Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-02A
12V Input / 0.9V 5.0V Output / 2A
Nonisolated
Compact, low profile surface mount package
Fixed frequency
High efficiency means less power dissipation
Excellent thermal performance
Optimized for cost
Remote on/off
Undervoltage lockout (UVLO)
Over current and short circuit protection
Industrial temperature range
Description
The Bel SRAH-02A and VRAH-02A modules are a series of non-isolated, step down DC/DC power converters that operate from
a nominal 12V source. These converters are available in a range of output voltages from 0.9V to 5.0V. They are packaged in a
compact, overmolded package rated at 2A. Optional lead forming provides a vertical mount product for minimal footprint or a
surface mount option for a very low profile. Standard features include remote on/off, over current and short circuit protection,
output voltage adjust and industrial temperature ranges (-40 to +85 C). The output is closely regulated and the efficiency is
typically 89% at full load. These products may be used almost anywhere low voltage silicon is employed and a 12V source is
available. Typical applications include file servers, routers, line cards and other computing and communications equipment.
Applications
page 1
SRAH-02A / VRAH-02A Series
Distributed power architectures
Data networking equipment
Part Number Selection
* F indicates fast start up.
Telecommunications
Computers and peripherals
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Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-02A
12V Input / 0.9V 5.0V Output / 2A
page 2
Input Specifications
Absolute Maximum Ratings
Note: Use beyond the maximum ratings may cause a reliability degradation of the DC/DC
converter or may permanently damage the device.
Note: 1. Use a 47uF/25V tan capacitor at the input.
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Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-02A
12V Input / 0.9V 5.0V Output / 2A
page 3
Output Specifications
Note: All specifications are typical at nominal input, full load at 25 C unless otherwise stated.
1. Vin=12V,lout=half load,Ta=25 C.
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Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-02A
12V Input / 0.9V 5.0V Output / 2A
Output Specifications
page 4
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Note: All specifications are typical at nominal input, full load at 25 C unless otherwise stated.
2. 0 - 20MHz BW with 100uF tan cap and 1uF ceramic cap.
3. For fast startup modules.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-02A
12V Input / 0.9V 5.0V Output / 2A
page 5
Output Specifications
Note: All specifications are typical at nominal input, full load at 25 C unless otherwise stated.
3. di/dt=0.1A/uS,Ta=25 C with 220uF/10V Tan cap.
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Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-02A
12V Input / 0.9V 5.0V Output / 2A
page 6
Output Specifications
Note: All specifications are typical at nominal input, full load at 25 C unless otherwise stated.
3. di/dt=0.1A/uS,Ta=25 C with 220uF/10V Tan cap.
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s
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-02A
12V Input / 0.9V 5.0V Output / 2A
page 7
Control Specifications
General Specifications
1. Efficiency is measured at Vin=12V, full load and Ta=25 C.
2. See graphs on pages 17-25.
3. With remote on/off pin 1 open, unit on.
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V
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-02A
12V Input / 0.9V 5.0V Output / 2A
page 8
Efficiency Data
MODULE 5.0V
60%
65%
70%
75%
80%
85%
90%
0.20
0.50
1.00
1.50
2.00
OUTPUT CURRENT
E
F
F
I
CI
E
NCY
10.8
12
13.2
MODULE 3.3V
55%
60%
65%
70%
75%
80%
85%
90%
95%
0.20
0.50
1.00
1.50
2.00
OUTPUT CURRENT
E
F
F
IC
IEN
C
Y
10.8
12
13.2
MODULE 2.5V
50%
60%
70%
80%
90%
100%
0.20
0.50
1.00
1.50
2.00
OUTPUT CURRENT
E
F
F
I
CI
E
N
CY
10.8
12
13.2
MODULE 1.8V
50%
55%
60%
65%
70%
75%
80%
85%
90%
0.20
0.50
1.00
1.50
2.00
OUTPUT CURRENT
EFF
I
C
I
E
N
C
Y
10.8
12
13.2
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-02A
12V Input / 0.9V 5.0V Output / 2A
Efficiency Data
page 9
MODULE 1.5V
45%
50%
55%
60%
65%
70%
75%
80%
85%
0.20
0.50
1.00
1.50
2.00
OUTPUT CURRENT
E
F
F
I
CI
E
N
CY
10.8
12
13.2
MODULE 1.2V
45%
55%
65%
75%
85%
0.20
0.50
1.00
1.50
2.00
OUTPUT CURRENT
EF
F
I
C
I
EN
C
Y
10.8
12
13.2
MODULE 0.9V
40%
50%
60%
70%
80%
0.20
0.50
1.00
1.50
2.00
OUTPUT CURRENT
E
F
F
I
CI
E
N
CY
10.8
12
13.2
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-02A
12V Input / 0.9V 5.0V Output / 2A
page 10
Ripple and Noise
Ripple and noise at full load and 12Vdc input,
2.5Vdc output and Ta=25 C
Ripple and noise at full load and 12Vdc input,
1.8Vdc output and Ta=25 C
With 100F tan cap and 1uF ceramic cap at the output.
Ripple and noise at full load and 12Vdc input,
3.3Vdc output and Ta=25 C
Ripple and noise at full load and 12Vdc input,
5.0Vdc output and Ta=25 C
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-02A
12V Input / 0.9V 5.0V Output / 2A
Ripple and Noise
Ripple and noise at full load and 12Vdc input,
0.9Vdc output and Ta=25 C
Ripple and noise at full load and 12Vdc input,
1.2Vdc output and Ta=25 C
page 11
Ripple and noise at full load and 12Vdc input,
1.5Vdc output and Ta=25 C
With 100F tan cap and 1uF ceramic cap at the output.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-02A
12V Input / 0.9V 5.0V Output / 2A
page 12
Transient Response
Transient response: di/dt = 0.1A/S, with 220F Tan capacitor.
Vout=3.3V
50% to 100% load transients at 12V input and Ta=25 C
Vout=3.3V
100% to 50% load transients at 12V input and Ta=25 C
Vout=5.0V
50% to 100% load transients at 12V input and Ta=25 C
Vout=5.0V
100% to 50% load transients at 12V input and Ta=25 C
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-02A
12V Input / 0.9V 5.0V Output / 2A
page 13
Transient Response
Vout=1.8V
100% to 50% load transients at 12V input and Ta=25 C
Vout=1.8V
50% to 100% load transients at 12V input and Ta=25 C
Vout=2.5V
50% to 100% load transients at 12V input and Ta=25 C
Vout=2.5V
100% to 50% load transients at 12V input and Ta=25 C
Transient response: di/dt = 0.1A/S, with 220F Tan capacitor..
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-02A
12V Input / 0.9V 5.0V Output / 2A
page 14
Vout=0.9V
50% to 100% load transients at 12V input and Ta=25 C
Vout=0.9V
100% to 50% load transients at 12V input and Ta=25 C
Vout=1.2V
50% to 100% load transients at 12V input and Ta=25 C
Vout=1.2V
100% to 50% load transients at 12V input and Ta=25 C
Transient Response
Vout=1.5V
50% to 100% load transients at 12V input and Ta=25 C
Vout=1.5V
100% to 50% load transients at 12V input and Ta=25 C
Transient response: di/dt = 0.1A/S, with 220F Tan capacitor..
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-02A
12V Input / 0.9V 5.0V Output / 2A
xRAH-02A1Ax
0.9 ~ 3.3V
Thermal Considerations
page 15
Vin = 12V
xRAH-02A50x
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-02A
12V Input / 0.9V 5.0V Output / 2A
page 16
Output Voltage Set-Point Adjustment
xRAH-02A1Ax Trim Resistor Calculation
Rtrim up =
3.712
Vo, adj Vo
)
Kohm
(
0.9
1.17 1.45 1.72 1.99 2.26 2.54 2.81 3.08 3.36 3.63
0
5
10
15
20
25
30
35
40
45
50
Adjusted output voltage Vo,adj(V)
T
r
i
m
r
e
s
i
s
t
or
va
l
u
e
,
R
t
r
i
m
_up(
K
o
h
m
)
50
0
Rtrimup Vadj_up
(
)
3.63
0.9
Vadj_up
Note: Output voltage Vo=0.90 3V when trim pin is not connected.
V
O
T
rim
GND
R
t
R
s
V
t
Rt (Kohm) =
Rs (4.64Vt - 3.712)
3.712 - Rs(Vout - 0.903)
)
Kohm
(
Note: Output voltage Vo=0.90 3V when trim pin is not connected.
V
O
T
rim
GND
R
down
R
up
R
set
Note: Output voltage Vo=0.90 3V when trim pin is not connected.
Rset =
3.712
Vout - 0.903
Rup =
3.712 Rset
Rset Vm up - 0.903 Rset - 3.712
Rdown =
4.64 Rset Vm down - 3.712 Rset
0.903 Rset + 3.712 - Rset Vm down
Vout is desired output voltage.
Margin up value after output voltage is set with Rset
Margin down value after output volatge is set with Rset
Vm down > 90% Vout
(
)
Kohm
)
Kohm
(
)
Kohm
(
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-02A
12V Input / 0.9V 5.0V Output / 2A
page 17
xRAH-02A090 Trim Resistor Calculation
Output Voltage Set-Point Adjustment
Vo
Trim
Gnd
Trim Up Test Circuit
0.9 0.909 0.918 0.927 0.936 0.945 0.954 0.963 0.972 0.981 0.99
0
100
200
300
400
500
600
700
800
900
1000
Adjusted output voltage Vo,adj(V)
T
r
i
m
re
s
i
s
t
or va
l
u
e
,Rt
ri
m
_up
(K
ohm
)
1000
0
Rtrimup Vadj_up
(
)
0.99
0.9
Vadj_up
Kohm
Vo
adj
Vo
up
Rtrim
-
=
,
712
.
3
_
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=0.903V
Vo,adj is the adjusted output voltage.
Rtrim-up is the resistance required between TRIM and GND.
where,
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-02A
12V Input / 0.9V 5.0V Output / 2A
page 18
Output Voltage Set-Point Adjustment
xRAH-02A120 Trim Resistor Calculation
Vo
Trim
Gnd
Vo
Trim
Gnd
Trim Down Test Circuit
Trim Up Test Circuit
Kohm
adj
Vo
Vo
down
Rtrim
-
-
=
64
.
4
,
87
.
1
_
Kohm
Vo
adj
Vo
up
Rtrim
-
=
,
712
.
3
_
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.203V
Vo,adj is the adjusted output voltage.
Rtrim-down is the resistance required between TRIM and Vo.
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.203V
Vo,adj is the adjusted output voltage.
Rtrim-up is the resistance required between TRIM and GND.
1.08 1.09
1.1
1.12 1.13
1.14
1.15 1.16
1.18
1.19
1.2
0
10
20
30
40
50
60
70
80
90
100
Adjusted output voltage Vo,adj (V)
T
r
i
m
re
s
i
s
t
or va
l
u
e
Rt
ri
m
_dow
n(K
ohm
)
1.2
1.21
1.22
1.24
1.25
1.26
1.27
1.28
1.3
1.31
1.32
20
68
116
164
212
260
308
356
404
452
500
Adjusted output voltage Vo,adj(V)
T
r
i
m
re
s
i
s
t
or va
l
u
e
,Rt
ri
m
_up
(K
ohm
)
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-02A
12V Input / 0.9V 5.0V Output / 2A
page 19
Output Voltage Set-Point Adjustment
xRAH-02A150 Trim Resistor Calculation
Kohm
adj
Vo
Vo
down
Rtrim
-
-
=
64
.
4
,
2633
.
3
_
Kohm
Vo
adj
Vo
up
Rtrim
-
=
,
712
.
3
_
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.503V
Vo,adj is the adjusted output voltage.
Rtrim-down is the resistance required between TRIM and Vo.
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.503V
Vo,adj is the adjusted output voltage.
Rtrim-up is the resistance required between TRIM and GND.
1.35 1.37
1.38
1.4
1.41
1.43
1.44 1.46
1.47
1.49
1.5
0
50
100
150
200
250
300
350
400
450
500
Adjusted output voltage Vo,adj (V)
T
r
i
m
re
s
i
s
t
or va
l
u
e
Rt
ri
m
_dow
n(K
ohm
)
1.5
1.51
1.53
1.54
1.56
1.58
1.59
1.61
1.62
1.64
1.65
0
100
200
300
400
500
600
700
800
900
1000
Adjusted output voltage Vo,adj(V)
T
r
i
m
re
s
i
s
t
or va
l
u
e
,Rt
ri
m
_up
(K
ohm
)
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-02A
12V Input / 0.9V 5.0V Output / 2A
page 20
Output Voltage Set-Point Adjustment
xRAH-02A180 Trim Resistor Calculation
Kohm
adj
Vo
Vo
down
Rtrim
-
-
=
64
.
4
,
6538
.
4
_
Kohm
Vo
adj
Vo
up
Rtrim
-
=
,
712
.
3
_
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.803V
Vo,adj is the adjusted output voltage.
Rtrim-down is the resistance required between TRIM and Vo.
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.803V
Vo,adj is the adjusted output voltage.
Rtrim-up is the resistance required between TRIM and GND.
1.62 1.64 1.66 1.67 1.69 1.71 1.73 1.75 1.76 1.78
1.8
0
50
100
150
200
250
300
350
400
450
500
Adjusted output voltage Vo,adj (V)
T
r
i
m
re
s
i
s
t
or va
l
u
e
Rt
ri
m
_dow
n(K
ohm
)
1.8
1.82
1.84
1.85
1.87
1.89
1.91
1.93
1.94
1.96
1.98
0
50
100
150
200
250
300
350
400
450
500
Adjusted output voltage Vo,adj(V)
T
r
i
m
re
s
i
s
t
or va
l
u
e
,Rt
ri
m
_up
(K
ohm
)
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-02A
12V Input / 0.9V 5.0V Output / 2A
page 21
xRAH-02A250 Trim Resistor Calculation
Output Voltage Set-Point Adjustment
Kohm
adj
Vo
Vo
down
Rtrim
-
-
=
64
.
4
,
9117
.
7
_
Kohm
Vo
adj
Vo
up
Rtrim
-
=
,
712
.
3
_
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=2.503V
Vo,adj is the adjusted output voltage.
Rtrim-down is the resistance required between TRIM and Vo.
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=2.503V
Vo,adj is the adjusted output voltage.
Rtrim-up is the resistance required between TRIM and GND.
where,
2.25 2.27
2.3
2.33 2.35 2.38
2.4
2.42 2.45 2.48
2.5
0
50
100
150
200
250
300
350
400
450
500
Adjusted output voltage Vo,adj (V)
T
r
i
m
re
s
i
s
t
or va
l
u
e
Rt
ri
m
_dow
n(K
ohm
)
2.5
2.52
2.55
2.58
2.6
2.63
2.65
2.67
2.7
2.73
2.75
0
50
100
150
200
250
300
350
400
450
500
Adjusted output voltage Vo,adj(V)
T
r
i
m
re
s
i
s
t
or va
l
u
e
,Rt
ri
m
_up
(K
ohm
)
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-02A
12V Input / 0.9V 5.0V Output / 2A
page 22
Output Voltage Set-Point Adjustment
xRAH-02A330 Trim Resistor Calculation
Kohm
adj
Vo
Vo
down
Rtrim
-
-
=
64
.
4
,
614
.
11
_
Kohm
Vo
adj
Vo
up
Rtrim
-
=
,
712
.
3
_
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=3.303V
Vo,adj is the adjusted output voltage.
Rtrim-down is the resistance required between TRIM and Vo.
where,
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=3.303V
Vo,adj is the adjusted output voltage.
Rtrim-up is the resistance required between TRIM and GND.
2.97
3
3.04 3.07
3.1
3.13 3.17
3.2
3.23 3.27
3.3
0
50
100
150
200
250
300
350
400
450
500
Adjusted output voltage Vo,adj (V)
T
r
i
m
re
s
i
s
t
or va
l
u
e
Rt
ri
m
_dow
n(K
ohm
)
3.3
3.33
3.37
3.4
3.43
3.46
3.5
3.53
3.56
3.6
3.63
0
50
100
150
200
250
300
350
400
450
500
Adjusted output voltage Vo,adj(V)
T
r
i
m
re
s
i
s
t
or va
l
u
e
,Rt
ri
m
_up
(K
ohm
)
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-02A
12V Input / 0.9V 5.0V Output / 2A
page 23
Output Voltage Set-Point Adjustment
xRAH-02A50x Trim Resistor Calculation
Kohm
adj
Vo
Vo
down
Rtrim
-
-
=
69
.
13
,
02
.
26
_
Kohm
Vo
adj
Vo
up
Rtrim
-
-
=
5
.
7
,
952
.
4
_
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=5.003V
Vo,adj is the adjusted output voltage.
Rtrim-down is the resistance required between TRIM and Vo.
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=5.003V
Vo,adj is the adjusted output voltage.
Rtrim-up is the resistance required between TRIM and GND.
where,
4.5
4.55
4.6
4.65
4.7
4.75
4.8
4.85
4.9
4.95
5
0
50
100
150
200
250
300
350
400
450
500
Adjusted output voltage Vo,adj (V)
T
r
i
m
re
s
i
s
t
or va
l
u
e
Rt
ri
m
_dow
n(K
ohm
)
5
5.05
5.1
5.15
5.2
5.25
5.3
5.35
5.4
5.45
5.5
0
50
100
150
200
250
300
350
400
450
500
Adjusted output voltage Vo,adj(V)
T
r
i
m
re
s
i
s
t
or va
l
u
e
,Rt
ri
m
_up
(K
ohm
)
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-02A
12V Input / 0.9V 5.0V Output / 2A
page 24
Mechanical
SRAH-02A
n
i
P
n
o
i
t
c
n
u
F
1
f
f
O
/
n
O
e
t
o
m
e
R
2
n
i
V
+
3
d
n
u
o
r
G
4
o
V
+
5
m
i
r
T
6
n
o
i
t
c
e
n
n
o
C
o
N
7
n
o
i
t
c
e
n
n
o
C
o
N
0.400
[10.16]
0.60
[15.24]
0.70
[17.78]
0.137
[3.48]
0.100
[2.54]
4x
0.400
[10.16]
0.012
[0.30]
0.050 0.002
[1.27 0.05]
0.020 0.002
[0.51 0.05]
0.320
[8.13]
0.780 [19.81]
0.055
[1.40]
0.090
[2.29]
2 x 4
0.050
[1.27]
Dimensions are in inches [millimeters].
Standard dimension tolerance is 0.005 [0.13] unless otherwise noted.
1
2
3
4
5
6
7
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
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-02A
12V Input / 0.9V 5.0V Output / 2A
page 25
Mechanical
VRAH-02A
n
i
P
n
o
i
t
c
n
u
F
1
f
f
O
/
n
O
e
t
o
m
e
R
2
n
i
V
+
3
d
n
u
o
r
G
4
o
V
+
5
m
i
r
T
0.700
[17.78]
0.600
[15.24]
0.050
[1.27]
0.265
[6.73]
min
0.020
[0.51]
0.308
[7.82]
0.050 [1.27]
0.100 [2.54]
0.400 [10.16]
Dimensions are in inches [millimeters].
Standard dimension tolerance is 0.005 [0.13] unless otherwise noted.
0.137
[3.47]
2
4
3
5
1
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 240C.
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