Replacement for STK4192 II

[sifuconman]

Hi,

My current amplifier is using STK4192 II but it is damaged now. Can I replace the STK4192 II with a STK4191 II which is available on the market ?

What is the difference between STK4191 II and STK4192 II ?

 

[mjf]

hello.
they seem to be very similar.perhaps the 4191 is only for use with 8 ohm speakers.

STK4192II Datasheet pdf - AF Power Amplifier (Split Power Supply) (50W + 50W min, THD = 0.4%) - SANYO

 

[IndAudio]

Both are pin-to-pin compatible and have very little differences. You can replace a 4192 with a 4191 without any worries.
The only difference is in THD rating which depends on the mark like mark II, V, X etc and minor changes in the internal circuitry and supply voltage leves (4191 -53v against 4192 -52.5).

 

[sifuconman]

stk voltage

Hi,

Does any one know what should be the normal working voltages on pin no 12 of STK4192 if the supply voltage +vcc is 37 v and -vcc is -37 v ?

The voltage I measured on pin no 12 is almost zero. Is it normal ? If not normal then what could be the problem ?

Thanks

 

[Mooly]

Just looked at the data sheets for a 4192 and a 4191 and they are certainly not pin compatible.
I am using,
Datasheet catalog for integrated circuits, diodes, triacs, and other semiconductors, view

The 4192 should have a voltage on pin 12 similar to that on pin 11. They may even be joined on the PCB. These are the main supplies to the amp so around 35 to 50 volts depending on what the map runs on,

 

[sifuconman]

Thanks. I guess my STK 4192 is faulty. Need to change. One more question though - do we need to use an insulator between the heat sink and STK 4192 if the heat sink is grounded ?

 

[Mooly]

Never seen insulators used on commercial gear. Pin 16 is shown as "ground" so I'm guessing that connects to the metal back plate which may or may not be "grounded".

The IC probably is duff and may have blown circuit protectors (fuses etc) in the PSU, hence no supply on pin 11 etc.