I use 34063 to step down 12V to 5V, and use an oscilloscope to measure the 5V Vpp to be 416mV. Is this normal?

dianhang

I use 34063 to step down 12V to 5V, and use an oscilloscope to measure the 5V Vpp to be 416mV. Is this normal? [Copy link]

Use 34063 to step down 12V to 5V. Use oscilloscope to measure 5V Vpp as 416mV. Is it normal? The output Vpp of AMS1117-3.3 is 280mV. Is it normal? Schematic diagram 5V 3.3V

maychang

The size of the switching power supply output ripple is not only related to the components, but also to the layout (the arrangement of the component positions) and wiring (the arrangement of wires on the circuit board). The same circuit, the same components, different layouts and wiring, the ripple can differ by ten times.

elvike

Oscilloscope ripple measurement is also very particular

topwon

The key to measuring ripple is to use a spring ground wire loop to measure the voltage across the output filter capacitor (the 20M bandwidth limit must also be turned on, and the noise measurement seems to be turned off). Do not use the ground wire clip on the probe.