NCP1377BP

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The NCP1377BP, a member of the NCP13xx series of power supply controllers, is a versatile device used in AC-DC converters and offline switchers. Designed to meet the requirements of the demanding industrial, telecom and enterprise markets, the NCP1377BP includes many features and integrated blocks aimed at providing a cost-effective solution for low power applications.

The NCP1377BP is an integrated power switching component that can drive an external MOSFET switch. It offers a peak current-mode control architecture with a wide range of programmable features. It is designed to deliver up to 5A of continuous current into a wide range of load types.

The AC/DC converter part of the NCP1377BP is composed of a line off comparator, a MOSFET gate driver, a current-sense resistor, and a power MOSFET. The main features of this section are the output voltage regulation, overload protection, and operating temperature from -40°C to 130°C. It also includes a current-mode control loop, an internal oscillator and a frequency peak current limit.

for the offline switcher part, the NCP1377BP includes a start-up current source, internal frequency compensation, an under-voltage lockout (UVLO) circuit, and an over-voltage sense (OVS) circuit. The start-up current source, with hysteresis regulation, provides an output voltage to the power MOSFET path, initiating turn-off when the supply voltage reaches a preset level. This prevents the power MOSFET from drawing excessive power.

The OVS circuit monitors the output voltage, comparing it to a preset value, and when it exceeds this value, the UVLO output is set to stop further operation. The NCP1377BP also has a high- and low-side current sense circuit. The high-side current sense circuit (HSC) circuit monitors the output current, providing an indication of the events that occur when current is being overloaded or shorted.

The NCP1377BP operates in current-mode control, where both the high and low sides are driven by a single current source. The current source regulates the ON-time and the OFF-time of the external MOSFET switch. This eliminates the need for large gate drives, as well as large external gate-drive components. Furthermore, current-mode control offers improved control for both synchronous and asynchronous rectifiers, allowing for higher drive performance.

The NCP1377BP is also equipped with an internal 8-bit microcontroller, providing a comprehensive set of features including frequency synchronization, cycle-by-cycle current limit, over-voltage and under-voltage protection, programmable soft-start, and peak current limit. The microcontroller also features a programmable operating mode, allowing the user to select different operating modes to improve efficiency or increase output power.

The NCP1377BP also includes an integrated Feedback Error Amplifier, Error Amplifier output filter, Internal Flip-Flop comparator, and a MOSFET DRIVER. The Feedback Error Amplifier is used to shape the error signal created by the input voltage, providing a feedback signal to the microcontroller. The Filter reduces noise and ripple on the error signal, improving output stability. The Flip-Flop comparator is used for limiting the start-up current and prevent over-current occurrences, while the MOSFET DRIVER provides power to the external MOSFET switch.

In conclusion, the NCP1377BP is a cost-effective power supply controller offering a wide range of features for applications in AC-DC converters and offline switchers. Thanks to its current-mode control and integrated microcontroller, it provides high efficiency and low THD with low cost and easy-to-use components.

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