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LT3752 Datasheet(PDF) 1 Page - Linear Technology |
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LT3752 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 48 page  LT8311 1 8311f For more information www.linear.com/LT8311 TYPICAL APPLICATION FEATURES DESCRIPTION Synchronous Rectifier Controller with Opto-Coupler Driver for Forward Converters The LT®8311 is used on the secondary side of a forward converter to provide synchronous MOSFET control and output voltage feedback through an opto-coupler. The LT8311’s unique preactive mode allows control of the secondary-side MOSFETs without requiring a traditional pulse transformer for primary- to secondary-side com- munication.Inpreactivemode,theoutputinductorcurrent operates in discontinuous conduction mode (DCM) at light load. If forced continuous mode (FCM) operation is desired at light load, the LT8311 can, alternatively, be used in SYNC mode, where a pulse transformer is required to send synchronous control signals from the primary-side IC to the LT8311. The LT8311 offers a full featured opto-coupler controller, incorporating a 1.5% reference, a transconductance error amplifier and a 10mA opto-driver. Power good monitoring and output soft-start/overshoot control are also included. The LT8311 is available in a 16-lead FE package with pins removed for high voltage spacing requirements. 18V to 72V, 12V/8A Active Clamp Isolated Forward Converter APPLICATIONS n Wide Input Supply Range: 3.7V to 30V n Preactive Mode: n No Pulse Transformer Required n DCM Operation at Light Load n SYNC Mode: n FCM or DCM Operation at Light Load n Achieves Highest Efficiency n 1.5% Feedback Voltage Reference n 10mA Opto-Coupler Driver n Output Power Good Indicator n Integrated Soft-Start Function n Offline and HV Car Battery Isolated Power Supplies n 48V Isolated Power Supplies n Industrial, Automotive and Military Systems L , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 8311 TA01 LT3753 UVLO_VSEC OVLO IVSEC RT TOS TBLNK TAO TAS GND SS1 SS2 INTVCC AOUT FB SYNC SOUT 71.5k 1µF 0.47µF 4.7µF × 3 VIN 18V to 72V VIN 100k 5.9k 1.82k 31.6k 240kHz 34k COMP ISENSEN OC OUT ISENSEP 49.9k 2.2µF 100V • • 100nF 4.7µF 2k 6m 100 1µF 1k 100k 100k 124k LT8311 FSW CSW CSP CG CSN OPTO GND COMP SYNC PMODE SS FB VIN INTVCC PGOOD TIMER VOUT 12V VOUT 6.8µH 1.78k 1.5k FG 2k 100k 20k 11.3k 22µF × 2 2k 1.78k 470µF 68pF 15nF 2.94k 1µF 4.7µF 2.2µF 2.2nF 10k 100nF 4:4 100k 2.2nF 10pF + |
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