NCP1377P

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NCP1377P is a non-synchronous boost and buck converter in a CMOS Power IC, designed to provide an efficient, low cost solution to off-line or battery supply system. It has built-in protections such as over-current protection, over-temperature protection, over-voltage protection, and reverse voltage protection to ensure safe operation.

It is adopted by many companies because if its multiple integrated features, such as high efficiency, low current consumption, and low ripple. For example, the NCP1377P is used by Top Oil to increase its efficiency and reduce the amount of heat being generated by its oil refinery equipment.

Application field

The main application field of the NCP1377P is in AC/DC converters, especially for low power applications such as chargers and standby power supplies. Moreover, it is also suitable for high power applications, such as server power supplies, solar inverters, and UPS systems.

It can support wide input voltage range, and provides 18V/0.25A to 48V/3.5A output voltage at high efficiency level. Furthermore, the output voltage adjustment capability allows the power output to be adjusted both remotely and manually.

Working Principle

The NCP1377P works on the principal of changing the voltage of the input power supply. It does this by using a switching circuit to increase or decrease its voltage as desired. This is done by a PulseWidth Modulation (PWM) technique. In the boost mode, the buck switch is closed and the current passes through the transformer winding to increase the voltage, while in the buck mode, the boost switch is closed, and the current is diverted through a diode to reduce the voltage.

The NCP1377P also has the ability to switch between buck and boost mode automatically, depending on the input voltage and output voltage. This is done by using an on-chip switching control chip, which can sense the input voltage and output voltage, and will adjust the on-time of the drive signals accordingly. This allows the circuit to maintain a constant output voltage without any manual intervention or additional components.

The NCP1377P also has optional features such as over-voltage protection, under-voltage protection, and over-temperature protection. These features are enabled by an external resistor and diode, which help to prevent any potential damage that can occur due to higher voltage, lower voltage, and/or higher temperature.

The NCP1377P also has internal protections which guarantee its safe operation. For example, it has an in-built current limit feature, which will limit the output current by increasing the internal resistance and thus protect the applicance connected to it against damage due to over-current. The NCP1377P also has an in-built temperature control, which will reduce or increase the power output depending on the assigned maximum temperature.

In conclusion, the NCP1377P is a versatile and efficient power IC which is suitable for various application field ranging from low to high power applications. Its various built-in safety features and automatic switching between buck and boost mode allow it to be an ideal solution for many applications.

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