NON-ISOLATED DC/DC CONVERTERS

SRAH-05A / VRAH-05A Series Nonisolated Compact, low profile surface mount package Fixed frequency High efficiency means less power dissipation Excellent thermal performance Optimized for cost Remote on/off Undervoltage lockout UVLO) Over current and short circuit protection Description The Bel SRAH-05A and VRAH-05A modules are a series of non-isolated, step down DC/DC power converters that operate from a nominal 12V source. These converters are available in a range of output voltages from to. They are packaged in a compact, overmolded package rated at 5A. Optional lead forming provides a vertical mount product for minimal footprint or a surface mount option for a very low profile. Standard features include remote on/off, over current and short circuit protection, output voltage adjust and industrial temperature ranges -40 to +85 C). The output is closely regulated and the efficiency is typically 91.5% at full load. These products may be used almost anywhere low voltage silicon is employed and a 12V source is available. Typical applications include file servers, routers, line cards and other computing and communications equipment. Applications Distributed power architectures Data networking equipment Telecommunications Computers and peripherals Part Number Selection Output Voltage Input Voltage Max. Output Current Max. Output Power Typical Efficiency Part Number Surface Mount Part Number Vertical Mount 12V 5A 25W 91.5% SRAH-05A0 VRAH-05A0 12V 5A 25W 91.5% S RAH-05AF* VRAH-05AF*.V 12V 5A 16.5W 88% SRAH-05A0 VRAH-05A0 12V 5A 12.5W 86% SRAH-05A2 VRAH-05A2 12V 5A 9.0W 8% SRAH-05A1 VRAH-05A1 12V 5A 7.5W 81% SRAH-05A1 VRAH-05A1 12V 5A 6.0W 78% SRAH-05A120 VRAH-05A120 12V 5A 5.0W 76% SRAH-05A VRAH-05A 12V 5A 4.5W 7% SRAH-05A090 VRAH-05A090 0.9 ~.6V 12V 5A 18.2W 88% SRAH-05A1A0 VRAH-05A1A0 0.9 ~.6V 12V 5A 18.2W 88% S RAH-05A1AF* VRAH-05A1AF* * F indicates fast start up. page 1

NON-ISOLATED DC/DC CONVERTERS Absolute Maximum Ratings Parameter Symbol Min Typical Max Unit Continuous Input Voltage Output Enable Terminal Voltage Ambient Temperature Storage Temperature Vin -0. 15 V Vouten -0. 15 V Tamb -40 85 C tor -40 125 C Note: Use beyond the maximum ratings may cause a reliability degradation of the DC/DC converter or may permanently damage the device. Input Specifications Parameter Module Symbol Min Typical Max Units Operating Input Voltage Vin. 8 1. 2 V Input Current.V Iin 2.8 2.0 1.5 1.2 1.0 0.8 0.7 0.65 A No Load Input Current Remote Off Input Current 1 Input Reflected Ripple Current ma ma ma rms 1 Input Reflected Ripple Current P-P) 1 mapk I 2 t Inrush Current Transient 0.006 0.012 A 2 s Turn On Voltage Threshold Turn Off Voltage Threshold 9. 8 V 8. 5 9. 0 9. 6 V Note: Input capacitance one 270µF/16V, ESR = 0.018 Ω max at khz @ 25 C. 1. With simulated source impedance of 0nH, 5Hz to 20MHz. page 2

Output Specifications Parameter Module Symbol Min Typical Max Units 1 Output Voltage Set Point.V Vout 4.9.247 2.460 1.771 1.476 1.181 0.984 0.886 5. 2.5 1.8 1.5 1.2 1.0 0.9 5.1.5 2.540 1.829 1.524 1.219 1.016 0.914 V Load Regulation.V 15 8 8 5 5 5 5 4 0 20 20 15 15 15 15 15 Line Regulation.V 2 2 2 1 1 Regulation Over Temperature -40 to 85 C).V 40 40 5 20 15 6 5 70 70 70 40 0 20 12 Total Output Voltage Regulation -40 to 85 C).V 58 51 46 27 22 17 12 1 65 45 45 7 5 Note: specifications are typical at nominal input, full load at 25 C unless otherwise stated. 1. Vin = 12V, Iout = full load, Ta = 25 C. page

NON-ISOLATED DC/DC CONVERTERS Output Specifications Parameter Module Symbol Min Typical Max Units 2 Output Ripple and Noise.V 70 70 60 40 0 0 60 60 p-p 2 Output Ripple and Noise.V 0 0 0 20 20 15 15 60 60 60 40 40 0 0 20 rms Output Current Range Output DC Current Limit Iout 0 5 A Ioutlim 6 12. 5 A Short Circuit Surge.V Ioutsurge 0.9 0.60 0.70 0.85 0.85 1.05 1.1 1.1 1.8 1.2 1.4 1.7 1.7 2.1 2.2 2.2 A 2 s Turn on.v Ton 1 2 200 200 200 200 200 200 200 200 ms Turn on - Ton 20 ms Overshoot at Turn On 0 % Overshoot at Turn On 1.2 - - 0 % Output Capacitance Cout 0 2200 µ F Note: specifications are typical at nominal input, full load at 25 C unless otherwise stated. 2. 0-20MHz, 22µF/6.V X5R ceramic cap on output µf/v X5R ceramic cap for module).. For fast start up modules. page 4

Output Specifications Parameter Module Symbol Min Typical Max Units Transient Response V % to % of Max Load 1 60 V % to % of Max Load 1 60 Transient Response V % to % of Max Load 1.V V % to % of Max Load 1 Transient Response V % to % of Max Load 1 V % to % of Max Load 1 Transient Response V % to % of Max Load 1 V % to % of Max Load 1 Note: specifications are typical at nominal input, full load at 25 C unless otherwise stated.. di/dt = 0.5A/uS, Ta = 25 C. ~.V modules with 220µF/6.V Tant cap module with µf/v tant cap). page 5

NON-ISOLATED DC/DC CONVERTERS Output Specifications Parameter Module Symbol Min Typical Max Units Transient Response V % to % of Max Load 120 V % to % of Max Load 120 Transient Response V % to % of Max Load 120 V % to % of Max Load 120 Transient Response V % to % of Max Load 120 V % to % of Max Load 120 Transient Response V % to % of Max Load 120 V % to % of Max Load 120 Note: specifications are typical at nominal input, full load at 25 C unless otherwise stated.. di/dt = 0.5A/uS, Ta = 25 C. ~.V modules with 220µF/6.V Tant cap module with µf/v tant cap). page 6

General Specifications Parameter Module Symbol Min Typical Max Units 1 Efficiency.V η 89 86 84 81 79 76 74 71 91 88 86 8 81 78 76 7 % Switching Frequency ~.V Fsw 2 0 2 70 290 4 khz Output Voltage Trim Range 2 40 % Wide Trim) Output Voltage Trim Range 2 Narrow Trim).V 90 90 90 90 90 90 90 90 1 1 1 1 1 1 1 1 % Weight 4. 9 g 1. Vin=12V, full load and Ta=25 C. 2. See graphs on pages 17-25. Control Specifications Parameter Module Symbol Min Typical Max Units Remote On/Off Vouten V Signal Low Unit Off) Signal High Unit On) -0. 1 V 2. 8 1. 2 V. With remote on/off pin 1 open, the module is on. page 7

NON-ISOLATED DC/DC CONVERTERS Efficiency Data MODULE MODULE.V % 95% EFFICIENCY 95% 90% 85% % 75% 70% 0. 1.25 2..75 5.00 OUTPUT CURRENT.8 12 1.2 EFFICIENCY 90% 85% % 75% 70% 0. 1.25 2..75 5.00 OUTPUT CURRENT.8 12 1.2 MODULE MODULE EFFICIENCY 95% 90% 85% % 75% 70% 65% 0. 1.25 2..75 5.00 OUTPUT CURRENT.8 12 1.2 EFFICIENCY 90% 85% % 75% 70% 65% 60% 0. 1.25 2..75 5.00 OUTPUT CURRENT.8 12 1.2 page 8

Efficiency Data MODULE MODULE EFFICIENCY 90% 85% % 75% 70% 65% 60% 0. 1.25 2..75 5.00 OUTPUT CURRENT.8 12 1.2 EFFICIENCY 85% % 75% 70% 65% 60% 55% % 0. 1.25 2..75 5.00 OUTPUT CURRENT.8 12 1.2 MODULE MODULE EFFICIENCY 85% % 75% 70% 65% 60% 55% % 0. 1.25 2..75 5.00.8 12 1.2 EFFICIENCY 85% % 75% 70% 65% 60% 55% % 0. 1.25 2..75 5.00.8 12 1.2 OUTPUT CURRENT OUTPUT CURRENT page 9

NON-ISOLATED DC/DC CONVERTERS Ripple and Noise ~.V modules with 22µF/6.V X5R ceramic cap at the output. module with µf/v X5R ceramic cap at the output. Ripple and noise at full load and 12Vdc input, dc output and Ta=25 C Ripple and noise at full load and 12Vdc input,.vdc output and Ta=25 C Ripple and noise at full load and 12Vdc input, dc output and Ta=25 C Ripple and noise at full load and 12Vdc input, dc output and Ta=25 C page

Ripple and Noise ~.V modules with 22µF/6.V X5R ceramic cap at the output. module with µf/v X5R ceramic cap at the output. Ripple and noise at full load and 12Vdc input, dc output and Ta=25 C Ripple and noise at full load and 12Vdc input, dc output and Ta=25 C Ripple and noise at full load and 12Vdc input, dc output and Ta=25 C Ripple and noise at full load and 12Vdc input, dc output and Ta=25 C page 11

NON-ISOLATED DC/DC CONVERTERS Transient Response Transient response: di/dt = 0.5A/µS, ~.V modules with 220µF/6.V tant cap, module with µf/v tant cap. Vout= % to % load transients at 12V input and Ta=25 C Vout= % to % load transients at 12V input and Ta=25 C Vout=.V % to % load transients at 12V input and Ta=25 C Vout=.V % to % load transients at 12V input and Ta=25 C page 12

Transient Response Transient response: di/dt = 0.5A/µS, ~.V modules with 220µF/6.V tant cap, module with µf/v tant cap. Vout= % to % load transients at 12V input and Ta=25 C Vout= % to % load transients at 12V input and Ta=25 C Vout= % to % load transients at 12V input and Ta=25 C Vout= % to % load transients at 12V input and Ta=25 C page 1

NON-ISOLATED DC/DC CONVERTERS Transient Response Transient response: di/dt = 0.5A/µS, ~.V modules with 220µF/6.V tant cap, module with µf/v tant cap. Vout= % to % load transients at 12V input and Ta=25 C Vout= % to % load transients at 12V input and Ta=25 C Vout= % to % load transients at 12V input and Ta=25 C Vout= % to % load transients at 12V input and Ta=25 C Vout= % to % load transients at 12V input and Ta=25 C Vout= % to % load transients at 12V input and Ta=25 C page 14

Transient Response Transient response: di/dt = 0.5A/µS, ~.V modules with 220µF/6.V tant cap, module with µf/v tant cap. Vout= % to % load transients at 12V input and Ta=25 C Vout= % to % load transients at 12V input and Ta=25 C Thermal Considerations Vin = 12V xrah-05a1a0 0.9 ~ page 15

NON-ISOLATED DC/DC CONVERTERS Thermal Considerations xrah-05a1a0 ~.V xrah-05a0 page 16

Output Voltage Set-Point Adjustment Trim Down Test Circuit Trim Up Test Circuit Vo Vo Trim Trim Gnd Gnd xrah-05a1a0 Trim Resistor Calculation Rtrim up =.712 0.261) Kohm page 17

NON-ISOLATED DC/DC CONVERTERS Output Voltage Set-Point Adjustment xrah-05a090 Trim Resistor Calculation Rtrim up =.712 40.2) Kohm page 18

Output Voltage Set-Point Adjustment xrah-05a Trim Resistor Calculation Rtrim down = 0.9516 8.47) Kohm Rtrim up =.712.8) Kohm page 19

NON-ISOLATED DC/DC CONVERTERS Output Voltage Set-Point Adjustment xrah-05a120 Trim Resistor Calculation Rtrim down = 1.879 14.640) Kohm Rtrim up =.712 ) Kohm page 20

Output Voltage Set-Point Adjustment xrah-05a1 Trim Resistor Calculation Rtrim down =.27 20.84) Kohm Rtrim up =.712 16.2) Kohm page 21

NON-ISOLATED DC/DC CONVERTERS Output Voltage Set-Point Adjustment xrah-05a1 Trim Resistor Calculation Rtrim down = 4.669 24.24) Kohm Rtrim up =.712 19.6) Kohm page 22

Output Voltage Set-Point Adjustment xrah-05a2 Trim Resistor Calculation Rtrim down = 7.912 17.94) Kohm Rtrim up =.712 1.) Kohm page 2

NON-ISOLATED DC/DC CONVERTERS Output Voltage Set-Point Adjustment xrah-05a0 Trim Resistor Calculation Rtrim down = 11.614 14.64) Kohm Rtrim up =.712 ) Kohm page 24

Output Voltage Set-Point Adjustment xrah-05a0 Trim Resistor Calculation Rtrim down = 19.4618.8) Kohm Rtrim up =.712 6.19) Kohm page 25

NON-ISOLATED DC/DC CONVERTERS Mechanical SRAH-05A 0.400 [.16] Suggested PCB Pad Layout 0.065 [1.65] 0.60 [15.24] 0.0 [1.27] 0.855 [21.72] 0.1 [2.79] 0.70 [17.78] 0. [2.54] R0.015 [R0.8] typ R0.008 [R0.20] typ 0.012 [0.0] 0-5 0.0 0.20 [1.27] 0. [8.1] 0.020 [2.54] [0.51] 0.400 4x [.16] 0.7 [19.81] 0.004 [0.] 0.055 [1.40] 2x 0.090 [2.29] 2x Dimensions are in inches [millimeters]. Standard dimension tolerance is ±0.005 [0.1] unless otherwise noted. Pin Function 7 6 1 Remote On/Off 2 +Vin Ground 4 +Vo 5 Trim 6 No Connection 1 2 4 5 7 No Connection page 26

Mechanical 0.700 [17.78] VRAH-05A 0.600 [15.24] 0.0 [1.27] 0.265 [6.7] min 0.0 [1.27] 0. [2.54] 0.400 [.16] 0.020 [0.51] 0.08 [7.82] Dimensions are in inches [millimeters]. Standard dimension tolerance is ±0.005 [0.1] unless otherwise noted. Pin Function 1 Remote On/Off 2 +Vin Ground 4 +Vo 5 Trim 1 2 4 5 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 240ºC. CORPORATE Bel Fuse Inc. 206 Van Vorst Street Jersey City, NJ 0702 Tel 201-42-046 Fax 201-42-9542 www.belfuse.com FAR EAST Bel Fuse Ltd. 8F / 8 Luk Hop Street San Po Kong Kowloon, Hong Kong Tel 852-228-5515 Fax 852-252-706 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 44-1772-88866 www.belfuse.com page 27