NCP4354AADAPGEVB

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The NCP4354AADAPGEVB is an evaluation board designed for the purpose of enabling engineers to quickly evaluate the performance of the NCP4354A high voltage monolithic controller in flyback converters operating off-line. An industry-standard secondary-side synchronous rectification arrangement, often used in switch-mode power supplies (SMPS), is implemented with the integrated low-side and high-side MOSFETs. This arrangement helps to reduce power loss and improve efficiency.

The evaluation board can be used for a variety of applications such as computer monitors, LCD TV, and audio visual systems. It is designed to operate as a flyback converter operating from a rectified sinusoidal input voltage of up to 275VAC with output power up to 75W. It requires an input voltage range of 85-264VAC. In addition, it provides comprehensive digital control features like precise active voltage position control, over current protection and soft start.

The main components of the NCP4354AADAPGEVB evaluation board is NCP4354A high voltage monolithic controller, an auxiliary winding, an input power diode, and an input power capacitor. The input capacitor is rated for 275VAC and is connected to a primary winding of 20 turns. The output is a secondary winding with 30 turns and is connected to a rectifying diode. The output voltage can be adjusted by varying the turns in the auxiliary and secondary windings.

The NCP4354AADAPGEVB uses the NCP4354A monolithic controller to provide an on/off digital signal for the power MOS transistors. The on/off is controlled by the error amplifier which is connected to a comparator. This the error amplifier constantly monitors the output voltage and adjusts the duty cycle of the power MOSFET to maintain the desired output voltage. It further protects the device by providing overcurrent protection and overvoltage protection.

The NCP4354AADAPGEVB supports both standard and advanced market functions changes like adaptive dead time control, advanced current-mode control, and integrated fault protection, high common-mode voltage capability and an externally adjustable soft start. The board also provides a pre-set reference voltage for the short-circuit protections.

The high-side power FETs and low-side power FETs are enclosed in the same package for protection. It is constructed with a 30-turns primary winding and the secondary winding has 10 turns, allowing for an output voltage of up to 75W. The board is safety certified with UL and RoHS compliance.

In conclusion, the NCP4354AADAPGEVB is an evaluation board designed to evaluate the performance of the NCP4354A high voltage monolithic controller in flyback converters operating off-line. It provides digital control features like precise active voltage position control, over current protection and soft start. It supports both standard and advanced market functions changes like adaptive dead time control, advanced current-mode control, and integrated fault protection, high common-mode voltage capability and an externally adjustable soft start. It is safety certified with UL and RoHS compliance.

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