SLUUCU2A March 2023 – September 2023 UCC14130-Q1 , UCC14131-Q1
PIN | TYPE1 | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
GNDP | 1, 2, 5, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18 | G | Primary-side ground connection for VIN. PIN 1,2, and 5 are analog ground. PIN 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, and 18 are power ground. Place several vias to copper pours for thermal relief. |
PG | 3 | O | Active low power-good open-drain output pin. PG remains low when (UVLO ≤ VVIN ≤ OVLO); (UVP1 ≤ (VDD – VEE) ≤ OVP1); TJ_Primary ≤ TSHUTPPRIMARY_RISE; and TJ_secondary ≤ TSHUTSECONDARY_RISE |
ENA | 4 | I | Enable pin. Forcing ENA LOW disables the device. Pull HIGH to enable normal device functionality. 5.5-V recommended maximum. |
VIN | 6, 7 | P | Primary input voltage. PIN 6 is for analog input, and PIN 7 is for power input. For PIN 7, connect two, parallel, 10-µF ceramic capacitors from power VIN PIN 7 to power GNDP PIN 8. Connect a 0.1-µF high-frequency bypass ceramic capacitor close to PIN 7 and PIN 8. |
VEE | 19, 20, 21, 22, 23, 24, 25,26, 27, 30,31, 36 | G | Secondary-side reference connection for VDD. The VEE pins are used for the high current return paths. |
VDD | 28, 29 | P | Secondary-side isolated output voltage from transformer. Connect a 10-μF and a parallel 0.1-μF ceramic capacitor from VDD to VEE. The 0.1-μF ceramic capacitor is the high frequency bypass and must be next to the IC pins. |
RLIM | 32 | P | Secondary-side second isolated output voltage resistor to limit the source current from VDD. |
FBVEE | 33 | I | Feedback output voltage sense pin used to adjust the output voltage. |
FBVDD | 34 | I | Feedback (VDD – VEE) output voltage sense pin and to adjust the output (VDD – VEE) voltage. Connect a resistor divider from VDD to VEE so that the midpoint is connected to FBVDD, and the equivalent FBVDD voltage when regulating is 2.5 V. Add a 330-pF ceramic capacitor for high frequency decoupling in parallel with the low-side feedback resistor. The 330-pF ceramic capacitor for high frequency bypass must be next to the FBVDD and VEEA IC pins on top layer or back layer connected with vias. |
VEEA | 35 | G | Secondary-side analog sense reference connection for the noise sensitive analog feedback inputs, FBVDD and FBVEE. Connect the low-side feedback resistors and high frequency decoupling filter capacitor close to the VEEA pin and respective feedback pin FBVDD or FBVEE. Connect to secondary-side gate drive lowest voltage reference, VEE. Use a single point connection and place the high frequency decoupling ceramic capacitor close to the VEEA pin. |