TL494IDR

TL494IDR is the tape-and-reel SOIC-16 ordering code for the Texas Instruments TL494 pulse-width-modulation control circuit, listed as ACTIVE; the I in the code is the industrial temperature grade, -40 °C to +85 °C, against 0 °C to 70 °C for the commercial code. TI’s own headline figures for the device: 40 V, 0.2 A, 300 kHz PWM controller, with a maximum duty cycle of 45 % typical per output under the datasheet’s push-pull test conditions (dead-time control at zero, CT of 0.01 µF, RT of 12 kΩ, at 25 °C), an internal 5 V reference held to ±5 % tolerance, two error amplifiers, dead-time control, and uncommitted output transistors rated 200 mA that can be strapped for single-ended or push-pull operation. The selection point is the complete PWM control block on one chip for off-line and DC/DC supplies built on this architecture: oscillator, reference, error amplifiers and pulse steering without an external control-loop build-up. Selection advice: the 45 % duty-cycle figure is a typical value tied to the output mode and the timing components, not a guaranteed cap for every configuration — check the mode (single-ended or push-pull) and the CT/RT values in your design, and treat the 5 % reference tolerance as the hard limit it is. Parameters verified against the TI TL494 datasheet SLVS074 (§5.9, maximum duty cycle row and its test conditions) and the TI product page.