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
A good PCB layout for optimal thermal performance involves placing the device near a thermal pad or a heat sink, using a 2-layer or 4-layer board, and minimizing the distance between the device and the thermal pad or heat sink. Additionally, using thermal vias and a solid ground plane can help to dissipate heat more efficiently.
To ensure proper power-up and configuration, follow the recommended power-up sequence, which involves applying VCC before EN, and then configuring the device using the I2C interface. Make sure to follow the recommended voltage and current ratings, and use a suitable capacitor for decoupling.
To ensure EMI and EMC compliance, use a shielded cable for the I2C interface, keep the device away from high-frequency sources, and use a common-mode choke or ferrite bead to filter out high-frequency noise. Additionally, follow good PCB design practices, such as using a solid ground plane and minimizing loop areas.
To troubleshoot issues, start by checking the power supply voltage and current, and verifying that the device is properly configured. Use a logic analyzer or oscilloscope to monitor the I2C interface and verify that the device is receiving the correct commands. Check for any signs of overheating, and verify that the device is properly soldered and mounted.
Using a different capacitor value for the output filter can affect the stability and transient response of the device. A larger capacitor value can improve filtering but may increase the startup time, while a smaller capacitor value can improve transient response but may reduce filtering. Consult the datasheet and application notes for recommended capacitor values and design guidelines.
Trust Checks
This model has been built in collaboration with the manufacturer.
Manufacturer Collaborated
This model has been verified by system checks.
System Verified
This model has been reviewed by community users.
Community Approved
Sponsored
ISL97687IRTZ-T Overview
Use the download button to access the ISL97687IRTZ-T schematic symbol, PCB footprint, and 3D model.
To find more CAD model downloads similar to this part, try a partial part number search, like ISL97,
or try a keyword search, such as Display Drivers
