48 36-75 20/359 85% 87% C14, P22
Wide Range Input
Output Confi guration:
U = Unipolar
Nominal Output Voltage:
1.5, 1.8, 2.5, 3.3, 5, 12 or 15 Volts
Maximum Output Current
in mA
Input Voltage Range:
D12 = 10-18 Volts (12V nominal)
D24 = 18-36 Volts (24V nominal)
D48 = 36-75 Volts (48V nominal)
UWR 4250-/D48 A-3.3
Optional Functions
T Trim function on pin 5. No pin 3.
C On/Off Control function (positive polarity) on pin 3. No pin 5.
CT On/Off Control function (positive polarity) on pin 3. Trim function on pin 5.
N On/Off Control function (negative polarity) on pin 3. No pin 5.
NT On/Off Control function (negative polarity) on pin 3. Trim function on pin 5.
S Sync function on pin 3. No pin 5.
ST Sync function on pin 3. Trim function on pin 5.
Blank -- No Trim function. No On/Off Control function.
* Pins 3 and 5 are optional.
See Optional Functions and
Technical Notes for details.
Case C14
CT
A-Series
High Reliability
Optional Functions
See Below
Output Input
PART NUMBER STRUCTURE MECHANICAL SPECIFICATIONS
Pin Function P22
1 +Input
2 –Input
3 On/Off Control*
4 +Output
5 Trim*
6 Common
I/O Connections
1
2
4
5
6
PLASTIC CASE
STANDOFF
0.020 (0.51)
3
1.00
(25.40)
2.00
(50.80)
0.20 MIN
(5.08)
0.400
(10.16)
0.800
(20.32)
0.800
(20.32)
0.60
(15.24)
0.49
(12.45)
0.040 ±0.002 DIA.
(1.016 ±0.051)
BOTTOM VIEW
0.200
(5.08)
0.100
(2.54)
0.10
(2.54)
➂ Load regulation is specifi ed over 10%-100% load conditions. 1.5-5V models are stable and
regulate under no-load conditions. 12/15V models have minimum loading requirements.
See Performance/Functional Specifi cations.
➃ Nominal line voltage, no-load/full-load conditions.
PRELIMINARY
UWR Models
9-15W, SINGLE OUTPUT DC/DC CONVERTERS
3
Performance/Functional Specifi cations
Typical @ TA = +25°C under nominal line voltage and full-load conditions, unless noted. ➀➁
Input Voltage:
Continuous:
D12 Models 22 Volts
D24 Models 44 Volts
D48 Models 88 Volts
Transient (100msec):
D12 Models 50 Volts
D24 Models 50 Volts
D48 Models 100 Volts
Input Reverse-Polarity Protection Current must be <10 Amps. Brief
duration only. Fusing recommended.
Output Overvoltage Protection:
1.5/1.8V Outputs TBD/TBD Volts, unlimited duration
2.5V/3.3V Outputs TBD/4.5 Volts, unlimited duration
5V/12V/15V Outputs 6.8/15/18 Volts, unlimited duration
Output Current Current limited. Devices can
withstand sustained output short
circuits without damage.
Case Temperature +100°C
Storage Temperature –40 to +105°C
Lead Temperature (soldering, 10 sec.) +300°C
These are stress ratings. Exposure of devices to any of these conditions may adversely
affect long-term reliability. Proper operation under conditions other than those listed in the
Performance/Functional Specifi cations Table is not implied.
Absolute Maximum Ratings
Input
Input Voltage Range:
D12A Models 10-18 Volts (12V nominal)
D24A Models 18-36 Volts (24V nominal)
D48A Models 36-75 Volts (48V nominal)
Overvoltage Shutdown:
D12A Models 18.5-21 Volts (20V typical)
D24A Models 37-40 Volts (38V typical)
D48A Models 77-81 Volts (78.5V typical)
Start-Up Threshold: ➂
D12A Models 9.4-9.8 Volts (9.6V typical)
D24A Models 16.5-18 Volts (17V typical)
D48A Models 34-36 Volts (35V typical)
Undervoltage Shutdown: ➂
D12A Models 7.5-8.5 Volts (8V typical)
D24A Models 16-17 Volts (16.5V typical)
D48A Models 32.5-35.5 Volts (34V typical)
Input Current:
Normal Operating Conditions See Ordering Guide
Standby Mode (Off, OV, UV) 5mA
Input Filter Type Pi
Reverse-Polarity Protection Brief duration, 10A maximum
On/Off Control (Optional, Pin 3): ➃ ➄
D12A, D24A, & D48A Models On = open or 13V - +VIN, IIN = 50µA max.
Off = 0-0.8V, IIN = 1mA max.
D12AN, D24AN, & D48AN Models On = 0-0.8V, IIN = 2.6mA max.
Off = open or 3.3-5.5V, IIN = 1mA max.
Sync (Optional, Pin 3) ➂ ➃
Input Threshold (Rising edge active) 1-2.7 Volts
Input Voltage Low 0-0.9 Volts
Input Voltage High 2.8-5 Volts
Input Resistance 35kΩ minimum
Output High Voltage (100µA load) 3.5-4.8 Volts
Output Drive Current 35mA
Input/Output Pulse Width 160-360nsec
Output
VOUT Accuracy (50% load):
1.5V/1.8V/2.5V/3.3V Outputs ±1.5%, maximum
5/12/15V Outputs ±1%, maximum
Minimum Loading for Specifi cation: ➁
1.5V/1.8V/2.5V/3.3V/5V Outputs No load
12V/15V Outputs 10% of IOUT max.
Minimum Loading for Stability: ➁
1.5V/1.8V/2.5V/3.3V/5V Outputs No load
12V/15V Outputs 25mA
Ripple/Noise (20MHz BW) ➀ ➅ See Ordering Guide
Line/Load Regulation See Ordering Guide
Effi ciency See Ordering Guide
Isolation Voltage:
Input-to-Output 1500Vdc minimum
Isolation Capacitance 470pF
Isolation Resistance 100MΩ
Current Limiting:
1.5V/1.8V/2.5V/3.3V/5V Outputs Hiccup technique, auto-recovery
12V/15V Outputs Power-limiting technique, auto-recovery
Overvoltage Protection Zener/transorb clamp, magnetic feedback
Temperature Coeffi cient ±0.04% per °C.
Dynamic Characteristics
Transient Response (50% load step) 200µsec max. to ±1.5% of fi nal value
Start-Up Time: ➂
VIN to VOUT 50msec
On/Off to VOUT 30msec
Switching Frequency 310kHz (±30kHz)
Environmental
Operating Temperature (Ambient):
Without Derating ➆ –40 to +60/70°C
With Derating to +100°C (See Derating Curves)
Case Temperature:
Maximum Allowable +100°C
Storage Temperature –40 to +105°C
Physical
Dimensions 2" x 1" x 0.49" (51 x 25 x 12.45mm)
Shielding None
Case Material Diallyl phthalate, UL94V-0 rated
Pin Material Brass, solder coated
Weight 1.4 ounces (39.7 grams)
➀ All models are specifi ed with two external 0.47µF multi-layer ceramic capacitors installed
across their output pins.
➁ See Minimum Output Loading Requirements under Technical Notes.
➂ See Technical Notes for details.
➃ The On/Off Control, Sync and Trim functions are optional and must be installed by DATEL.
See Optional Functions or contact DATEL for details.
➄ The On/Off Control is designed to be driven with open-collector logic or the application of
appropriate voltages (referenced to –Input (Pin 2)). Applying a voltage to the On/Off Control
pin when no input voltage is applied to the converter may cause permanent damage.
See Technical Notes.
➅ Output noise maybe further reduced with the addition of additional external output
capacitors. See Technical Notes.
➆ Operating temperature range without derating is model and input-voltage dependent.
See Temperature Derating.
A Series 9-15W, SINGLE OUTPUT DC/DC CONVERTERS
4
Trimming Output Voltages
These converters have a trim capability (pin 5) that allows users to adjust the
output voltage ±5%. Adjustments to the output voltage can be accomplished
via a trim pot, Figure 2, or a single fi xed resistor as shown in Figures 3 and 4.
A single fi xed resistor can increase or decrease the output voltage depending
on its connection. Fixed resistors should have an absolute TCR less than
100ppm/°C to minimize sensitivity to changes in temperature.
A single resistor connected from the Trim (pin 5) to the +Output (pin 4), see
Figure 3, will decrease the output voltage. A resistor connected from the Trim
(pin 5) to Output Common (pin 6) will increase the output voltage.
20kΩ
5-22
Tu r n s
+INPUT +OUTPUT
COMMON
TRIM
–INPUT
ON/OFF
CONTROL
1
2
3
4
5
LOAD
6
+INPUT +OUTPUT
COMMON
TRIM
–INPUT
ON/OFF
CONTROL
1
2
3
4
5
LOAD
6
RTRIM DOWN
+INPUT +OUTPUT
COMMON
TRIM
–INPUT
ON/OFF
CONTROL
1
2
3
4
5
LOAD
6
RTRIM UP
Figure 2. Trim Connections Using A Trim Pot
Figure 4. Trim Connections To Increase Output Voltage Using Fixed Resistors
Figure 3. Trim Connections To Decrease Output Voltage Using Fixed Resistors
–16.9
DOWN
RT (kΩ) = 3.3 – VO
2.49(VO – 1.27)
UWR-3.3/4250-D12A
UWR-3.3/4250-D24A
UWR-3.3/4250-D48A –16.9
UP
RT (kΩ) = VO – 3.3
3.16
–15
DOWN
RT (kΩ) = 5 – VO
2.49(VO – 2.527)
UWR-5/3000-D12A
UWR-5/3000-D24A
UWR-5/3000-D48A –15
UP
RT (kΩ) = VO – 5
6.292
–49.9
DOWN
RT (kΩ) = 12 – VO
6.34(VO – 5.714)
UWR-12/1250-D12A
UWR-12/1250-D24A
UWR-12/1250-D48A –49.9
UP
RT (kΩ) = VO – 12
36.23
–63.4
DOWN
RT (kΩ) = 15 – VO
7.87(VO – 7.136)
UWR-15/1000-D12A
UWR-15/1000-D24A
UWR-15/1000-D48A –63.4
UP
RT (kΩ) = VO – 15
56.16
Accuracy of adjustment is subject to tolerances or resistor values
and factory-adjusted output accuracy. VO = desired output voltage.
Model Trim Equation
TECHNICAL NOTES
Floating Outputs
Since these are isolated DC/DC converters, their outputs are "fl oating."
Designers will usually use the output Common (pin 6) as the ground/return of
the load circuit. You can, however, use the +Output (pin 4) as ground/return to
effectively reverse the output polarity.
Minimum Output Loading Requirements
1.5-5V models employ a synchronous-rectifi er design topology. All models
regulate within spec and are stable under no-load conditions. 12/15V models
employ a traditional forward architecture and require 10% loading (125mA for
12V models, 100mA for 15V models) to achieve their listed regulation specs.
12/15V models also have a minimum-load-for-stability requirement (25mA).
For 12/15V models, operation between 25mA and 10% loading will result
in stable operation but regulation may degrade. Operation under no-load
conditions will not damage the 12/15V devices; however they may not meet
all listed specifi cations.
Filtering and Noise Reduction
All A-Series UWR 9-15 Watt DC/DC Converters achieve their rated ripple and
noise specifi cations using the external input and output capacitors specifi ed
in the Performance/Functional Specifi cations table. In critical applications,
input/output noise may be further reduced by installing additional external I/O
caps. Input capacitors should be selected for bulk capacitance, low ESR and
high rms-ripple-current ratings. Output capacitors should be selected for low
ESR and appropriate frequency response. All caps should have appropriate
voltage ratings and be mounted as close to the converters as possible.
The most effective combination of external I/O capacitors will be a function
of your particular load and layout conditions. Our Applications Engineers will
be happy to recommend potential solutions and can discuss the possibility of
our modifying a given device’s internal fi ltering to meet your specifi c require-
ments. Contact our Applications Engineering Group for additional details.
Input Fusing
Certain applications and/or safety agencies may require the installation of
fuses at the inputs of power conversion components. Fuses should also be
used if the possibility of sustained, non-current-limited, input-voltage polarity
reversals exists. For DATEL A-Series UWR 9-15 Watt DC/DC Converters, you
should use slow-blow type fuses with values no greater than the following.
VIN Range Fuse Value
"D12A" Models 3 Amps
"D24A" Models 2 Amps
"D48A" Models 1 Amp
Trim adjustment greater than 5% can have an adverse effect on the convert-
er's performance and is not recommended.
UWR Models
9-15W, SINGLE OUTPUT DC/DC CONVERTERS
TEMPERATURE DERATING
The thermal performance of A-Series UWR 15 Watt DC/DC Converters is
depicted in the derating curves shown below. All devices, when operated at
full load, in still ambient air, over their full specifi ed input voltage range, can
safely operate to +60°C. All models, other than the D12A models (10-18 Volt
input range), can operate at higher ambient temperatures if the input range
is narrowed. For example, model UWR-5/3000-D48A can operate safely to
+70°C if the input range is kept between 36 and 48 Volts. Contact DATEL's
Applications Engineering Group if you need additional details.
5
Start-Up Threshold and Undervoltage Shutdown
Under normal start-up conditions, devices will not begin to regulate until the
ramping-up input voltage exceeds the Start-Up Threshold Voltage (35V for
"D48A" models). Once operating, devices will not turn off until the input volt-
age drops below the Undervoltage Shutdown/Lockout limit (34V for "D48A"
models). Subsequent re-start will not occur until the input is brought back
up to the Start-Up Threshold. This built-in hysteresis obviously avoids any
indeterminate on/off situations at a single voltage.
Start-Up Time
The VIN to VOUT Start-Up Time is the interval between the time at which
a ramping input voltage crosses the turn-on threshold point and the fully-
loaded output voltage enters and remains within its specifi ed accuracy band.
Actual measured times will vary with input source impedance, external input
capacitance, and the slew rate and fi nal value of the input voltage as it
appears to the converter.
The On/Off to VOUT Start-Up Time assumes the converter is turned off via
the On/Off Control with the nominal input voltage already applied to the
converter. The specifi cation defi nes the interval between the time at which the
converter is turned on and the fully-loaded output voltage enters and remains
within its specifi ed accuracy band.
Output Power (Watts)
Ambient Temperature (°C)
15.0
13.5
12.0
10.5
9.0
7.5
6.0
4.5
3
1.5
0
–400 404550556065707580859095100
VOUT = 5V, 12V and 15V
VOUT = 3.3V
D12A (10-18V) Temperature Derating Curves
Output Power (Watts)
Ambient Temperature (°C)
15.0
13.5
12.0
10.5
9.0
7.5
6.0
4.5
3
1.5
0
–400 404550556065707580859095100
VIN = 18V-27V
VIN = 18V-30V
VIN = 18V-36V
D24A Temperature Derating Curves for 5V, 12V and 15V Output Models
Output Power (Watts)
Ambient Temperature (°C)
D24A and D48A Temperature Derating Curves for 3.3V Output Models
14
12
10
8
6
4
2
0
–400 404550556065707580859095100
VIN = 18V-27V (D24A)
VIN = 36V-48V (D48A)
VIN = 18V-30V (D24A)
VIN = 36V-60V (D48A)
VIN = 18V-36V (D24A)
VIN = 36V-75V (D48A)
Output Power (Watts)
Ambient Temperature (°C)
15.0
13.5
12.0
10.5
9.0
7.5
6.0
4.5
3
1.5
0
–400 404550556065707580859095100
VIN = 36V-48V
VIN = 36V-60V
VIN = 36V-75V
D48A Temperature Derating Curves for 5V, 12V and 15V Output Models
A Series 9-15W, SINGLE OUTPUT DC/DC CONVERTERS
90
85
80
75
70
65
60
55
50
45
UWR-3.3/4250-D12A Efficiency vs. Line and Load
Load Current (Amps)
Efficiency (%)
V
IN
= 10V
V
IN
= 12V
V
IN
= 18V
0.4 0.9 1.4 1.8 2.3 2.8 3.3 3.8 4.3
90
85
80
75
70
65
60
55
50
45
UWR-3.3/4250-D24A Efficiency vs. Line and Load
Load Current
(
Am
p
s
)
Efficiency (%)
V
IN
= 18V
V
IN
= 24V
V
IN
= 36V
0.4 0.9 1.4 1.8 2.3 2.8 3.3 3.8 4.3
90
85
80
75
70
65
60
55
50
45
UWR-3.3/4250-D48A Efficiency vs. Line and Load
0.4 0.9 1.4 1.8 2.3 2.8 3.3 3.8 4.3
Load Current (Amps)
Efficiency (%)
V
IN
= 36V
V
IN
= 48V
V
IN
= 75V
90
85
80
75
70
65
60
55
50
45
40
UWR-5/3000-D12A Efficiency vs. Line and Load
Load Current (Amps)
Efficiency (%)
V
IN
= 10V
V
IN
= 12V
V
IN
= 18V
0.3 0.6 1.0 1.3 1.7 2 2.3 2.7 3
90
85
80
75
70
65
60
55
50
45
40
UWR-5/3000-D24A Efficiency vs. Line and Load
Load Current (Amps)
Efficiency (%)
V
IN
= 18V
V
IN
= 24V
V
IN
= 36V
0.3 0.6 1.0 1.3 1.7 2 2.3 2.7 3
90
85
80
75
70
65
60
55
50
45
40
UWR-5/3000-D48A Efficiency vs. Line and Load
0.3 0.6 1.0 1.3 1.7 2 2.3 2.7 3
Load Current (Amps)
Efficiency (%)
V
IN
= 36V
V
IN
= 48V
V
IN
= 75V
EFFICIENCY VS. LINE AND LOAD
6
UWR Models
9-15W, SINGLE OUTPUT DC/DC CONVERTERS
90
85
80
75
70
65
60
55
50
UWR-12/1250-D12A Efficiency vs. Line and Load
Load Current
(
Am
p
s
)
Efficiency (%)
V
IN
= 10V
V
IN
= 12V
V
IN
= 18V
0.1 0.2 0.4 0.5 0.7 0.8 1.0 1.1 1.3
90
85
80
75
70
65
60
55
50
UWR-12/1250-D24A Efficiency vs. Line and Load
Load Current (Amps)
Efficiency (%)
V
IN
= 18V
V
IN
= 24V
V
IN
= 36V
0.1 0.2 0.4 0.5 0.7 0.8 1.0 1.1 1.3
90
85
80
75
70
65
60
55
50
UWR-12/1250-D48A Efficiency vs. Line and Load
0.1 0.2 0.4 0.5 0.7 0.8 1.0 1.1 1.3
Load Current (Amps)
Efficiency (%)
V
IN
= 36V
V
IN
= 48V
V
IN
= 75V
90
85
80
75
70
65
60
55
UWR-15/1000-D12A Efficiency vs. Line and Load
0.1 0.2 0.3 0.4 0.6 0.7 0.8 0.9 1
Load Current (Amps)
Efficiency (%)
V
IN
= 10V
V
IN
= 12V
V
IN
= 18V
90
85
80
75
70
65
60
55
UWR-15/1000-D24A Efficiency vs. Line and Load
Load Current (Amps)
Efficiency (%)
V
IN
= 18V
V
IN
= 24V
V
IN
= 36V
0.1 0.2 0.3 0.4 0.6 0.7 0.8 0.9 1
90
85
80
75
70
65
60
55
UWR-15/1000-D48A Efficiency vs. Line and Load
Load Current (Amps)
Efficiency (%)
V
IN
= 36V
V
IN
= 48V
V
IN
= 75V
0.1 0.2 0.3 0.4 0.6 0.7 0.8 0.9 1
7
EFFICIENCY VS. LINE AND LOAD
A Series 9-15W, SINGLE OUTPUT DC/DC CONVERTERS
8
20mV/div, 20MHz BW
Output Ripple and Noise (PARD)
(VIN = nominal, 12V @ 1.25A, two external 0.47µF output capacitors.)
Output Ripple and Noise (PARD)
(VIN = nominal, 15V @ 1A, two external 0.47µF output capacitors.)
20mV/div, 20MHz BW
20mV/div, 20MHz BW
Output Ripple and Noise (PARD)
(VIN = nominal, 3.3V @ 4.25A, two external 0.47µF output capacitors.)
20mV/div, 20MHz BW
Output Ripple and Noise (PARD)
(VIN = nominal, 5V @ 3A, two external 0.47µF output capacitors.)
DATEL makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do
not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifi cations are subject to change without notice. The DATEL logo is a registered DATEL, Inc. trademark.
DATEL (UK) LTD. Tadley, England Tel: (01256)-880444
DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: 01-34-60-01-01
DATEL GmbH München, Germany Tel: 89-544334-0
DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-6354-2025
DS-0426B 3/01
DATEL, Inc. 11 Cabot Boulevard, Mansfi eld, MA 02048-1151
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
Internet: www.datel.com Email: sales@datel.com
Data Sheet Fax Back: (508) 261-2857
INNOVATION and EX C ELL E N C
E
®®
ISO-9001 REGISTERED
Typical Performance Curves
