TLV9002: TLV9002 application query

Harry Ma

Part Number: TLV9002
Other Parts Discussed in Thread: TLV2702

Hi Team

Customer wanna fulfill a function show as following. Vin is PWM, convert to a analog voltage which is proportional with the PWM pulse width through a first amplifier stage. then the analog voltage is compared with the reference voltage of the post-stage amplifier (used as a comparator) to obtain the final output.

PWM's frequency is 10HZ, and amplitude is 2V.

Does this function can fulfilled by TLV9002?

Thanks!

over 2 years ago

0 Clemens Ladisch over 2 years ago

Guru 298820 points

The TLV9002 could be used as a comparator. But it might be a better idea to use one op-amp and one comparator, i.e., TLV2702.

A simple first-order low-pass filter can be built with an R-C circuit. For active low-pass filters, see the Active Low-Pass Filter Design application note. (The TLV2702 datasheet also has an example.)

0 kai klaas69 over 2 years ago

Guru 140200 points

Hi Harry,

yes, this should work. But you will need a big time constant in the low pass filter if the PWM is only 10Hz. And you should run the comparator with hysteresis.

Kai

+1 Ashley Kang over 2 years ago in reply to kai klaas69

TI__Genius 13670 points

Hi Harry,

You can also reference this TI Design on PWM to analog out: https://www.ti.com/lit/ug/tidu027/tidu027.pdf

The TLV9002 can be used as the post Amp section after the low pass filter section.

Please let me know if you have any questions.
Thank you!

Best Regards,
Ashley

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TLV9002: TLV9002 application query