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External parts of TPS61196

Takahiro Nishizawa
Genius 5575 points
Other Parts Discussed in Thread: TPS61196

We have questions about TPS61196.

Question 1. Capactior of REF pin.

In datasheet p.1 Simplified Schematic,

Capacitor of REF pin is 2.2µF.

But Capacitor of REF pin is 0.33µF in EVM User's guide.

Please tell us the reason why value of capacitance are different.

Question 2.

Please tell us the purpose of C4 in datasheet p.1  Simplified Schematic.

We can't find this capacitor in the Functional Block Diagram datasheet p.11.

Question 3.

Please tell us the reason why R5 is added in datasheet p.1  Simplified Schematic.

Best regards,

Takahiro Nishizawa

  • 0
    TI__Mastermind 22745 points
    Hi Takahiro,
    1. The cap connected to VREF pin is used to adjust the soft start time, 1uF to 4.7uF is ok, you can change dring this range.
    2. C4 was just tused to decrease the ripple to UVLO pin, this is not very important componnet;
    3. R5 was used to cooperate with C5 to provide a RC filter for UVLO pin. It depends on your real application. It's ok to remove them.
    Regards
    Sean