Description:The ISL97672B is an integrated 6-channel power LED driver for LCD backlight applications. The ISL97672B is capable of driving LEDs with an input from 4. 5V to 26. 5V and a maximum output up to 45V. The ISL97672B employs an adaptive boost switching architecture that allows direct PWM dimming with dimming duty cycle as low as 0. 007% at 200Hz or 0. 8% at 20kHz. PWM Dimming frequency can be as high as 30kHz. The ISL97672B employs dynamic headroom control that monitors the highest LED forward voltage string for
Renesas provides a recommended PCB layout in the application note AN1995, which includes guidelines for thermal vias, copper pours, and component placement to minimize thermal resistance and ensure reliable operation.
The input capacitor selection depends on the input voltage, output voltage, and output current. Renesas recommends using a low-ESR ceramic capacitor with a value between 4.7uF to 10uF, and a voltage rating of at least 2x the input voltage. The application note AN1995 provides more detailed guidelines.
The ISL97672BIRZ-T is rated for operation up to 85°C ambient temperature, but the maximum junction temperature (TJ) should not exceed 125°C. The application note AN1995 provides thermal derating guidelines to ensure reliable operation.
Renesas recommends checking the input voltage, output voltage, and output current to ensure they are within the specified ranges. Also, verify that the feedback resistors are correctly connected and that the output capacitor is properly selected. The application note AN1995 provides a troubleshooting guide for common issues.
Yes, the ISL97672BIRZ-T is compatible with lead-free soldering processes, and Renesas recommends following the JEDEC J-STD-020C standard for lead-free soldering.
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ISL97672BIRZ-T Overview
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