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NON-ISOLATED DC/DC CONVERTERS
5 Vdc - 24 Vdc Input 0.9 Vdc - 3.3 Vdc/3 A, 5 Vdc/2 A Output
XRAH-03L2A0
* * * * 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-03L2A0 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 5 Vdc. It is packaged in a compact, overmolded package rated at 3 A (0.9 Vdc-3.3 Vdc) and 2 A (5 Vdc). 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 is typically 91% at full load. Typical features include remote on/off, over current protection and short circuit protection.
Part Selection
Output Voltage 0.9 V - 5.0 V Input Voltage 5 V - 24 V Max. Output Current 3A Max. Output Power 10 W Typical Efficiency 91% Part Number Surface Mount SRAH-03L2A0 Part Number Vertical Mount VRAH-03L2A0
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=5.0 V 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) 2 I t Inrush Current Transient Turn on Voltage Threshold Turn off Voltage Threshold Min 9V 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 24 V 18 V 15 V 12 V 9V 100 mA 2.5 A 10 mA 0.1 A s 4.9 V
2
Notes
With simulated source impedance of 500 nH, 5 Hz-20 MHz. Use one 2*47 uF/35 V Tantalum capacitor and one 3.3 uF/50 V ceramic capacitor at the output.
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, 5 Vdc/2 A Output
Output Specifications
Parameter Output Voltage Set Point VO=5.0 V 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=5.0 V 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=5.0 V 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=5.0 V 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 VO=5.0 V VO=0.9 V-3.3 V Output DC Current Limit Short Circuit Surge Transient Ripple and Noise (rms) Ripple and Noise (pk-pk) VO=5.0 V 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 240 uF 50 mV 50 mV 40 mV 40 mV 40 mV 30 mV 30 mV 7 mS 0% 100 mV 100 mV 80 mV 80 mV 80 mV 60 mV 60 mV 10 mS 3% 1200 uF 0A 0A 4A 0.8 A s 20 mV
2
Min 4.850 V 3.200 V 2.425 V 1.746 V 1.470 V 1.176 V 0.882 V -
Typ 5.0 V 3.3 V 2.5 V 1.8 V 1.5 V 1.2 V 0.9 V 15 mV 15 mV 15 mV 10 mV 10 mV 10 mV 10 mV 25 mV 25 mV 25 mV 20 mV 20 mV 10 mV 10 mV
Max 5.150 V 3.400 V 2.575 V 1.854 V 1.530 V 1.224 V 0.918 V 35 mV 35 mV 35 mV 25 mV 25 mV 25 mV 25 mV 65 mV 65 mV 50 mV 40 mV 40 mV 30 mV 30 mV
Notes
Test conditions: Io=50% full load.
-
60 mV 60 mV 50 mV 50 mV 40 mV 30 mV 30 mV
100 mV 100 mV 90 mV 90 mV 80 mV 70 mV 70 mV 2A 3A 8A 1.5 A s 50 mV Test conditions: 0-20 MHz BW, with 220 uF/ 10 V Tantalum capacitor and 22 uF/10 V ceramic capacitor at the output.
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
5 Vdc - 24 Vdc Input 0.9 Vdc - 3.3 Vdc/3 A, 5 Vdc/2 A Output
Output Specifications (continued)
Parameter Transient Response 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 0.9 V-2.5 V 3.3 V-5.5 V Min Typ 120 mV 50 uS 120 mV 50 uS 100 mV 50 uS 100 mV 50 uS Max 180 mV 100 uS 180 mV 100 uS 150 mV 100 uS 150 mV 100 uS di/dt=0.5 A/uS, with a 220 uF/10 V tantalum cap and a 22 uF/10 V ceramic cap at the output Notes
Note: All specifications are typical at nominal input, full load at 25 C unless otherwise stated.
General Specifications
Parameter Efficiency VO=5.0 V 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 12 V 12 V 12 V 12 V 12 V 8V 5V 87% 84% 82% 79% 76% 74% 71% 250 kHz 91% 88% 86% 83% 80% 78% 75% 300 kHz 360 kHz Calculated Per Bell Core SR-332 (Vin=12 V; Vo=3.3 V, IO = 2.4 A; Ta = 25 C) Vin Min Typ Max Notes
Vin=12.0 V; lo=lomax
9,900,543 hours 0.78 x 0.7 x 0.32 19.812 x 17.78 x 8.128 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) Current Sink Min -0.3 V 2.8 V -3 mA Typ Max 1V 24 V 5 mA Notes
Remote on/off pin is 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 CONVERTERS
5 Vdc - 24 Vdc Input 0.9 Vdc - 3.3 Vdc/3 A, 5 Vdc/2 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 (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.
Rtrim- up =
Vo (V) 0.902 1.2 1.5 1.8 2.5 3.3 5
6.928 -1 Vadj - Vo
Rtrim(k) Open 22.248 10.585 6.715 3.335 1.889 0.691
Module
Vout Trim Rtrim-up GND
Note: Output voltage Vo=0.902 V when Rtrim_up is not connected.
Efficiency Data
5.0V module 100.0% 90.0% 80.0% 70.0% 60.0% 50.0% 40.0% 0.2A 0.5A 1A output current 1.5A 2A
100.0% 90.0% 3.3V module
efficiency
9.0V 12.0V 24.0V
Efficiency
80.0% 70.0% 60.0% 50.0% 40.0% 0.3A 0.75A 1.5A Output current 2.25A 3A
5V 12V 24V
1.8V module 100.0% 90.0% Efficiency
0.9V module 100.0% 90.0% Efficiency
5V 12V 18V
80.0% 70.0% 60.0% 50.0% 40.0% 0.3A 0.75A 1.5A Output current 2.25A 3A
80.0% 70.0% 60.0% 50.0% 40.0% 0.3A 0.75A 1.5A Output current 2.25A 3A
5V 7V 9V
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, 5 Vdc/2 A Output
Thermal Derating Curve
XRAH-03L2A0
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, 5 Vdc/2 A Output
Ripple and Noise Waveforms
5 Vdc Input, 0.9 Vdc Output
12 Vdc Input 1.2 Vdc Output
12 Vdc Input, 1.5 Vdc Output
12 Vdc Input 1.8 Vdc Output
12 Vdc Input, 2.5 Vdc Output
12 Vdc Input 3.3 Vdc Output
12 Vdc Input, 5.0 Vdc Output Note: Ripple and noise at full load, 0-20MHz BW, 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, 5 Vdc/2 A Output
Transient Response Waveforms
50% to 100% load 5 Vdc Input 0.9 Vdc Output
100% to 50% load 5 Vdc Input 0.9 Vdc Output
50% to 100% load 12 Vdc Input 1.2 Vdc Output
100% to 50% load 12 Vdc Input 1.2 Vdc Output
50% to 100% load 12 Vdc Input 1.5 Vdc Output
100% to 50% load 12 Vdc Input 1.5 Vdc Output
50% to 100% load 12 Vdc Input 1.8 Vdc Output
100% to 50% load 12 Vdc Input 1.8 Vdc Output
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, 5 Vdc/2 A Output
Transient Response Waveforms(continued)
50% to 100% load 12 Vdc Input 2.5 Vdc Output
100% to 50% load 12 Vdc Input 2.5 Vdc Output
50% to 100% load 12 Vdc Input 3.3 Vdc Output
100% to 50% load 12 Vdc Input 3.3 Vdc Output
50% to 100% load 12 Vdc Input 1.5 Vdc Output
100% to 50% load 12 Vdc Input 1.5 Vdc Output
Note: Transient Response at di/dt=0.5 A/uS, with a 220 uF/10 V tantalum cap and a 22 uF/10 V ceramic 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
5 Vdc - 24 Vdc Input 0.9 Vdc - 3.3 Vdc/3 A, 5 Vdc/2 A Output
Mechanical Outline
SRAH-03L2A0
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-03L2A0
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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