NCP1216P100G

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The NCP1216P100G is a current-mode PWM controller, specially designed for an offline forward converter. It offers current-mode enhanced with improved stability and jitter performance, allowing the use of low-ESR output capacitors. Featuring low start-up current and millisecond soft-start, this power switch is capable of delivering up to 1A output current.

The NCP1216P100G application fields are mainly used for off-line applications, such as AC/DC internet routers, Ethernet switches, and hot-swap control circuits. The device features a built-in VDD regulator to support integrated gate drivers and reduced external parts count. It also provides valuable features such as skip-cycle operation and VN/VP under-voltage protection to comply with the IEC-60950 standard.

The NCP1216P100G working principle is mainly based on the maintop-mode current-mode control. The output current is monitored via a current sense resistor connected between the drain and source of the main power switch. An internal oscillator is used to switch the power switch at a fixed frequency. The maximum duty cycle value is regulated either by the voltage or current of the error amplifier. In the latter method, the frequency is regulated through the control PWM pin.

Enhanced features such as overload protection are also provided. The device also supports skip-cycle operation to reduce the no-load power consumption. The NCP1216P100G is designed to meet the stringent safety requirement demanded by IEC-60950 and UL-1950.

To sum up, the NCP1216P100G is a current-mode PWM controller offering enhanced current-mode control, low-start up current and millisecond soft-start. It is ideal for offline forward converters needed for AC/DC internet routers, Ethernet switches, and hot-swap control circuits. The device features overload protection, skip-cycle operation, and meets the stringent safety requirement demanded by IEC-60950 and UL-1950.

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