FAN7310_05 FAIRCHILD [Fairchild Semiconductor], FAN7310_05 Datasheet

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FAN7310_05

Manufacturer Part Number
FAN7310_05
Description
LCD Back Light Inverter Drive IC
Manufacturer
FAIRCHILD [Fairchild Semiconductor]
Datasheet
Features
• High Efficiency Single Stage Power Conversion
• Wide Input Voltage Range 5V to 24V
• Back Light Lamp Ballast and Soft Dimming
• Reduce External Components
• Precision Voltage Reference Trimmed to 2%
• ZVS full-bridge topology
• Soft Start
• PWM Control at fixed frequency
• Analog and Burst Dimming Function
• Synchronizable Switching Frequency With An External
• Open Lamp Protection
• Open Lamp Regulation
• 20 Pin SSOP
©2005 Fairchild Semiconductor Corporation
FAN7310
LCD Back Light Inverter Drive IC
Signal
Description
The FAN7310 provides all the control functions for a
series parallel resonant converter and also contains a pulse
width modulation (PWM) controller to develop a supply
voltage. Typical operating frequency range is between
30kHz and 250kHz depending on the CCFL and the
transformer's characteristics.
The FAN7310 has a patent-pending on new phase-shift
control.
20-SSOP
1
www.fairchildsemi.com
Rev. 1.0.2

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FAN7310_05 Summary of contents

Page 1

FAN7310 LCD Back Light Inverter Drive IC Features • High Efficiency Single Stage Power Conversion • Wide Input Voltage Range 5V to 24V • Back Light Lamp Ballast and Soft Dimming • Reduce External Components • Precision Voltage Reference Trimmed ...

Page 2

FAN7310 Internal Block Diagram RT OSCILLATOR max. 2V min. 0.5V CT SYNC EA_OUT 6uA S_S ADIM EA_IN max. 2V min. 0.5V BCT - BDIM + AGND 2 Output - Control + S_S + Error Amp. + UVLO + - Solr ...

Page 3

Pin Assignments SYNC OUTB OLP OLR Pin Definitions No Name Function Description 1 OLP Open Lamp Protection 2 OLR Open Lamp Regulation 3 ENA Enable Input 4 S_S Soft Start 5 GND Analog Ground 6 REF ...

Page 4

FAN7310 Absolute Maximum Ratings For typical values Ta=25°C, Vcc=12V and for min/max values Ta is the operating ambient temperature range with -25°C ≤ Ta ≤ 85°C and 5V ≤ Vcc ≤ 24V, unless otherwise specified. Characteristics Supply Voltage Operating Temperature ...

Page 5

Electrical Characteristics For typical values Ta=25°C, Vcc=12V and for min/max values Ta is the operating ambient temperature range with -25°C ≤ Ta ≤ 85°C and 5V ≤ Vcc ≤ 24V, unless otherwise specified. Characteristics REFERENCE SECTION ( Recommend X7R Capacitor ...

Page 6

FAN7310 Electrical Characteristics For typical values Ta=25°C, Vcc=12V and for min/max values Ta is the operating ambient temperature range with -25°C ≤ Ta ≤ 85°C and 5V ≤ Vcc ≤ 24V, unless otherwise specified. Characteristics OUTPUT SECTION PMOS Gate High ...

Page 7

Function Description UVLO : The under voltage lockout circuit guarantees stable operation of the IC’s control circuit by stopping and starting function of the Vin value. The UVLO circuit turns on the control circuit when Vin exceeds ...

Page 8

FAN7310 Open lamp regulation & 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 ...

Page 9

Timing Diagram FAN7310 use the improved phase-shfit control full-brdige to drive CCFL result, the temperature difference between the left leg and the right legs is almost zero. The detail timing is shown as bellow. EA_OUT CT SYNC T ...

Page 10

FAN7310 Typical Application Circuit VCC C25 100u 0 R24 ENA 10k C28 0 10n REF REF 0 1u(X7R 56k 22k DIM(0~3.3V) C21 R3 10n 20k 4.7n OLP R1 330k Q1 ...

Page 11

Mechanical Dimensions Package Dimensions in millimeters 20-SSOP FAN7310 11 ...

Page 12

FAN7310 Ordering Information Product number FAN7310G 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 ...

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