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LM5100A: LM5100 /SM74104

Tanvi Mahajan
Prodigy 120 points
Part Number: LM5100A
Other Parts Discussed in Thread: SM74104, LM5101A, LM5101

Hello 

I want to know what is the difference between LM5100 and SM74104. What are the features difference in both of them ? In result, the selection criteria which one to chose specifically in what requirement?

Thanks.

Regards

Tanvi Mahajan

  • 0
    TI__Mastermind 23015 points
    Hello Tanvi,
    Thank you for the interest in the LM5100, LM5101 family and SM74104. The LM5100, LM5101, LM5101A drivers have two independent inputs for the low side and high side drivers, the LO and HO outputs are controlled by the LI and HI inputs which allows for the LO and HO outputs to be on at the same time, which is required in some applications.
    The SM74104 driver is targeted for complementary LO and HO operation and has one control input. When IN is high HO is high and LO is low which is targeted for synchronous buck applications as well as other half bridge power device configurations. Also there is a dead time feature in the SM74104 which ensures that the active MOSFET is turned off before the other MOSFET is allowed to turn on during the switching transitions. The deadtime is adaptive which means the driver output must be low before the other MOSFET turns on for minimum dead time, or a resistor can be used on the RT pin to program a longer dead time.
    The SM74104 is a good candidate for sync buck applications where you only have a single PWM control signal. The LM5100 family of drivers is better for two transistor forward, half bridge and full bridge converters where you need to control the duty cycle of both transistors.

    Regards
    Richard Herring