The Ultimate Guide to TL494: Pulse Width Modulation (PWM) Circuit Design
: The timing of the circuit is determined by an external resistor ( cap R sub cap T ) and capacitor ( cap C sub cap T tl494 circuit diagram
Controls the maximum duty cycle. Applying a small voltage (0V to 3.3V) limits the "on" time to prevent transformer saturation. The Ultimate Guide to TL494: Pulse Width Modulation
The frequency is set by ( R_T ) (pin 6) and ( C_T ) (pin 5): tl494 circuit diagram