On Thu, Nov 06, 2003 at 06:39:20PM -0800, Miguel Venditto enlightened us
thusly
> Hello Declan, all this power supply with tda4601 work in burst mode,
> need some feedback from the pulse transformer to pin 9 through a
> diode, after start. Check electrolitic capacitor conected to pin 9,
> the voltage at this pin needed is +13,5v or more. Disconect all the
> loads in the secondary of the pulse transformer, and load only the +B
> to the flyback with 550 ohms aprox. 25 watts. If there is some short
> on secondary the voltage on pin 9 is aprox. 9volts. Also check
> resistor of high value connected from primary +B to pines 4 and 5. If
> the AC power is 220vca there are some elements that aren?t necessary
> (this are only needed for 110vca). I have a diagram with this ic, if
> you need, I can scan and send by email.
Thanks Miguel, but I have tha datasheet. I tried most of what you said
before I wrote the last mail. There's no point in unhooking the supplies
as the thing was being held off (=no 4V on pin 1). This is caused by a
low voltage on pin 9; So the output was never fired. There is a
circuit in the datasheet. The IC is eating a little extra current. I
have it working now I think.
--
With best Regards,
Declan Moriarty.
--
Author: Declan Moriarty
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