ROHM 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, make sure to follow the recommended component values and PCB layout. Additionally, ensure that the output capacitor is properly sized and placed, and that the feedback resistors are correctly selected. If oscillation occurs, try adding a small capacitor (e.g., 10nF) between the output pin and ground.
Although the datasheet specifies a maximum input voltage of 25V, it's recommended to limit the input voltage to 20V to ensure reliable operation and prevent damage to the IC.
The BP5275-25 is rated for operation up to 85°C, but it's recommended to derate the output current and voltage at higher temperatures to ensure reliable operation. Consult the datasheet and ROHM's application notes for more information.
The output voltage ripple can be calculated using the formula: ΔVout = (Iout * ESL) / (Cout * fsw), where ESL is the equivalent series inductance of the output capacitor, Cout is the output capacitance, and fsw is the switching frequency. Consult the datasheet and ROHM's application notes for more information.
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BP5275-25 Overview
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