pete16
Junior Member level 1
Hello,
I have used the MC34063 to build a circuit to output 18V 100ma from 12 V input and used an electronic load to test in constant current mode of 100ma.
It is fine when my load draws 100ma it works and the output is 18V as designed.
However, when I lower the current draw to below 100ma the output voltage starts to go up to 21V and if the load draws below 40ma the output Voltage oscillates between 18V and 22V.
Any ideas what is going on? How come it voltage oscillates when the output load draws less than 100ma?
I though this was supposed to keep voltage constant at 18V for anything UP TO 100ma.
Thanks
I have used the MC34063 to build a circuit to output 18V 100ma from 12 V input and used an electronic load to test in constant current mode of 100ma.
It is fine when my load draws 100ma it works and the output is 18V as designed.
However, when I lower the current draw to below 100ma the output voltage starts to go up to 21V and if the load draws below 40ma the output Voltage oscillates between 18V and 22V.
Any ideas what is going on? How come it voltage oscillates when the output load draws less than 100ma?
I though this was supposed to keep voltage constant at 18V for anything UP TO 100ma.
Thanks