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LMG1210: Is there something wrong with EN pin in our schematic circuit?

ümit sarier
Prodigy 10 points
Part Number: LMG1210

Hello,

we have  two inputs  EN and PWM for switching. When we applied EN =5V and  PWM signal (pulse width = 10us duty cycle =  %1 duty cycle), switching works correctly. But If EN = 0V,  we measure 4.5V at HS node. İs this normal?

Best Regards 

Ümit

  • 0
    TI__Genius 14145 points

    Hey Ümit,

    Thank you for your question regarding the LMG1210.

    When EN = 0V, the LO and HO outputs are set to low (0V). The voltage on HS is dependent on many factors including the output stage of your circuitry. So, the 4.5V that you are seeing is due to the impedance of HS to ground. This impedance is the parallel combination of its paths to ground which include the high-side FET through VIN, through the low-side FET, through the IC to VSS and also through the output stage of your load. So, the condition of 4.5V on HS without gate driver outputs is very possible and normal.

    Let me know if there are any further questions.

    Thank you,

    William Moore