Low Power Output with TDA1562

pedopapa · 11th October 2005, 02:10 AM

I've recently built a car audio amp with a TDA1562 from Elektor. The diagram I used is this.
The problem is that I don't achieve the 50W RMS that I should get. Instead of that, when I lift the volume up, the LED starts blinking and I get a lot of distortion.

I've read another Thread about it (they say that I've to put Pin 16 to Vp) but no luck.

Thanks

Perry Babin · 11th October 2005, 05:02 AM

What it the B+ supply input voltage no load/output?

What is the B+ input voltage when driven hard?

What ohm load?

The chip is only rated for ~20 watts into 4 ohms continuously. The 50 watt rating is only for short term peaks. The lift capacitors will discharge relatively quickly. After they discharge, the max RMS unclipped output power is back to ~20 watts.

michal · 13th October 2005, 04:45 AM

Blinking diag LED most likely indicates clipping, see page 8 in the data sheet. You are either providing too much signal on the input or the chip is maxing out (weak power supply or it's just at its limit). That would be my guess.

Anyway, it's a 70W chip... but @ 10% THD.

sagarverma · 14th October 2005, 02:11 PM

reduce the gain to suitable values to avoid clipping.

11th October 2005, 05:02 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	What it the B+ supply input voltage no load/output? What is the B+ input voltage when driven hard? What ohm load? The chip is only rated for ~20 watts into 4 ohms continuously. The 50 watt rating is only for short term peaks. The lift capacitors will discharge relatively quickly. After they discharge, the max RMS unclipped output power is back to ~20 watts. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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13th October 2005, 04:45 AM	#3
michal diyAudio Member Join Date: Jun 2004 Location: Windsor, ON	Blinking diag LED most likely indicates clipping, see page 8 in the data sheet. You are either providing too much signal on the input or the chip is maxing out (weak power supply or it's just at its limit). That would be my guess. Anyway, it's a 70W chip... but @ 10% THD.

14th October 2005, 02:11 PM	#4
sagarverma diyAudio Member Join Date: Feb 2005 Location: NEW DELHI	reduce the gain to suitable values to avoid clipping.

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