Pin 13, the Output Control, acts as a logic toggle. The circuit diagram shows this pin connected to the internal flip-flop. When Pin 13 is tied to the 5V reference, the internal flip-flop is enabled, and the output transistors (Pins 8, 9, 10, 11) alternate in a push-pull configuration—ideal for driving a center-tapped transformer. When Pin 13 is grounded, the flip-flop is bypassed, and the output transistors switch in parallel. This allows the diagram to reveal the chip's versatility: it can drive a single output stage or a double-ended output stage depending solely on this wiring configuration.
The TL494 is a monolithic integrated circuit designed by Texas Instruments. It is a PWM control circuit that can be used to control the output voltage of a switching power supply. The TL494 is a versatile IC that can be used in various applications, including: tl494 circuit diagram
: This pin determines the output mode. If grounded (low), the chip operates in single-ended mode (outputs in parallel). If connected to the 5V reference (high), it operates in push-pull mode (alternating outputs). TL494 Pulse-Width-Modulation Control Circuits Pin 13, the Output Control, acts as a logic toggle
: On-chip amplifiers allow for feedback control and output regulation by comparing the output voltage to a reference. Adjustable Oscillator When Pin 13 is grounded, the flip-flop is