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 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 100ns. Additional features include:
line Under-Voltage Lockout (UVLO), soft-start, an error amplifier, precision voltage reference, and
The two differences between the LM5041 and the LM5041A are: No second level current limit
in the 'A' version No softstart (SS) shutdown comparator in the 'A' version.
View datasheet View product folder