The UC2852D is a high-frequency switching regulator, and proper PCB layout is crucial for its operation. TI recommends a 4-layer PCB with a solid ground plane, and the use of vias to connect the top and bottom layers. The input and output capacitors should be placed close to the IC, and the feedback network should be routed away from the switching node. A detailed layout guide is available in the TI application note SLUA271.
The UC2852D requires a compensation network to ensure stability. The recommended compensation network consists of a series R-C network (R3-C3) connected between the COMP pin and the output voltage. The values of R3 and C3 depend on the output voltage and the desired crossover frequency. TI provides a compensation calculator tool to help designers determine the optimal values for their specific application.
The UC2852D has an absolute maximum input voltage rating of 18V. However, the recommended maximum input voltage is 15V to ensure reliable operation and to prevent damage to the internal components. Exceeding the recommended input voltage may reduce the lifespan of the device or cause it to fail prematurely.
Yes, the UC2852D can be used in a synchronous rectification configuration to improve efficiency. However, this requires additional external components, including a synchronous rectifier FET and a Schottky diode. TI provides an application note (SLUA272) that provides guidance on designing a synchronous rectification circuit with the UC2852D.
The UC2852D has built-in overcurrent protection (OCP) and overvoltage protection (OVP) features. The OCP threshold is set by the RSENSE resistor, and the OVP threshold is set by the VCC voltage. Additionally, designers can add external protection components, such as fuses or TVS diodes, to provide additional protection against fault conditions.
UC2852D datasheet
by Texas Instruments
