JAJSMY4 September 2021 UCC14240-Q1
The recommended input supply voltage (VIN) for UCC14240-Q1 is between 21 V and 27 V. To help ensure reliable operation, adequate decoupling capacitors must be located as close to supply pins as possible. Local bypass capacitors must be placed between the VIN and GNDP pins at the input; between VDD and VEE at the isolated output supply; and COM and VEE at the lower voltage output supply. Low ESR, ceramic surface mount capacitors are recommended. TI further suggests placing two such capacitors: one with a value of 2.2 μF for supply bypassing and an additional 0.1-μF capacitor in parallel for high frequency filtering. The input supply must have an appropriate current rating to support output load required by the end application.