48V Input – 1.2VDC – 60A Output
PISCES II DC/DC CONVERTERS
POWER PRODUCTS
G2PW1V260
G2PW1V260 –
1
/
4
Brick Pisces II Series
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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
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Uses patented power supply control and architecture
Microprocessor controlled
Primary-side enable, choice of logic
Typical Characteristics
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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:
(All options)
Protection Features
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Over temperature protection
Over voltage protection
Over current protection
Over/Under input voltage protection
Ordering Information
Standard Model Number
G2PW1V260*
* Options:
P
= Positive Logic Version;
High = On
Input Voltage
48V
Output Voltage
1.2V
Max Current
60A
R
= Heat Sink Ready
T
= Tuned model**
G2PW1V260 P SRT 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
** 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.
Specifications subject to change without notice. 11.06
E
= 0.18" Pins (± .01")
M
= 0.145" Pins (± .01")
S
= 0.12" Pins (± .01")
Pisces II Heat Sink
Part Numbers
Part
Number
001
002
003
004
005
Height
0.25"
0.50"
1.00"
0.13"
0.70"
Typical Thermal Performance
Natural Convection
Power Dissipation
†
5W
7W
11W
TBD
TBD
‡ @ 300'/min.
©2006 Bel Fuse Inc.
Forced Convection
Thermal Resistance
‡
5.8
˚
C/W
3.2
˚
C/W
2.0
˚
C/W
TBD
TBD
† @ 60
˚
C rise heat sink to ambient
Bel Power Inc.
155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
page 1
POWER PRODUCTS
G2PW1V260
48V Input – 1.2VDC – 60A Output
PISCES II DC/DC CONVERTERS
Input Specifications
Parameter
Operating Input Voltage
Input Current
Input Capacitance
Input Hysteresis, Low Line
4
2
Min
36
Typical
48
Max
75
6
Units
V
DC
A
µF
V
DC
VIN = 48V
DC
, T
A
@25˚ C, 300 LFM Airflow, V
OUT
= 1.2V
DC
, I
OUT
= Full load unless otherwise noted.
Available output power depends on ambient temperature and good thermal management.
(See application graphs for limits.)
Output Specifications
Parameter
Regulation Over Line, Load & Temperature
Voltage Ripple
Voltage Ripple, 20MHz BW
Current Range
Current Limit Inception
Short Circuit Current, Peak
1
Output Transient Response, 50% to 75% Load Change, 1A/µsec
Settling Time to ± 1%
Turn-on Time to 98% Vnom
Output Overshoot at Turn-on
Trim Range
Over Voltage Protection, Latching
70
130
0
110
0
103
Min
98
Typical
Max
102
25
85
60
140
90
5
200
35
Units
%V
NOM
mV
RMS
mV
P–P
A
%I
OUT
A
%V
OUT
µS
mS
%V
OUT
%V
OUT
%V
OUT
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
48V Input – 1.2VDC – 60A Output
PISCES II DC/DC CONVERTERS
POWER PRODUCTS
G2PW1V260
Isolation Specifications
Parameter
Isolation Test Voltage, Input/Output (Basic)
Isolation Test Voltage, Input/Case
Isolation Test Voltage, Output Case
Isolation Resistance
Min
2250
2000
500
10
Typical
Max
Units
V
DC
V
DC
V
DC
MΩ
Features
Parameter
Over Temperature Protection, Thermal Sensor, Latching
2
Switching Frequency, Fixed
2. PCB less than 130˚ C.
250
Min
Typical
Max
110
Units
˚
C
kHz
General Specifications
Operating Temperature
Storge Temperature
Relative Humidity
Vibration
Material Flammability
Weight
MTBF Telcordia (Bellcore)
-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
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
Bel Power Inc.
155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
page 3
POWER PRODUCTS
G2PW1V260
48V Input – 1.2VDC – 60A Output
PISCES II DC/DC CONVERTERS
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.
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•
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
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.
Output Voltage (V)
Over Voltage Hysteresis
6
5
4
3
2
1
0
76.5
Output Voltage (V)
77
77.5
78
78.5
79
79.5
80
80.5
Input Voltage (V)
Under Voltage Hysteresis
6
5
4
3
2
1
0
30
31
32
33
34
35
36
37
Input Voltage (V)
©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 4
48V Input – 1.2VDC – 60A Output
PISCES II DC/DC CONVERTERS
POWER PRODUCTS
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.
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-down
R
TRIM-DOWN
=
Trim-up
R
TRIM-UP
=
{
1.2 (100+∆%) _
0.62∆%
(100+2∆%)
∆%
}
5.11kΩ
1.2V Trim-up
1000
Trim Resistance (kΩ)
100
10
0
1
2
3
4
5
6
7
8
9
10
Increase in Output Voltage (%)
{
100 _ 2
∆%
}
5.11kΩ
+ Sense
Trim Resistance (kΩ)
Trim-down
1000
Trim
100
– Sense
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.
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
