Description:The ISL97687 is a PWM controlled LED driver that supports four channels of LED current, for Monitor and TV LCD backlight applications. It is capable of driving 160mA per channel from a 9V to 32V input supply, with current sources rated up to 75V absolute maximum. The ISL97687's current sources achieve typical current matching to ±1%, while dynamically maintaining the minimum required VOUT necessary for regulation. This adaptive scheme compensates for the non-uniformity of forward voltage variance in the LED
The recommended PCB layout for the ISL97687IBZ involves keeping the input and output capacitors close to the device, using a solid ground plane, and minimizing the length of the traces between the device and the capacitors. Additionally, it's recommended to use a 4-layer PCB with a dedicated power plane and a dedicated ground plane to reduce noise and EMI.
The selection of input and output capacitors for the ISL97687IBZ depends on the specific application requirements. In general, it's recommended to use low-ESR capacitors with a capacitance value of 10uF to 22uF for the input and output. The capacitor's voltage rating should be at least 1.5 times the maximum input voltage. Additionally, the capacitor's temperature rating should be considered, especially in high-temperature applications.
The ISL97687IBZ can operate in an ambient temperature range of -40°C to +85°C. However, the device's performance and reliability may be affected at high temperatures, and it's recommended to derate the device's output current and voltage accordingly.
To ensure the ISL97687IBZ is stable and doesn't oscillate, it's recommended to follow the datasheet's guidelines for component selection and PCB layout. Additionally, it's recommended to add a small ceramic capacitor (e.g., 10nF) between the VIN pin and the GND pin to filter out high-frequency noise. It's also important to ensure that the input and output capacitors are properly decoupled and that the device is not subjected to excessive noise or EMI.
The ISL97687IBZ is designed for low-to-moderate current applications up to 3A. While it's possible to use the device in high-current applications, it's not recommended as it may exceed the device's thermal and electrical ratings. In high-current applications, it's recommended to use a more suitable device or to consider using multiple ISL97687IBZ devices in parallel.
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ISL97687IBZ Overview
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