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MFG:TI Package Cooled:QFP48
Part Number: UC1872
MFG: TI
Package Cooled: QFP48
Description: The UC3872 is a resonant lamp ballast controller optimized for driving cold cathode fluorescent, neon,...
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UC1872
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DataSheet
General Description
UC1872 General Description
The UC3872 is a resonant lamp ballast controller optimized for driving cold cathode fluorescent, neon, and other gas discharge lamps. The resonant power stage develops a sinusoidal lamp drive voltage, and minimizes switching loss and EMI generation. Lamp intensity adjustment is accomplished with a buck regulator, which is synchronized to the external power stage's resonant frequency. Suitable for automotive and battery powered applications, the UC3872 draws only 1A when disabled.
Soft start and open lamp detect circuitry have been incorporated to minimize component stresses. Open lamp detection is enabled at the completion of a soft start cycle. The chip is optimized for smooth duty cycle control to 100%.
Other features include a precision 1.2% reference, undervoltage lockout, and accurate minimum and maximum frequency control
UC1872 Maximum Ratings
Analog Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 to +10V
VCC, VC Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +24V
ZD Input Current High Impedance Source. . . . . . . . . . . +10mA
ZD Input Voltage Low Impedance Source . . . . . . . . . . . . +24V
Power Dissipation at TA = 25. . . . . . . . . . . . . . . . . . . . . . 1W
Storage Temperature . . . . . . . . . . . . . . . . . . . −65 to +150
Lead Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300
Note 1: Currents are positive into, negative out of the specified terminal.
Note 2: Consult Packaging Section of Databook for thermal limitations and considerations of package.
VCC, VC Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +24V
ZD Input Current High Impedance Source. . . . . . . . . . . +10mA
ZD Input Voltage Low Impedance Source . . . . . . . . . . . . +24V
Power Dissipation at TA = 25. . . . . . . . . . . . . . . . . . . . . . 1W
Storage Temperature . . . . . . . . . . . . . . . . . . . −65 to +150
Lead Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300
Note 1: Currents are positive into, negative out of the specified terminal.
Note 2: Consult Packaging Section of Databook for thermal limitations and considerations of package.
UC1872 Features
• Controls Different Types of Lamps:Cold Cathode Fluorescent, Neon, and Gas Discharge
• Zero Voltage Switching (ZVS) of Push-Pull Drivers
• Accurate Control of Lamp Current
• Variable Lamp Intensity Control
• 1A Disable Current
• 4.5V to 24V Operation
• Open Lamp Detection Circuitry
• Zero Voltage Switching (ZVS) of Push-Pull Drivers
• Accurate Control of Lamp Current
• Variable Lamp Intensity Control
• 1A Disable Current
• 4.5V to 24V Operation
• Open Lamp Detection Circuitry
UC1872 Connection Diagram
UC1872
PDF/DataSheet Download
- Datasheet: UC1872
- File Size: 195247 KB
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