Part Number: TLV9002
Dear TI experts: My custom use lm358 for current detcet, however the product stand-by current was over limit.so he consider use SG Mirco SGM2358 and TI TLV9002 replace.compare both parameter, tlv9002 are all beter than competitors, But unfortunately the product stand-by current worse than competitors.i was puzzled, the PCB are all the same, only p2p replace the amplifier. TLV9002 Stand-by current: 4.86mA;SGM2358 Stand-by current:4.45mA.sch as following, the parameter can be optimization? thanks
Over 4mA for this circuit seem very high. Is the current for the whole application (that includes more circuitry)?
By standby, do you mean no input signal? If standby could be replaced by shutdown mode, that would help reduce the current draw by a lot.
Regards,Ronald MichallickLinear Applications
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In reply to Ron Michallick:
The typical currents per amplifier in the datasheet is LM358 = 300uA, SGM2358 = 400uA, TLV9002 = 60uA
TLV9002 is the clear winner here. Yet, the measurements show otherwise. Is this repeatable?
My guess is below as I don't know the actual voltages of any node other than the 5V supply (which is also assumed).
<guess>If SGM2358 had a negative input offset error then the 0mV input would make output railed low, both outputs in fact. If an output rail low state causes the SGM bias current to drop dramatically then its quiescent could in theory be lower. A positive offset device would have a not zero 1st amplifier and all the current savings will be lost <\guess>
In my experience some op amps have odd behavior (like bias current change) when used in "comparator mode", any nonlinear state. I don't know if that is the case here. Try adding a little negative bias to pin 6 (via a resistor) to get pin 7 higher than ground. Then check supply current again.
yes ,it can repeatable.custom use the op amps in "comparator mode", can you give me more clean advice to improve the parameter.or tlv9002 is the right part for this suitation. thanks
In reply to user6187612:
My best and easiest method to understand is to unsolder and lift pin 8 of the op amp for both designs and place a current meter between the 5V supply and pin 8 to see how much really flow through the op amps.
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