EVLSRK1000B-PF

EVLSRK1000B-PF SRK1000B adaptive synchronous rectification controller for flyback converter demonstration board with logic level SR MOSFET Data brief Description The EVLSRK1000B-PF is a demonstration board, designed for evaluation of the SRK1000B synchronous rectification controller. The SRK1000B implements a control scheme specific for secondary-side synchronous rectification in flyback converters and provides high-current gate-drive outputs for driving Nchannel power MOSFET. Features  Synchronous rectifier for flyback converter, with fixed turn-on and adaptive turn-off  VCC range: 3.5 V to 32 V  DVS max. operating voltage 90 V  Max. frequency: 500 kHz The device can operate both in quasi-resonant applications and in fixed frequency (FF) mixed DCM-CCM applications. The board is provided with a setting suitable for QR applications. To use in FF applications, a 100 pF capacitor needs to be added in C4. A 68 kΩ resistor (R5) is provided on the TON pin that fixes the blanking after the turnon to about 0.8 μs. The board includes the SR MOSFET (PowerFLAT 5 x 6 package) and can be easily implemented into an existing converter to substitute rectifier diodes.  Internal gate drive for N-channel MOSFET  SR MOSFET type: FDMS86103L logic level (100 V - 12 mΩ) PowerFLAT 5 x 6 package 19 October 2018 DB3428 Rev 1 For further information contact your local STMicroelectronics sales office. 1/4 www.st.com 2/4 )&"%&3
    + DB3428 Rev 1 /. $ /. 3 2 '%.4- #"584 %    (% (/% 7$$ 6 43,# $ 50/ 7"6 9 %74 /. 3    3 /. $ $ /84 % %#&7-43,#1'+)". 3 3 Electrical schematic EVLSRK1000B-PF Electrical schematic Figure 1. EVLSRK1000B-PF electrical schematic EVLSRK1000B-PF Revision history Revision history Table 1. Document revision history Date Revision 19-Oct-2018 1 Changes Initial release. DB3428 Rev 1 3/4 4 EVLSRK1000B-PF IMPORTANT NOTICE – PLEASE READ CAREFULLY STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST products are sold pursuant to ST’s terms and conditions of sale in place at the time of order acknowledgement. Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of Purchasers’ products. No license, express or implied, to any intellectual property right is granted by ST herein. Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product. ST and the ST logo are trademarks of ST. All other product or service names are the property of their respective owners. Information in this document supersedes and replaces information previously supplied in any prior versions of this document. © 2018 STMicroelectronics – All rights reserved 4/4 DB3428 Rev 1