RT8497CGS Integrated Circuits (ICs)

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RT8497CGS is a kind of PMIC (Power Management IC) - LED Driver intended to provide sufficient electric power for LED lights. It has many advantages like high boosting efficiency, low power consumption and low Standby-Current. This article will discuss the application field and working principle of RT8497CGS.

Application Field

RT8497CGS is primarily applied in high efficient light applications like area lighting, street lights, courtyard lights, etc. Generally speaking, this IC is suitable to drive a variety of LEDs, like high power LEDs, mid power LEDs and low power LEDs, making it an ideal choice for lighting systems. It is also used to drive a variety of LEDs with configurations suitable for automotive and aviation industries. This IC is suppied with the die package which could provide maximum user flexibility and light performance.

Working Principle

RT8497CGS is a current mode Boost Converter, which is designed to drive a wide range of lighting applications. It is composed of two power stages: a high-side control power stage and a low-side current flow control power stage. In the high-side control stage, a charging capacitor boosts the input voltage and provides an efficient starting voltage in the low-side current flow control stage. The low-side current flow control stage includes a power MOSFET and a current sense resistor. The power MOSFET provides a very low resistance for the current flow, which could reduce the power dissipation. The current sense resistor could provide a reference voltage, which could be utilized for the current feedback loop.

In RT8497CGS, the control loop of boost converter is based on current control. The primary current control loop is to regulate the voltage and current of the power LEDs. It uses 1:1 current mode control, with a 0-2V reference voltage, which allows it to have a fast transient response. This loop also includes over-current protection and isolated feedback, which ensures the reliability and performance of the system.

The secondary control loop is for voltage adjustment. When the external components, such as the capacitors of different parameters, change, the system may need to adjust the output voltage to ensure that the voltage still meets the requirements. The potential divider circuit of the secondary control loop is used to detect the output voltage, compare it to the target voltage and then provide feedback to the system. In this way, the output voltage can be adjusted automatically.

In summary, RT8497CGS is a power management IC - LED Driver and its application places in lights including area lighting, street lights, and courtyard lights. This IC has a high boosting efficiency, low power consumption, and low Standby-Current. Its working principle mainly based on the current control loop and voltage adjustment loop. The current control loop is for current regulation and the voltage adjustment loop is for voltage adjustment and feedback. Both of the loops help to provide reliable and efficient power for LED lighting.

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