NCP1377BD1R2G

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Power Management Integrated Circuit (PMIC) is a device which integrates several functional blocks for power management including AC/DC converters, offline switchers, linear regulators and so on. This article will mainly focus on the application field and working principle of NCP1377BD1R2G, which belongs to AC/DC converter, offline switcher.

NCP1377BD1R2G is a High Voltage Variable Frequency Offline Switch (VFOS) Controller. The device mainly serves as an energy efficient, low standby power, cost effective, and easy to design alternative to conventional off-line flyback based power supplies. It can be used in low to medium power fixed-hz offline converters with Direct-on-line (DOL), phase-controlled, early burst, semi-conductor starter, leading edge modulator (LEM), and trailing edge modulator (TEM) architectures. In particular, it is suitable for constant voltage/constant current (CV/CC) and constant power (CW) applications with switcher stages.

The device has an integrated high voltage switch for primary control (and optionally for post regulation) and also includes a wide range of protection features. It integrates a high voltage loop error amplifier, an on/off ramp compensation DAC, an oscillator, high voltage MOSFET driver and optoisolation. All of these are mounted in the same package.

As for the working principle, NCP1377BD1R2G is designed to provide highly reliable and efficient offline power conversion with a wide input voltage range and low voltage standby current (<1uA typ.). A high voltage regulator loop is used to accurately set and maintain the secondary side output voltage, while the high voltage switch is used to control the power delivered on the primary side (even with light-load conditions).

The device includes a Feedforward Compensation DAC that, through a single resistor, can be programmed to provide either CV/CC, CW or arbitrary waveforms on the primary side. The compensation DAC provides a high accuracy output, that closely follows the programmed waveform and eliminates the need for an external microcontroller for loop control.

Furthermore, the device also integrates high voltage loop error amplifier and on/off ramp compensation DAC for improved performance and a wide range of circuitry for protection and stability: A high voltage precision voltage reference (1.2V), overvoltage shutter, integrated output capacitor series resistance sense, ramp shaping filter, and optoisolation pins.

In conclusion, NCP1377BD1R2G belongs to the AC/DC converter, offline switcher PMIC family and features high efficiency, low standby power, adjustable input voltage and output voltage, high current monitoring, and a wide range of protection features. The device provides excellent performance, control and reliability.

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