FAN7548GX

FAN7548GX Datasheet

FAN7548

Part	Datasheet
FAN7548GX	FAN7548GX (pdf)

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FAN7548 Dual LCD Back Light Inverter Drive IC • Backlight Lamp Ballast and Soft Dimming • Reduce the Number of Components • Wide Range Operating Voltage 9-30V • Precision Voltage Reference Trimmed to • 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 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 2003 Fairchild Semiconductor Corporation FAN7548 Internal Block Diagram 5.2V 3Vref Internal Bias Vz UVLO OUT1 OLP1 3.7V 2.5V COMP1 13.5V Output Drive1 Output Drive2 13.5V ADIM BDIM OUT2 COMP6 3.7V OLP2 2.5V VFB1 COMP1 OSC1 SOLR1 SBurst1 Css Va 2.5V Error Amp.1 Buffer COMP4 COMP2 Ramp Sync. COMP9 Buffer Error Amp.2 + Ordering Information Product number FAN7548G Package 20-SSOP Operating Temperature -25°C ~ 85°C DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: Life support devices or systems are devices or systems which, a are intended for surgical implant into the body, or b support or sustain life, and c whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. 11/4/03 0.0m 001 2003 Fairchild Semiconductor Corporation

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FAN7548

Dual LCD Back Light Inverter Drive IC
• Backlight Lamp Ballast and Soft Dimming
• Reduce the Number of Components
• Wide Range Operating Voltage 9-30V
• Precision Voltage Reference Trimmed to
• 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

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
2003 Fairchild Semiconductor Corporation

FAN7548

Internal Block Diagram
5.2V
3Vref Internal

Bias Vz

UVLO

OUT1

OLP1
3.7V
2.5V

COMP1
13.5V

Output Drive1

Output Drive2
13.5V

ADIM

BDIM

OUT2

COMP6
3.7V

OLP2
2.5V

VFB1

COMP1 OSC1

SOLR1

SBurst1

Css Va
2.5V

Error Amp.1 Buffer

COMP4

COMP2

Ramp Sync.

COMP9

Buffer

Error Amp.2 +
Ordering Information

Product number FAN7548G

Package 20-SSOP

Operating Temperature -25°C ~ 85°C

DISCLAIMER

FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.

LIFE SUPPORT POLICY

FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein:

Life support devices or systems are devices or systems which, a are intended for surgical implant into the body, or b support or sustain life, and c whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user.

A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
11/4/03 0.0m 001 2003 Fairchild Semiconductor Corporation

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Datasheet ID: FAN7548GX 513983