Toshiba recommends a 4-layer PCB with a solid ground plane, and a separate power plane for the input and output. The input and output capacitors should be placed as close as possible to the IC, and the feedback resistors should be placed close to the output pin.
To ensure stability, ensure that the output capacitor is properly sized and placed, and that the feedback resistors are correctly selected. Additionally, a small capacitor (e.g., 10nF) can be added between the output pin and the feedback pin to improve stability.
The maximum allowed input voltage ripple is not explicitly stated in the datasheet, but as a general rule, it's recommended to keep the input voltage ripple below 1% of the nominal input voltage to ensure stable operation.
The RN1407,LF is rated for operation up to 125°C, but the maximum junction temperature (Tj) should not exceed 150°C. Ensure that the device is properly heat-sinked and that the operating temperature is within the specified range.
The output voltage tolerance can be calculated by considering the internal voltage reference tolerance, the resistor tolerance, and the output voltage adjustment range. A typical output voltage tolerance is ±2%.
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