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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
NON-ISOLATED DC/DC CONVERTER
9.0 V - 32 V Input
10 V - 12 V/3.5 A Output
Non-Isolated
Remote
Sense
Fixed Frequency (340 kHz)
Low
Profile
Package
(8.5mm)
Over
Current
Protection
Remote On/Off (Active Low)
SCP
Description
The SRDB-04HX20 is part of the low cost non-isolated dc/dc converter. The module uses a DIP package for
ease of layout and space savings, with a low profile of 8.5 mm. The output is closely regulated and the efficiency
of 12 V is typically 86% at full load. Features include remote sense, over current protection and remote on/off.
Part Selection
Output
Voltage
Input
Voltage
Max. Output
Current
Max. Output
Power
Typical
Efficiency
Model Number
10 V - 12 V
9.0 V - 32 V
3.5 A
42 W
86%
SRDB-04HX20
Note:
Add "R" suffix at the end of the model number to indicate "Reel Packaging", and "G" for "Tray
Packaging".
Absolute Maximum Ratings
Parameter
Min
Typ
Max
Notes
Input Voltage (continuous)
-0.3 V
-
36 V
Output Enable Voltage
-0.3 V
-
12 V
Ambient Temperature
-40
C
-
85
C
Storage Temperature
-55
C
-
125
C
Input Specifications
Parameter
Min
Typ
Max
Notes
Input Voltage
9 V
20 V
32 V
Input Current (Full load)
-
-
5.6 A
Input Current (No load)
-
50 mA
100 mA
Remote Off Input Current
-
1 mA
3 mA
Input Reflected Ripple Current
(pk-pk)
-
500 mA
750 mA
Input Reflected Ripple Current
(rms)
-
170 mA
250 mA
Tested with simulated source
impedance of 500 nH, 5 Hz to 20 MHz;
and two 100 uF/50 V electrolytic
capacitors and a 3.3 uF/50 V ceramic
capacitor at the input.
I
2
t Inrush Current Transient
-
0.05 A
2
s 0.1
A
2
s
Turn-on Voltage Threshold
-
8.5 V
9.0 V
Note:
All specifications are typical at 25
C unless otherwise stated.
SRDB-04HX20 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 CONVERTER
9.0 V - 32 V Input
10 V - 12 V/3.5 A Output
Output Specifications
Parameter
Min
Typ
Max
Notes
Output Voltage Set Point
11.89 V
12.13 V
12.37 V
Vin=20 V, lout=50% full load
Line Regulation
-
12 mV
24 mV
Load Regulation
-
12 mV
24 mV
Regulation Over Temperature
(-40
C to 85 C)
-
30 mV
50 mV
Ripple and Noise (rms)
-
2.5 mV
5 mV
Ripple and Noise (pk-pk)
-
10 mV
20 mV
Test conditions:
0-20 MHz BW; with 33 uF-0.5 uH-33 uF
second stage filter.
Output Current
0 A
-
3.5 A
Output Current Limit Threshold
4 A
-
7 A
Short Circuit Surge Transient
-
0.2 A
2
s 0.5
A
2
s
Turn on Time
-
3.5 mS
10 mS
Overshoot at Turn on
-
2%
5%
Output Capacitance
0 uF
220 uF
Transient Response
Overshoot -
220
mV
250
mV
50% ~ 100%
Max Load
Settling Time
-
300 uS
500 uS
Overshoot -
130
mV
250
mV
100% ~ 50%
Max Load
Settling Time
- 300
uS
500 uS
Tested at di/dt=0.5 A/us,
Vin=20 V, with 33uF-0.5
uH-33 uF second stage
filter.
Note:
All specifications are typical at 20 V input, full load at 25 C unless otherwise stated.
General Specifications
Parameter
Min
Typ
Max
Notes
Efficiency
83%
86%
-
Vin=20 V, full load
Switching Frequency
310 kHz
340 kHz
370 kHz
Output Voltage Trim Range
80%Vo
-
105%Vo
Remote Sense Compensation
-
-
5%
MTBF
5,373,282 hours
Calculated Per Bell Core SR-332 (I
O
=
2 A, Vo=12 V, Vin=20 V; T
a
= 25
C)
Dimensions
Inches
millimeters
1.22 x 0.827 x 0.345
30.99 x 21.00 x 8.76
Weight -
11
g
-
Note
: All specifications are typical at nominal input, full load at 25
C unless otherwise stated.
Control Specifications
Parameter
Min
Typ
Max
Notes
Remote On/Off
Signal Low (Unit On)
-0.3 V
-
1 V
Signal High (Unit Off)
2.8 V
-
12 V
Remote on/off pin open, unit on.
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 CONVERTER
9.0 V - 32 V Input
10 V - 12 V/3.5 A Output
Output Trim Equations
Equations for calculating the trim resistor (in k) given the desired adjusted voltage (Vadj) and the nominal
output voltage of the converter (Vnom) are shown below. The Trim Down resistor should be connected between
the Trim pin and Vout. The Trim Up resistor should be connected between the Trim pin and Ground. Only one of
the resistors should be used for any given application.
66
.
8
408
.
83
-
-
=
adj
nom
trimdown
V
V
R
nom
adj
trimup
V
V
R
-
=
65
.
21
Note:
The output voltage V
nom
= 12.13V.
Efficiency Data
Efficiency Curve
70.0%
72.0%
74.0%
76.0%
78.0%
80.0%
82.0%
84.0%
86.0%
88.0%
90.0%
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Output Current (A)
E
f
f
i
ci
en
cy
9.0 V
20.0 V
32.0 V
Module
Vout
Trim
GND
Rtrimup
Module
Vout
Trim
GND
Rtrimdown
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 CONVERTER
9.0 V - 32 V Input
10 V - 12 V/3.5 A Output
Thermal Derating Curve
Note
: Derating curve is for 12 V output and tested at nominal input voltage.
2005 Bel Fuse Inc. Specifications subject to change without notice. 112205
CORPORATE FAR
EAST
EUROPE
Bel Fuse Inc.
Bel Fuse Ltd.
Bel Fuse Europe Ltd.
206 Van Vorst Street
8F/ 8 Luk Hop Street
Preston Technology Management Centre
Jersey City, NJ 07302
San Po Kong
Marsh Lane, Suite G7, Preston
Tel 201-432-0463
Kowloon, Hong Kong
Lancashire, PR1 8UD, U.K.
Fax 201-432-9542
Tel 852-2328-5515
Tel 44-1772-556601
www.belfuse.com
Fax 852-2352-3706
Fax 44-1772-888366
www.belfuse.com
www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
9.0 V - 32 V Input
10 V - 12 V/3.5 A Output
Mechanical Outline
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 240 C.
Pin Connections
Pin
Function
1 Trim
2 Remote
On/Off
3 Remote
Sense
4 Vo
5 Vo
6 Vo
7 Ground
8 Ground
9 Ground
10
N/A (Leave this
pin unconnected)
11 Vin
12 Vin
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