TECHNICAL KNOWLEDGE

TECHNICAL KNOWLEDGE


08

2024

-

04

Guide for commissioning and calculation of micro high frequency QR-LP8842-LP88Gxx

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As a relatively mature third-generation semiconductor material, gallium nitride (GaN) power devices can increase the working frequency of Flyback topology to above 200kHz based on its extremely fast switching speed, excellent on-resistance and extremely low switching loss, and can improve the conversion efficiency of power supply while reducing the volume of power supply. Therefore, GaN has been widely used in fast-charging products of Flyback topology.

As a relatively mature third-generation semiconductor material, gallium nitride (GaN) power devices can increase the working frequency of Flyback topology to above 200kHz based on its extremely fast switching speed, excellent on-resistance and extremely low switching loss, and can improve the conversion efficiency of power supply while reducing the volume of power supply. Therefore, GaN has been widely used in fast-charging products of Flyback topology.
To fully utilize the excellent characteristics of GaN, excellent power management chip (PMIC) is the key. The power management chip should meet the requirements of high frequency and high efficiency at the same time, and make the power supply work stably and noisellib under full load conditions.
The second generation of high-frequency gallium nitride control core LP8842DC series products are designed to optimize the characteristics of gallium nitride. This model works in QR mode, works in a frequency range of 25kHz ~ 390kHz, and has a bottom lock-on mode. Built-in HV startup and X capacitor discharge function, low power consumption and noise in "soft frequency hopping" mode under extremely light load. In addition, the chip has built-in output current sensing and calculation unit, which can accurately control the output overcurrent point of the power supply with complicated compensation calculation.
In addition, the chip also has a wealth of protection functions, according to the different actions after protection, divided:


 

Core Mao micro high frequency QR-LP8842-LP88Gxx debugging and calculation guide. pdf