MP3398AGF

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MP3398AGF is a PMIC - LED Drivers that provides a current-mode driven source solution to boost the VLED of the LED and enhance its luminous efficiency. It is designed to be used in a variety of system architectures, including constant-voltage switching mode, constant-current switching mode, or hybrid-mode. This article will discuss the application fields and working principle of MP3398AGF.

Application Fields

MP3398AGF is mainly used in LED backlight driving and LED lighting application. It has excellent performance in terms of accuracy of luminance, ripple current, and constant current drive. The MP3398AGF chip is suitable for LED backlighting drive of LCD panels, LED lighting applications such as LED luminaire, LED street lamps, LED monitoring lamps, LED car lights, LED Displays, etc.

Working Principle

MP3398AGF adopts the constant-current output mode and is equipped with a Fuzzy PFM control function. When the output current reaches a certain critical current, it will automatically reduce the MOS tube operating frequency and enter the Fuzzy PFM state. The PWM (Pulse Width Modulation) input signal changes the MOS tube operating frequency, and the monitored output current of the output circuit is compared with the internal reference current to generate the precise inductance current. Aiming to accurate control, the maximum inductance current is slightly higher than the standard peak current value, and the minimum inductance current is slightly lower than the standard peak current value. The actual current will be adjusted automatically to make it almost equal to the peak current value.

The MP3398AGF chip has a light control function and a temperature control function, which can automatically adjust the brightness of the LED(s) when the ambient light level or temperature changes, even in environments with large temperature variations and light changes. This can help to improve the performance of the system and meet customer needs.

MP3398AGF uses a special high-linearity current sensing technique which can improve the ripple current and reduce the dead time effectively. In addition, it is designed with many safeguards which can protect the device from abnormal operation, such as over-temperature protection, short-circuit protection, and over-voltage protection.

Conclusion

MP3398AGF is a PMIC - LED Drivers that provides a current-mode driven source solution. It is mainly used in LED backlight driving and LED lighting application and has excellent performance in terms of accuracy of luminance, ripple current, and constant current drive. It adopts the constant-current output mode and is equipped with a Fuzzy PFM control function, light-controlled and temperature-controlled functions, and many safeguards. Ultimately, the MP3398AGF chip can help to improve system performance, meet customer needs, and ensure device safety.

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