Hello~
I’m a novice,and I want to ask for some advice about the boosted circuit based of MC34063A. ( the datasheet of MC34063A )
The inputted voltage is 5V when the output is 30V, current is 70mA and the oscillation frequency is 33K.
The diode I chose is IN5819(SS14)
timing capacitor /Ct=1047 pF
peak current Ipk=1029 mA
current-limiting resistance /Rsc=0.292ohm
electrical inductance /Lmin=102 uH
filter capacitor /Co=33 uF
R=180 Ohm
R1=2.7k R2=62k (29.95V)
I don’t know why the texting output voltage is more than 29V after I built the circuit. But quickly the voltage will be pull down. As a matter of fact,the current is just about 10mA. And the MC34063 was so hot.
Could anyone help me out? Thanks a lot.
Recent comments