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
12 V Input
0.9 V-5.0 V/20 A Output
Non-Isolated
Wide
Trim
Range
Fixed Frequency (275 kHz)
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 xRPF-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 (0.9 V
- 5.0 V) with a 20 A load. An external resistor adjusts the output voltage from its pre-set value of 0.9 V to any
value up to the 5.0 V maximum. Typical efficiency is 92% at Vo=5 V, Vin=12 V 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
0.9 V - 5.0 V
12 V
20 A
100 W
92%
VRPF-20A1A0
0RPF-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)
-0.3 V
-
13.8 V
Output Enable Terminal Voltage
-0.3 V
-
13.8 V
Ambient Temperature
0
C
-
80
C
Storage Temperature
-40
C
-
125
C
Input Specifications
Parameter
Min
Typ
Max
Notes
Input Voltage
10.2 V
-
13.8 V
Input Current (Source)
Vo=5.0 V
Vo=2.5 V
Vo=0.9 V
-
-
-
9.1 A
4.9 A
2.2 A
-
-
-
Input Current (Sink)
Vo=2.5 V
Vo=0.9 V
-
-
-3.44 A
-0.97 A
-
-
Able to sink 20 A output current at any
output voltage up to and including 2.5 V.
Input Current (No Load)
-
95 mA
-
Remote Off Input Current
-
5 mA
10 mA
xRPF-20A1A0
RoHS Compliant
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
12 V Input
0.9 V-5.0 V/20 A Output
Input Specifications (continued)
Parameter
Min
Typ
Max
Notes
Input Reflected Ripple Current (pk-pk)
Vo=5.0 V
Vo=3.3 V
Vo=2.5 V
Vo=0.9 V
-
-
-
280 mA
250 mA
200 mA
150 mA
350 mA
320 mA
280 mA
250 mA
Input Reflected Ripple Current (rms)
Vo=5.0 V
Vo=3.3 V
Vo=2.5 V
Vo=0.9 V
-
-
-
80 mA
70 mA
45 mA
40 mA
120 mA
100 mA
80 mA
60 mA
Tested with simulated source
impedance of 1.5 uH 5Hz to 20 MHz,
and 2
270 uF/16 V Oscon
capacitors (ESR 20 m) at the
input
External Input Capacitance
-
540 uF
-
Turn-on Voltage Threshold
8.5 V
9.0 V
9.5 V
Turn-off Voltage Threshold
7.0 V
7.6 V
8.3 V
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=12 V, 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=5.0 V
Vo=3.3 V
Vo=2.5 V
Vo=0.9 V
-
-
-
-
-
-
-
-
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=5.0 V
Vo=3.3 V
Vo=2.5 V
Vo=0.9 V
-
-
-
-
65 mV
60 mV
55 mV
45 mV
80 mV
75 mV
70 mV
55 mV
Tested at 0-20 MHz BW, with a
680 uF/6.3 V Oscon capacitor (ESR 12
m), 10uF/16V Tantalum capacitor, and
10nF ceramic capacitor at the output.
Output Ripple and Noise (rms)
Vo=5.0 V
Vo=3.3 V
Vo=2.5 V
Vo=0.9 V
-
-
-
-
18 mV
15 mV
15 mV
10 mV
25 mV
25 mV
20 mV
15 mV
Output Current
0 A
-
20 A
Current Limit Threshold
25 A
-
40 A
Short Circuit Surge Transient
-
-
0.1 A
2
s
Turn on Time
-
5 mS
10 mS
Overshoot at Turn on
-
0%Vo
3%Vo
Output Capacitance
Vo=5.0 V
Vo=2.5 V
Vo=0.9 V
680 uF
680 uF
680 uF
-
-
-
5080 uF
7840 uF
11000 uF
Transient Response
50% ~ 75% Max Load
-
100 mV
150 mV
Settling Time
-
40 uS
80 uS
75% ~ 50% Max Load
-
100 mV
150 mV
Settling Time
V
O
=0.9 V-
5.0 V
-
40 uS
80 uS
Test conditions:
di/dt=2.5 A/uS; Vin=12 V; with a 680 uF/6.3
V Oscon capacitor (ESR 12 m),
10 uF/16 V Tantalum capacitor, and 10 nF
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
12 V Input
0.9 V-5.0 V/20 A Output
General Specifications
Parameter
Min
Typ
Max
Notes
Efficiency (Current Source)
Vo=5.0 V
Vo=3.3 V
Vo=2.5 V
Vo=0.9 V
89%
86%
83%
65%
92%
89%
86%
69%
-
-
-
-
Efficiency (Current Sink)
Vo=2.5 V
Vo=0.9 V
79%
60%
82%
63%
-
-
Measured at Vin=12 V, full load.
Switching Frequency
240 kHz
275 kHz
310 kHz
Output Voltage Trim Range
0.9 V
-
5.0 V
Vo=0.9 V when the Trim pin is open.
MTBF
5,570,000 hours
Calculated Per Bell Core SR-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
VRPF-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
0RPF-20A1A0
Weight -
15
g
-
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)
-0.3 V
-
0.8 V
Signal High (Unit On)
2.4 V
-
13.8 V
Remote On/Off pin open, unit on.
Power Good
Power Good Delay
1
-
-
8
mS
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
12 V Input
0.9 V-5.0 V/20 A 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
12 V Input
0.9 V-5.0 V/20 A Output
Thermal Derating Curves
Vo=5 V; Vin=12 V
Vo=2.5 V; Vin=12 V
Vo=0.9 V; Vin=12 V
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