SOIC-8 flyback controller with 75 W ceiling
The NXP TEA1738T/N1,118 is a GreenChip flyback controller in an 8-SOIC package, rated for 75 W output with an 80% maximum duty cycle. Switching frequency spans 26.5 kHz to 78 kHz, giving the designer flexibility to balance transformer size against EMI filter cost.
Fault protection set and supply rail
Built-in fault protection covers current limiting, over-power, over-temperature, and over-voltage — the controller shuts down or folds back before the MOSFET or transformer sees a hard fault. Start-up threshold is 20.6 V; the Vcc operating range is 12 V to 30 V, so the bias winding must deliver at least 12 V under all load conditions to keep the controller running. Output isolation is rated as isolated, meaning the feedback loop crosses the isolation barrier — typically via an optocoupler and a TL431 reference on the secondary side.
Board-fit note for the 8-SOIC
Surface-mount assembly with a 150 °C junction rating means the part suits reflow soldering; the -40 °C to 150 °C junction range covers industrial and some automotive underhood applications (though no AEC-Q grade is stated).
Active lifecycle and compliance
RoHS3 compliant per NXP's declaration, with no exemptions listed.