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LM5041B
www.ti.com SNVS605 – MAY 2009 LM5041B Cascaded PWM Controller
Check for Samples: LM5041B FEATURES DESCRIPTION The LM5041B PWM controller contains all of the
features necessary to implement either current-fed or
voltage-fed push-pull or bridge power converters.
These “Cascaded” topologies are well suited for
multiple output and higher power applications. The
LM5041B includes these four control outputs: the
buck stage controls (HD and LD) and the push-pull
control outputs (PUSH and PULL). Push-pull outputs
are driven at 50% nominal duty cycle at one half of
the switching frequency of the buck stage and can be
configured for either a specified overlap time (for
current-fed applications) or a specified non-overlap
time (for voltage-fed applications). Push-pull stage
MOSFETs can be driven directly from the internal
gate drivers while the buck stage requires an external
driver such as the LM5102. The LM5041B includes a
high-voltage start-up regulator that operates over a
wide input range of 15V to 100V. The PWM controller
is designed for high-speed capability including an
oscillator frequency range up to 1 MHz and total
propagation delays of less than 100 ns. Additional …
