Texas Instruments recommends a 4-layer PCB with a solid ground plane, and to keep the analog and digital signals separate. The datasheet provides a recommended layout and routing guide.
To optimize LED current accuracy and stability, ensure that the input voltage is within the recommended range, use a low-ESR capacitor for the output filter, and minimize the PCB trace resistance. Additionally, use a high-precision resistor for the current sense resistor.
The maximum ambient temperature for the LP5521YQ/NOPB is 85°C. However, the device can operate up to 105°C with derating.
The LP5521YQ/NOPB has built-in fault detection and protection features, including over-temperature protection, over-current protection, and under-voltage lockout. Additionally, you can implement external fault detection and protection circuits using the device's fault detection pins.
The recommended input capacitor value is 10uF to 22uF, and the recommended type is a low-ESR ceramic capacitor, such as an X5R or X7R dielectric capacitor.
LP5521YQ/NOPB datasheet
by Texas Instruments
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