AAT2870IUW-T1 Integrated Circuits (ICs)

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PMIC - LED Drivers are becoming more and more popular nowadays due to their ability to provide constant current to LEDs and to achieve efficient power optimisation. AAT2870IUW-T1 is an example of such a device, an integrated boost-mode converter which can provide up to 25V of output voltage and 700mA peak current. It supports both step up and step down modes, allowing it to be used in a variety of applications. Furthermore, it has an integrated output current sensing scheme, an adjustable soft-start function and can be enabled/disabled using an external TTL logic signal.

The AAT2870IUW-T1 is mainly used in LED backlighting applications, where its output voltage can be adjusted to fit the LED requirements. The device also features an internal and external PWM dimming control, as well as an internal compensation circuit, allowing for fast and stable operation. Furthermore, the low shutdown current (less than 3uA) and the thermal shutdown feature, make the device suitable for use in portable and battery-powered devices.

The working principle of AAT2870IUW-T1 is based on the well-known flyback topology. The basic idea is that a transformer driven by an oscillator is used to step up the voltage from the input source. This voltage is then used to drive an internal switch network which regulates the output current. The output voltage can then be adjusted depending on the output voltage setting.

At the beginning of the cycle, the switch is driven on and a current starts to flow in the primary side of the transformer. This is then used to create a magnetic field which stores energy. When the switch is turned off, this stored energy is released back into the transformer and then rectified, after which it is fed to the output. The output voltage is then regulated by controlling the switching frequency, the duty cycle of the switch and the turns ratio of the transformer.

In addition, the AAT2870IUW-T1 features an internal current sense network which allows for better control of the output current. This is done by monitoring the current flowing through the switch and then actively regulating it, thus avoiding power overloading. Furthermore, the active current-limit protection feature will automatically turn off the switch if the output current limit is exceeded, ensuring the device’s life-time.

The AAT2870IUW-T1 is an integrated boost-mode converter which offers a wide range of features and benefits. It can provide up to 25V of output voltage and 700mA peak current, and features both step up and step down modes. It also has an integrated output current sensing feature, an adjustable soft-start function and can be enabled/disabled through an external TTL logic signal. Furthermore, the device can be used in LED backlighting applications, and features an internal and external PWM dimming control, as well as an internal compensation circuit. All these features make the AAT2870IUW-T1 an ideal choice for many applications.

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