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The LM5041A 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 higherpower applicaTIons. The LM5041A’s four control outputs include:the buck stage controls (HD and LD) and the pushpullcontrol outputs (PUSH and PULL). Push-pull outputs aredriven at 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 both-off time (for voltage-fed applications).Push-pull stage MOSFETs can be driven directly from theinternal gate drivers while the buck stage requires an externaldriver such as the LM5102. The LM5041A includes ahigh-voltage start-up regulator that operates over a wideinput range of 15V to 100V. The PWM controller is designedfor high-speed capability including an oscillator frequencyrange up to 1 MHz and total propagation delays of less than100ns. Additional features include: line Under-Voltage Lockout(UVLO), soft-start, an error amplifier, precision voltagereference, and thermal shutdown.
