The UC3526ADWTR is a high-frequency switching regulator, and as such, proper PCB layout and design are crucial for optimal performance. TI recommends a multi-layer PCB with a solid ground plane, and careful placement of components to minimize noise and EMI. A good rule of thumb is to keep the switching node (pins 1-3) away from sensitive analog circuits, and to use a shielded inductor to reduce EMI.
Choosing the right inductor for the UC3526ADWTR involves considering factors such as inductance value, current rating, and core material. TI recommends using a shielded inductor with a high saturation current rating, and a low equivalent series resistance (ESR). A good starting point is to use an inductor with an inductance value between 10-22uH, and a current rating of at least 1.5 times the maximum output current.
The UC3526ADWTR has an absolute maximum input voltage rating of 18V, but TI recommends operating the device within a maximum input voltage of 15V to ensure reliable operation and to prevent damage to the internal voltage regulator.
The UC3526ADWTR requires compensation to ensure stability and prevent oscillations. TI recommends using a Type II compensation network, which consists of a series resistor and capacitor connected between the COMP pin and GND. The values of the resistor and capacitor can be calculated using TI's compensation calculator or by following the guidelines in the datasheet.
The EN/DIS pin on the UC3526ADWTR is an active-low enable input that allows the user to turn the device on or off. When the EN/DIS pin is pulled low, the device is enabled and begins switching. When the EN/DIS pin is pulled high, the device is disabled and enters a low-power standby mode.
UC3526ADWTR datasheet
by Texas Instruments
