A good PCB layout is crucial for the RT8123AGQW. Richtek recommends a 4-layer PCB with a solid ground plane, and the IC should be placed near the power input. Decoupling capacitors should be placed close to the IC, and the output capacitors should be placed near the output pins. A detailed layout guide can be found in the Richtek application note AN-103.
To ensure stability, follow the recommended component values and PCB layout. Additionally, make sure the output capacitors are of high quality and have low ESR. A minimum of 10uF output capacitance is recommended. If oscillations occur, try adding a small resistor (1-10 ohms) in series with the output capacitor to dampen the oscillation.
Although the datasheet specifies a maximum input voltage of 18V, it's recommended to limit the input voltage to 15V to ensure reliable operation and prevent damage to the IC.
The RT8123AGQW is rated for operation up to 85°C. However, for reliable operation, it's recommended to derate the output current and input voltage as the temperature increases. Consult the datasheet and application notes for more information on thermal considerations.
Start by checking the input voltage, output voltage, and output current. Verify that the component values and PCB layout match the recommended design. Check for signs of overheating, such as excessive temperature or burning smells. Consult the datasheet, application notes, and Richtek's technical support resources for further guidance.
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