Multi-topology current-mode PWM controller for isolated and non-isolated supplies
The UCC28C41DGK from Texas Instruments is a current-mode PWM controller that supports boost, flyback, and forward converter topologies — a single part number covers the three most common architectures in off-line and DC-DC supplies up to 1 MHz switching frequency. With a supply range of 6.6 V to 18 V and a maximum duty cycle of 48%, it targets single-ended topologies where the output is regulated from the primary side and the transformer reset happens during the off-time.
Switching frequency and duty-cycle limits govern transformer design
The 1 MHz switching ceiling lets you shrink the magnetics — a flyback transformer at 500 kHz is roughly half the core cross-section of one running at 100 kHz — but the 48% max duty means the off-time is always longer than the on-time, which sets the turns ratio and reset voltage in a forward converter. The single transistor-driver output with positive configuration drives an external N-channel MOSFET directly; there's no synchronous rectifier output, so the secondary-side rectification is handled by a Schottky or ultrafast diode.
Active lifecycle and compliance documentation
RoHS3 compliant per the current TI declaration; no exemptions that would flag it for restricted markets.