Multi-topology PWM controller in wide 16-SOIC
The UC3867DW is a PWM controller from Texas Instruments that handles step-up/step-down conversion across full-bridge, half-bridge, and push-pull topologies. It drives external transistors via two outputs — typically a complementary high-side/low-side pair for bridge circuits. Switching frequency spans 50 kHz to 500 kHz, giving the designer room to trade off magnetics size against switching losses. The 100% maximum duty cycle is essential for push-pull and forward converters that need full on-time for transformer reset. Supply voltage range is 7 V to 22 V, compatible with common bias rails from auxiliary windings or regulated supplies. The built-in soft start limits output overshoot during power-up.
Commercial temperature grade and package fit
The wider body gives better creepage clearance for offline power supplies. Mounting is surface-mount; the supplier device package is 16-SOIC. Supplied in tube packaging — relevant for small-bench repairs or prototype runs where a full reel isn't needed. For larger volumes, check if tape-and-reel packaging is available through the supply channel.
No synchronous rectifier output, and clock sync is not supported — this is a standalone controller, not designed for multi-phase interleaving or external clock alignment.