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TPS73733 - Enable Pin and Shutdown

John Russo
Prodigy 140 points

All,

 

One of my customers has several questions regarding the ' Enable Pin' on the TPS73733 regulator.

 

1) How does the "output ramp back up to a regulated VOUT when EN is used to shutdown the regulator"?  Figure 23 of the data sheet shows Turn-On Response.

 

2)  The customer does not require shutdown capability, is it safe to tie Vin and EN together?  According to the data sheet, "This may result in reverse current flow on power-up", does the customer need to prevent reverse current flow?

 

3) When does he have to worry about reverse current flow, when Vin is removed OR on power-up?  According to the data sheet, "The output may overshoot upon power-up", how much overshoot?

 

Thanks for your support,

 

John

 

------------------------------------------------

John T. Russo

Senior Field Applications Engineer

Avnet

135 Engineers Road

Suite 140

Hauppauge, NY 11788

Phone:  (631) 582-7700

Direct:  (631) 582-7748

Fax:  (631) 582-7751

E-Mail:  john.russo@avnet.com

------------------------------------------------

 

 

  • 0
    TI__Guru 55940 points

    Hi John,

    It is safe to tie Vin and EN together, the customer would need to take measures to prevent reverse current flow.  The most likely time for overshoot will be when Vin is removed and residual charge on the gate of the pass element.  This charge (until depleted over time) provides a path from the output back through to the input (which is no longer present).

    The amount of overshoot is application dependent. 

    Very Respectfully,

    Ryan

  • 0 in reply to Ryan Eslinger
    Prodigy 140 points

    Ryan,

     

    Thanks for the info.  Does TI have any white papers or application notes that describe this?

     

    John