Push-pull PWM controller at 194 kHz
The Texas Instruments UCC2808AD-2 is a current-mode PWM controller designed for push-pull topology in step-up or step-down converter applications. It operates at a fixed 194 kHz switching frequency and delivers two transistor-driver outputs with a maximum duty cycle of 49% per output — the hard limit that prevents transformer saturation in push-pull stages. The supply range spans 4.1V to 15V, covering common bias rails from 5V to 12V without an extra regulator. Housed in an 8-SOIC surface-mount package, it is rated for the industrial temperature range of -40°C to 85°C.
49% duty cycle — why it matters for the transformer
The 49% maximum duty cycle per output is the defining parameter for push-pull design. Exceeding 50% risks flux imbalance and transformer core saturation. With two outputs running complementary phases, the effective duty cycle seen by the transformer is the sum of both outputs, but each leg stays below the 50% cliff. This part enforces that limit internally, so the layout engineer sizes the primary inductance and reset winding around a 49% on-time at 194 kHz.
Active and available — no LTB risk
The UCC2808AD-2 carries an active lifecycle status with ROHS3 compliance.
8-SOIC package — rework and footprint notes
The 8-SOIC (0.154", 3.90 mm width) package is a standard surface-mount footprint that reworks cleanly under hot air. Tube shipping medium is the default, but the part is also available in tape-and-reel variants under alternate order codes if the pick-and-place line needs reel feed. No special bake requirements beyond standard MSL handling.