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. 07.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-03A
12V Input / 1.5V 5.0V Output / 3A
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
Description
The Bel SRAH-03A and VRAH-03A 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 1.5V to 5.0V. They are pack-
aged in a compact, overmolded package rated at 3A. 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, and output voltage adjust. 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-03A / VRAH-03A Series
Distributed power architectures
Data networking equipment
Telecommunications
Computers and peripherals
Part Number Selection
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RoHS Compliant
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. 07.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-03A
12V Input / 1.5V 5.0V Output / 3A
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: Input capacitance 270F/16V, ESR = 0.03
max at 100kHz @ 25 C.
1. With simulated source impedance of 500nH, 5Hz to 20MHz.
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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. 07.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-03A
12V Input / 1.5V 5.0V Output / 3A
page 3
Output Specifications
Note: All specifications are typical at nominal input, full load at 25 C unless otherwise stated.
1. Vin = 12V, Iout = full load, Ta = 25 C.
2. 0 - 20 MHz, 0.1F ceramic cap on output.
3. Overshoot at turn on output capacitance is 100F.
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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. 07.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-03A
12V Input / 1.5V 5.0V Output / 3A
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Output Specifications
Note: All specifications are typical at nominal input, full load at 25 C unless otherwise stated.
4. di/dt = 0.5A/1S, Ta = 25 C without external load capacitance.
page 4
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. 07.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-03A
12V Input / 1.5V 5.0V Output / 3A
page 5
Control Specifications
General Specifications
1. Vin=12V, full load and Ta=25 C.
2. See graphs on pages 11 - 13.
3. With remote on/off pin 1 open, the module is on.
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w
o
L
l
a
n
g
i
S
ll
A
3
.
0
-
1
V
)
n
O
t
i
n
U
(
h
g
i
H
l
a
n
g
i
S
ll
A
8
.
2
2
.
3
1
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. 07.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-03A
12V Input / 1.5V 5.0V Output / 3A
page 6
Note: On/off pin designed to work with an open collector/drain switch.
Efficiency Data
Module 5.0V
60%
70%
80%
90%
100%
0.30
0.75
1.50
2.25
3.00
Output Current
E
f
f
i
ci
e
n
cy
10.8V
12.0V
13.2V
Module 3.3V
50%
60%
70%
80%
90%
100%
0.30
0.75
1.50
2.25
3.00
Output Current
E
f
f
i
c
i
enc
y
10.8V
12.0V
13.2V
Module 2.5V
50%
60%
70%
80%
90%
100%
0.30
0.75
1.50
2.25
3.00
Output Current
E
f
f
i
c
i
enc
y
10.8V
12.0V
13.2V
Module 1.8V
40%
50%
60%
70%
80%
90%
100%
1
2
3
4
5
Output Current
E
f
fi
ci
e
n
cy
10.8V
12.0V
13.2V
Module 1.5V
40%
50%
60%
70%
80%
90%
100%
0.30
0.75
1.50
2.25
3.00
Output Current
Effi
c
i
e
n
cy
10.8V
12.0V
13.2V
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. 07.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-03A
12V Input / 1.5V 5.0V Output / 3A
page 7
Ripple and Noise
Ripple and noise at full load and 12Vdc input,
5.0Vdc output and Ta=25 C
Ripple and noise at full load and 12Vdc input,
3.3Vdc output and Ta=25 C
0.1F ceramic cap added at the output.
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
Ripple and noise at full load and 12Vdc input,
1.5Vdc 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. 07.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-03A
12V Input / 1.5V 5.0V Output / 3A
page 8
Transient Response
Transient response: di/dt = 0.5A/S, no external load capacitance
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
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
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. 07.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-03A
12V Input / 1.5V 5.0V Output / 3A
page 9
Transient Response
Transient response: di/dt = 0.5A/S, no external load capacitance
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
Vout=1.8V
50% to 100% load transients at 12V input and Ta=25 C
Vout=1.8V
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. 07.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-03A
12V Input / 1.5V 5.0V Output / 3A
page 10
Thermal Considerations
xRAH-03A150
xRAH-03A180
xRAH-03A500
Transient Response
Transient response: di/dt = 0.5A/S, no external load capacitance
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
xRAH-03A250
xRAH-03A330
Derating Curve
Output Current (A)
Output Current vs. Local Ambient
Temperature and Air Velocity
Ambient Temperature, Ta (C)
0
60
20
30
70
40
50
85
3
1
2
0
Natural Convection
200LFM
10
Derating Curve
Output Current (A)
Output Current vs. Local Ambient
Temperature and Air Velocity
Ambient Temperature, Ta (C)
0
60
20
30
70
40
50
85
3
1
2
0
Natural Convection
100LFM
200LFM
10
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. 07.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-03A
12V Input / 1.5V 5.0V Output / 3A
page 11
Output Voltage Set-Point Adjustment
Vo
Trim
Gnd
Vo
Trim
Gnd
Trim Down Test Circuit
Trim Up Test Circuit
Output Voltage Set-Point Adjustment
xRAH-03A500 Trim Resistor Calculation
Rtrim down =
23.703
Vo Vo, adj
13.87
)
Kohm
(
Rtrim up =
4.496
Vo, adj Vo
8.25
)
Kohm
(
4.5
4.55
4.6
4.65
4.7
4.75
4.8
4.85
4.9
4.95
5
0
30
60
90
120
150
180
210
240
270
300
Adjusted output voltage Vo,adj (V)
T
r
i
m
re
s
i
s
t
o
r
v
a
l
u
e
R
t
ri
m
_
d
o
w
n
(K
o
h
m
)
5
5.05
5.1
5.15
5.2
5.25
5.3
5.35
5.4
5.45
5.5
0
30
60
90
120
150
180
210
240
270
300
Adjusted output voltage Vo,adj(V)
T
r
i
m
r
e
s
i
s
t
o
r
va
l
u
e
,
R
t
r
i
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. 07.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-03A
12V Input / 1.5V 5.0V Output / 3A
page 12
xRAH-03A330 Trim Resistor Calculation
Rtrim down =
7.92
Vo Vo, adj
4.38
)
Kohm
(
Rtrim up =
2.536
Vo, adj Vo
1.21
)
Kohm
(
Output Voltage Set-Point Adjustment
xRAH-03A250 Trim Resistor Calculation
Rtrim down =
3.694
Vo Vo, adj
7.77
)
Kohm
(
Rtrim up =
1.72
Vo, adj Vo
5.62
)
Kohm
(
2.97
3
3.04
3.07
3.1
3.13
3.17
3.2
3.23
3.27
3.3
0
30
60
90
120
150
180
210
240
270
300
Adjusted output voltage Vo,adj (V)
T
r
i
m
r
e
s
i
s
t
or
v
a
l
u
e
R
t
r
i
m
_do
w
n
(
K
oh
m
)
3.3
3.33
3.37
3.4
3.43
3.46
3.5
3.53
3.56
3.6
3.63
0
30
60
90
120
150
180
210
240
270
300
Adjusted output voltage Vo,adj(V)
T
r
i
m
r
e
s
i
s
t
or
v
a
l
u
e
,
R
t
r
i
m
_up
(K
o
h
m
)
2.25
2.27
2.3
2.33
2.35
2.38
2.4
2.42
2.45
2.48
2.5
0
30
60
90
120
150
180
210
240
270
300
Adjusted output voltage Vo,adj (V)
T
r
i
m
r
e
s
i
s
t
o
r
va
l
u
e
R
t
r
i
m
_do
w
n
(
K
oh
m
)
2.5
2.52
2.55
2.58
2.6
2.63
2.65
2.67
2.7
2.73
2.75
0
30
60
90
120
150
180
210
240
270
300
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
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. 07.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-03A
12V Input / 1.5V 5.0V Output / 3A
page 13
xRAH-03A180 Trim Resistor Calculation
Rtrim down =
3.849
Vo Vo, adj
19.23
)
Kohm
(
Rtrim up =
3.064
Vo, adj Vo
15.4
)
Kohm
(
Output Voltage Set-Point Adjustment
xRAH-03A150 Trim Resistor Calculation
Rtrim down =
2.698
Vo Vo, adj
14.83
)
Kohm
(
Rtrim up =
3.064
Vo, adj Vo
11
)
Kohm
(
1.62
1.64
1.66
1.67
1.69
1.71
1.73
1.75
1.76
1.78
1.8
0
30
60
90
120
150
180
210
240
270
300
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
_
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
30
60
90
120
150
180
210
240
270
300
Adjusted output voltage Vo,adj(V)
T
r
i
m
r
e
s
i
s
t
or
v
a
lu
e
,
R
t
r
i
m
_
up
(
K
oh
m
)
1.35
1.37
1.38
1.4
1.41
1.43
1.44
1.46
1.47
1.49
1.5
0
30
60
90
120
150
180
210
240
270
300
Adjusted output voltage Vo,adj (V)
T
r
i
m
re
s
i
s
t
or va
l
u
e
R
t
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
30
60
90
120
150
180
210
240
270
300
Adjusted output voltage Vo,adj(V)
T
r
i
m
re
s
i
s
t
o
r
va
l
u
e
,
Rt
ri
m
_up
(K
o
h
m
)
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. 07.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-03A
12V Input / 1.5V 5.0V Output / 3A
page 14
Mechanical
SRAH-03A
0.400
[10.16]
0.60
[15.24]
0.70
[17.78]
0.050
[1.27]
0.100
[2.54]
4x
0.400
[10.16]
0.012
[0.30]
0.050
[1.27]
0.020
[0.51]
0.320
[8.13]
0.780
[19.81]
0.055 [1.40] 2x
0.090 [2.29] 2x
0.004 [0.10]
0-5
R0.015
[R0.38] typ
R0.008
[R0.20] typ
0.100 [2.54]
0.855
[21.72]
0.065 [1.65]
0.110
[2.79]
Suggested PCB Pad Layout
Dimensions are in inches [millimeters].
Standard dimension tolerance is 0.005 [0.13] unless otherwise noted.
1 2 3 4 5
6
7
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
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. 07.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-03A
12V Input / 1.5V 5.0V Output / 3A
page 15
Mechanical
VRAH-03A
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.
2
4
3
5
1
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
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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