MOSFET Driver Eliminates Signal Transformer

The LT8311 secondary-side MOSFET driver operates without the need for primary control in an isolated synchronous forward converter. Its unique preactive mode eliminates the need for a signal transformer for primary to secondary-side communication by sensing signals on the secondary side to control synchronous rectification. Features include input voltages from 6.5V to 400V, a 10-mA optodriver, feedback loop error amplifier, 1.5% reference voltage, power good monitor, and programmable soft-start of the output voltage.

LT8311 secondary-side MOSFET driver

The LT8311 is available in a TSSOP-20 package with several pins missing for high peak voltage spacing. The LT8311 E- and I-grade versions operate with junction temperature from a -40°C to +125°C. The LT8311 H grade operates from a -40°C to 150°C and the LT8311 MP grade from -55°C to +150°C. Prices start at $3.06 each/1,000. A datasheet is available at

Linear Technology Corp.
Milpitas, CA.

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