ROHM recommends a compact PCB layout with short traces and minimal inductance to ensure high-frequency performance. A 4-layer PCB with a solid ground plane is recommended. Additionally, place the input and output capacitors close to the device to minimize parasitic inductance.
To ensure the PDZVTR22B operates within its SOA, monitor the device's junction temperature (Tj) and keep it below the maximum rating of 150°C. Also, ensure the input voltage and current are within the recommended specifications, and provide adequate heat sinking to prevent thermal runaway.
ROHM recommends using a low-ESR ceramic capacitor with a value between 1uF to 10uF, depending on the input voltage and frequency. A 4.7uF or 10uF X7R or X5R ceramic capacitor is a good starting point. The capacitor should be placed close to the device's input pins to minimize parasitic inductance.
To troubleshoot oscillations or instability issues, check the PCB layout for any signs of parasitic inductance or capacitance. Ensure the input and output capacitors are properly placed and sized. Also, verify that the device is operated within its recommended specifications, and the input voltage is stable and free from noise. If issues persist, consider adding a small series resistor (e.g., 1-10 ohms) to the output to improve stability.
During startup, the PDZVTR22B has a soft-start feature that gradually ramps up the output voltage to prevent inrush currents. The startup time is typically around 1-2 ms, depending on the input voltage and output capacitance. Ensure the input voltage is stable and within the recommended range during startup to prevent any issues.
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PDZVTR22B Overview
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