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TPS92691-Q1: Enable/Disable switching

Vaibhav Khatri
Prodigy 160 points
Part Number: TPS92691-Q1


Tool/software:

Hello,

I am planning to use TPS92691-Q1 for a LED driver design and I intend to use it in BOOST mode. In my design I don't intend to use the PWM dimming functionality, so if I tie PWM pin to VCC, would I still get the intended output voltage after switching?

As per my interpretation of the datasheet, can TPS92691-Q1 be enabled or disabled by controlling the voltage on SS(Soft-start) pin?

Thanks

Vaibhav Khatri 

  • 0
    TI__Expert 6170 points


    Hi Vaibhav,

    Vaibhav Khatri said:
    I am planning to use TPS92691-Q1 for a LED driver design and I intend to use it in BOOST mode. In my design I don't intend to use the PWM dimming functionality, so if I tie PWM pin to VCC, would I still get the intended output voltage after switching?

    Yes, please refer to the following section of the data sheet

    Vaibhav Khatri said:
    As per my interpretation of the datasheet, can TPS92691-Q1 be enabled or disabled by controlling the voltage on SS(Soft-start) pin?

    Yes, however, if you pull down the voltage on the soft start pin, then the device will have to go through soft start again when re-enabled.

    Best,
    Daniel 

  • 0 in reply to Daniel Louis
    Prodigy 160 points

    Hi Daniel,

    I intend to use the SS pin as an ON/OFF switch in my design, so I think it is acceptable when I turn OFF and turn ON the system again, I want the device to go through soft-start. 

    Can I use a FET to switch the SS pin between ground and soft-start capacitor?

    Thanks,

    Vaibhav Khatri