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SOIC (DW) 16 77 mm² 10.3 x 7.5 SSOP (DBQ) 16 29 mm² 4.9 x 6
  • 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
  • 1\xB5A Disable Current
  • 4.5V to 24V Operation
  • Open Lamp Detection Circuitry
  • 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
  • 1\xB5A Disable Current
  • 4.5V to 24V Operation
  • Open Lamp Detection Circuitry

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\x92s resonant frequency. Suitable for automotive and battery powered applications, the UC3872 draws only 1\xB5A 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.

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\x92s resonant frequency. Suitable for automotive and battery powered applications, the UC3872 draws only 1\xB5A 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.

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Type Title Date
* Data sheet Resonant Lamp Ballast Controller datasheet 05 Sep 1999
White paper Common LED Functions and LED Driver Design Considerations 21 Sep 2020
Technical article Overcoming challenges for backlight LED drivers in automotive display solutions 16 Jul 2020
Technical article Here's how body electronics and lighting technology are changing the driving experience 26 Sep 2016
Technical article LED brightness adjustment: high-frequency PWM dimming 26 Aug 2016
Technical article Take better selfies with innovative LED flashes 18 Nov 2014
Application note U-141 Resonant Fluorescent Lamp Converter Provides Efficient and Compact 05 Sep 1999

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SOIC (DW) 16 View options
SSOP (DBQ) 16 View options

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