The LM5046MH is a Pulse Width Modulated (PWM) Controller contains all of the features necessary to implement a phase-shifted full-bridge topology power converter 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 100V. This highly integrated controller-driver provides dual 2A high- 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 dead-time to enable zero-volt switching of the primary FETs. Intelligent startup of the synchronous rectifiers allows monotonic turn-on of the power converter even with pre-bias load conditions. Additional features include cycle-by-cycle current limiting, hiccup mode restart, programmable soft-start, synchronous rectifier soft-start and a 2MHz capable oscillator with synchronization capability and thermal shutdown.
Highest integration controller for small
Form factor, high-density power converters
High-voltage start-up regulator
Intelligent sync rectifier start-up allows
Linear turn-on into pre-biased loads
Synchronous rectifiers disabled in UVLO mode and hiccup mode
Two independent, programmable dead-time
Adjustments to enable zero-volt switching
Four high-current 2A Bridge gate drivers
Wide-bandwidth opto-coupler interface
Dual-mode overcurrent protection
Programmable line UVLO and OVP
Green product and no Sb/Br
Device has limited built-in ESD protection, leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.