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LM5033: LM5033 out1 and out2 both low at power on start up?

hailong xu1
Intellectual 260 points
Part Number: LM5033

LM5033 out1 and out2 both low level at power on start up? if I tie CS to GND,  is duty cycle close to 50%? if the delivery power is less than 20W (12V), do I have to use a MOSFET driver to driver switch?

  • 0
    TI__Mastermind 27135 points
    Hi Hailong,

    Thanks for your interest in LM5033.

    1. Both Out1 and Out2 are low at startup.

    2. The CS pin is only for overcurrent protection (LM5033 is voltage mode). 50% duty cycle is just above the maximum duty cycle when accounting for deadtime. There is an internal pull-up on the comp pin so if you operate open-loop, LM5033 will operate with the max duty cycle. Take a look at section 7.3.3 of the datasheet:www.ti.com/.../lm5033.pdf.

    2. LM5033 has 1.5A source/sink drivers. Whether you need a an external gate driver or not depends on the gate capacitance of your MOSFET's. I would expect you would not need an external gate driver for the power range you are interested in.

    Best Regards,
    Ben Lough