Texas Instruments UC3871QG3
- Part Number:
- UC3871QG3
- Manufacturer:
- Texas Instruments
- Ventron No:
- 3260393-UC3871QG3
- Description:
- IC FLUORESCENT LAMP DRIVR 20PLCC
- Datasheet:
- UC1871, 2871, 3871
Description
The UC1871 family of ICs is designed for efficient fluorescent lamp control. It features an integrated PWM controller for additional power supply requirements, such as LCD displays. When disabled, the IC consumes only 1μA, providing a true disconnect function for battery-powered systems.
The switching frequency of all outputs is synchronized to the resonant frequency of an external passive network, enabling Zero Voltage Switching (ZVS) on the Push-Pull drivers. Soft-start and open lamp detection circuitry minimize component stress. Open lamp detection occurs at the end of a soft-start cycle.
The Buck controller provides smooth duty cycle control up to 100%, while the flyback controller ensures a maximum duty cycle of 95%. Other features include a precision 1% reference, undervoltage lockout, flyback current limit, and accurate minimum and maximum frequency control.
Features
1μA ICC when disabled
PWM control for LCD supply
Zero Voltage Switched (ZVS) on Push-Pull drivers
Open lamp detect circuitry
4.5V to 20V operation
Non-saturating transformer topology
Smooth 100% duty cycle on Buck PWM and 0% to 95% on Flyback PWM
Applications
Fluorescent lamp control
LCD display power supplies
Battery-powered systems
The UC1871 family of ICs is designed for efficient fluorescent lamp control. It features an integrated PWM controller for additional power supply requirements, such as LCD displays. When disabled, the IC consumes only 1μA, providing a true disconnect function for battery-powered systems.
The switching frequency of all outputs is synchronized to the resonant frequency of an external passive network, enabling Zero Voltage Switching (ZVS) on the Push-Pull drivers. Soft-start and open lamp detection circuitry minimize component stress. Open lamp detection occurs at the end of a soft-start cycle.
The Buck controller provides smooth duty cycle control up to 100%, while the flyback controller ensures a maximum duty cycle of 95%. Other features include a precision 1% reference, undervoltage lockout, flyback current limit, and accurate minimum and maximum frequency control.
Features
1μA ICC when disabled
PWM control for LCD supply
Zero Voltage Switched (ZVS) on Push-Pull drivers
Open lamp detect circuitry
4.5V to 20V operation
Non-saturating transformer topology
Smooth 100% duty cycle on Buck PWM and 0% to 95% on Flyback PWM
Applications
Fluorescent lamp control
LCD display power supplies
Battery-powered systems
Texas Instruments UC3871QG3 technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments UC3871QG3.
- Mounting TypeSurface Mount
- Package / Case20-LCC (J-Lead)
- Surface MountYES
- Number of Pins20
- Operating Temperature0°C~70°C
- PackagingTube
- Part StatusObsolete
- Moisture Sensitivity Level (MSL)2 (1 Year)
- Number of Terminations20
- ECCN CodeEAR99
- HTS Code8542.39.00.01
- SubcategorySwitching Regulator or Controllers
- TechnologyBIPOLAR
- Voltage - Supply4.5V~20V
- Terminal PositionQUAD
- Terminal FormJ BEND
- Number of Functions1
- Terminal Pitch1.27mm
- Frequency57kHz~78kHz
- Base Part NumberUC3871
- Pin Count20
- Input Voltage-Nom5V
- Operating Supply Current8mA
- Nominal Supply Current15mA
- Output Current500mA
- Input Voltage (Min)4.5V
- Control ModeCURRENT-MODE
- Control TechniqueRESONANT CONTROL
- Switcher ConfigurationPUSH-PULL
- DimmingNo
- Height Seated (Max)4.57mm
- Length8.965mm
- Width8.965mm
- RoHS StatusROHS3 Compliant
- Lead FreeLead Free
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