STEVAL-ISA169V1

STEVAL-ISA169V1 Evaluation board: SRK2001L adaptive synchronous rectification controller for LLC resonant converters with STL140N4LLF5 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 (logic level driver) SR MOSFET type: STL140N4LLF5 (40 V – 3.1 mΩ) PowerFlat April 2015 The STEVAL-ISA169V1 is a product evaluation board designed to demonstrate the performance of the SRK2001L synchronous rectification controller. The SRK2001L 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 (PowerFlat package) and can be easily implemented in an existing converter as a substitute for rectifier diodes. DocID027705 Rev 1 1/4 www.st.com 2/4 DocID027705 Rev 1 N.M. C503 N.M. R510 N.M. D501 Q504 N.M. Q501 STL140N4LLF5 DR1 EN 6 7 8 9 10 0R R503 R513 N.M. N.M. 0R R507 R512 0R R506 100R SRC2 DVS2 SVS2 GD2 PROG R505 DVS1 SVS1 GD1 GND VCC 100k R502 100R SRC1 5 4 3 2 1 U501 SRK2001L R504 0R R501 DR2 Q502 STL140N4LLF5 Q505 N.M. N.M. D502 Q503 BC847 N.M. C504 N.M. R511 2n7 C502 1k0 SRC2 DR2 1k0 DR1 SRC1 +12V R509 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 1uF C501 +12V Schematic diagram STEVAL-ISA169V1 Schematic diagram Figure 1: STEVAL-ISA169V1 circuit schematic GSPG01042015DI1030 STEVAL-ISA169V1 2 Revision history Revision history Table 1: Document revision history Date Version 17-Apr-2015 1 DocID027705 Rev 1 Changes Initial release. 3/4 STEVAL-ISA169V1 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 DocID027705 Rev 1