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Registered Member #2288
Joined: Wed Aug 12 2009, 10:42PM
Location: Cambridge, MA
Posts: 179
I'm making a basic h-bridge oscillator for switching up to 220V based on the IRS2453 chip. I have built the whole circuit but it doesn't seem to be oscillating or doing anything really. The Output shows no DC or AC voltage and no frequency on my meter. Is there anything wrong in my circuit design? This is the first time I made a circuit of this type. There is 15.1V DC at the power pins 1 and 2 of the IC.
MOSFET's are 44N50.
One thing I'm not positive about is what to do with the pin 5 on the chip which is currently not attached to anything. It's the shutdown pin and there seems to be minimal documentation on it in the datasheet.
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
The datasheet says "When the SD pin is brought above 2 V, the IC goes into fault mode and all outputs are low. VCC has to be recycled below VCCUV- to restart the IC."
So if it ever triggers the chip will not work again until you turn the power off and back on again. Connect SD to pin 2 (COM) to make sure it does not shut down and see if that helps.
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
stress wrote ...
can you please tell me what is the value of c7 and c8 for an 50Hz output?
Welcome. I didn't expect it would go down to 50 Hz, but the datasheet (first result of a Google search for IRS2453) has formulas and charts that go that far. Would love to hear more about your project.
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H-Bridge Oscillator Debugging
