BEL SRAH

NON-ISOLATED DC/DC CONVERTERS
3 Vdc - 3.6 Vdc Input
12 Vdc/0.8 A & 15 Vdc/0.6 A Output
xRAH-01CXx0 Series
RoHS Compliant
Rev.A
•
Non-Isolated
•
Trim Function (option)
•
High Efficiency
•
•
Fixed Frequency (550 kHz)
Allows Burst Mode Operation
at Low Load Currents
•
Low Profile Package
•
UL60950-1 Recognized (UL/cUL)
Description
The Bel xRAH-01CXx0 is part of the low cost non-isolated dc/dc converter series. The modules use a SMD or
SIP 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 86% at full load. Typical features include allows burst mode
operation at low load currents and trim function (option).
Part Selection
Output
Voltage
Input
Voltage
Max. Output
Current
Max. Output
Power
Typical
Efficiency
Part Number
Surface Mount
Part Number
Vertical Mount
12 V
3 V - 3.6 V
0.8 A
9.6 W
86%
SRAH-01CX20
VRAH-01CX20
15 V
3 V - 3.6 V
0.6 A
9.0 W
85%
SRAH-01CX50
VRAH-01CX50
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
Min
Typ
Max
Input Voltage (continuous)
Parameter
2.8 V
-
4V
Ambient Temperature
-40 °C
-
85 °C
Storage Temperature
-40 °C
-
125 °C
Notes
Input Specifications
Parameter
Min
Typ
Max
3V
-
3.6 V
-
15 mA
-
-
-
4.3 A
4A
Input Reflected Ripple Current (pk-pk)
-
100 mA
150 mA
Input Reflected Ripple Current (rms)
-
30 mA
60 mA
I t Inrush Current Transient
-
0.02 A s
0.05 A s
Turn-on Voltage Threshold
-
2.8 V
2.9 V
Input Voltage
Input Current (no load)
Notes
Input Current (full load)
VO=12V
VO=15V
2
2
With simulated source impedance of
500 nH, 5 Hz to 20 MHz; Use 270
uF/16 V capacitor with ESR = 0.018
ohm max. at 100KHz at 25 °C
2
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 Vdc - 3.6 Vdc Input
12 Vdc/0.8 A & 15 Vdc/0.6 A Output
Output Specifications
Parameter
Min
Typ
Max
VO=12 V
VO=15 V
11.58 V
14.475 V
12 V
15 V
12.42 V
15.525 V
VO=12 V
VO=15 V
-
20 mV
20 mV
40 mV
40 mV
VO=12 V
VO=15 V
-
60 mV
75 mV
120 mV
150 mV
VO=12 V
VO=15 V
-
45 mV
60 mV
80 mV
100 mV
VO=12 V
VO=15 V
0A
0A
-
0.8 A
0.6 A
VO=12 V; IO=0 A
VO=15 V; IO=0 A
VO=12 V; IO=0.8 A
VO=15 V; IO=0.6 A
-
25 mV
25 mV
25 mV
35 mV
50 mV
50 mV
50 mV
60 mV
VO=12V; IO=0A
VO=15V; IO=0A
VO=12V; IO=0.8A
VO=15V; IO=0.6A
-
85 mV
100 mV
60 mV
100 mV
120 mV
150 mV
100 mV
150 mV
Rise Time
-
5 mS
-
Overshoot at Turn on
-
0%
5%
33 uF
-
330 uF
Output Voltage Set Point
Notes
Test condition:
Vin=3.3V, lout=full load
Line Regulation
Load Regulation
Regulation Over Temperature
(-40 °C to +85 °C)
Output Current
Ripple and Noise (rms)
Ripple and Noise (pk-pk)
Output Capacitance
Test conditions:
BW = 0-20 MHz; 1 uF Ceramic
capacitor and 33 uF Tantalum
capacitor at the output
The min output capacitance is
33 uF Tantalum capacitor at
the output
Transient Response
50% ~ 100%
Max Load
100% ~ 50%
Max Load
Overshoot
Settling Time
Overshoot
Settling Time
All
Outputs
-
130 mV
200 mV
-
100 uS
200 uS
-
130 mV
200 mV
-
100 uS
200 uS
di/dt = 0.1 A/uS; Vin = 3.3 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 Vdc - 3.6 Vdc Input
12 Vdc/0.8 A & 15 Vdc/0.6 A Output
General Specifications
Parameter
Min
Typ
Max
82%
81%
86%
85%
-
Switching Frequency
500 kHz
550 kHz
650 kHz
Output Trim Range
90% VO
-
110% VO
Notes
Efficiency
VO=12 V
VO=15 V
MTBF
Measured at Vin=3.3 V, full load
Calculated Per Bell Core SR-332
(Vin=3.3 V; Vo=12 V; IO = 0.64 A;
Ta = 25 °C)
13,296,605 hours
Dimensions (surface mount)
Inches (L × W × H)
Millimeters (L × W × H)
Dimensions (vertical)
Inches (L × W × H)
Millimeters (L × W × H)
Weight
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.
Rtrim−down
Vout
A
=
−B
Vnom − Vadj
Rtrim-down
Module
Trim
GND
Rtrim−up =
Vadj
Vout
C
−D
− Vnom
Module
Trim
Rtrim-up
GND
Vnom
A
B
C
D
12
164.640
21.850
11.760
7.150
15.055
209.542
20.600
11.760
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 Vdc - 3.6 Vdc Input
12 Vdc/0.8 A & 15 Vdc/0.6 A Output
Efficiency Data
Efficiency Curve
Efficiency Curve
86.0%
84.0%
3.0 V
3.3 V
3.6 V
Efficiency
Efficiency
88.0%
88.0%
87.0%
86.0%
85.0%
84.0%
83.0%
82.0%
81.0%
80.0%
79.0%
78.0%
0.08
3.0 V
3.3 V
3.6 V
82.0%
80.0%
78.0%
76.0%
74.0%
72.0%
70.0%
0.20
0.40
0.60
Output Current (A)
xRAH-01CX20
0.80
0.06
0.15
0.30
0.45
0.60
Output Current (A)
xRAH-01CX50
Thermal Derating Curves
xRAH-01CX20
xRAH-01CX50
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 Vdc - 3.6 Vdc Input
12 Vdc/0.8 A & 15 Vdc/0.6 A Output
Ripple and Noise Waveforms
3.3 Vdc input, 12 Vdc output
3.3 Vdc input, 15 Vdc output
Note: Ripple and noise at full load, 1 uF ceramic cap and 33 uF tantalum cap at the output, and Ta=25 deg C.
Transient Response Waveforms
50% to 100% load transient at Vin=3.3 V, Vo=12 V
100% to 50% load transient at Vin=3.3 V, Vo=12 V
50% to 100% load transient at Vin=3.3 V, Vo=15 V
100% to 50% load transient at Vin=3.3 V, Vo=15 V
Note: Transient response at di/dt=0.1 A/uS, with an external 33 uF tantalum load cap at the output,
and 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
NON-ISOLATED DC/DC CONVERTERS
3 Vdc - 3.6 Vdc Input
12 Vdc/0.8 A & 15 Vdc/0.6 A Output
Mechanical Outline
SRAH-01CXx0
Pin Connections
Pin
1
2
3
4
5
6
7
bel
Function
N/A
Vin
Ground
Vout
Trim (option)
N/A
N/A
VRAH-01CXx0
Pin Connections
bel
bel
Pin
1
2
3
4
5
Function
N/A
Vin
Ground
Vout
Trim (option)
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 ºC.
©2007 Bel Fuse Inc. Specifications subject to change without notice. 011007
CORPORATE
FAR EAST
EUROPE
Bel Fuse Inc.
206 Van Vorst Street
Jersey City, NJ 07302
Tel 201-432-0463
Fax 201-432-9542
www.belfuse.com
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
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