Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP04x7AH-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 S7AH-02A and V7AH-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
S7AH-02A / V7AH-02A Series
Distributed power architectures
Data networking equipment
Part Number Selection
* F indicates fast start up.
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Telecommunications
Computers and peripherals
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP04x7AH-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
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP04x7AH-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
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP04x7AH-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
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP04x7AH-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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s
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP04x7AH-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
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP04x7AH-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
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP04x7AH-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
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP04x7AH-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
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP04x7AH-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
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP04x7AH-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
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP04x7AH-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
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP04x7AH-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
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP04x7AH-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
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP04x7AH-02A
12V Input / 0.9V 5.0V Output / 2A
x7AH-02A1Ax
0.9 ~ 3.3V
Thermal Considerations
page 15
Vin = 12V
x7AH-02A50x
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP04x7AH-02A
12V Input / 0.9V 5.0V Output / 2A
page 16
Output Voltage Set-Point Adjustment
x7AH-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
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP04x7AH-02A
12V Input / 0.9V 5.0V Output / 2A
page 17
x7AH-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
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP04x7AH-02A
12V Input / 0.9V 5.0V Output / 2A
page 18
Output Voltage Set-Point Adjustment
x7AH-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
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP04x7AH-02A
12V Input / 0.9V 5.0V Output / 2A
page 19
Output Voltage Set-Point Adjustment
x7AH-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
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP04x7AH-02A
12V Input / 0.9V 5.0V Output / 2A
page 20
Output Voltage Set-Point Adjustment
x7AH-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
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP04x7AH-02A
12V Input / 0.9V 5.0V Output / 2A
page 21
x7AH-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
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP04x7AH-02A
12V Input / 0.9V 5.0V Output / 2A
page 22
Output Voltage Set-Point Adjustment
x7AH-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
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP04x7AH-02A
12V Input / 0.9V 5.0V Output / 2A
page 23
Output Voltage Set-Point Adjustment
x7AH-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
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP04x7AH-02A
12V Input / 0.9V 5.0V Output / 2A
page 24
Mechanical
S7AH-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
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP04x7AH-02A
12V Input / 0.9V 5.0V Output / 2A
page 25
Mechanical
V7AH-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
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