The circuit shown in the schematic is a PWM signals based inverter circuit using a TL494 IC. This IC is commonly used for voltage regulation and switching applications like SMPS. The TL494 operates as a pulse width modulation (PWM) controller which generating switching signals to drive transistors Q4 and Q5.
The power supply described demonstrates the flexibility of the TL494 PWM control circuit. This power-supply design demonstrates many of the power-supply control methods provided by the TL494, as well as the versatility of the control circuit. The TL494 is designed to operate from an input voltage supply range between 7 V and 40 V.
Figure 1. TL494 Block Diagram The TL494 is a fixed-frequency pulse-width-modulation (PWM) control circuit. Modulation of output pulses is accomplished by comparing the sawtooth waveform created by the internal oscillator on the timing capacitor (C T) to either of two control signals.
The TL494 is a fixed−frequency pulse width modulation control circuit, incorporating the primary building blocks required for the control of a switching power supply. (See Figure 1.) An internal−linear sawtooth oscillator is frequency− programmable by two external components, RT and CT. The approximate oscillator frequency is determined by:
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