What it is and where it fits
The Infineon ICE2QR0665ZXKLA1 is an offline flyback switching regulator from the CoolMOS™ and CoolSET™-Q1 series, integrating a 650 V breakdown CoolMOS power switch with a PWM controller in a single through-hole package. It delivers up to 79 W in isolated flyback topologies, switching at 52 kHz with a fixed 50% duty cycle. Typical applications include auxiliary power supplies for industrial systems, AC-DC adapters, and bias supplies in motor drives or home appliances where a compact, single-chip solution is needed.
Key ratings and what they mean for the BOM
The 79 W output power rating defines the transformer core size and the secondary-side rectifier selection. The 650 V breakdown voltage on the internal CoolMOS switch gives headroom for universal AC input with reflected voltage and leakage spike margin. The 52 kHz switching frequency is a standard sweet spot: high enough to keep the transformer small, low enough that a simple RC snubber on the drain node handles ringing without excessive loss. The 10.5 V to 27 V Vcc range allows the IC to run off an auxiliary winding or a small bias supply without an external linear regulator. Fault protections include current limiting, overload, over-temperature, and over-voltage — all integrated, so no external comparators or watchdog circuits are needed. The 18 V startup voltage ensures the IC stays off until the bulk capacitor charges sufficiently, preventing hiccup on brownout conditions.
Lifecycle and sourcing
The ICE2QR0665ZXKLA1 carries an Active lifecycle status with ROHS3 compliance. No end-of-life notice or last-time-buy window is in effect. For production BOMs, this part is suitable for new designs and ongoing volume builds.