NCP1240AD100R2G

The NCP1240AD100R2G from ON Semiconductor is a fixed-frequency current-mode controller specifically designed for flyback converter applications. This device operates with a frequency of 100kHz and supports a wide input voltage range from 9.3V to 28V.

Key features include timer-based overload protection with options for latched or auto-recovery operation, adjustable overpower protection dependent on bulk voltage, and a latch-off input. It also incorporates a high-voltage current source with brown-out detection and dynamic self-supply, simplifying VCC circuitry design. The controller offers frequency modulation for a softened EMI signature and a 10ms soft-start function.

With a duty cycle of 80% and a peak current capability of 500/800 mA, the NCP1240AD100R2G is suitable for various power supply designs. It includes internal thermal shutdown for protection and achieves low standby power consumption of less than 30 mW at no load. The component is housed in a 7-SOIC package and is designed for surface mount.

This controller is ideal for AC-DC adapters for notebooks, LCDs, and printers, as well as offline battery chargers and consumer electronic power supplies. Its robust design and integrated features make it a versatile choice for offline adapter designs.