Secondary side drivers protect power MOSFETs

28 January 2004 Power Electronics / Power Management Access Control & Identity Management

Linear Technology's two secondary side synchronous N-channel MOSFET drivers, the LTC3900 and LTC3901 have timer and current sense comparators to protect their external MOSFETs during normal and light load operation, power up/down, and when the driver supply voltage drops too low. A programmable timeout function disables the synchronous drivers when the synchronisation signal between the primary and secondary sides is missing or incorrect - protecting the MOSFETs from overvoltage and electrical overstress. Additionally, the ICs turn off the MOSFETs if the negative inductor current exceeds a user-programmable level. Moreover, to ensure proper power up and power down, these drivers shut off the MOSFETs when the driver input voltage is below 4 V. The LTC3900 is designed for use in forward converter topologies and the LTC3901 is suited for use in push-pull and full-bridge converters.

Memec SA, 011 897 8600

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