CAN ALSO BE CONFIGURED IN CURRENT MODE; PWM CONTROL TECHNIQUE ALSO POSSIBLE
Analog IC - Other Type:
SWITCHING CONTROLLER
Control Mode:
CURRENT/VOLTAGE-MODE
Control Technique:
RESONANT CONTROL
Input Voltage-Max:
20 V
Input Voltage-Min:
11 V
Input Voltage-Nom:
12 V
JESD-30 Code:
R-PDIP-T20
JESD-609 Code:
e4
Length:
25.4 mm
Number of Functions:
1
Number of Terminals:
20
Operating Temperature-Max:
70 °C
Output Current-Max:
3 A
Output Voltage-Max:
5.08 V
Output Voltage-Min:
4.92 V
Output Voltage-Nom:
5 V
Package Body Material:
PLASTIC/EPOXY
Package Code:
DIP
Package Equivalence Code:
DIP20,.3
Package Shape:
RECTANGULAR
Package Style:
IN-LINE
Qualification Status:
Not Qualified
Seated Height-Max:
5.08 mm
Supply Current-Max (Isup):
30 mA
Supply Voltage-Nom (Vsup):
12 V
Surface Mount:
NO
Switcher Configuration:
PUSH-PULL
Switching Frequency-Max:
1000 kHz
Technology:
BIPOLAR
Temperature Grade:
COMMERCIAL
Terminal Finish:
Nickel/Palladium/Gold (Ni/Pd/Au)
Terminal Form:
THROUGH-HOLE
Terminal Pitch:
2.54 mm
Terminal Position:
DUAL
Width:
7.62 mm
UC3875NG4 Frequently Asked Questions (FAQs)
The UC3875NG4 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 UC3875NG4 is a voltage-mode controller, and it requires compensation to ensure stability. The recommended compensation network consists of a series R-C network from the output of the error amplifier to the compensation pin. The values of the R and C components depend on the specific application, but a good starting point is R = 1kΩ and C = 10nF. The compensation network should be adjusted to achieve a phase margin of at least 45° and a gain margin of at least 10dB.
The UC3875NG4 has an absolute maximum input voltage rating of 30V, but the recommended maximum input voltage is 24V. Exceeding the recommended maximum input voltage can reduce the reliability and lifespan of the device.
Yes, the UC3875NG4 can be used in a synchronous rectification configuration. In this configuration, the internal switch is turned off, and an external FET is used as the synchronous rectifier. This can improve efficiency, especially at high output currents. However, the designer must ensure that the external FET is properly driven and that the gate-source voltage is within the recommended range.
The UC3875NG4 has built-in overcurrent protection, but it is recommended to add external protection circuitry to ensure reliable operation. A fuse or a current-sensing resistor can be used to detect overcurrent conditions, and a voltage supervisor or a zener diode can be used to detect overvoltage conditions. The designer should also ensure that the output voltage is within the recommended range to prevent damage to the load.
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UC3875NG4 Overview
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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.
