ISL97635AIRZ

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PMIC, or Power Management Integrated Circuits, are a type of semiconductor circuits used in almost all electronic devices to provide power control and management. LED Drivers are specialized PMICs used to handle current and voltage levels in LED lighting circuits. ISL97635AIRZ is a PMIC-LED driver IC designed by Renesas Electronics Corporation for driving multiple strings of high voltage LEDs. It is a space-saving, low-power solution for applications such as automotive headlights, sidelights, and high-bay lighting.

The ISL97635AIRZ is a single-chip high side switch-mode current driver IC. It utilizes constant-current control to ensure the desired light output from multiple LEDs (LED strings) controlled by a few cold cathode fluorescent lamps (CCFL). As such, it acts as an efficient, adaptable, and stable current source for driving multi-string LED lighting. It features high behind-the-channel response time and a built-in soft-start function.

The ISL97635AIRZ has several features that make it suitable for various high voltage LED lighting applications. It has a boost converter with dedicated high-side switches that are capable of driving multiple LED strings independent of each other with controlled off-time. It also has low LED ripple current, which minimizes LED drive noise and eliminates the need for EMI filtering. Additionally, resonant Switching topology allows the device to operate in the discontinuous conduction mode for improved efficiency.

ISL97635AIRZ provides a high level of control in LED lighting design. It includes advanced control parameters such as current sensing voltage (VCS) and switching frequency (Fs). It also has a programmable ramp-rate for fast dimming and flicker-free operation. A switching frequency synchronization function enables multiple LED strings to be synchronized to reduce LED flicker. Furthermore, VCC under-voltage lockout (UVLO) protection ensures that the LED supply voltage is kept within a safe range, while a thermal protection circuit (TPC) ensures the LED current is kept within a predefined range.

Efficiency is one of the key improvements provided by the ISL97635AIRZ. It has a driver efficiency of up to 97 percent, providing improved energy savings and reduced system thermal budgeting. It offers fast PWM dimming, low power standby mode, programmable turn-off and turn-on technologies, and a supply voltage range of 12V to 40V. Its built-in over-current protection, output short-circuit protection and UVLO protection safeguard against abnormal operation and ensure the system is always running properly.

The ISL97635AIRZ is an ideal solution for high-bay lighting applications. Its multiple string support, high efficiency, flicker-less operation and fast PWM dimming make it suitable for indoor and outdoor LED lighting. It is also suitable for automotive headlights, tail lights, and side lighting applications where faster switching to achieve instantaneous illumination and a more natural dimming effect are desired.

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