LM5041A
www.ti.com SNVS350B – MARCH 2005 – REVISED MARCH 2013 LM5041A Cascaded PWM Controller
Check for Samples: LM5041A FEATURES DESCRIPTION The LM5041A 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
LM5041A’s four control outputs include: 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 an overlap time (for current-fed
applications) or a both-off 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 LM5041A includes a high-voltage startup 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 100ns. Additional features include:
line Under-Voltage Lockout (UVLO), soft-start, an …
