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FAN7548

Fairchild Semiconductor
Part Number FAN7548
Manufacturer Fairchild Semiconductor
Description Dual LCD Back Light Inverter Drive IC
Published Mar 30, 2005
Detailed Description www.fairchildsemi.com Dual LCD Back Light Inverter Drive IC Features • • • • • • • • • • • • • Backlight Lamp Ballast a...
Datasheet PDF File FAN7548 PDF File

FAN7548
FAN7548


Overview
www.
fairchildsemi.
com Dual LCD Back Light Inverter Drive IC Features • • • • • • • • • • • • • Backlight Lamp Ballast and Soft Dimming Reduce the Number of Components Wide Range Operating Voltage 9-30V Precision Voltage Reference Trimmed to 3.
4% Low Standby Current (Typ.
150uA) Soft Start Function Dual PWM Control Analog & Burst Dimming Function P-Channel MOSFET Drive Open Lamp Regulation(OLR) Open Lamp Protection(OLP) Buck+Royer Topology 20 SSOP FAN7548 Description The FAN7548 provides the necessary circuit blocks to implement a highly efficient CCFL backlight power supply in a small footpirnt 20 SSOP package.
The device features two control stages for operating independent resonant tanks for multi-lamp designs.
External parts count is minimized and system cost is reduced by integration such features as a feedback controlled PWM driver stage, the soft start, the open lamp regulation, the open lamp protection, the UVLO, and the self-synchronization circuitry between the buck and Royer stages.
It includes an internal shunt regulator, allowing it to operate with input voltage from 9 to 30V.
It supports analog and burst dimming modes of operation.
It providees the open lamp regulation, and the open lamp protection.
20-SSOP 1 Rev.
1.
0.
0 ©2003 Fairchild Semiconductor Corporation FAN7548 Internal Block Diagram ENA 3Vref V3 Vz Vcc + UVLO 5.
2V GND Vb BDIM Internal Bias Va ADIM OUT1 13.
5V Output Drive1 Output Drive2 13.
5V OUT2 Vz 2uA OLP1 3.
7V 2.
5V S COMP1 Q Q S COMP6 + R R + Vz 2uA OLP2 3.
7V 2.
5V SOLR1 SBurst1 SBurst2 SOLR2 2.
5V COMP1 Ramp Css Ramp OSC1 COMP2 Sync.
Sync.
1.
5V To SOLR1 SOLR2 Max.
1.
75V Min.
0.
25V 6V BCT Vb + - COMP5 To SBurst1 Vcc 10uA Css CSS 6.
5V To SBurst2 (Max.
+Min.
) of BCt + Max.
1.
75V COMP10 + Min.
0.
25V 2 - + - OLR1 COMP3 COMP8 6V + - + COMP7 + + Css Va + + + + VFB1 Error Amp.
1 Buffer COMP4 COMP9 Buffer Error Amp.
2 + + + VFB2 Css Va 2.
5V COMP2 OSC2 1.
5V OLR2 FAN7548 Pin Assignments 20 19 ...


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