Hi!
Currently I am using UC3526 for 40KHz PWM generation.
During testing, i had observed after power up for few seconds i am getting the output A & B but then it vanishes.
As per datasheet, I am geeting SYNC pulse on Pin-12, sawtooth wave shape on Pin-10, set 3.4V on Pin-1 with trim pot between Vref (pin-18) & ground (pin-15). RESET & SHUTDOWN (pin 5 & 8) are High. Rd=10 E on Pin 11 i had connected. Pin 2 & 3 are short. Pin 6 & 7 are short & connected to ground. On Pin 9, 3.6V measured w.r.t. ground.
Observation: Pin 4 Capacitor initially charge but after few seconds it discharge to 0V & along with that output pulses are also vansihes. As per my understanding from datasheet this capacitor is charged by internal current source & discharge under only RESET low condition. I had checked RESET pin is high. So how this capacitor gets discharged? If this capacitor hold the voltage then i am sure output will be there.
Awaiting your reply as soon as possible on this matter.