The UC3572DTR requires a careful PCB design to minimize noise and ensure proper operation. TI recommends a 4-layer PCB with separate power and ground planes, and to keep the switching node (pin 3) away from sensitive analog circuits. A good layout should also include a low-ESR capacitor at the output and a ferrite bead or inductor in series with the input to reduce EMI.
The output capacitor selection depends on the output voltage, current, and ripple requirements. A general rule of thumb is to choose a capacitor with a capacitance value between 10uF to 100uF, and a voltage rating at least 1.5 times the output voltage. Low-ESR capacitors like ceramic or film capacitors are recommended to minimize output ripple and ensure stability.
Although the datasheet specifies a maximum input voltage of 18V, the UC3572DTR can handle up to 20V with some derating. However, it's essential to ensure that the input voltage does not exceed 18V during normal operation to maintain reliability and prevent damage to the device.
The output voltage of the UC3572DTR can be adjusted by changing the resistive divider ratio between the output and the feedback pin (pin 5). The output voltage is determined by the formula: Vout = 2.5V x (R1 + R2) / R2, where R1 and R2 are the resistors in the divider network.
The soft-start pin allows the output voltage to ramp up gradually during startup, reducing inrush current and preventing voltage overshoots. To use the soft-start feature, connect a capacitor between the soft-start pin and ground, and a resistor between the soft-start pin and the input voltage. The capacitor value determines the soft-start time, and the resistor value sets the soft-start current limit.
Trust Checks
This model has been provided by community users.
Community Provided
This model has been verified by system checks.
System Verified
This model has been reviewed by community users.
Community Approved
Sponsored
UC3572DTR Overview
Use the download button to access the UC3572DTR schematic symbol, PCB footprint, and 3D model.
To find more CAD model downloads similar to this part, try a partial part number search, like UC357,
or try a keyword search, such as Switching Regulator or Controllers
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.
