ON Semiconductor NCP1217D100R2G PWM Current-Mode Controller

The NCP1217D100R2G is a high-performance, fixed-frequency pulse-width modulation (PWM) current-mode controller designed by ON Semiconductor for a diverse range of power conversion applications. This versatile integrated circuit is specifically engineered to address the stringent requirements of AC-DC power supplies, particularly in the realm of off-line converters used in adapter, open-frame, and set-top box power supplies.

With a fixed frequency operation at 100kHz, the NCP1217D100R2G provides a stable switching frequency that greatly simplifies the design of the EMI filter. The device integrates a host of features that enhance system reliability and performance, such as an adjustable skip-cycle capability that improves the efficiency at light loads, thereby reducing power consumption when the demand is low.

The NCP1217D100R2G also boasts built-in frequency jittering, which helps to spread the electromagnetic interference (EMI) over a wider spectrum, significantly reducing the EMI filtering costs. This feature is particularly useful in applications where EMI regulations are strict and system cost is a critical factor.

Another key attribute of this controller is its internal ramp compensation, which improves the large signal stability and ensures reliable operation under a wide range of load conditions. The NCP1217D100R2G also incorporates a high-voltage startup circuit, enabling the device to quickly power up and regulate the output voltage without the need for an additional external circuitry.

Protection features are paramount in power supply design, and the NCP1217D100R2G does not disappoint. It includes an auto-recovery overvoltage protection (OVP), which safeguards the circuit against excessive voltage conditions. Additionally, the built-in overcurrent protection (OCP) utilizes cycle-by-cycle control, preventing the power supply from delivering excessive currents that could potentially damage the end application or the power supply itself.

Offered in a compact SOIC-7 package, the NCP1217D100R2G is optimized for space-constrained applications while providing the flexibility and robustness required for modern power supply designs. This product exemplifies ON Semiconductor's commitment to providing energy-efficient and reliable solutions for electronic systems worldwide.