Tl494 Switching Power Supply Schematic

See figure 1 an internal linear sawtooth oscillator is frequency programmable by two external components rt.

Tl494 switching power supply schematic.

Figure 1 is a block diagram of the tl494. How to use ic tl494. Designed primarily for power supply control this device offers the flexibility to tailor the power supply control circuitry to a specific application. This power amplifier circuit can be supplied with 30v to 100v dc asymmetric power supply using 8vdc bias voltage up to 12vdc.

The design of the tl494 not only incorporates the primary building blocks required to control a switching power supply but also addresses many basic problems and reduces the amount of additional circuitry required in the total design. The tl494 ic is designed in such a way that it not only features the important circuitry needed to control a switching power supply but additionally tackles several fundamental difficulties and minimizes the need of supplemental circuit stages. The tl494 device incorporates all the functions required in the construction of a pulse width modulation pwm control circuit on a single chip. Here we modify some part replace current sensing to use hall effect sensor chip acs712elctr 3 5 instead of sensing resistor.

For this demonstration the circuit is constructed on a homemade pcb with the help of the schematic and pcb design files please note that if a big load is connected to the output of the transformer a huge amount of current will flow through the pcb traces and there s a chance that the traces will burn out. 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. The schematic diagram is based on the design case presented in the reference designing switching voltage regulators with the tl494 texas instruments application report. To make this power amplifier please see the circuit schematic of tl494 power amplifier below along with pcb layout design.