Description:The ISL97682, ISL97683, ISL97684 are Renesas' highly integrated 2-3-4-channel LED drivers that are suitable for medium size TFT-LCD backlights. These parts can drive multiple channels of LEDs from inputs as low as 4V to outputs of up to 45V. They can also operate from inputs as low as 3V to outputs of up to 26. 5V in bootstrap configuration. The ISL97682, ISL97683, ISL97684 feature optional channels phase shift control. This feature is used to minimize the input, output ripple characteristics and load trans
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.
To optimize output voltage accuracy and stability, ensure that the input voltage is within the recommended range, use a high-quality output capacitor with low ESR, and minimize noise and ripple on the input and output lines. Additionally, consider using a voltage reference IC, such as the ISL21090, to provide a stable reference voltage.
The maximum output current capability of the ISL97683IRTZ is 3A, but it can be limited by the thermal performance of the PCB and the ambient temperature. Be sure to check the thermal derating curves in the datasheet to ensure the device can handle the required output current in your specific application.
To protect the ISL97683IRTZ from input voltage transients and surges, consider adding input voltage transient protection devices, such as TVS diodes or surge absorbers, to clamp the input voltage to a safe level. Additionally, ensure that the input capacitor is rated for the maximum expected input voltage and has a low ESR to minimize voltage ringing.
The recommended input capacitor value is 10uF to 22uF, with a low ESR (Equivalent Series Resistance) of less than 100mΩ. A ceramic or film capacitor with an X7R or X5R dielectric is recommended, as they provide a stable capacitance over a wide temperature range.
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ISL97683IRTZ Overview
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