NON-ISOLATED DC/DC CONVERTERS
3.0 Vdc - 5.5 Vdc Input
12 Vdc/0.8 A & 15 Vdc/0.6 A Output
xRAH-01FXx0 Series
•
•
•
•
Non-Isolated
Fixed Frequency (550 kHz)
High Efficiency
Low Profile Package
RoHS Compliant
•
•
•
Rev.A
Trim Function (option)
Allows Burst Mode Operation
at Low Load Currents
UL60950-1 Recognized (UL/cUL)
Description
The Bel xRAH-01FXx0 is part of the low cost non-isolated dc/dc converter series. The modules use a surface
mount package or vertical package for ease of layout and space savings. The output is closely regulated and the
efficiency of 12 Vdc output module is typically 88% at full load. Typical features include burst mode operation at
light load and trim function (option).
Part Selection
Output
Voltage
12 Vdc
15 Vdc
Input Voltage
3.0 Vdc - 5.5 Vdc
3.0 Vdc - 5.5 Vdc
Max. Output
Current
0.8 A
0.6 A
Max. Output
Power
9.6 W
9.0 W
Typical
Efficiency
88%
88%
Part Number
Surface Mount
SRAH-01FX20
SRAH-01FX50
Part Number
Vertical Mount
VRAH-01FX20
VRAH-01FX50
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)
Ambient Temperature
Storage Temperature
Min
2.8 V
-40
°C
-40
°C
Typ
-
-
-
Max
6V
85
°C
125
°C
Notes
Input Specifications
Parameter
Input Voltage
Input Current (full load)
V
O
=12 V
V
O
=15 V
Input Reflected Ripple Current (pk-pk)
Input Reflected Ripple Current (rms)
I t Inrush Current Transient
Turn-on Voltage Threshold
2
Min
3V
-
-
-
-
-
-
Typ
-
-
-
100 mA
30 mA
0.02 A s
2.8 V
2
Max
5.5 V
4.3 A
4.0 A
150 mA
60 mA
0.05 A s
2.9 V
2
Notes
With simulated source impedance
of 500 nH, 5 Hz to 20 MHz; Use
270 uF/16 V Oscon capacitor with
ESR = 0.018 ohm max. at 100 kHz
Note:
All specifications are typical 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
3.0 Vdc - 5.5 Vdc Input
12 Vdc/0.8 A & 15 Vdc/0.6 A Output
Output Specifications
Parameter
Output Voltage Set Point
V
O
=12 V
V
O
=15 V
Line Regulation
V
O
=12 V
V
O
=15 V
Load Regulation
V
O
=12 V
V
O
=15 V
Regulation Over Temperature
(-40
°C
to +85
°C)
V
O
=12 V
V
O
=15 V
Output Current
V
O
=12 V
V
O
=15 V
Ripple and Noise (rms)
V
O
=12 V; I
O
=0 A
V
O
=15 V; I
O
=0 A
V
O
=12 V; I
O
=0.8 A
V
O
=15 V; I
O
=0.6 A
Ripple and Noise (pk-pk)
V
O
=12 V; I
O
=0 A
V
O
=15 V; I
O
=0 A
V
O
=12 V; I
O
=0.8 A
V
O
=15 V; I
O
=0.6 A
Rise Time
Overshoot at Turn on
Output Capacitance
-
-
-
-
-
-
33 uF
20 mV
20 mV
60 mV
80 mV
5 mS
0%
-
40 mV
40 mV
100 mV
120 mV
-
5%
330 uF
The min output
capacitance is 33 uF
Tantalum capacitor at the
output
-
-
-
-
5 mV
5 mV
20 mV
30 mV
10 mV
10 mV
40 mV
50 mV
Test conditions:
BW = 0-20 MHz; 1uF
ceramic cap and 33 uF
Tantalum capacitor at the
output.
0A
0A
-
-
0.8 A
0.6 A
-
-
60 mV
75 mV
120 mV
150 mV
-
-
20 mV
20 mV
40 mV
40 mV
11.580 V
14.475 V
12 V
15 V
12.420 V
15.525 V
Min
Typ
Max
Notes
Test condition:
Vin=5 V, lout=full load
-
-
45 mV
60 mV
80 mV
100 mV
Transient Response
50% ~ 100%
Max Load
100% ~ 50%
Max Load
Overshoot
Settling Time
Overshoot
Settling Time
All
Outputs
-
-
-
-
130 mV
100 uS
130 mV
100 uS
200 mV
200 uS
200 mV
200 uS
di/dt = 0.1 A/uS; Vin = 5 V;
and with 33 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
3.0 Vdc - 5.5 Vdc Input
12 Vdc/0.8 A & 15 Vdc/0.6 A Output
General Specifications
Parameter
Efficiency
V
O
=12 V
V
O
=15 V
Switching Frequency
Output Trim Range
MTBF
Dimensions (surface mount)
Inches (L
×
W
×
H)
Millimeters (L
×
W
×
H)
Dimensions (vertical)
Inches (L
×
W
×
H)
Millimeters (L
×
W
×
H)
Weight
-
84%
84%
500 kHz
90% V
O
88%
88%
550 kHz
-
13,684,605 hours
-
-
650 kHz
110% V
O
Calculated Per Bell Core SR-332 (Vin=
5 V; Vo=12 V; I
O
= 0.64 A; T
a
= 25
°C)
Min
Typ
Max
Notes
Measured at Vin=5 V, full load
0.78 x 0.7 x 0.32
19.81 x 17.78 x 8.13
0.7 x 0.308 x 0.65
17.78 x 7.82 x 16.51
5.2 g
-
Note:
All specifications are typical at 25
°C
unless otherwise stated.
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.
R
trim
−
down
A
=
−
B
V
nom
−
V
adj
Vout
Rtrim-down
Module
Trim
GND
R
trim
−
up
=
V
adj
C
−
D
−
V
nom
Vout
Module
Trim
Rtrim-up
GND
Vnom
12
15.055
A
164.640
209.542
B
21.850
20.600
C
11.760
11.760
D
7.150
5.900
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
3.0 Vdc - 5.5 Vdc Input
12 Vdc/0.8 A & 15 Vdc/0.6 A Output
Efficiency Data
Efficiency Curve
92.0%
90.0%
88.0%
86.0%
84.0%
82.0%
80.0%
78.0%
0.08
0.20
0.40
0.60
0.80
Output Current (A)
Efficiency Curve
95.0%
Efficiency
3.0 V
5.0 V
5.5 V
90.0%
85.0%
80.0%
75.0%
70.0%
0.06
0.15
0.30
0.45
0.60
Output Current (A)
Efficiency
3.0 V
5.0 V
5.5 V
xRAH-01FX20
xRAH-01FX50
Thermal Derating Curves
xRAH-01FX20
xRAH-01FX50
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
3.0 Vdc - 5.5 Vdc Input
12 Vdc/0.8 A & 15 Vdc/0.6 A Output
Ripple and Noise Waveforms
Ripple and noise at full load, Vin=5 V, Vo=12 V
Ripple and noise at no load, Vin=5 V, Vo=12 V
Ripple and noise at full load, Vin=5 V, Vo=15 V
Ripple and noise at no load, Vin=5 V, Vo=15 V
Note:
Ripple and noise tested with 1 uF ceramic capacitor and 33 uF tantalum capacitor at the output,
Ta=25 deg C.
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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