What are ways to read ir2153 output if it is oscillating


New member
Can someone tell me how I can use digital multimeter to test the ir2153 if it is oscillating, my smps I tried to design when I put DMM black probe on the negative power line and the positive of the DMM probe to the pin 7 of the ic it read 15 volt no fluctuations and the pin 5 read 0.45 volt question is is that how it should be? Or how do I know if it is oscillating I don't have oscilloscope or frequency meter thanks to all the genius in the house


New member
Since it is 50% duty cycle you must measure half the voltage from the ir2153 supply voltage with a cheap multimeter, or 100% input voltage with a true rms multimeter. Other way is to connect 2 LEDs with a proper resistance and lower down the frequency so you can see the blinking between the LEDs. With a high oscillation frequency that will be impossible to see.