The LM5041B PWM controller contains all of the featuresnecessary to implement either current-fed or voltage-fedpush-pull or bridge power converters. These “Cascaded”topologies are well suited for multiple output and higher powerapplications. The LM5041B includes these four control outputs:the buck stage controls (HD and LD) and the push-pullcontrol outputs (PUSH and PULL). Push-pull outputs are drivenat 50% nominal duty cycle at one half of the switchingfrequency of the buck stage and can be configured for eithera guaranteed overlap time (for current-fed applications) or aguaranteed non-overlap time (for voltage-fed applications).Push-pull stage MOSFETs can be driven directly from the internalgate drivers while the buck stage requires an externaldriver such as the LM5102. The LM5041B includes a highvoltagestart-up regulator that operates over a wide inputrange of 15V to 100V. The PWM controller is designed forhigh-speed capability including an oscillator frequency rangeup to 1 MHz and total propagation delays of less than 100 ns.Additional features include line Under-Voltage Lock-Out(UVLO), Soft-Start, an error amplifier, precision voltage reference,and thermal shutdown.
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