NON-ISOLATED DC/DC CONVERTERS
4.5 Vdc - 32 Vdc Input
1.2 Vdc - 5.0 Vdc/3 A Output
xRAH-03Hxx0 Series
•
•
•
•
•
RoHS Compliant
•
•
•
•
Rev.B
Non-Isolated
High Efficiency
High Power Density
Excellent Thermal Performance
UL60950-1 Recognized (UL/cUL)
Remote On/Off
Input Under Voltage Lockout
OCP/SCP
Low Cost
Description
The Bel xRAH-03Hxx0 is part of the low cost non-isolated dc/dc power converter series. It is packaged in a
compact, overmolded package rated at 3 A. Optional lead forming provides a vertical mount product for minimal
footprint or a surface mount option for a very low profile. The output is closely regulated and the efficiency of 3.3
Vdc output is typically 90% at full load. Typical features include remote on/off, input under voltage lockout, over
current protection and short circuit protection.
Part Selection
Output
Voltage
5.0 V
3.3 V
2.5 V
1.8 V
1.5 V
1.2 V
Input Voltage
8.0 V - 32 V
4.9 V - 32 V
4.5 V - 32 V
4.5 V - 32 V
4.5 V - 32 V
4.5 V - 32 V
Max. Output
Current
3A
3A
3A
3A
3A
3A
Max. Output
Power
15 W
10 W
7.5 W
5.4 W
4.5 W
3.6 W
Typical
Efficiency
92%
90%
88%
85%
83%
81%
Part Number
Surface Mount
SRAH-03H500
SRAH-03H330
SRAH-03H250
SRAH-03H180
SRAH-03H150
SRAH-03H120
Part Number
Vertical Mount
VRAH-03H500
VRAH-03H330
VRAH-03H250
VRAH-03H180
VRAH-03H150
VRAH-03H120
Notes:
1. Add “0” suffix at the end of the model number to indicate “Tube Packaging”, and “R” for “Reel
Packaging”, and “G” for “Tray Packaging”.
2. All part numbers above indicate RoHS 6. Change the second letter "R" to "7" for RoHS 5 part numbers.
Absolute Maximum Ratings
Parameter
Input Voltage (continuous)
Output Enable Terminal Voltage
Ambient Temperature
Storage Temperature
Min
-0.3 V
-0.3 V
-40
°C
-40
°C
Typ
-
-
-
-
Max
34 V
12 V
85
°C
125
°C
Notes
Input Specifications
Parameter
Input Voltage
Input Current (no load)
Input Current (full load)
Remote Off Input Current
Input Reflected Ripple Current
(pk-pk)
Input Reflected Ripple Current
(rms)
2
I t Inrush Current Transient
Turn on Voltage Threshold
2
Turn off Voltage Threshold
1
Min
4.5 V
-
-
-
-
-
-
-
-
Typ
-
30 mA
-
4 mA
200 mA
100 mA
0.02 A s
4.1 V
3.3 V
2
Max
32 V
-
3A
-
400 mA
150 mA
0.1 A s
4.5 V
4.0 V
2
Notes
See “Part Selection” for more details.
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.
Notes:
1. The max Turn on Voltage threshold of the 3.3 V & 5.0 V output module will be relaxed to 4.9 V & 8.0 V
respectively.
2. The max Turn off Voltage threshold of the 3.3 V output module will be relaxed to 4.5 V. The 5.0 V output
module does not have such function.
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
4.5 Vdc - 32 Vdc Input
1.2 Vdc - 5.0 Vdc/3 A Output
Output Specifications
Parameter
Output Voltage Set Point
V
O
=5.0 V
V
O
=3.3 V
V
O
=2.5 V
V
O
=1.8 V
V
O
=1.5 V
Vo=1.2 V
Line Regulation
V
O
=5.0 V
V
O
=1.2 V-3.3 V
Load Regulation
V
O
=5.0 V
V
O
=1.2 V-3.3 V
Regulation Over Temperature
(-40
°C
to +85
°C)
Output Current
Current Limit Threshold
Short Circuit Surge Transient
V
O
=1.2 V-5.0 V
Ripple and Noise (rms)
V
O
=1.2 V-5.0 V
Ripple and Noise (pk-pk)
V
O
=1.2 V-5.0 V
Turn on Time
Overshoot at Turn on
Output Capacitance
Transient Response
50% ~ 100%
Max Load
100% ~ 50%
Max Load
50% ~ 100%
Max Load
100% ~ 50%
Max Load
50% ~ 100%
Max Load
100% ~ 50%
Max Load
50% ~ 100%
Max Load
100% ~ 50%
Max Load
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
V
O
=1.2 V
-1.5 V
V
O
=1.8 V
- 2.5 V
V
O
=3.3 V
V
O
=5.0 V
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
150 mV
100 uS
150 mV
100 uS
130 mV
100 uS
130 mV
100 uS
100 mV
50 uS
100 mV
50 uS
90 mV
40 uS
90 mV
40 uS
200 mV
150 uS
200 mV
150 uS
180 mV
150 uS
180 mV
150 uS
150 mV
100 uS
150 mV
100 uS
140 mV
80 uS
140 mV
80 uS
Test conditions:
di/dt = 0.5 A/uS; Vin =
12 V; with a 220 uF
Tantalum capacitor at the
output.
-
-
-
220 uF
60 mV
15 mS
2%
-
100 mV
50 mS
5%
1200uF
-
25 mV
50 mV
-
-
-
-
0A
3.3 A
-
-
Min
4.900 V
3.234 V
2.450 V
1.764 V
1.470 V
1.176 V
Typ
5.0 V
3.3 V
2.5 V
1.8 V
1.5 V
1.2 V
±10
mV
±5
mV
±10
mV
±5
mV
30 mV
-
-
0.02 A s
2
Max
5.100 V
3.366 V
2.550 V
1.836 V
1.530 V
1.224 V
±15
mV
±10
mV
±15
mV
±10
mV
50 mV
3A
9A
0.1 A s
2
Notes
Test conditions:
Vin=12 V, Io=50% full
load
Tested with 0-20 MHz BW,
with a 220 uF tantalum
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
4.5 Vdc - 32 Vdc Input
1.2 Vdc - 5.0 Vdc/3 A Output
General Specifications
Parameter
Efficiency
V
O
=5.0 V
V
O
=3.3 V
V
O
=2.5 V
V
O
=1.8 V
V
O
=1.5 V
Vo=1.2 V
Switching Frequency
Output Trim Range (narrow trim)
MTBF
Dimensions (surface mount)
Inches (L
×
W
×
H)
Millimeters (L
×
W
×
H)
Dimensions (vertical)
Inches (L
×
W
×
H)
Millimeters (L
×
W
×
H)
Weight
89%
87%
85%
82%
80%
78%
200 kHz
90%Vo
92%
90%
88%
85%
83%
81%
300 kHz
-
-
-
-
-
-
400 kHz
110%Vo
Calculated Per Bell Core SR-332 (I
O
=
Nominal; T
a
= 25
°C)
Measured at Vin=12 V, full load and
Ta=25
°C
Min
Typ
Max
Notes
8,120,000 hours
0.78 x 0.70 x 0.32
19.81 x 17.78 x 8.13
0.70 x 0.308 x 0.65
17.78 x 7.82 x 16.51
5.1 g
-
-
Control Specifications
Parameter
Remote On/Off
Signal Low (Unit On)
Signal High (Unit Off)
Min
-0.3 V
2.8 V
Typ
-
-
Max
1V
12 V
Notes
Remote on/off pin open, unit on.
Output Trim Equations
Equations for calculating the trim resistor (in kΩ) 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.
Vout
R
trimdown
A
=
−
B
V
nom
−
V
adj
Rtrim-down
Module
Trim
GND
R
trimup
=
V
adj
C
−
D
−
V
nom
A
61.850
53.840
9.556
3.849
3.102
1.794
B
29.400
61.700
15.620
13.830
14.420
10.910
Vout
Module
Trim
Rtrim-up
GND
Vnom
5.0
3.3
2.5
1.8
1.5
1.2
C
11.760
17.200
4.496
3.064
3.536
3.536
D
14.700
40.200
10.000
10.000
10.000
6.490
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
•
Tel 201-432-0463
•
Fax 201-432-9542
•
www.belfuse.com
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