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NON-ISOLATED DC/DC CONVERTERS
5 Vdc - 24 Vdc Input 0.9 Vdc - 3.3 Vdc/3 A Output
XRAH-03L1A0
* * * * Non-Isolated High Efficiency High Power Density Low Cost
RoHS Compliant
* * * * Remote On/Off Fixed Frequency OCP/SCP
Rev.A
UL60950-1 Recognized (UL/cUL
Description
The Bel XRAH-03L1A0 modules are a series of non-isolated, step down dc/dc converters that operate from a nominal 12 Vdc source. These converters are available in an output voltage range from 0.9 Vdc to 3.3 Vdc. 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 for 3.3 Vdc output is typically 88% at full load. Typical features include remote on/off, over current protection and short circuit protection.
Part Selection
Output Voltage 0.9 V - 3.3 V Input Voltage 5.0 V - 24 V Max. Output Current 3A Max. Output Power 10 W Typical Efficiency 88% Part Number Surface Mount SRAH-03L1A0 Part Number Vertical Mount VRAH-03L1A0
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 25 V 24 V 85 C 125 C Notes
Input Specifications
Parameter Input Voltage VO=3.3 V VO=2.5 V VO=1.8 V Vo=1.5 V Vo=1.2 V Vo=0.9 V Input Current (no load) Input Current (full load) Remote Off Input Current Input Reflected Ripple Current (pk-pk) Input Reflected Ripple Current (rms) I t Inrush Current Transient Turn on Voltage Threshold Turn off Voltage Threshold
2
Min 5V 5V 5V 5V 5V 5V 3.5 V
Typ 3 mA 200 mA 50 mA 0.05 A s 4.0 V 2
Max 24 V 24 V 18 V 15 V 12 V 9V 100 mA 3A 10 mA 0.1 A s 4.9 V
2
Notes
With simulated source impedance of 500 nH, 5 Hz to 20 MHz. Use one 100 uF/ 35 V Tantalum capacitor and one 3.3 uF/ 50 V ceramic capacitor at the input
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
5 Vdc - 24 Vdc Input 0.9 Vdc - 3.3 Vdc/3 A Output
Output Specifications
Parameter Output Voltage Set Point VO=3.3 V VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V VO=0.9 V Line Regulation VO=3.3 V VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V VO=0.9 V Load Regulation VO=3.3 V VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V VO=0.9 V Regulation Over Temperature (-40 C to +85 C) VO=3.3 V VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V VO=0.9 V Output Current Range Output DC Current Limit Short Circuit Surge Transient Ripple and Noise (rms) Ripple and Noise (pk-pk) VO=3.3 V VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V VO=0.9 V Turn on Time Overshoot at Turn on Output Capacitance Transient Response Overshoot 50% ~ 100% Max Load Settling Time Overshoot 100% ~ 50% Max Load Settling Time Overshoot 50% ~ 100% Max Load Settling Time Overshoot 100% ~ 50% Max Load Settling Time 0A 4A 0 uF 25 mV 15 mV 10 mV 10 mV 8 mV 5 mV 30 mV 25 mV 20 mV 15 mV 10 mV 8 mV 2 0.8 A s 30 mV 70 mV 70 mV 60 mV 60 mV 50 mV 50 mV 7 mS 0% 150 mV 50 uS 150 mV 50 uS 100 mV 50 uS 100 mV 50 uS 45 mV 35 mV 25 mV 20 mV 15 mV 13 mV 60 mV 45 mV 33 mV 27 mV 22 mV 16 mV 3A 8A 2 1.5 A s 50 mV 130 mV 100 mV 100 mV 100 mV 100 mV 100 mV 10 mS 3% 1200 uF 200 mV 100 uS 200 mV 100 uS 150 mV 100 uS 150 mV 100 uS Test conditions: 0-20 MHz BW, with 1 uF /16 V ceramic capacitor at the output. 10 mV 10 mV 5 mV 5 mV 5 mV 3 mV 20 mV 15 mV 10 mV 10 mV 10 mV 7.5 mV Min 3.200 V 2.425 V 1.746 V 1.470 V 1.176 V 0.882 V Typ 3.3 V 2.5 V 1.8 V 1.5V 1.2 V 0.9 V Max 3.400 V 2.575 V 1.854 V 1.530 V 1.224 V 0.918 V Notes
Test conditions: Io=50% full load.
3.3 V
Test conditions: di/dt = 0.5 A/us, with 220 uF external capacitor at the output.
0.9 V-2.5 V
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
5 Vdc - 24 Vdc Input 0.9 Vdc - 3.3 Vdc/3 A Output
General Specifications
Parameter Efficiency VO=3.3 V VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V Vo=0.9 V Switching Frequency MTBF Dimensions (surface mount) Inches (L x W x H) Millimeters (L x W x H) Dimensions (vertical) Inches (L x W x H) Millimeters (L x W x H) Weight 85% 82% 79% 77% 74% 72% 250 kHz 88% 85% 82% 80% 77% 75% 300 kHz 9,900,543 hours 360 kHz Calculated Per Bell Core SR-332 (Vin=12 V; Vo=3.3 V; IO =2.4 A; Ta = 25 C) Min Typ Max Notes
Vin=12.0V; lo=lo, max
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 4.9 g -
Control Specifications
Parameter Remote On/Off Signal Low (Unit Off) Signal High (Unit On) Min -0.3 V 2.8 V Typ Max 1V 24 V Notes
Remote on/off pin open, Unit On
Output Trim Equations
Equations for calculating the trim resistor given the desired adjusted voltage (Vadj) and the nominal output voltage of the converter (Vo) are shown below. 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.
6.928 Rtrim _ up = -1Kohm Vadj _ up -Vo
Vout Module Trim Rtrim-up GND
Note: Output voltage Vo=0.902 V when Rtrim_up is not connected.
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
5 Vdc - 24 Vdc Input 0.9 Vdc - 3.3 Vdc/3 A Output
Efficiency Data
Efficiency Curve 100.0% 90.0% Efficiency 80.0% 70.0% 60.0% 50.0% 40.0% 0.30 0.75 1.50 Output current (A) 2.25 3.00 5V 12 V 24 V
Vo=3.3 V
Efficiency Curve 100.0% 90.0% Efficiency 80.0% 70.0% 60.0% 50.0% 40.0% 0.30 0.75 1.50 Output current (A) 2.25 3.00 5V 12 V 18 V
Vo=1.8 V
Efficiency Curve 100.0% 90.0% Efficiency 80.0% 70.0% 60.0% 50.0% 40.0% 0.30 0.75 1.50 Output current (A) 2.25 3.00 5V 7V 9V
Vo=0.9 V
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
5 Vdc - 24 Vdc Input 0.9 Vdc - 3.3 Vdc/3 A Output
Thermal Derating Curve
XRAH-03L1A0
Ripple and Noise Waveforms
5 Vdc input, 0.9 V output
12 Vdc input, 1.8 V output
12 Vdc input, 3.3 V output Note: Ripple and noise at full load, with 1uF/16V ceramic cap 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
NON-ISOLATED DC/DC CONVERTERS
5 Vdc - 24 Vdc Input 0.9 Vdc - 3.3 Vdc/3 A Output
Transient Response Waveforms
50% to 100% load 5 V input, 0.9 V output
50% to 100% load 5 V input, 0.9 V output
50% to 100% load 12 V input, 1.8 V output
50% to 100% load 12 V input, 1.8 V output
50% to 100% load 12 V input, 3.3 V output
50% to 100% load 12 V input, 3.3 V output
Note: Transient Response at di/dt=0.5 A/uS, with 220 uF/10 V external cap, 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
5 Vdc - 24 Vdc Input 0.9 Vdc - 3.3 Vdc/3 A Output
Mechanical Outline
SRAH-03L1A0
Pin Connections
bel
Pin 1 2 3 4 5 6 7
Function Remote On/Off (option) Vin Ground Vout Trim (option) N/A N/A
VRAH-03L1A0
Pin Connections
bel
Pin 1 2 3 4 5
Function Remote On/Off (option) Vin Ground Vout Trim (option)
bel
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.
(c)2007 Bel Fuse Inc. Specifications subject to change without notice. 010807
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

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