The UC3836D is a high-frequency switching regulator, and proper layout and placement are crucial for its operation. TI recommends a 4-layer PCB with a solid ground plane, and the IC should be placed close to the input capacitors. The output inductor and diode should be placed close to the IC, and the output capacitors should be placed close to the load. A good rule of thumb is to keep the high-current paths short and wide, and to minimize the loop area of the switching node.
The output inductor selection depends on the output voltage, current, and frequency of operation. TI recommends using an inductor with a high saturation current rating, low DC resistance, and a high self-resonant frequency. A good starting point is to use an inductor with an inductance value between 1-10 μH, and a current rating of at least 1.5 times the maximum output current. The inductor should also be shielded to minimize EMI.
The UC3836D has an absolute maximum input voltage rating of 18V, but the recommended maximum input voltage is 15V. Exceeding the recommended maximum input voltage can reduce the reliability and lifespan of the device.
The UC3836D requires a compensation network to ensure stability. TI recommends using a type-III compensation network, which consists of a series resistor and capacitor connected to the COMP pin, and a capacitor connected to the VFB pin. The values of the compensation components depend on the output voltage, current, and frequency of operation, and can be calculated using TI's compensation calculator tool.
The SS pin is the soft-start pin, which allows the output voltage to ramp up slowly during startup. This helps to reduce the inrush current and prevent voltage overshoots. The SS pin can be connected to a capacitor to ground, and the value of the capacitor determines the soft-start time.
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About Texas Instruments
Texas Instruments (TI) designs and manufactures semiconductors and integrated circuits for a wide range of applications. The company's product portfolio includes analog chips, which are essential for managing power and signal functions in electronic devices, and embedded processors, which serve as the brains in various systems, enabling functionality in everything from industrial equipment to consumer electronics. TI's innovations in semiconductor technology have made it a leader in the industry.
