UC3872
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
- 1µA Disable Current
- 4.5V to 24V Operation
- Open Lamp Detection Circuitry
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 acplished 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 1µA when disabled.
Soft start and open lamp detect circuitry have been incorporated to minimize ponent stresses. Open lamp detection is enabled at the pletion of a soft start cycle. The chip is optimized for smooth duty cycle...
