Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
12V Input
0.9V-5.0V/20A Output
Non-Isolated
Wide
Trim
Range
Fixed Frequency (275KHz)
Converter Can Sink and Source
High
Efficiency
Current
High Power Density
OCP/SCP
Power Good Output Signal (open
collector)
Under-Voltage
Lockout
(UVLO)
Remote
On/Off
Low
Cost
Description
The Bel x7PF-20A1A0 is a new high density open frame non-isolated converter series for space sensitive
applications. Each model has a wide input range (10.2V-13.8V) and offers a wide range of output voltage (0.9V
- 5.0V) with a 20A load. An external resistor adjusts the output voltage from its pre-set value of 0.9V to any
value up to the 5.0V maximum. Typical efficiency is 92% at Vo=5V, Vin=12V at full load. Typical features
include remote on/off, under-voltage lockout, over-current protection and short circuit protection.
Part Selection
Output
Voltage
Input
Voltage
Max. Output
Current
Max. Output
Power
Typical
Efficiency
Model Number
Vertical Mount
Model Number
Horizontal Mount
0.9V 5.0V
12V
20A
100W 92%
V7PF-20A1A0
07PF-20A1A0
Note
: Add "G" suffix at the end of the model number to indicate Tray Packaging.
Absolute Maximum Ratings
Parameter
Min
Typ
Max
Notes
Input Voltage (continuous)
-0.3V
-
13.8V
Output Enable Terminal Voltage
-0.3V
-
13.8V
Ambient Temperature
0
C
-
80
C
Storage Temperature
-40
C
-
125
C
Input Specifications
Parameter
Min
Typ
Max
Notes
Input Voltage
10.2V
-
13.8V
Input Current (Source)
Vo=5.0V
Vo=2.5V
Vo=0.9V
-
-
-
9.1A
4.9A
2.2A
-
-
-
Input Current (Sink)
Vo=2.5V
Vo=0.9V
-
-
-3.44A
-0.97 A
-
-
Able to sink 20A output current at any
output voltage up to and including 2.5V.
Input Current (No Load)
-
95mA
-
Remote Off Input Current
-
5mA
10mA
x7PF-20A1A0
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
12V Input
0.9V-5.0V/20A Output
Input Specifications (continued)
Parameter
Min
Typ
Max
Notes
Input Reflected Ripple Current (pk-pk)
Vo=5.0V
Vo=3.3V
Vo=2.5V
Vo=0.9V
-
-
-
280mA
250mA
200mA
150mA
350mA
320mA
280mA
250mA
Input Reflected Ripple Current (RMS)
Vo=5.0V
Vo=3.3V
Vo=2.5V
Vo=0.9V
-
-
-
80mA
70mA
45mA
40mA
120mA
100mA
80mA
60mA
Tested with simulated source
impedance of 1.5uH 5Hz to 20MHz,
and 2
270uF/16V Oscon capacitors
(ESR 20 m) at the input
External Input Capacitance
-
540uF
-
Turn-on Voltage Threshold
8.5V
9.0V
9.5V
Turn-off Voltage Threshold
7.0V
7.6V
8.3V
Note
: All specifications are typical at 25
C
unless otherwise stated.
Output Specifications
Parameter
Min
Typ
Max
Notes
Output Voltage Set Point
-2.5%Vo,set
-
2.5%Vo,set
Vin=12V, lo=lomax, full load
Output Voltage Set Point
-3.5%Vo,set
-
3.5%Vo,set
Over all operating input voltage, resistive
load, and temperature conditions
Load Regulation
Vo=5.0V
Vo=3.3V
Vo=2.5V
Vo=0.9V
-
-
-
-
-
-
-
-
0.4%Vo,set
0.4%Vo,set
0.5%Vo,set
1%Vo,set
Io=Iomin to Iomax
Line Regulation
-
-
0.5%Vo,set
Vin=Vinmin to Vinmax
Output Ripple and Noise (pk-pk)
Vo=5.0V
Vo=3.3V
Vo=2.5V
Vo=0.9V
-
-
-
-
65mV
60mV
55mV
45mV
80mV
75mV
70mV
55mV
Tested at 0-20MHz BW, with a
680uF/6.3V Oscon capacitor (ESR 12
m), 10uF/16V Tantalum capacitor, and
10nF ceramic capacitor at the output.
Output Ripple and Noise (RMS)
Vo=5.0V
Vo=3.3V
Vo=2.5V
Vo=0.9V
-
-
-
-
18mV
15mV
15mV
10mV
25mV
25mV
20mV
15mV
Output Current
0A - 20A
Current Limit Threshold
25A - 40A
Short Circuit Surge Transient
-
-
0.1A
2
s
Turn on Time
-
5mS
10mS
Overshoot at Turn on
-
0%Vo
3%Vo
Output Capacitance
Vo=5.0V
Vo=2.5V
Vo=0.9V
680uF
680uF
680uF
-
-
-
5080uF
7840uF
11000uF
Transient Response
50% ~ 75% Max Load
-
100mV
150mV
Settling Time
-
40uS
80uS
75% ~ 50% Max Load
-
100mV
150mV
Settling Time
V
O
=0.9V-
5.0V
-
40uS
80uS
Test conditions:
di/dt=2.5A/uS; Vin=12V; with a 680uF/6.3V
Oscon capacitor (ESR 12m),10uF/16V
Tantalum capacitor, and 10nF ceramic
capacitor at the output.
Note
: All specifications are typical at nominal input, full load at 25
C
unless otherwise stated.
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
12V Input
0.9V-5.0V/20A Output
General Specifications
Parameter
Min
Typ
Max
Notes
Efficiency (Current Source)
Vo=5.0V
Vo=3.3V
Vo=2.5V
Vo=0.9V
89%
86%
83%
65%
92%
89%
86%
69%
-
-
-
-
Efficiency (Current Sink)
Vo=2.5V
Vo=0.9V
79%
60%
82%
63%
-
-
Measured at Vin=12V, full load.
Switching Frequency
240KHz
275KHz
310KHz
Output Voltage Trim Range
0.9V
-
5.0V
Vo=0.9V when the Trim pin is open.
MTBF
5,570,000 hours
Calculated Per Bell Core TR-332 (I
O
=
Nominal; T
a
= 25
C)
Dimensions
Inches (L W H)
Millimeters (L W H)
1.2 x 1.1 x 0.457
30.48 x 27.94 x 11.6
V7PF-20A1A0
Dimensions
Inches (L W H)
Millimeters (L W H)
1.2 x 1.1 x 0.508
30.48 x 27.94 x 12.91
07PF-20A1A0
Weight -
15g
-
Note
: All specifications are typical at 25
C
unless otherwise stated.
Control Specifications
Parameter
Min
Typ
Max
Notes
Remote On/Off
Signal Low (Unit Off)
-0.3V
-
0.8V
Signal High (Unit On)
2.4V
-
13.8V
Remote On/Off pin open, unit on.
Power Good
Power Good Delay
1
-
-
8mS
Note
: All specifications are typical at 25
C
unless otherwise stated.
1. the power good signal is an open collector output. When the output of the module reaches 90% of the
nominal set point, the power good pin is set high.
Output Trim Equations
Equation for calculating the trim resistor (in k) given the desired adjusted voltage (Vadj) is shown below. The
Trim Up resistor should be connected between the Trim pin and Ground. Trim values should not be less than
280.
9
.
0
17
.
1
-
=
adj
trim
V
R
Equation for calculating the trim voltage (in V) given the desired adjusted voltage (Vadj) is shown below. The
Trim Up voltage should be connected between the Trim pin and Ground.
)
9
.
0
(
17
.
1
)
17
.
1
3
.
1
(
-
-
-
=
adj
V
Rs
Vt
Rs
Rt
Rtrim
Module
Vout
GND
Trim
Vt
Module
Vout
GND
Trim
Rt
Rs
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
12V Input
0.9V-5.0V/20A Output
Efficiency Data
5.0V Vout(SOURCE)
78.0%
81.0%
84.0%
87.0%
90.0%
93.0%
2.0
5.0
10.0
15.0
20.0
Output Current (A)
E
f
f
i
ci
en
cy
10.2V
12.0V
13.8V
2.5V Vout(SOURCE)
73.0%
76.0%
79.0%
82.0%
85.0%
88.0%
91.0%
2.0
5.0
10.0
15.0
20.0
Output Current (A)
E
ffi
c
i
e
n
c
y
10.2V
12.0V
13.8V
0.9V Vout(SOURCE)
50.0%
55.0%
60.0%
65.0%
70.0%
75.0%
80.0%
85.0%
2.0
5.0
10.0
15.0
20.0
Output Current (A)
E
f
f
i
ci
en
c
y
10.2V
12.0V
13.8V
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
12V Input
0.9V-5.0V/20A Output
Thermal Derating Curves
Vo=5V; Vin=12V
Vo=2.5V; Vin=12V
Vo=0.9V; Vin=12V
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