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XRP7664-65-74-75

2A/3A 18V Synchronous Step-Down Regulator, Constant frequency 

(XRP7664-65), Light-Load efficiency (XRP7674-75) 

 

 

 

© 2014 Exar Corporation 

8/8 

Rev. 2.0.0 

DOCUMENT REVISION HISTORY 

Revision 

Date 

Description 

1.0.0 

10/29/10 

Initial release of XRP7664-65 EVB Manual 

1.0.0 

03/22/13 

Initial release of XRP7674-75 EVB Manual 

2.0.0 

08/19/14 

Initial release of combined XRP7664-65-74-75 EVB Manual 

BOARD REVISION HISTORY 

Board Revision 

Date 

Description 

146-6688-01 

10/29/10 

Initial release of evaluation board XRP7664-65 

146-6688-04 

03/22/13 

Initial release of evaluation board XRP7674-75 

146-6688-05 

08/19/14 

Initial release of combined XRP7664-65-74-75 EVB 

 

 

FOR FURTHER ASSISTANCE 

Email: 

[email protected]

 

 

[email protected]

 

Exar Technical Documentation: 

http://www.exar.com/TechDoc/

 

 

 

E

XAR 

C

ORPORATION

 

H

EADQUARTERS AND 

S

ALES 

O

FFICES

 

48720 Kato Road 

Fremont, CA 94538 – USA 

Tel.: +1 (510) 668-7000 

Fax: +1 (510) 668-7030 

www.exar.com 

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. 

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. 

Содержание XRP7664-65-74-75

Страница 1: ...required at EN pin in order to turn the regulator on and off STANDARD CONFIGURATION The XRP76XXEVB evaluation board is configured to operate under the following conditions and parameters Input voltage range 4 5V 18V Output voltage range 3 3V Output current load range 0 2A 3A EVALUATION BOARD MANUAL FEATURES 2A 3A Continuous Output Current 4 5V to 18V Wide Input Voltage PWM Current Mode Control Adj...

Страница 2: ...or divider connected to FB programs the output voltage If the feedback pin exceeds 1 1V the over voltage protection will trigger If the feedback voltage drops below 0 3V the oscillator frequency is lowered to short circuit protection COMP 6 Compensation pin This is the output of transconductance error amplifier and the input to the current comparator It is used to compensate the control loop Conne...

Страница 3: ...te the output at 3 3V upon turning on the input supply The XRP76XX should provide nominal efficiency equal to figure 4 of the datasheet JUMPER J1 FUNCTION Jumper J1 can be used to either connect EN to VIN or allow an independent logic level control signal to be applied to EN The board is supplied from EXAR with jumper set at left side position marked EN VIN This allows for automatic startup of the...

Страница 4: ...d efficiency XRP7674 75 2014 Exar Corporation 4 8 Rev 2 0 0 EVALUATION BOARD SCHEMATICS C4 22uF CSS 0 1uF CBS 10nF CC nF RC k CC1 DNP R4 100k J1 1 2 3 FB C2 DNP C3 22uF GND VIN VOUT GND EN 1 SW 1 U1 XRP76XX BS 1 IN 2 SW 3 GND 4 FB 5 COMP 6 EN 7 SS 8 L1 uH R1 26 1k R2 10k C1 uF EN EXT EN VIN SW SW FB ...

Страница 5: ...03 Resistor 100K Ohm 1 J1 1 Wurth Elektronik 61304011121 Conn Header 0 1 3POS J1 JUMPER 1 Wurth Elektronik 609002115121 CONN JUMPER SHORT VIN VOUT GND EN SW 6 Vector Electronic K24C M 042 Dia Test Point Post Reference Qty Manufacturer Part Number Size Component PCB 1 Exar XRP7665EVB 1 3 x2 XRP7665 Evaluation kit U1 1 Exar XRP7665 PSO 8 3A Buck Regulator L1 1 Wurth Elektronik 744314850 7x7x5mm 8 5u...

Страница 6: ... Resistor 100K Ohm 1 J1 1 Wurth Elektronik 61304011121 Conn Header 0 1 3POS J1 JUMPER 1 Wurth Elektronik 609002115121 CONN JUMPER SHORT VIN VOUT GND EN SW 6 Vector Electronic K24C M 042 Dia Test Point Post Reference Qty Manufacturer Part Number Size Component PCB 1 Exar XRP7675EVB 1 3 x2 XRP7675 Evaluation kit U1 1 Exar XRP7675EVB PSO 8 3A Buck Regulator Light Load efficient L1 1 Wurth Elektronik ...

Страница 7: ...3A 18V Synchronous Step Down Regulator Constant frequency XRP7664 65 Light Load efficiency XRP7674 75 2014 Exar Corporation 7 8 Rev 2 0 0 EVALUATION BOARD LAYOUT Fig 3 Component Placement Top Side Fig 4 Layout Bottom Side ...

Страница 8: ...s 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 spec...

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