STEVAL-ISA166V1

STEVAL-ISA166V1 Evaluation board: SRK2001 adaptive synchronous rectification controller for LLC resonant converters with STP77N6F6 Data brief Description Features       Synchronous rectifier for LLC resonant converter, with adaptive turn-on and turn-off VCC range: 4.5 V to 32 V Max frequency: 500 kHz Dual gate drive for N-channel MOSFETs (strd level driver) SR MOSFET type: STP77N6F6 (60 V – 7 mΩ) TO-220 RoHS compliant April 2015 The STEVAL-ISA166V1 is a product evaluation board designed to demonstrate the performance of the SRK2001 synchronous rectification controller. The SRK2001 implements a control scheme specific for secondary-side synchronous rectification in LLC resonant converters that use a transformer with center-tap secondary winding for full-wave rectification. It provides two highcurrent gate-drive outputs (for driving N-channel power MOSFETs). Each gate driver is controlled separately and an interlock logic circuit prevents the two synchronous rectifier (SR) MOSFETs from conducting simultaneously. Device operation is based on adaptive algorithms for both turn-on and turn-off of SR MOSFETs. During fast load transitions or during above resonance operation, a further turn-off mechanism is provided, based on a ZCD_OFF comparator that triggers the gate drive circuit for very fast MOSFET turn-off. The board includes two SR MOSFETs (in a TO-220 package) and can be easily implemented in an existing converter as a substitute for rectifier diodes. DocID027522 Rev 1 For further information contact your local STMicroelectronics sales office 1/4 www.st.com N.M. N.M. SRC2 C504 C503 Q502 STP77N6F6 N.M. 0R 1 DR2 R511 0R R507 6 0R R506 DVS2 7 R503 100R SRC1 GD2 SVS2 8 9 10 N.M. 1 EN PROG R505 DVS1 SVS1 GD1 GND VCC 100k R502 100R 5 4 3 2 1 U501 SRK2001 R504 1uF R501 0R Q503 BC847 R510 Q501 STP77N6F6 DR1 2 DocID027522 Rev 1 3 2/4 2 1k0 2n7 1k0 DR1 SRC1 +12V SRC2 DR2 R509 C502 R508 1 2 3 4 5 6 7 8 9 10 11 12 13 JP501 HEADER 13 1 2 3 4 5 6 7 8 9 10 11 12 13 1 3 C501 +12V Schematic diagram STEVAL-ISA166V1 Schematic diagram Figure 1: STEVAL-ISA166V1 circuit schematic GSPG19022015DI1025 STEVAL-ISA166V1 2 Revision history Revision history Table 1: Document revision history Date Rev 16-Apr-2015 1 DocID027522 Rev 1 Changes First release. 3/4 STEVAL-ISA166V1 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. © 2015 STMicroelectronics – All rights reserved 4/4 DocID027522 Rev 1