NCP1212DR2

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The NCP1212DR2 is a high performance Pulse Width Modulation (PWM) controller from ON Semiconductor. It is specifically designed for off-line AC-DC power supplies used in high quality home appliances, office automation, automotive, and industrial equipment. The NCP1212DR2 features user selectable Fixed Frequency or Burst Mode operation, which reduces the EMI filter requirement and lowers cost. This application field and its work principle will be introduced in the following sections.

Application Field for NCP1212DR2

The NCP1212DR2 is a highly integrated and configurable pulse width modulation controller that can be used in applications such as AC-DC power supplies in many home appliances, office automation, automotive, and industrial equipment. It is able to operate with different power topologies including flyback, half bridge, and forward converters, as well as boost (and buck or boost configurations). The NCP1212DR2 also boasts a wide input voltage range, which makes it suitable for both 220VAC and 110VAC applications.

The product is also designed to reduce overall system cost by optimizing space on the circuit board and eliminating unnecessary components in the power supply design. Additionally, it offers fixed frequency or burst mode operation, allowing it to minimize electromagnetic interference (EMI) and maintain a lower cost, due to the need for fewer EMI filter components. Finally, various protection features have been incorporated into the controller to ensure reliable operation over a wide range of environments.

Working Principle of NCP1212DR2

The NCP1212DR2 controller is based on an internal circuit that includes a current sense circuit, a voltage reference, an error amplifier, an oscillator, and a PWM comparator. The current sense circuit monitors the total output current, and the voltage reference sets the output voltage. The error amplifier compares the sum of the current and voltage signals, and generates a signal for the PWM comparator.

The PWM comparator compares the offset voltage between the error amplifier output and the oscillator’s triangular wave, and synthesizes a pulse width modulated signal. The integrated circuit is able to generate a very clean PWM signal that can be used to control and regulate the output voltage of a power supply, while keeping the output current constant.

The oscillator has user-selectable frequencies, and can be set to a desired level. If a Burst Mode operation is required, the oscillator can be configured to slow down at specified duty cycles, allowing lower standby current consumption. This feature also reduces the amount of switching noise generated by the power supply.

The NCP1212DR2 also features various protection features which make it suitable for a variety of application environments. This includes thermal protection, output overvoltage protection, and open loop protection. These protection features help ensure reliable operation for the product and the system.

Conclusion

The NCP1212DR2 is a high performance, highly integrated, and configurable pulse width modulation controller from ON Semiconductor. It is specifically designed for off-line AC-DC power supplies used in home appliances, office automation, automotive, and industrial equipment. The controller is able to operate with different power topologies and has wide input voltage range for both 110VAC and 220VAC applications.

The NCP1212DR2 features user-selectable fixed frequency or burst mode operation which minimizes electromagnetic interference and adjusts the EMI filter requirement. It also offers protection features such as thermal protection, output overvoltage protection, and open loop protection to ensure reliable operation.

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