Hi,
//
I used TL497A to design a voltage booster (12 volts to 18 volts / 350 mA).
Based on the datasheet, I used L=470uH, Ct=470pf, TIP122 darlington NPN transistor for power switching, 0.38 ohm/1W limiter resistor, 300uF filter capacitor and 3A Fast Diode.
Sometimes it show Short Circuit when start-up (turn on board) and destroy Resistor or IC.
Output is about 200mA @ 18volts.
Also, I hear some noise from 470uH Inductor when circuit is on.
I will be appreciated with your comment & suggestion for troubleshooting.
Best Regards,
Navid Navid
//
I used TL497A to design a voltage booster (12 volts to 18 volts / 350 mA).
Based on the datasheet, I used L=470uH, Ct=470pf, TIP122 darlington NPN transistor for power switching, 0.38 ohm/1W limiter resistor, 300uF filter capacitor and 3A Fast Diode.
Sometimes it show Short Circuit when start-up (turn on board) and destroy Resistor or IC.
Output is about 200mA @ 18volts.
Also, I hear some noise from 470uH Inductor when circuit is on.
I will be appreciated with your comment & suggestion for troubleshooting.
Best Regards,
Navid Navid