ALSO HAS CONTROL MODE OF IPK, ALSO HAS CONTROL TECHNIQUE OF RESONANT
Analog IC - Other Type:
SWITCHING CONTROLLER
Control Mode:
CURRENT/VOLTAGE-MODE
Control Technique:
PULSE WIDTH MODULATION
Input Voltage-Max:
20 V
Input Voltage-Min:
11 V
Input Voltage-Nom:
12 V
JESD-30 Code:
R-PDSO-G20
JESD-609 Code:
e4
Length:
12.8 mm
Moisture Sensitivity Level:
2
Number of Functions:
1
Number of Terminals:
20
Operating Temperature-Max:
70 °C
Output Current-Max:
0.1 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:
SOP
Package Equivalence Code:
SOP20,.4
Package Shape:
RECTANGULAR
Package Style:
SMALL OUTLINE
Peak Reflow Temperature (Cel):
260
Qualification Status:
Not Qualified
Seated Height-Max:
2.65 mm
Supply Current-Max (Isup):
35 mA
Surface Mount:
YES
Switcher Configuration:
BUCK-BOOST
Switching Frequency-Max:
300 kHz
Technology:
BIPOLAR
Temperature Grade:
COMMERCIAL
Terminal Finish:
Nickel/Palladium/Gold (Ni/Pd/Au)
Terminal Form:
GULL WING
Terminal Pitch:
1.27 mm
Terminal Position:
DUAL
Time@Peak Reflow Temperature-Max (s):
30
Width:
7.5 mm
UC3879DWTR Frequently Asked Questions (FAQs)
The UC3879DWTR 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 capacitor should be placed close to the load.
The inductor selection depends on the output current, switching frequency, and output voltage. TI recommends using an inductor with a high saturation current rating, low DC resistance, and a high self-resonant frequency. The inductor value can be calculated using the formula: L = (Vin - Vout) / (ΔI * f * Fs), where ΔI is the inductor ripple current, f is the switching frequency, and Fs is the resonant frequency.
The UC3879DWTR 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 IC.
The UC3879DWTR uses a voltage-mode control architecture, and the voltage feedback loop requires compensation to ensure stability. TI recommends using a type-III compensation network, which consists of a series resistor and capacitor, and a parallel capacitor. The compensation values can be calculated using the formula: R1 = (Vout / Vin) * (R2 / R3), where R1 is the series resistor, R2 is the parallel resistor, and R3 is the feedback resistor.
The UC3879DWTR has a maximum junction temperature rating of 150°C. TI recommends derating the IC's power dissipation by 2.5mW/°C above 25°C to ensure reliable operation.
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UC3879DWTR 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.
