LT8311EFE#PBF

LT8311 is a synchronous rectifier controller with opto-coupler driver for forward converters. It is used on the secondary side of a forward converter to provide synchronous MOSFET control and output voltage feedback through an opto-coupler. This device’s unique preactive mode allows control of the secondary-side MOSFETs without requiring a traditional pulse transformer for primary- to secondary-side communication. In preactive mode, the output inductor current operates in discontinuous conduction mode (DCM) at light load. If forced continuous mode (FCM) operation is desired at light load, this device 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 device. It is used in applications such as offline and HV car battery isolated power supplies, 48V isolated power supplies, industrial, automotive and military systems etc.

• Wide input supply range is 3.7V to 30V
• No pulse transformer required, DCM operation at light load
• Achieves highest efficiency
• 1.5% feedback voltage reference
• 10mA opto-coupler driver
• Output power good indicator
• Integrated soft-start function
• Quiescent current is 4.5mA typical at (TA = 25°C, VIN = 12V, VINTVCC = 8V)
• Operating junction temperature is -40°C to 125°C
• Package style is 20-lead plastic TSSOP

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