TPS549A20: Internal discharge or similar feature to make Vout ramp down faster

Derek LaFaive

Part Number: TPS549A20

Is there a way to modify the Vout ramp time when turning off the device? A customer would like to know if there is a way to speed up the discharge time when turning the device off.

over 5 years ago

0 Gerold Dhanabalan - Online Design Tools over 5 years ago

TI__Genius 14455 points

Hi Derek

The TPS549A20 has a 6uA of Vout discharge current (spec'ed at Vout=0.5V) when the converter is disabled.

You can refer to the electrical characterisitics table in the datasheet.

regards,

Gerold

0 Derek LaFaive over 5 years ago in reply to Gerold Dhanabalan - Online Design Tools

TI__Intellectual 860 points

The customer is asking about the Voltage ramp down, not the discharge current. The customer would like to know if it is possible for the voltage to decrease more rapidly on shut off. For example, if the voltage is regulated to 3.3V and ramps down to 0V in 5ms at shut off. Is there a way to speed up that change in voltage at shut off?

0 David_Daniels over 5 years ago in reply to Derek LaFaive

TI__Mastermind 24065 points

Derek,

It is possible to use the VOUT_ADJUSTMENT( +9.00% to –9.00%) and VOUT_MARGIN (+12.0% to –11.6%) commands to lower the output voltage before disabling. Using the commands could speed up voltage ramping down by 20% to 40% faster.

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TPS549A20: Internal discharge or similar feature to make Vout ramp down faster