UC3871
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
DESCRIPTION
The UC1871 Family of IC’s is optimized for highly efficient fluorescent lamp control. An additional PWM controller is integrated on the IC for applications requiring an additional supply, as in LCD displays. When disabled the IC draws only 1µA, providing a true disconnect feature
, which is optimum for battery powered systems. The switching frequency of all outputs are synchronized to the resonant frequency of the external passive network, which provides Zero Voltage Switching on the Push-Pull drivers.
Soft-Start and open lamp detect circuitry have been incorporated to minimize ponent stress. An open lamp is detected on the pletion of a soft-start cycle.
- Smooth 100% Duty Cycle on Buck PWM and 0% to 95% on
Flyback PWM
The Buck controller is optimized for smooth duty...
