AD8240YRMZ-RL

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The AD8240YRMZ-RL belongs to the PMIC – LED Drivers category. It is a regulated constant current output, full-bridge buck controller. It is suitable for high power applications such as automotive and high–power general lighting. It can be used to buck inductive loads such as those from a transformer or a relay. With its wide input range, it can be used to boost higher voltage, two-level input power supplies.

The AD8240YRMZ-RL application field includes automotive lighting, general lighting, solid-state relays, and HVAC applications. It is designed for low-power, high-efficiency buck conversion without a heatsink. It features a 0.1mΩ current sensing resistor, high efficiency, and Tj max of 150°C allowing for fast switching and hot swapping. The ICs are also designed to provide 35W continuous power and have a low ground current of just 30µA.

The AD8240YRMZ-RL working principle is based on a Pulse Width Modulation (PWM) converter with a single-ended control loop topology. The IC operates in a Discontinuous Conduction Mode (DCM). The controller provides a regulated output current which is sensed by the 0.1mΩ sense resistor connected to the output and also monitors the inductor current. This ensures a low voltage drop reducing power dissipation in the device as well as improving efficiency.

The AD8240YRMZ-RL is equipped with integrated slew-rate-reduction circuitry and an open-loop 100kHz oscillator. This allows for a wide range of applications with reduced EMI noise. The controller protects against output overvoltage, inductor current limit, and output-capacitor overvoltage conditions. In addition, it maintains a stable output voltage even during current changes in the LED chains.

The IC also features an over-temperature protection feature and an adjustable power-good output for monitoring output voltage. The device also provides additional integrated features such as external clock synchronization, stand-by control input, soft-start and adjustable current limit.

In summary, the AD8240YRMZ-RL is an efficient PWM converter with a single-ended control loop topology. It has low power dissipation and is ideal for automotive lighting, general lighting, solid-state relays, and HVAC applications. It is equipped with advanced features such as an adjustable power-good output, external clock synchronization, and over-temperature protection.

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