Just to focus the search, what does it DO?
Where is it?
Power supply?
Power amp?
Relay driver?
In which Amp/Preamp?
What voltages do you read on its pins?
TP3 and TP5 are indicated, what are you supposed to read there
Is there any user/service manual or schematic available?
Where is it?
Power supply?
Power amp?
Relay driver?
In which Amp/Preamp?
What voltages do you read on its pins?
TP3 and TP5 are indicated, what are you supposed to read there
Is there any user/service manual or schematic available?
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Perhaps go around all the pins with a scope and DVM and try and identify things such as supply and clock/data.
It could be something like NVM memory or a reset generator or... anything.
It could be something like NVM memory or a reset generator or... anything.
This is for an Alpine car audio amplifier (class D).
No service manual is available (strange for Alpine).
It it near the outputs. Terminals 5-8 read 1 ohm but the board (from the angle of the photo) doesn't seem to have all of those connected.
ST EZ842 is what we were using for the search.
The OP for the thread now thinks it may be an ISL6744. If anyone has any other suggestions, please post them.
No service manual is available (strange for Alpine).
It it near the outputs. Terminals 5-8 read 1 ohm but the board (from the angle of the photo) doesn't seem to have all of those connected.
ST EZ842 is what we were using for the search.
The OP for the thread now thinks it may be an ISL6744. If anyone has any other suggestions, please post them.
It could be fake Alpine, stranger things have happened.
So back to basics, will have to work out from the application note of the amplifier chip what it is actually, and its function, and possible substitutes.
If the search going to Ali Express, it tells me that this chip has little sale in the West, or is a fake, which is another can of worms.
Renesas ISL6744 is a PWM power supply controller in the same SMD type package, so why did the OP post a picture of another device?
Confusing...
So back to basics, will have to work out from the application note of the amplifier chip what it is actually, and its function, and possible substitutes.
If the search going to Ali Express, it tells me that this chip has little sale in the West, or is a fake, which is another can of worms.
Renesas ISL6744 is a PWM power supply controller in the same SMD type package, so why did the OP post a picture of another device?
Confusing...
Could very well be a 211 from the pin out. If near the output, could be for current or offset voltage sensing. See what pins 2 and 3 connect to - if it goes to a sense resistor or current transformer you have your answer. Also, if it is a comparator, pin 7 would control *something*. I can’t see where it goes - probably the other side of the board.
#6:
The photo I posted was one from a 2000 that I repaired. His amp has the same ICs.
Alpine has had at least one class D driver specially made so this one (with this part number) might not be commercially available.
I've seen a fake Alpine amp so I know they exist but this amp is absolutely top quality.
The ISL6744 was something that he found. I'm waiting on him to reply to more questions to try to nail down the likely pin configuration.
#7/8:
It could be. The 211 is used quite a bit as a comparator to square up the drive signal in a lot of car amps but the amps that use it are not like the design of this amp.
The photo I posted was one from a 2000 that I repaired. His amp has the same ICs.
Alpine has had at least one class D driver specially made so this one (with this part number) might not be commercially available.
I've seen a fake Alpine amp so I know they exist but this amp is absolutely top quality.
The ISL6744 was something that he found. I'm waiting on him to reply to more questions to try to nail down the likely pin configuration.
#7/8:
It could be. The 211 is used quite a bit as a comparator to square up the drive signal in a lot of car amps but the amps that use it are not like the design of this amp.
Ask for clear photos of the PCBs, both sides.
As a technical person, it will be more easy to assess the articles requiring attention.
And if it was specially made, and it is old, then you have a problem.
Another point is that almost every reputed chip maker has published data sheets, and they are available from different sites, apart from the maker's site.
It is possible to find the old ST data sheets for the TDA 2050, last made about 1998 by ST, and the sheet now has a watermark saying 'discontinued' or 'obsolete', or similar....but it is available.
This chip has no digital history on the Internet, so to speak, so it is either custom made or a fake.
As a technical person, it will be more easy to assess the articles requiring attention.
And if it was specially made, and it is old, then you have a problem.
Another point is that almost every reputed chip maker has published data sheets, and they are available from different sites, apart from the maker's site.
It is possible to find the old ST data sheets for the TDA 2050, last made about 1998 by ST, and the sheet now has a watermark saying 'discontinued' or 'obsolete', or similar....but it is available.
This chip has no digital history on the Internet, so to speak, so it is either custom made or a fake.
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