TPS61170: CTRL pin function

Jatin Khatri

Part Number: TPS61170
Other Parts Discussed in Thread: TPS22810

Hello,

Want to use boost converter (12V to 24V - 'TPS61170'), need to understand it's o/p behavior with respect to 'CNTRL' pin if tied to +5V (High) or GND (Low). As datasheet mentions the IC will generate o/p per design in normal operation with 'CTRL' pin high (5V). What will be the o/p if 'CTRL' pin switch to 0V? Datasheet mention the boost convertor goes into shutdown mode. Will it be 0V o/p or follow same as input? i.e. same Vin reflects at o/p via inductor 'L1' and Diode 'D1' in series?

Thanks

4 months ago

+1 Brigitte 4 months ago

TI__Guru 60185 points

Hello Jatin,

The device will not switch and therefore you will see the input voltage minus some drop through the diode on the output. If the output shall go to 0V while the input is present, you need to add a switch either on the input or output side to break the path through the inductor and diode.

Best regards,
Brigitte

0 Jatin Khatri 4 months ago

Prodigy 20 points

Hello Brigitte,

Thanks for clarifying this. How about using a load switch 'TPS22810' to cut off 12V input to TPS61170? OR any better cost-effective option kindly suggest.