The UCC3800DTR is a high-frequency device, and proper layout and placement are crucial for its operation. TI recommends a 4-layer PCB with a solid ground plane, and the device should be placed close to the input capacitors. The output inductor and diode should be placed close to the device as well. A good layout will help reduce EMI and improve efficiency.
The input capacitor should have a low ESR and be rated for the input voltage. A ceramic capacitor with an X7R or X5R dielectric is recommended. The output capacitor should also have a low ESR and be rated for the output voltage. A ceramic or electrolytic capacitor can be used, depending on the specific application requirements.
The maximum ambient temperature for the UCC3800DTR is 85°C. However, the device can operate up to 125°C junction temperature. It's essential to ensure proper thermal design and heat sinking to keep the device within its operating temperature range.
The output voltage of the UCC3800DTR can be adjusted by changing the feedback resistors (R1 and R2) or the voltage reference (VREF) pin. The output voltage can be calculated using the formula: VOUT = VREF x (1 + R2/R1).
The minimum input voltage for the UCC3800DTR is 6.5V. However, the device can operate down to 5.5V with reduced performance. It's essential to ensure the input voltage is within the recommended range for optimal performance and efficiency.
UCC3800DTR datasheet
by Texas Instruments
