The UC3611DW requires a careful PCB design to ensure proper operation. TI recommends a 4-layer PCB with a solid ground plane, and the use of vias to connect the input and output capacitors to the ground plane. Additionally, the layout should minimize the loop area of the high-frequency currents and keep the sensitive analog nodes away from the switching nodes.
The input capacitor should have a low ESR and be rated for the maximum input voltage. A ceramic capacitor with an X7R or X5R dielectric is recommended. The output capacitor should have a low ESR and be rated for the maximum output voltage. A ceramic or electrolytic capacitor can be used, but the electrolytic capacitor should have a low ESR and be rated for the maximum output voltage.
The UC3611DW has an operating temperature range of -40°C to 125°C. However, the device's performance and reliability may degrade at extreme temperatures. It's recommended to operate the device within the recommended temperature range for optimal performance.
The UC3611DW has a built-in OVP and UVP feature. The OVP threshold is set to 18V, and the UVP threshold is set to 8V. However, external resistors can be used to adjust the OVP and UVP thresholds. Additionally, external circuitry can be added to provide additional protection features, such as overcurrent protection and short-circuit protection.
The recommended startup sequence for the UC3611DW is to first apply the input voltage, then the enable signal (EN), and finally the clock signal (CLK). This sequence ensures that the device starts up correctly and avoids any potential latch-up or damage.
UC3611DW datasheet
by Texas Instruments
