onsemi AC DC Converters, Offline Switches NCP1253ASN100T1G

The NCP1253ASN100T1G is a current-mode PWM controller designed for offline power supplies, packaged in a compact TSOP-6 format. It operates at a fixed frequency of 100 kHz and can handle supply voltages up to 28 V. The controller features frequency foldback down to 26 kHz and skip-cycle operation under light load conditions, enhancing efficiency. It includes adjustable ramp compensation to prevent sub-harmonic oscillations during continuous conduction mode (CCM) operation. Protection mechanisms include an auto-recovery timer for short-circuit protection and a latched over-voltage protection (OVP) on the VCC pin, safeguarding the circuit against faults. The device is optimized for low no-load standby power consumption and is compliant with Pb-free standards. Typical applications include AC-DC converters for televisions, set-top boxes, printers, and offline adapters for notebooks and netbooks.