Tool/software:
Hi Sir,
My customer is using OPA1622 for their audio driver application.
1. Please help to check if the schematic is ok.
2. Can we connect OPA1622's thermal pad to GND?
3. Can we usse the circuit to drive 300ohm load with +-5V power?
Thanks and regards,
Gary Teng
Hi Gary,
I am looking into this inquiry but I am having trouble with the circuit in Tina simulation. You can see below that all the amplifiers are railed out. I am not sure I understand yet the purpose of the second amp (U2 in my sim). Do you see a mistake in my connections?
2. Can we connect OPA1622's thermal pad to GND?
The thermal pad needs to be connected the most negative potential.
3. Can we usse the circuit to drive 300ohm load with +-5V power?
A 300 ohm load can be used. What is the power needed at the load? Is this for headphones?
Best Regards,
Chris Featherstone
1. Can't understand what the 2nd AMP is used for.
2. Can be, but the OPA1622 is very cool in most cases.
3. Easy. My DIY solution uses LM27762 with OPA1622 (one 27762 works for one OPA1622 parallel connection), the solution has good performance in my earphones, from 32ohm to 300ohm.
