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:
85 °C
Operating Temperature-Min:
-25 °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-Max (Vsup):
29 V
Supply Voltage-Min (Vsup):
10.75 V
Supply Voltage-Nom (Vsup):
12 V
Surface Mount:
NO
Switcher Configuration:
PUSH-PULL
Switching Frequency-Max:
1000 kHz
Technology:
BIPOLAR
Temperature Grade:
OTHER
Terminal Finish:
Nickel/Palladium/Gold (Ni/Pd/Au)
Terminal Form:
THROUGH-HOLE
Terminal Pitch:
2.54 mm
Terminal Position:
DUAL
Width:
7.62 mm
UC2875N Frequently Asked Questions (FAQs)
TI recommends a compact layout with the IC at the center, surrounded by the input and output capacitors. Keep the high-frequency components (e.g., transformer, diodes) away from the IC. Use a solid ground plane and minimize loop areas to reduce EMI.
To minimize standby power, ensure the input voltage is as low as possible, use a low-quiescent-current transformer, and optimize the feedback network to minimize the IC's operating current. Also, consider using a low-dropout linear regulator for the VCC supply.
Choose a transformer with a suitable turns ratio, core material, and wire size to ensure efficient energy transfer. Consider the transformer's leakage inductance, magnetizing inductance, and core losses to optimize the design. TI provides a transformer design guide to help with selection.
Use a soft-start circuit to limit the inrush current during start-up. For shutdown, ensure the input voltage is removed before the output voltage to prevent back-powering the IC. Add a voltage supervisor or reset circuit to ensure the IC is properly reset during power-up and power-down.
The UC2875N has a thermal shutdown feature, but it's essential to ensure good thermal design practices, such as using a heat sink, thermal interface material, and adequate airflow. Keep the IC away from heat sources and ensure the PCB is designed for good thermal conduction.
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UC2875N 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.
