IS31BL3506B-STLS2-TR

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The IS31BL3506B-STLS2-TR belongs to the category of PMIC (Power Management IC) - LED Drivers. It is a highly integrated, constant-current LED driver with 9 independent load channels and an adjustable maximum current from 50mA to 500mA per load. The chip also features an embedded buck regulator, which allows high-efficiency LED current driving with minimal external components, a configurable output slew rate for LED current ripple control and a low-power shutdown mode for enhanced system performance. Below we will discuss the application fields and the working principle of the IS31BL3506B-STLS2-TR.

Application fields

The IS31BL3506B-STLS2-TR has been designed to meet the requirements of low-power applications, and hence it is widely used in a variety of applications, some of them being:

• Keyboard backlighting.
• VR/AR headsets and goggles.
• Robots, drones and special-purpose vehicle lighting.
• Interior and exterior car lighting.
• Remote-controllable systems.
• High-efficiency LED current driving.
• LED dimming control.
• Mobile and handheld electronics.
• Scalable lighting systems.

Working Principle

The IS31BL3506B-STLS2-TR chip is essentially composed of two main components: the buck converter, which is responsible for voltage regulation, and the 9 independent load drivers, each responsible for driving an LED. The chip works in three main stages:

1. The first stage is the voltage regulation, governed by the buck converter. In this stage, the buck converter steps down the input voltage to a voltage level suitable for the LEDs. This voltage level is regulated by an internal Analog-to-Digital Converter (ADC) which compares the analog input voltage to a reference current.
2. The second stage is the LED current regulation. Here, each LED is driven using such characteristics like brightness and flicker control, and the reference input voltage is compared and filtered to control the LED current. The reference input voltage can also be adjusted to tailor the LED current output.
3. The last stage is the LED flicker suppression. This stage is responsible for reducing the LED flicker by using a PLL (Phase Lock Loop) to reduce the LED ripple frequency. All of these processes are done in an effort to minimize system power consumption while maximizing LED performance.

In conclusion, the IS31BL3506B-STLS2-TR is a highly integrated LED driver suitable for a wide range of applications. It is equipped with a buck converter that can step down the input voltage to a level suitable for the LEDs and 9 independent load drivers to regulate the LED current. It also features a PLL for LED flicker suppression, and it has very low power consumption.

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