PISCES II DC/DC CONVERTERS
POWER PRODUCTS
48V Input – 1.2VDC – 60A Output
G2PW1V260
G2PW1V260 – 1/4 Brick Pisces II Series
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•
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•
•
•
•
•
•
•
•
•
Industry standard pinout and footprint
Very low dissipation
No heat sink required for most applications
Low profile, 0.38"
High efficiency: 86% at 1.2V, 60A; 88% at 1.2V, 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
Control Functions
•
•
•
Typical Characteristics
Uses patented power supply control and architecture
Microprocessor controlled
Primary-side enable, choice of logic
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Protection Features
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Over temperature protection
Over voltage protection
Over current protection
Over/Under input voltage protection
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•
Output setpoint accuracy: ± 1%
Load regulation: ± 0.2%
Line regulation: ± 0.2%
Regulation over line, load,
and temperature: ± 2%
Low output ripple
Output trim
Example Part Number:
Ordering Information
Standard Model Number
G2PW1V260*
* Options:
P = Positive Logic Version;
High = On
Input Voltage
Output Voltage
Max Current
48V
1.2V
60A
E = 0.18" Pins (± .01")
M = 0.145" Pins (± .01")
S = 0.12" Pins (± .01")
Pisces II Heat Sink
Part Numbers
R = Heat Sink Ready
T = Tuned model**
(All options)
G2PW1V260 PS RT 0 0 X
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
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
† @ 60˚ C rise heat sink to ambient
** 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.
‡ @ 300'/min.
©2006 Bel Fuse Inc.
Specifications subject to change without notice. 11.06
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
page 1
POWER PRODUCTS
PISCES II DC/DC CONVERTERS
48V Input – 1.2VDC – 60A Output
G2PW1V260
Input Specifications
Parameter
Operating Input Voltage
Min
Typical
Max
Units
36
48
75
VDC
6
A
Input Current
Input Capacitance
4
µF
Input Hysteresis, Low Line
2
VDC
VIN = 48VDC, TA@25˚ C, 300 LFM Airflow, VOUT = 1.2VDC, IOUT = Full load unless otherwise noted.
Available output power depends on ambient temperature and good thermal management.
(See application graphs for limits.)
Output Specifications
Parameter
Min
Max
Units
102
%VNOM
Voltage Ripple
25
mV RMS
Voltage Ripple, 20MHz BW
85
mV P–P
0
60
A
103
140
%IOUT
Short Circuit Current, Peak1
90
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
Regulation Over Line, Load & Temperature
Current Range
Current Limit Inception
98
Output Overshoot at Turn-on
Trim Range
Typical
0
70
Over Voltage Protection, Latching
%VOUT
110
130
%VOUT
%VOUT
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.
©2006 Bel Fuse Inc.
Specifications subject to change without notice. 11.06
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
page 2
PISCES II DC/DC CONVERTERS
POWER PRODUCTS
48V Input – 1.2VDC – 60A Output
G2PW1V260
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
Features
Parameter
Min
Typical
Over Temperature Protection, Thermal Sensor, Latching2
Switching Frequency, Fixed
Max
Units
110
˚C
250
kHz
2. PCB less than 130˚ C.
Approvals and Standards
General Specifications
Operating Temperature
Storge Temperature
Relative Humidity
Vibration
Material Flammability
Weight
-40˚ C to + 100˚ C
-55˚ C + 125˚ C
10% to 95% RH, Non-condensing
2 to 9 Hz, 3mm disp., 9 to 200 Hz, 1g
UL V-0
35 grams
MTBF Telcordia (Bellcore)
1.6 million hours
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
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
page 3
PISCES II DC/DC CONVERTERS
POWER PRODUCTS
48V Input – 1.2VDC – 60A Output
G2PW1V260
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.
•
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.
Protection and Control
Over Voltage Hysteresis
6
Output Voltage (V)
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.
©2006 Bel Fuse Inc.
4
3
2
1
0
76.5
77
77.5
78
78.5
79
79.5
80
Under Voltage Hysteresis
6
5
4
3
2
1
0
30
31
32
33
34
35
36
Input Voltage (V)
Specifications subject to change without notice. 11.06
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
page 4
80.5
Input Voltage (V)
Output Voltage (V)
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 nonlatching is required, consult factory.
5
37
PISCES II DC/DC CONVERTERS
POWER PRODUCTS
48V Input – 1.2VDC – 60A Output
G2PW1V260
CoolConverter™
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.
Trim-up
Rtrim-UP
{
=
1.2 (100+∆%) _
0.62∆%
(100+2∆%)
∆%
}
5.11kΩ
1.2V Trim-up
Trim Resistance (kΩ)
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.
1000
100
10
0
1
2
3
4
5
6
7
8
9
10
Increase in Output Voltage (%)
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.
Trim-down
Safety
An external input fuse must always be used to meet these
safety requirements.
Rtrim-DOWN =
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.
}
5.11kΩ
1000
Trim Resistance (kΩ)
– Sense
100 _ 2
∆%
Trim-down
+ Sense
Trim
{
100
10
0
1
2
3
4
5
6
7
8
9
10
Decrease in Output Voltage (%)
©2006 Bel Fuse Inc.
Specifications subject to change without notice. 11.06
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
page 5
PISCES II DC/DC CONVERTERS
POWER PRODUCTS
48V Input – 1.2VDC – 60A Output
G2PW1V260
Power
Dissipation
Power
Dissipation
91
16
89
14
Power Dissipation (W)
Efficiency (%)
Efficiency
Data
Efficiency
87
85
83
81
36V Vin
48V Vin
75V Vin
79
77
75
0
10
20
30
40
50
60
12
10
8
6
36V Vin
48V Vin
75V Vin
4
2
0
0
10
Output Current (A)
20
30
40
50
60
Output Current (A)
Start
Up
Start Up
Voltage
Ripple
Voltage Ripple
CH2
CH3
CH1
1) Vout 10mV/div 2µS/div
1) Vout 500mV/div 4mS/div
2) Iout 10A/div
3) Enable 5V/div
1.10µF
VOUT
2µS/div
ext cap10mV/div
2MHz BW
10µF ext cap 2MHz BW
1. VOUT 500mV/div 4mS/div
2. IOUT 10A/div
3. Enable 5V/div
Line/Load
Line/Load Regulation
Regulation
Transient
TransientResponse
Response
Output Voltage (V)
1.23
Setpoint Accuracy 0.1167%
Line Regulation 0.0334%
Load Regulation 0.0292%
Line & Load Regulation 0.0459%
1.22
CH1
1.21
1.20
1.19
36V Vin
48V Vin
75V Vin
1.18
1.17
0
10
20
30
40
50
CH2
60
Output Current (A)
©2006 Bel Fuse Inc.
1) Vout 200mV/div 200µS/div
1.2) Iout
VOUT
10A/div200mV/div 200µS/div
2. IOUT 10A/div
Specifications subject to change without notice. 11.06
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
page 6
PISCES II DC/DC CONVERTERS
POWER PRODUCTS
48V Input – 1.2VDC – 60A Output
G2PW1V260
Back Bias
Over Current Protection
Back Bias
Note: Over current
protection isProtection
blip-mode (aka hiccup).
Over-current
Note: Over-current protection is blip-mode (aka hiccup).
1.4
Output Voltage (V)
1.2
1.0
0.8
0.6
36V Vin
48V Vin
75V Vin
0.4
0.2
0
65
1) Vout 200mV/div 2mS/div
1. VOUT 200mV/div 2mS/div
67
69
71
73
Output Current (A)
Over
Voltage
Protection
Over
Voltage Protection
1) Vout 500mV/div 2mS/div
1. VOUT 500mV/div 2mS/div
©2006 Bel Fuse Inc.
Specifications subject to change without notice. 11.06
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
page 7
.815
.665
.515
.365
.215
.815 PIN 1
B
A
A
PIN 8
PIN 7
PIN 6
.515 PIN 2
A
.215 PIN 3
PIN 4
0
0
TOP VIEW
MOUNTING INSERT
M3 X 0.5 4 PLACES
.210
POWER PRODUCTS
2.000
PIN TO PIN
Mechanical
0
48V Input – 1.2VDC – 60A Output
.210
.070
1.860
PISCES II DC/DC CONVERTERS
G2PW1V260
2.28
G2PW1V260
1.030
1.030
1.45
B
PIN 1 .815
A
PIN 2 .515
A
.515 PIN 6
PIN 3 .215
A
.215 PIN 4
.815 PIN 8
0
BOTTOM VIEW
.210
0
.070
2.000
PIN TO PIN
MOUNTING INSERT
M3 X 0.5 4 PLACES
1.860
.210
0
0.38
0.20
Pin Configuration – Bottom View
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
SIDE VIEW
Notes:
0.38
1. Mechanical tolerances
x.xxx in. = ± 0.005 in.
x.xx in = ±0.06
0.01 in. SIDE VIEW (Surface Mount with studs)
0.010 ±0.008
0.030
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
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.
©2006 Bel Fuse Inc.
Specifications subject to change without notice. 11.06
CORPORATE
FAR EAST
EUROPE
Bel Fuse Inc.
206 Van Vorst Street
Jersey City, NJ 07302
Tel 201-432-0463
Fax 201-432-9542
www.belfuse.com
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
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
page 8
1.45