Help me please. Very low output. TDA 1562Q

[rtoma]

Hello,

thanks for reading this. I've build the attached schematic with the IC TDA1532Q. The output is very very low. My input comes from an portable mp3 player (low input). And the output is very very very low. What can I do? Thank you!

 

[TO-3]

Looking at the data sheet for the chip, it looks as if the input and/or output is being muted by the chip. Try tying pin 16 high and see if it makes your problems go away. Also, do you have the chip on a heat-sink?

 

[rtoma]

Hello,

I would like to thank you at first for answering me. I appreciate that (really!).

1) I have my chip on a heat-sink
2) Because of my bad english and/or of my poor electronics knowledge I don't understand what you mean with "Try tying pin 16 high and see if it makes your problems go away". I also looked at the datasheet and I find:

Status I/O STAT (pin 16)
PIN STAT AS INPUT

Vst input voltage 0 - VP V
IstH HIGH-level input current VSTAT = 14.4 V - - 4 mA
IstL LOW-level input current VSTAT = 0 V - - -400 mA
Vth1+ threshold voltage fast mute ® class B - - 2 V
Vth1- threshold voltage class B ® fast mute 1 - - V
VstH1 hysteresis ï(Vth1+ - Vth1-)ï - 200 - mV
Vth2+ threshold voltage class B ® class H - - 4.2 V
Vth2- threshold voltage class H ® class B 3.3 - - V
VstH2 hysteresis ï(Vth2+ - Vth1-)ï - 200 - mV

What I also do NOT understand.

Does that mean, that, if it is muted I should apply 2 volts to it (to pass from fast mute -> class B, or 4.2 volt to pass it from class B-> class H? What does that mean:

IstH HIGH-level input current VSTAT = 14.4 V - - 4 mA
IstL LOW-level input current VSTAT = 0 V - - -400 mA

What is a high-level input? And a low-level input?

Thanks a lot!

Sincerly,

Ricardo Toma

 

[TO-3]

Hello,

I would like to thank you at first for answering me. I appreciate that (really!).

1) I have my chip on a heat-sink
2) Because of my bad english and/or of my poor electronics knowledge I don't understand what you mean with "Try tying pin 16 high and see if it makes your problems go away". I also looked at the datasheet and I find:

Status I/O STAT (pin 16)
PIN STAT AS INPUT

Vst input voltage 0 - VP V
IstH HIGH-level input current VSTAT = 14.4 V - - 4 mA
IstL LOW-level input current VSTAT = 0 V - - -400 mA
Vth1+ threshold voltage fast mute ® class B - - 2 V
Vth1- threshold voltage class B ® fast mute 1 - - V
VstH1 hysteresis ï(Vth1+ - Vth1-)ï - 200 - mV
Vth2+ threshold voltage class B ® class H - - 4.2 V
Vth2- threshold voltage class H ® class B 3.3 - - V
VstH2 hysteresis ï(Vth2+ - Vth1-)ï - 200 - mV

What I also do NOT understand.

Does that mean, that, if it is muted I should apply 2 volts to it (to pass from fast mute -> class B, or 4.2 volt to pass it from class B-> class H? What does that mean:

IstH HIGH-level input current VSTAT = 14.4 V - - 4 mA
IstL LOW-level input current VSTAT = 0 V - - -400 mA

What is a high-level input? And a low-level input?

Thanks a lot!

Sincerly,

Ricardo Toma

Connect pin 16 to the 12 ~ 14V supply. It will need 4mA of current. When 16 is low (0 Volts), it will produce 400uA which should probably be terminated to ground via a resistor.

 

[rtoma]

The attachment...