The LM5041BMTCX/NOPB 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 LM5041BMTCX/NOPB 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 stageMOSFETs can be driven directly from the internal gate drivers while the buck stage requires an external driver such as the LM5102. The LM5041BMTCX/NOPB 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 LM5041BMTCX/NOPB are as follows:In the LM5041A and the LM5041BMTCX/NOPB 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 LM5041BMTCX/NOPB 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 LM5041BMTCX/NOPB version, the buck stage controller is disabled by either a low state at theUVLO pin or a low state at the SS pin.Also in the LM5041BMTCX/NOPB version, the REF pin 5V regulator is not disabled by aUVLO pin low state.
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