A good PCB layout for optimal thermal performance involves placing thermal vias under the IC, using a solid ground plane, and keeping the thermal path as short as possible. A 4-layer PCB with a dedicated thermal layer is recommended.
To ensure stable operation with a high-ESR output capacitor, add a small ceramic capacitor (e.g., 10nF) in parallel with the output capacitor to improve the overall capacitor's ESR. This helps to reduce the risk of oscillation.
The maximum allowed voltage on the EN pin is 6V. Exceeding this voltage may damage the device. It's recommended to use a voltage divider or a clamp circuit to ensure the EN pin voltage remains within the specified range.
The ZXTC6718MCTA is rated for operation up to 125°C. However, the device's performance and reliability may degrade at high temperatures. It's essential to consider the thermal design and ensure the device operates within its specified temperature range.
The output voltage ripple can be calculated using the formula: ΔVout = (Iout * ESR) / (fsw * Cout), where Iout is the output current, ESR is the output capacitor's equivalent series resistance, fsw is the switching frequency, and Cout is the output capacitance.
ZXTC6718MCTA datasheet
by Diodes Incorporated
