Datasheet Texas Instruments LM5045MH/NOPB — 数据表

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SNVS699H – FEBRUARY 2011 – REVISED JANUARY 2015 LM5045 Full-Bridge PWM Controller With Integrated MOSFET Drivers
1 Features 3 Description The LM5045 PWM controller contains all of the
features necessary to implement full-bridge topology
power converters using either current mode or
voltage mode control. This device is intended to
operate on the primary side of an isolated DC-DC
converter with input voltage up to 100 V. This highly
integrated controller-driver provides dual 2-A highside and low-side gate drivers for the four external
bridge MOSFETs plus control signals for the
secondary-side synchronous rectifier MOSFETs.
External resistors program the leading and trailing
edge dead-time between the main and synchronous
rectifier control signals. Intelligent start-up of the
synchronous rectifiers allows monotonic turnon of the
power converter even with prebias load conditions.
Additional features include cycle-by-cycle current
limiting, hiccup mode restart, programmable softstart, synchronous rectifier soft-start, and a 2-MHz …