FAN7311_07 datasheet(8/16 Pages) FAIRCHILD

Part #	FAN7311

Description	LCD Backlight Inverter Drive IC

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

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FAN7311 Rev. 1.0.6

8

Figure 5. Burst Oscillator Waveform

Figure 6. Burst Dimming

Open Lamp Regulation and Open-Lamp Protection: It

is necessary to suspend power stage operation if an

open lamp occurs, because the power stage has high

gain. When a voltage higher than 2V is applied to the

OLR pin, the part enters regulation mode and controls

the EA_OUT voltage. This limits the lamp voltage by

summing 105µA into the feedback node. At the same

time, the OLP capacitor, connected to the OLP pin, is

charged by the 1.4µA internal current source. Once it

reaches 2.5V, the IC enters shut down where all output is

high.

Figure 7. OLR Voltage During Striking Mode

Output Drives: The four output drives are designed so

that switches A and B, C and D never turn on simulta-

neously. The OUTA-OUTB pair is intended to drive one

half-bridge in the external power stage. The OUTC-

OUTD pair drives the other half-bridge.

Figure 8. Phase-Shift Control Waveforms

8.5V

VIN

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