The UC2843AD8G4 is a high-frequency switching regulator, and as such, it requires careful PCB design and layout to minimize noise, EMI, and parasitic inductance. TI recommends using a 4-layer PCB with a solid ground plane, separating the high-current paths from the low-current paths, and using short, wide traces for the power lines. Additionally, it's essential to follow the recommended component placement and orientation to minimize noise coupling.
Choosing the right inductor for the UC2843AD8G4 involves considering factors such as inductance value, saturation current, and core material. TI recommends using an inductor with an inductance value between 1.5 μH and 3.3 μH, and a saturation current rating that exceeds the peak current of the converter. Additionally, the inductor should have a low DC resistance and be designed for high-frequency operation.
The UC2843AD8G4 has an absolute maximum input voltage rating of 18 V, but the recommended maximum operating input voltage is 15 V. Exceeding this voltage can cause damage to the device or affect its performance.
The UC2843AD8G4 requires compensation to ensure stability and prevent oscillations. TI recommends using a Type II compensation network, which consists of a resistor, capacitor, and zero-pin. The values of these components depend on the specific application and can be calculated using TI's compensation calculator or by following the guidelines in the datasheet.
The UC2843AD8G4 requires an output capacitor with a low ESR (Equivalent Series Resistance) to minimize voltage ripple and ensure stability. TI recommends using an output capacitor with an ESR of less than 0.1 Ω, and a capacitance value that meets the required output voltage ripple specification.
UC2843AD8G4 datasheet
by Texas Instruments
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