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LM1875: Output issue under high temperature test

Tendo Sakaue
Prodigy 10 points

Part Number: LM1875

LM1875T/NOPB

Actually, we want to ask a question about LM1875 specification. Please support.

We try to design speaker amplifier with specification as below:

- Power Output : 20 W

- ±B Voltage     : 25V

- Load                    : 4 Ω

 

Unfortunately, when we implement temperature rise test, the Output of Power is running OFF and ON repeatedly.

At those time, we set the Output to 12W (Vo=7V, R=4Ω).

And the temp rise is about 88℃ at LM1875’s case (die).

 

We check to your specification, at thermal protection mentioned that LM1875 will shut down when the temp rise reaches 170℃. 

For the matter, please teach us the detail of proper usage of LM1875 IC.

Please support and thank you.