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PTD08D210W: About PWM input pin

Y.Ottey
Mastermind 6145 points
Part Number: PTD08D210W
Other Parts Discussed in Thread: UCD9248,

Dear TI team

Our customers are using UCD9248 and PTD08D210W as a set.
I have a question about the input pin of the PWM signal of PTD08D210W (the module on which UCD7240 is installed).

1. When the PWM signal input to the PWM-A (PWM-B) pin of PTD08D210W (UCD7240) becomes 0V, it is good to recognize that the output A (output B) becomes 0V even when the input voltage is 0V or more. Is it?

2. If the PWM-A and PWM-B pins are floating, or if there is a momentary noise from the PWM-A and PWM-B low states, will the PWM-A and PWM-B pins be low? ..
(I thought that there was an internal pull-down on the input pins of PWM_A and PWM_B, so I asked.)

Best Regards,
Y.Ottey

  • 0
    TI__Mastermind 35115 points

    Hi ,

    Since these questions seem to be more on the UCD7240 within the module, I have notified someone who might be able to help you with questions on that device.

  • 0 in reply to Anthony F
    TI__Expert 5965 points

    Hi Y.Ottey,

    For #1, if PWM-A (or PWM-B) pin is low, the high side FET is off, the low side FET is either on (when SRE is high) or off (when SRE is low)> In both cases, output should be low if there is no leakage from other sources, and the output has been discharged by the load.

    For #2, the PWM pin has 50k internal pull up to 3.3V, and 50k pull down to GND. So if these pins are floating, it should stay at ~1.65V and both high side and low side FET should be off. 

    Regards,

    Weidong