The UC2833DW requires careful layout and placement to ensure proper operation. TI recommends placing the IC close to the input capacitors, using short and wide traces for the power lines, and separating the analog and digital grounds. A 4-layer PCB with a solid ground plane is also recommended.
The input capacitor should be a low-ESR ceramic capacitor with a value between 10uF to 22uF, and the output capacitor should be a low-ESR ceramic or tantalum capacitor with a value between 10uF to 47uF. The capacitor selection also depends on the output voltage and current requirements.
The UC2833DW can operate in an ambient temperature range of -40°C to 85°C, but the junction temperature should not exceed 125°C. Proper thermal design and heat sinking are necessary to ensure reliable operation.
The output voltage of the UC2833DW can be adjusted by changing the resistive divider ratio of the feedback resistors (R1 and R2). The output voltage can be calculated using the formula: Vout = 1.25V x (1 + R2/R1).
The EN (enable) pin is used to turn the regulator on or off. When the EN pin is pulled high, the regulator is enabled, and when it is pulled low, the regulator is disabled. This pin can be used to implement power sequencing or to reduce power consumption in standby mode.
UC2833DW datasheet
by Texas Instruments
