OPA2325: question

Yasushi Fujiwara

Part Number: OPA2325
Other Parts Discussed in Thread: LM2903B, LM4041C, , OPA2376

Hello Experts,

I would like to connect a shunt voltage reference (LM4041C) as voltage bias for comparator(LM2903B) to the output of OPA2325(or OPA2376) as shown in attached file. A large value capacitor(1uF or more?) is needed for LM4041C, also connecting to the output of same Op-amp. Can this circuit will work? I would like to monitor over current by this circuit.
over current monitor circuit(01202021).pdf

Best Regards,
Fujiwara

over 3 years ago

0 Raymond Zhang1 over 3 years ago

TI__Mastermind 47796 points

Hi Fujiwara-san,

If the purpose is to obtain Vref voltage at approx. 3.75V (1.25+2.5) circled in red, the op amp buffer will be stable. The capacitor in series with OPA2325 should not affect the pole and the stability of the buffer.

We have wide selection of integrated current sensing and monitoring amplifiers, I am curious what are the reasons to design the circuit discretely.

https://e2e.ti.com/support/amplifiers/f/14/t/704915

Best,

Raymond

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OPA2325: question