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 guaranteed overlap time (for current-fed applications) or a guaranteed 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 features include line Under-Voltage Lock-Out
(UVLO), Soft-Start, an error amplifier, precision voltage reference, and thermal shutdown.
The differences between LM5041, LM5041A and LM5041B are as follows: In the LM5041A and the LM5041B version, the hiccup mode
over-current protection is not employed and the VCC bias regulator is not disabled by a low state at the SS pin. In the LM5041B
version, both the high and low side buck stage gate drivers are forced to a low state when the controller is disabled. In
the LM5041 and the LM5041B version, the buck stage controller is disabled by either a low state at the
UVLO pin or a low state at the SS pin. Also in the LM5041B version, the REF pin 5V regulator is not disabled by a
UVLO pin low state.
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