TL494 Pulse-Width-Modulation Control Circuits

TL494 incorporates all functions required to construct a PWM pulse width modulation control circuit. It is best designed primarily for power-supply control, especially switching converter such as buck, boost and buck-boost. TL494 contains two error ampliers, adjustable oscillator, a dead-time control comparator, a pulse-steering control flip-flop, a 5-V, 5%-precision regulator, and output-control circuits.The error amplifiers exhibit a common-mode voltage range from –0.3 V to VCC – 2 V. The dead-time control comparator has a fixed offset that provides approximately 5% dead time. The on-chip oscillator can be bypassed by terminating RT to the reference output and providing a sawtooth input to CT, or it can drive the common circuits in synchronous multiple-rail power supplies. The uncommitted output transistors provide either common-emitter or emitter-follower output capability. The TL494 device provides for push-pull or single-ended output operation, which can be selected through the output-control function. The architecture of this device prohibits the possibility of either output being pulsed twice during push-pull operation.

The TL494C device is characterized for operation from 0°C to 70°C. The TL494I device is characterized for operation from –40°C to 85°C.

Product Category:	Switching Controllers
Topology:	Boost, Buck, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull
Number of Outputs:	2 Output
Switching Frequency:	300 kHz
Duty Cycle - Max:	45 %
Output Voltage:	40 V
Output Current:	200 mA
Maximum Operating Temperature:	+ 70 C
Mounting Style:	Through Hole
Package / Case:	PDIP-16
Packaging:	Tube
Fall Time:	40 ns
Minimum Operating Temperature:	0 C
Operating Supply Voltage:	15 V
Rise Time:	100 ns

Documents:

- [Datasheet](http://www.ti.com/lit/ds/symlink/tl494.pdf)