NCP1203D40R2G

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The NCP1203D40R2G is part of the Line of ON Semiconductor’s (formerly Motorola’s) family of integrated monolithic switcher Integrated circuits. NCP1203D40R2G is specifically designed as an offline switcher to implement an AC-DC (Alternating Current to Direct Current) flyback converter. The main application of an NCP1203D40R2G is to provide an efficient and low cost solution for low power AC-DC converters.

NCP1203D40R2G is a Pulse Width Modulated (PWM) switcher controller, which provides the power control and regulation for flyback converters with Primary Side Regulation (PSR). This topology provides significant advantages over other topologies such as Resonant Converter, Off-Line Buck or Buck-Boost converters. The integrated circuits incorporate a number of features specifically designed to reduce overall system costs and to reduce the design cycle.

NCP1203D40R2G consists of four major blocks, which include the active burst mode, an extended frequency range oscillator, a low quiescent current error amplifier and a pulse width modulator (PWM). The integrated circuits provide the ability to operate at operating frequency ranges from 50kHz to 2.5MHz. The active burst mode is used to control the average current for the flyback converter and is fully adjustable through external components.

The extended frequency range oscillator adapts its oscillation frequency to maintain a constant output power over the specified AC line ranges. The oscillator can also be synchronized to an external frequency to reduce EMI emissions. The integrated IC uses power on detection (POD) to start up the switching circuit, and can detect secondary output voltage to go into dual mode for protection.

The fully integrated low quiescent current error amplifier of the NCP1203D40R2G includes several important features such as reference compensation, feedback clamp, overvoltage protection, output current limitation and soft start. The error amplifier also incorporates a programmable peak current limit, which can be connected to the pin VLIMI to protect the external MOSFET. The PCL is adjustable through an external resistor.

Finally, the integrated IC includes a PWM module, which controls the switching waveforms of the flyback converter based on the reference and the feedback signals.The PWM waveform also includes several additional features such as time base, comparator hysteresis and slew rate of the PWM signal, which are adjustable through external components. The product also incorporates internal soft start functionality to limit the input current inrush and to reduce the stress on the power components.

In conclusion, the NCP1203D40R2G is an ideal choice for the design of low cost, low power AC-DC flyback converters and provides significant advantages over other topologies such as Resonant Converter, Off-Line Buck or Buck-Boost converters. Its various features such as PWM signal waveform control, Peak Current Limit, Soft Start, Power On Detection and Dual Mode ensure high reliability and performance.

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