LTC3726 - Secondary-Side Synchronous Forward Controller Data Sheet Linear Techology Corporation

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Specifications	LTC3726 - Secondary-Side Synchronous Forward Controller Data Sheet Linear Techology Corporation
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1 LTC3726 3726fb , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. OPTI-LOOP is a registered trad

Specifications	LTC3726 - Secondary-Side Synchronous Forward Controller Data Sheet Linear Techology Corporation
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Content	1 LTC3726 3726fb , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. OPTI-LOOP is a registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6144194. Other patents pending. APPLICATIOSU FEATURES TYPICAL APPLICATIOU DESCRIPTIOU Secondary-Side Synchronous Forward Controller ■Secondary-Side Control for Fast Transient Response ■Self-Starting Architecture Eliminates Need for Separate Bias Regulator ■Proprietary Gate Drive Encoding Scheme Reduces System Complexity ■Current Mode Control Ensures Current Sharing ■PLL Fixed Frequency: 100kHz to 500kHz ■±1% Output Voltage Accuracy ■OPTI-LOOP Compensation ■Available in a Narrow 16-Lead SSOP Package ■Isolated 48V Telecommunication Systems ■Internet Servers and Routers ■Distributed Power Step-Down Converters ■Automotive and Heavy Equipment 36V-72V to 3.3V/20A Isolated Forward Converter The LTC®3726 is a secondary-side controller for synchro- nous forward converters. When used in conjunction with the LTC3705/LTC3725 gate driver and primary-side con- trollers, the part creates a complete isolated power supply that combines the simplicity of OPTI-LOOP® compensa- tion with the speed of secondary-side control. The LTC3726 has been designed to simplify the design of highly efficient, secondary-side forward converters. Work- ing in concert with the LTC3705 or LTC 3725, the LTC3726 forms a robust, self-starting converter that eliminates the need for the separate bias regulator that is commonly used in secondary-side control applications. In addition, a pro- prietary scheme is used to multiplex gate drive signals and DC bias power across the isolation barrier through a single, tiny pulse transformer. The LTC3726 is available in a 16-lead SSOP package. NDRV GNDPGNDVSLMT UVLO BOOST LTC3705 BAS21 FQT7N100.22µF 10µF 25V CMPSH1-4 1.2Ω L1 1.2µH TGTSBGIST2 1µF 162k L1: COILCRAFT SER2010-122 T1: PULSE PA0807 T2: PULSE PA0297 33nF 30mΩ 1W 2mΩ 2W Si7336ADPSi7336ADP ×2 T1 •• MURS120 Si7852DP Si7852DP MURS120 VCC 33nF15k 1% 365k 1% 100k 2.2µF 25VSS/FLT FB/IN+ FS/IN– VIN– VIN+ 330µF 6.3V ×3 680pF 22.6k 1%20k 102k 1% VOUT– 3726 TA01 VOUT+ •• 1µF 100V x3 FGSWSGVCC GNDPGNDSLPMODE PT+ IS+ IS– PT– RUN/SS LTC3726ITH FB/PHASE FS/SYNC 7.5V2.2µF FZT690B 5k
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Following Datasheets	375-1 (4 pages) 38-1_3 (1 pages) 38_3 (2 pages) 3818hv (1 pages) 382017 (1 pages) 382206 (1 pages) 382211 (1 pages) 382410A (1 pages) 382_2 (6 pages) 3838C (5 pages)
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