Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
©2006 Bel Fuse Inc. Specifications subject to change without notice. 11.06
POWER PRODUCTS
PISCES II DC/DC CONVERTERS
G2PW2V560
48V Input – 2.5VDC – 60A Output
† @ 60˚ C rise heat sink to ambient ‡ @ 300'/min.
Typical Characteristics
• Output setpoint accuracy: ± 1%
• Load regulation: ± 0.2%
• Line regulation: ± 0.2%
• Regulation over line, load,
and temperature: ± 2%
• Low output ripple
• Output trim
** T (Tuned Model) Option
Designed for higher di/dt and ∆l
applications, the transient response has
been modified to take advantage of the
capacitance on the customer’s PCB. This
unit requires a minimum load capacitance
of 5600µF with an impedance magnitude
of less than 0.005Ω at 15kHz. It offers
a minmum 3X improvement in the peak
response compared to a standard unit.
Consult factory.
Typical Thermal Performance
Part
Number Height Natural Convection
Power Dissipation†
Forced Convection
Thermal Resistance‡
001 0.25" 5W 5.8˚ C/W
002 0.50" 7W 3.2˚ C/W
003 1.00" 11W 2.0˚ C/W
004 0.13" TBD TBD
005 0.70" TBD TBD
Pisces II Heat Sink
Part Numbers
Example Part Number: (All options)
G2PW2V560 PSRT 00X
Part Number
Options:
Positive Logic Version
Optional Pin Lengths
E = 0.18"
M = 0.145"
S = 0.12"
Heat Sink Ready
Tuned Model
Heat Sink
Control Functions
page 1
G2PW2V560 – 1/4 Brick Pisces II Series
Ordering Information
• Industry standard pinout and footprint
• Very low dissipation
• No heat sink required for most applications
• Low profile, 0.38"
• High efficiency: 91% at 2.5V, 60A; 93% at 2.5V, 30A
• Very low common-mode noise for a commercial DC/DC converter
• Two-stage input filter
• Constant switching frequency
• Remote sense, wide trim range
• Single board design, very low parts count
• Optional baseplate or low profile heat sink for improved thermal performance
• Header with M3 metal inserts for mechanical connection to PCB
• Uses patented power supply control and architecture
• Microprocessor controlled
• Primary-side enable, choice of logic
Protection Features
• Over temperature protection
• Over voltage protection
• Over current protection
• Over/Under input voltage protection
Standard Model Number Input Voltage Output Voltage Max Current
G2PW2V560* 48V 2.5V 60A
* Options:
P = Positive Logic Version;
High = On
R = Heat Sink Ready
T = Tuned model**
E = 0.18" Pins (± .01")
M = 0.145" Pins (± .01")
S = 0.12" Pins (± .01")
©2006 Bel Fuse Inc. Specifications subject to change without notice. 11.06
POWER PRODUCTS
PISCES II DC/DC CONVERTERS
G2PW2V560
48V Input – 2.5VDC – 60A Output
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
page 2
Input Specifications
Parameter Min Typical Max Units
Operating Input Voltage 36 48 75 VDC
Input Current 6 A
Input Capacitance 4 µF
Input Hysteresis, Low Line 2 VDC
VIN = 48VDC, TA@25˚ C, 300 LFM Airflow, VOUT = 2.5VDC, IOUT = Full load unless otherwise noted.
Available output power depends on ambient temperature and good thermal management.
(See application graphs for limits.)
1. During short circuit, converter will shut down and attempt to restart once per second. The average current during this
condition will be very low and the device can be safely left in this condition continuously.
Output Specifications
Parameter Min Typical Max Units
Regulation Over Line, Load & Temperature 98 102 %VNOM
Voltage Ripple 25 mV RMS
Voltage Ripple, 20MHz BW 85 mV P–P
Current Range 0 60 A
Current Limit Inception 103 140 %IOUT
Short Circuit Current, Peak190 A
Output Transient Response, 50% to 75% Load Change, 1A/µsec 5 %VOUT
Settling Time to ± 1% 200 µS
Turn-on Time to 98% Vnom 35 mS
Output Overshoot at Turn-on 0 %VOUT
Trim Range 70 110 %VOUT
Over Voltage Protection, Latching 130 %VOUT
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
©2006 Bel Fuse Inc. Specifications subject to change without notice. 11.06
POWER PRODUCTS
PISCES II DC/DC CONVERTERS
G2PW2V560
48V Input – 2.5VDC – 60A Output
page 3
Isolation Specifications
Parameter Min Typical Max Units
Isolation Test Voltage, Input/Output (Basic) 2250 VDC
Isolation Test Voltage, Input/Case 2000 VDC
Isolation Test Voltage, Output Case 500 VDC
Isolation Resistance 10 MΩ
2. PCB less than 130˚ C.
Features
Parameter Min Typical Max Units
Over Temperature Protection, Thermal Sensor, Latching2110 ˚ C
Switching Frequency, Fixed 250 kHz
General Specifications
Operating Temperature -40˚ C to + 100˚ C
Storge Temperature -55˚ C + 125˚ C
Relative Humidity 10% to 95% RH, Non-condensing
Vibration 2 to 9 Hz, 3mm disp., 9 to 200 Hz, 1g
Material Flammability UL V-0
Weight 35 grams
MTBF Telcordia (Bellcore) 1.6 million hours
Approvals and Standards
UL and c-UL Recognized Component, TUV**,
UL60950, CSA 22.2 No. 950, IEC/EN 60950
EMC Characteristics:
Designed to meet emission and immunity
requirements per EN55022, CISPR 22,
Class B, and CISPR 24.
** An external fuse shall be used to comply with
the requirements.
©2006 Bel Fuse Inc. Specifications subject to change without notice. 11.06
POWER PRODUCTS
PISCES II DC/DC CONVERTERS
G2PW2V560
48V Input – 2.5VDC – 60A Output
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
page 4
Application Notes
CoolConverter™
Bel Power’s Proprietary CoolConverter™
• Patented single-stage power conversion architecture,
control and magnetic design allow unprecedented
power density and efficiency in an isolated power
supply.
Protection and Control
Valid Input Voltage Range
The converter measures the input voltage and will not allow
operation outside of the input voltage specification. As
shown by the graphs, hysteresis is added to both the high
and low voltage to prevent the converter from turning on and
off repeatedly when the voltage is held near either voltage
extreme. At low line, this assures the maximum input current
is not exceeded; at high line, this assures the semiconductor
devices in the converter are not damaged by excessive
voltage stress.
ON/OFF Logic Option
The ON/OFF control logic can be either Negative (standard)
or Positive to enable the converter. For Negative logic, the
ON/OFF pin is brought to below 1.0V with respect to the
–INPUT pin to enable the converter. The pull-down must be
able to sink 100µA. For Positive logic, the ON/OFF pin is
brought to greater than 4.0V with respect to the –INPUT pin
and be limited to less than 10V. To request the Positive logic
version, add the suffix (P) to the standard part number. The
ON/OFF pin has a built-in pull-up resistor of approximately
100kΩ to +5V.
Output Over Voltage Protection
The output voltage is constantly monitored by the
microprocessor with a redundant secondary-side
measurement circuit that both shuts down the duty cycle and
triggers the microprocessor to shut down. If the output voltage
exceeds the over voltage specification, the microprocessor
will latch the converter off. To turn the converter on required
either cycling the ON/OFF pin or power to the converter. This
advanced feature prevents the converter from damaging the
load if there is a converter failure or application error. If non-
latching is required, consult factory.
• An advanced microcontroller reduces parts count while
adding features, performance and flexibility in the design.
• Low common-mode noise results from lower capacitance
in the transformer from balanced winding design.
Under Voltage Hysteresis
6
5
4
3
2
1
0
30 34 37
Input Voltage (V)
Output Voltage (V)
3632 33 3531
Over Voltage Hysteresis
6
5
4
3
2
1
0
76.5 78.5 80.5
Input Voltage (V)
Output Voltage (V)
79.577.5 78 807977
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
©2006 Bel Fuse Inc. Specifications subject to change without notice. 11.06
POWER PRODUCTS
PISCES II DC/DC CONVERTERS
G2PW2V560
48V Input – 2.5VDC – 60A Output
page 5
Protection and Control
Thermal Shutdown
The printed circuit board temperature is measured using a
semiconductor sensor. If the maximum rated temperature
is exceeded, the converter is latched off. To re-enable the
converter requires cycling the ON/OFF pin or power to the
converter. If non-latching is required, consult factory.
Control Options
As the behavior of the circuit is determined by firmware in the
microcontroller, specific requirements, such as:
• non-latching thermal protection
• custom valid input voltage range
• controlled delay from initiating an ON/OFF signal for
power sequencing
can be accomplished with no change to hardware. The
standard behavior was chosen based on system design
experience, but customers may have their own requirements.
Please contact Bel Power for any special needs.
Remote Sense
The output voltage is regulated at the point where the
sense pins connect to the power output pins. Total sense
compensation should not exceed 0.4V or 10% of Vout,
whichever is greater.
Safety
An external input fuse must always be used to meet these
safety requirements.
External Output Trimming
Trim
To trim the output voltage higher, connect the required trim
resistor from the Trim pin to the +Sense pin. To trim the output
voltage lower, connect the required trim resistor from the Trim
pin to the –Sense pin.
CoolConverter™
Trim-down
+ Sense
Trim
– Sense
Increase in Output Voltage (%)
1000
100
10
012 3 4 5 6 7 8 9 10
Trim Resistance (kΩ)
2.5V Trim-up
Decrease in Output Voltage (%)
1000
100
10
012 3 4 5 6 7 8 9 10
Trim Resistance (kΩ)
Trim-down
RTRIM-UP = 2.5 (100+∆%) _ (100+2∆%) 5.11kΩ
1.225∆% ∆%
{ }
RTRIM-DOWN = 100 _ 2 5.11kΩ
∆%
{ }
Trim-up
©2006 Bel Fuse Inc. Specifications subject to change without notice. 11.06
POWER PRODUCTS
PISCES II DC/DC CONVERTERS
G2PW2V560
48V Input – 2.5VDC – 60A Output
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
page 6
Efficiency Data
Efficiency
94
92
90
88
86
84
82
80
78
0 20 60
Output Current (A)
Efficiency (%)
36V Vin
48V Vin
75V Vin
4010 5030
Power Dissipation
25
20
15
10
5
00 20 30 40 6050
Output Current (A)
Power Dissipation (W)
36V Vin
48V Vin
75V Vin
10
Start Up
1) Vout 1V/div 4mS/div
2) Iout 10A/div
3) Enable 5V/div
CH1
CH2
CH3
Transient Response
1) Vout 500mV/div 200µS/div
2) Iout 10A/div
CH2
CH1
Line/Load Regulation
2.51
2.50
2.49
2.48
0 10 20
Output Current (A)
Output Voltage (V)
36V Vin
48V Vin
75V Vin
30 40
Setpoint Accuracy 0.3680%
Line Regulation 0.0281%
Load Regulation 0.0120%
Line & Load Regulation 0.0301%
50 60
Power Dissipation
Start Up Voltage Ripple
Transient ResponseLine/Load Regulation
1. VOUT 1V/div 4mS/div
2. IOUT 10A/div
3. Enable 5V/div
1. VOUT 20mV/div 2µS/div
10µF ext cap 2MHz BW
1. VOUT 500mV/div 200µS/div
2. IOUT 10A/div
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
©2006 Bel Fuse Inc. Specifications subject to change without notice. 11.06
POWER PRODUCTS
PISCES II DC/DC CONVERTERS
G2PW2V560
48V Input – 2.5VDC – 60A Output
page 7
Back Bias
Back Bias
1) Vout 500mV/div 10mS/div
Over Voltage Protection
1) Vout 500mV/div 2mS/div
Over-current Protection
3.0
2.5
2.0
1.5
1.0
0.5
0
71
Output Current (A)
Output Voltage (V)
73 75 77 79
Note: Over-current protection is blip-mode (aka hiccup).
36V Vin
48V Vin
75V Vin
Thermal Derating
60
50
40
30
20
10
0
0 20 30 80 90
Ambient Temperature (°C)
Output Current (A)
Open Frame:
300 LFM
200 LFM
100 LFM
10 40 7050 60
Over Current Protection
Note: Over current protection is blip-mode (aka hiccup).
Thermal Derating
Over Voltage Protection
1. VOUT 500V/div 2mS/div
1. VOUT 500V/div 10mS/div
CORPORATE
Bel Fuse Inc.
206 Van Vorst Street
Jersey City, NJ 07302
Tel 201-432-0463
Fax 201-432-9542
www.belfuse.com
FAR EAST
Bel Fuse Ltd.
8F / 8 Luk Hop Street
San Po Kong
Kowloon, Hong Kong
Tel 852-2328-5515
Fax 852-2352-3706
www.belfuse.com
EUROPE
Bel Fuse Europe Ltd.
Preston Technology Management Centre
Marsh Lane, Suite G7, Preston
Lancashire, PR1 8UD, U.K.
Tel 44-1772-556601
Fax 44-1772-888366
www.belfuse.com
©2006 Bel Fuse Inc. Specifications subject to change without notice. 11.06
POWER PRODUCTS
PISCES II DC/DC CONVERTERS
G2PW2V560
48V Input – 2.5VDC – 60A Output
page 8
SIDE VIEW
(
Surface Mount with studs
)
S
IDE VIE
W
B
O
TT
O
M VIE
W
B
A
A
A
M
OU
NTIN
G
IN
S
ER
T
M
3
X
0
.
5
4 PLA
C
E
S
.
0
7
0
2.
000
PIN T
O
PI
N
.21
0
.21
0
1.4
5
2.2
8
1.
030
.
8
1
5
PIN 1
.
5
1
5
PIN 2
.21
5
PIN
3
0
PIN 4
.21
5
PIN
8
.
8
1
5
PIN
6
.
5
1
5
0
1
.
860
0
1.
030
T
O
P VIE
W
A
A
B
A
M
OU
NTIN
G
IN
S
ER
T
M
OU
NTIN
G
IN
S
ER
T
M
3
X
0
.
5
4 PLA
C
E
S
.
0
7
0
2.
000
PIN T
O
PI
N
.21
0
.21
0
1.4
5
2.2
8
1.
030
.
8
1
5
PIN 1
.
5
1
5
PIN 2
.21
5
PIN
3
0
PIN 4
.21
5
PIN
8
.
8
1
5
PIN 7
.
665
PIN
6
.
5
1
5
.
365
0
1
.
860
0
1.
030
0
.
38
0
.
06
0
.
38
0
.2
0
0
.
0
1
0
±
0
.
008
0
.
030
Pin Function Pin Dia. (In.)
1 – Input 0.040
2 On/Off 0.040
3 + Input 0.040
4 + Output 0.060
5 + Sense 0.040
6 Trim 0.040
7 – Sense 0.040
8 – Output 0.060
Notes:
1. Mechanical tolerances
x.xxx in. = ± 0.005 in.
x.xx in = ± 0.01 in.
2. Pin material: Brass with tin/lead plating over nickel
3. Workmanship: Meets or exceeds IPC-A-610B Class II
4. "A" = 0.040" dia. pins
5. "B" = 0.060" dia. pins
6. Min. screw length for heat sink attachment
= 4.5mm + heat sink flange + locking hardware
Pin Configuration – Bottom View
Mechanical
G2PW2V560
RoHS Compliance
Complies with the European Directive 2002/95/EC, calling for the elimination of lead and other
hazardous substances from electronic products. These parts are not however compatible with
the higher temperatures associated with lead free solder processes and must be soldered using
a reflow profile with a peak temperature of no more than 240˚C.