XRP6141 - Exar Corporation
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1. EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness Products are not authorized for use in such applications unless EXAR Corporation receives in writing assurances to its satisfaction that a the risk of injury or damage has been minimized b the user assumes all such risks c potential liability of EXAR Corporation is adequately protected under the circumstances Reproduction in part or whole without the prior written consent of EXAR Corporation is prohibited O 2013 Exar Corporation 7 7 Rev 1 0 02. EXAR A New Direction in Mixed Signal November 2013 GENERAL DESCRIPTION The XRP6141 is a synchronous step down controller for point of load supplies up to 35A A wide 4 5V to 22V input voltage range allows for single supply operation from industry standard 5V 12V and 19 6V rails With a proprietary emulated current mode Constant On Time COT control scheme the XRP6141 provides extremely fast line and load transient response using ceramic output capacitors It requires no loop compensation hence simplifying circuit implementation and reducing overall component count The control loop also provides exceptional line regulation and maintains constant operating frequency A selectable power saving mode allows the user to operate in discontinuous mode DCM at light current loads thereby Significantly increasing the converter efficiency A host of protection features including over current over temperature short circuit and UVLO help achieve safe operation under abnormal operating conditions D1 gt MMSZ4699T1G R7 6k R6 2k XRP6141 35A Synchronous Step Down COT Controller Rev 1 0 0 EVALUATION BOARD MANUAL BN 4 5 a B EN 7M 2 um 4 5 5 R7 CBST Un a XRP6141EVB n 146 6702 02 lt FEATURES e 35A Capable Step Down Controller Wide Input Voltage Range 5V to 22V Single Supply o 4 5V to 5 5V Low Vin Integra
3. 1EVB 141EVB XRP6141 XRP6141 Evaluation kt kit cerro Foms7578 50 8 N Ch 25V 5 8mOhm MOSFET es o ponrroruate e o 0 m _ 0 coc o ponrroruate R1 R2 RA PANASONIC ERJ 3EKF1002V 0603 Resistor 10k 1 10W 1 SMD R3 RBST 2 PANASONIC ERI 3GEYOROOV 0603 Resistor 00 JumperSMD_ as o ponreopune e L 718 1 PANASONIC 0603 Resistor 2 49K Ohm 1 10w 1 SMD 1 PANASONIC ERL 3bEKF2001V 0603 Resistor 2K Ohm 1 10W 1 1 PANASONIC _ 0603 Resistor 6 04K Ohm 1 10W 1 SMD 1 PANASONIC _ 0603 ResistoriK Ohm 1 10W 1 1 panasonic ERL3EKFi821V 0603 Resistor 1 82k 1 10W 1 SMD RON 1 PANASONIC ERL3EKF1182V _ 0603 11 8 Ohm ohm 1 10W 1 SMI Rsnub 1 PANASONIC ERLGRGQFIROV 0805 Resisrtor 1 0 Ohm 1 8W 1 SMD i WathBekronk 61300311121 X PINCONNECTOR M lue mme Ll cam _ AGND VCC Wurth Elektronik 61300211121 DUAL TEST POINT pue mmi EN MODE Wurth Elektronik 61300111121 SINGLE Test Point Post STAND1 STAND2 2 Keystone 4 40 X 1 2 NENNEN STANDOFF O 2013 Exar Corporation 5 7 Rev 1 0 0 6141 E 35A Synchronous Step Down COT Controller A New Direction in Mixed Signal EVALUATION BOARD LAYOUT Fig 3
4. Component Placement Top Side Fig 4 Bottom Side Fig 5 Layer 2 Fig 6 Layer 3 2013 Exar Corporation 6 7 Rev 1 0 0 6141 35A Synchronous Step Down COT Controller A New Direction in Mixed Signal DOCUMENT REVISION HISTORY Revision Date Description y O 11 22 13 Initial release of document BOARD REVISION HISTORY Board Revision Due Deserto 146 6702 03 11 22 13 Initial release of evaluation board FOR FURTHER ASSISTANCE Email customersupport exar com powertechsupport exar com Exar Technical Documentation http www exar com TechDoc default aspx EXAR CORPORATION HEADQUARTERS AND SALES OFFICES 48720 Kato Road Fremont CA 94538 USA Tel 1 510 668 7000 Fax 1 510 668 7030 WWW exar com A New Direction in Mixed Signal NOTICE EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve design performance or reliability EXAR Corporation assumes no responsibility for the use of any circuits described herein conveys no license under any patent or other right and makes no representation that the circuits are free of patent infringement Charts and schedules contained here in are only for illustration purposes and may vary depending upon a user s specific application While the information in this publication has been carefully checked no responsibility however is assumed for inaccuracies
5. he Drain of the low side MOSFET Precision enable pin Pulling this pin above 1 9V will turn the IC on and it will operate in Forced CCM If the voltage is raised above 3 0V then the IC will operate in DCM or CCM depending on load Constant on time programming pin Connect with a resistor to AGND S on 8 O S Soft Start pin Connect an external capacitor between SS and AGND to program the soft start rate based on the 10uA internal source current PGOOD Power good output This open drain output is pulled low when Vour is outside the regulation Feedback input to feedback comparator Connect with a set of resistors to VOUT and omo GND in order to program Vour AGND 12 13 Analog ground Control circuitry of the IC is referenced to this pin Exposed Pad pad for heat dissipation Connect to AGND with a short trace 7 0 1 ORDERING INFORMATION Refer to 6141 5 datasheet and or www exar com for exact and up to date ordering information 2013 Exar Corporation 2 7 Rev 1 0 0 35A Synchronous Step Down COT Controller A New Direction in Mixed Signal USING THE EVALUATION BOARD POWERING UP Connect the VIN VIN with short thick leads to power supply Connect VOUT VOUT with short thick leads to electronic load Apply 12V using the power supply The XRP6141EVB should power up and regulate the output at 1 2V Rated output current is 25A Overcurrent protection should trigger a
6. t about 34A 2013 Exar Corporation 3 7 XRP6141 JUMPER 21 With the jumper set at CCM position the converter will operate in Forced CCM at VIN 12V 10 In order to operate in Forced CCM over a wider VIN range remove Jumper and apply an auxilary voltage in the range of 1 9V 3V to the EN test point With the jumper set at DCM CCM position the converter will operate at DCM CCM depending on load at VIN 12V 10 In order to operate in DCM CCM over a wider VIN range remove Jumper and apply an auxilary voltage in the range of 3 1V 5V to the EN test point Rev 1 0 0 6141 35A Synchronous Step Down Controller A New Direction in Mixed Signal EVALUATION BOARD SCHEMATICS D1 gt MMSZ4699T1G R7 6k R6 2k R8 1k R9 2 5k VIN DCM CCM EN MODE E RLIM 1 8k 1 RON 8k MT CBST 1uF FDMS7578 PWRGD L1 IHLP 5050FD 01 Rsnub MB 1 Ohm FDMS7650DC R3 Csnub 0 Oh 6 8nF CFF 0 56n 2013 Exar Corporation 4 7 0 47uH 41 1mOhm 2RSTPE330M7 12V C1 C2 C3 C4 CERAMIC 1210 X7R VOUT C5 C6 C7 C8 POSCAP 1 2V 0 25 a 6 8 9 10 11 12 13 T 330uF B30uF B30uUF OPEN OPEN OPEN OPEN T2 VOUT R1 10k 1 R2 4 10k 1 n Rev 1 0 6141 35A Synchronous Step Down Controller A New Direction in Mixed Signal BILL OF MATERIAL e P se M Number ear XRP614
7. ted high Current 2A 3A Drivers 0 6V to 18V Adjustable Output Voltage e Proprietary Constant On Time Control No Loop Compensation Required Ceramic Output Cap Stable operation Programmable 200ns 2us Quasi Constant 200kHz 800kHz Freq Selectable CCM or CCM DCM Operation T C1 C2 C3 C4 CERAMIC 1210 X7R L1 IHLP 5050FD 01 C5 C6 C7 C8 POSCAP 0 47uH 41 1mOhm 2R5TPE330M7 1 2V 0 25 L 6 7 8 9 10 11 2 13 r B30uF B30uF B30uF B30uF OPEN OPEN 3 R2 4 10k 1 Fig 1 XRP6141 Evaluation Board Schematics Exar Corporation 48720 Kato Road Fremont CA 94538 USA www exar com Tel 1 510 668 7000 Fax 1 510 668 7001 6141 35A Synchronous Step Down Controller A New Direction in Mixed Signal PIN ASSIGNMENT PGND VCC VIN AGND EXPOSED PAD BST ILIM EN Fig 2 XRP6141 Pin Assignment PIN DESCRIPTION Name PmMumbe OOOO Oo GL 1 Driver output for Low side N channel synchronous MOSFET NC 2 nternaly not connected Leave this pin floating SW Lower supply rail for high side gate driver GH Connect this pin to the junction between the two external N channel MOSFETS GH 4 o Driver output for high side N channel switching MOSFET BST 5 O High side driver supply pin Connect a 0 1uF bootstrap capacitor between BST and SW ILIM EN MODE Over current protection programming Connect with a resistor to t
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