1, TL494 features and functions
TL494 is a voltage-driven pulse width modulator produced by Texas Instruments. It can be used as a switching Power Supply circuit in system circuits such as displays and computers. The output transistor of TL494 can be connected into two modes: common emitter and emitter follower. Select double-ended push-pull output or single-ended output mode. In the push-pull output mode, its two driving pulses are 180 degrees out of phase, while in single-ended mode, the two driving pulses are in-phase in phase.
The internal functional block diagram of the TL494 is shown below:
1IN, 1IN-, 2IN, 1IN-input; FEEDBACK feedback; DTC dead time control; CT timing capacitor; RT timing resistor; GND ground; C1, C2 collector 1, 2; E1, E2 emitter 1, 2; Vcc Power supply; OUTPUT CTRL output control; REF reference.
2, the application circuit
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