FAN7311B 데이터 시트보기 (PDF) - Fairchild Semiconductor

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FAN7311B

LCD Backlight Inverter Drive IC

Fairchild Semiconductor 

Figure 5. Burst Oscillator Waveform

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 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 sum-

ming 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 shutdown where all output is high.

VIN

8.5V

8.5V

VIN

8.5V

8.5V

Figure 8. Phase-Shift Control Waveforms

© 2007 Fairchild Semiconductor Corporation

FAN7311B Rev. 1.0.0

8

www.fairchildsemi.com

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