Texas Instruments provides a recommended PCB layout in the datasheet, but it's essential to follow good PCB design practices, such as keeping the input and output traces separate, using a solid ground plane, and minimizing noise coupling. Additionally, ensure the device is placed near the power supply and decoupling capacitors.
The output capacitor value depends on the desired output voltage ripple, output current, and stability. A general rule of thumb is to use a capacitor with a value between 10uF to 47uF, with a voltage rating of at least 2x the output voltage. However, it's recommended to consult the datasheet and perform simulations to determine the optimal value for your specific application.
Although the datasheet specifies a maximum input voltage of 6V, it's recommended to limit the input voltage to 5.5V to ensure reliable operation and prevent damage to the device. Exceeding the maximum input voltage can lead to reduced performance, increased power consumption, or even device failure.
To ensure stability, follow the recommended PCB layout, use a suitable output capacitor, and ensure the input voltage is within the specified range. Additionally, add a small ceramic capacitor (e.g., 10nF) between the VOUT and GND pins to improve stability. If oscillations occur, check the PCB layout, decoupling, and output capacitor value.
The typical startup time for the CDCEL937PW is around 1ms to 2ms, depending on the input voltage, output capacitor value, and load conditions. However, this time can vary depending on the specific application and design. It's recommended to consult the datasheet and perform simulations to determine the startup time for your specific use case.
CDCEL937PW datasheet
by Texas Instruments
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