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NON-ISOLATED DC/DC CONVERTERS
4.5 Vdc - 14 Vdc Input 0.8 Vdc - 5.5 Vdc/8 A Output
XRAH-08E Series
* * * * * Non-Isolated Fixed Frequency High Efficiency High Power Density Low Cost
RoHS Compliant
* * * * * Remote On/Off
Rev.A
Under-voltage Lockout (UVLO) OCP/SCP Wide Trim Range UL60950-1 Recognized (UL/cUL)
Description
The Bel XRAH-08Exxx modules are a series of non-isolated, step down dc/dc converters that operate from 4.5 Vdc to14 Vdc source. These converters are available in a range of output voltages from 0.8 Vdc to 5.5 Vdc. It is packaged in a compact, overmolded package rated at 8 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 5 Vdc output is typically 93% at full load.
Part Selection
Output Voltage 0.8 V - 3.63 V 4.5 V - 5.5 V Input Voltage 4.5 V - 14 V 8 V - 14 V Max. Output Current 8A 8A Max. Output Power 26.4 W 44 W Typical Efficiency 91% 93% Part Number Surface Mount SRAH-08E1A0 SRAH-08E500 Part Number Vertical Mount VRAH-08E1A0 VRAH-08E500
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 -55 C Typ Max 15 V 14 V 85 C 125 C Notes
Input Specifications
Parameter Input Voltage Vo=4.5 V-5.5 V Vo=0.9 V-3.63 V Input Current (full load) 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) Remote Off Input Current Input Reflected Ripple Current (pk-pk) Input Reflected Ripple Current (rms) 8.0 V 4.5 V 3 mA 250 mA 70 mA 14 V 14 V 5.4 A 6.7 A 5.3 A 3.2 A 3.0 A 2.8 A 2.0 A 100 mA 10 mA With simulated source impedance of 500 nH, 5 Hz to 20 MHz; use two 47 uF/16 V low ESR Tantalum capacitors. Min Typ Max Notes
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 - 14 Vdc Input 0.8 Vdc - 5.5 Vdc/8 A Output
Input Specifications (continued)
Parameter I t Inrush Current Transient
2
Min -
Typ 2 0.006 A s 4.3 V 7.6 V 4.0 V 6.2 V
Max 2 0.02 A s -
Notes XRAH-08E1A0 XRAH-08E500 XRAH-08E1A0 XRAH-08E500
Turn-on Voltage Threshold Turn-off Voltage Threshold
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) Output Current Current Limit Threshold Short Circuit Surge Transient Ripple and Noise (rms) Vo=5.0 V Vo=3.3 V-0.9 V Ripple and Noise (pk-pk) Vo=5.0 V Vo=3.3 V-0.9 V Turn on Time Overshoot at Turn on Output Capacitance 0 uF 100 mV 50 mV 8 mS 0% 150 mV 80 mV 20 mS 3% 3200 uF 30 mV 15 mV 50 mV 30 mV BW = 0-20 MHz; with a 1 uf ceramic capacitor and a 10 uF/10 V Tantalum capacitor at the output. 0A 10 A Min 4.900 V 3.234 V 2.450 V 1.764 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 10 mV 8 mV 5 mV 5 mV 4 mV 4 mV 15 mV 10 mV 8 mV 5 mV 5 mV 4 mV 4 mV 30 mV 0.2 A s
2
Max 5.100 V 3.366 V 2.550 V 1.836 V 1.530 V 1.224 V 0.918 V 25 mV 16.5 mV 12.6 mV 9 mV 9 mV 8 mV 8 mV 25 mV 16.5 mV 12.5 mV 9 mV 9 mV 8 mV 8 mV 50 mV 8A 20 A -
Notes
Test condition: Vin=12 V, lout=50% full load
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 - 14 Vdc Input 0.8 Vdc - 5.5 Vdc/8 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 200 mV 50 uS 200 mV 50 uS 120 mV 50 uS 120 mV 50 uS 300 mV 80 uS 300 mV 80 uS 180 mV 80 uS 180 mV 80 uS Min Typ Max Notes
Vo=5.0 V
Vo=3.3 V0.9 V
di/dt = 0.5 A/uS; Vin = 12 V; with a 1 uF ceramic capacitor and a 10 uF/10 V Tantalum capacitor at the output.
Note: All specifications are typical at 12 V 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 Output Trim Range Remote Sense Compensation 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 89% 87% 86% 84% 82% 81% 76% 90%VO 90%VO 93% 91% 90% 88% 86% 85% 80% 330 kHz 7,801,334 hours 403%VO 110%VO 0.2V Calculated Per Bell Core SR-332 (IO = Nominal; Ta = 25 C) x7AH-08E1A0 x7AH-08E500
1 2
Min
Typ
Max
Notes
Measured at Vin=12 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 6g -
Notes: All specifications are typical at 25 C unless otherwise stated. 1. The output voltage is 0.9 V at trim pin is open. 2. The output voltage is 5.0 V at trim pin is open.
Control Specifications
Parameter Remote On/Off Signal Low (Unit Off) Signal High (Unit On) -0.3 V 2.4 V 0.8 V 14 V Remote on/off pin open, unit on. Min Typ Max Notes
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 - 14 Vdc Input 0.8 Vdc - 5.5 Vdc/8 A Output
Output Trim Equations
1) XRAH-08E1A0 Equations for calculating the trim resistor (in k) 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
Rtrim - down
1.076 = - 5.631 Vo - Vadj
Rtrim-down Module Trim
GND
Rtrim-up
3.759 = - 0.261 Vadj - Vo
Vout Module Trim Rtrim-up GND
Note: Output voltage Vo=0.9 V when Rtrim_up is not connected.
2) XRAH-08E500 Equations for calculating the trim resistor (in k) 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
Rtrim - down
23.100 = - 5.631 Vo - Vadj
Rtrim-down Module Trim
GND
Vout
Rtrim-up
3.759 = - 0.261 Vadj - Vo
Module
Trim Rtrim-up GND
Note: Output voltage Vo=5 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
4.5 Vdc - 14 Vdc Input 0.8 Vdc - 5.5 Vdc/8 A Output
Efficiency Data
Efficiency Curve 100.0% 8.0 V 12.0 V 14.0 V
Efficiency Curve 100.0% Efficiency 95.0% 90.0% 85.0% 80.0% 75.0% 4.5 V 8.0 V 12.0 V 14.0 V
Efficiency
95.0% 90.0% 85.0% 80.0% 75.0% 0.8 2 4 6 8 Output Current (A)
0.8
2
4
6
8
Output Current (A)
Vo=5.0 V
Efficiency Curve 100.0% 95.0% 90.0% 85.0% 80.0% 75.0% 70.0% 65.0% 0.8 2 4 6 8 Output Current (A)
Vo=3.3 V
Efficiency Curve 100.0% 95.0% 90.0% 85.0% 80.0% 75.0% 70.0% 65.0% 0.8 2 4 6 8 Output Current (A)
4.5 V 8.0 V 12.0 V 14.0 V
4.5 V 8.0 V 12.0 V 14.0 V
Vo=2.5 V
Efficiency Curve 95.0% 90.0% 80.0% 75.0% 70.0% 65.0% 0.8 2 4 6 8 Output Current (A)
Efficiency 95.0% 90.0%
Efficiency
Efficiency
Vo=1.8 V
Efficiency Curve
85.0%
4.5 V 8.0 V 12.0 V 14.0 V
Efficiency
85.0% 80.0% 75.0% 70.0% 65.0% 0.8 2 4 Output Current (A) 6 8
4.5 V 8.0 V 12.0 V 14.0 V
Vo=1.5 V
Efficiency Curve 95.0% 90.0% 85.0% 80.0% 75.0% 70.0% 65.0% 60.0% 0.8 2 4 6 8 Output Current (A)
Vo=1.2 V
4.5 V 8.0 V 12.0 V 14.0 V
Efficiency
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
4.5 Vdc - 14 Vdc Input 0.8 Vdc - 5.5 Vdc/8 A Output
Thermal Derating Curves
VRAH-08E1A0
SRAH-08E1A0
VRAH-08E500
SRAH-08E500
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 - 14 Vdc Input 0.8 Vdc - 5.5 Vdc/8 A Output
Ripple and Noise Waveforms
12 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 Vdc Output Note: Ripple and noise at full load, with a 1uF ceramic cap and a 10uF tan 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
4.5 Vdc - 14 Vdc Input 0.8 Vdc - 5.5 Vdc/8 A Output
Transient Response Waveforms
50% to 100% load 12 Vdc Input 0.9 Vdc Output
100% to 50% load 12 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
4.5 Vdc - 14 Vdc Input 0.8 Vdc - 5.5 Vdc/8 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 5 Vdc Output
100% to 50% load 12 Vdc Input 5 Vdc Output
Note: Transient response at di/dt=0.5 A/uS, with a 1uF ceramic cap and a 10 uF/10 V tan 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
4.5 Vdc - 14 Vdc Input 0.8 Vdc - 5.5 Vdc/8 A Output
Mechanical Outline
SRAH-08Exxx
Pin Connections
bel
Pin 1 2 3 4 5 6 7
Function Remote On/Off (option) Vin Ground Vout Trim (option) Sense (option) N/A
VRAH-08Exxx
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. 010507
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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