TCA785 phase control ic

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Alvin24

Joined Feb 11, 2009
2
i can't get the control voltage (V11)from pin 11 in the straight line waveform when i connected the as the datasheet given. The synchronization voltage (V5) and the Ramp voltage (V10) i can get it as the datasheet stated . But the Control voltage (V11) i cant get it asstraight line as the data sheet stated. Which point i need to check for my circuits ?? HELP PLS... URGENT:confused: as the project due date is closer. Thanks :)
 

bertus

Joined Apr 5, 2008
22,270
Hello,

Wich schematic did you use?
There are several in the datasheet.
Here is the first example:



I have worked with the chip several times.
Most times I had problems with the resistor Rsync, this must have enough power.
I lately replaced them with 2X 470K, 1/4 Watt in parallel.

Greetings,
Bertus
 

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