FAN7548GX Fairchild Semiconductor, FAN7548GX Datasheet
FAN7548GX
Specifications of FAN7548GX
Available stocks
Related parts for FAN7548GX
FAN7548GX Summary of contents
Page 1
... P-Channel MOSFET Drive • Open Lamp Regulation(OLR) • Open Lamp Protection(OLP) • Buck+Royer Topology • 20 SSOP ©2003 Fairchild Semiconductor Corporation www.fairchildsemi.com 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 ...
Page 2
FAN7548 Internal Block Diagram ENA Vcc + - 5.2V OUT1 Vz 2uA + OLP1 3.7V - COMP1 2. OLR1 Burst1 Error Amp.1 VFB1 - Css + 2.5V COMP1 OSC1 COMP2 - + 1.5V OLR1 6V ...
Page 3
Pin Assignments Pin Definitions No Name Function Description 1 BDIM Burst Dimming Input 2 BCT Timing Capacitor for Burst Dimming 3 OLP1 Open Lamp Protection 1 4 VFB1 Error Amp Input 1 5 COMP1 Error Amp ...
Page 4
FAN7548 Absolute Maximum Ratings Vcc=12V, Ta=25 C for typical values and -25 C unless otherwise specified. Characteristics Supply Voltage Operating Temperature Range Storage Temperature Range Thermal Resistance Junction-Air (Note1,2) Power Dissipation Note: 1. Thermal resistance test board Size: 76.2mm * ...
Page 5
Electrical Characteristics Vcc=12V, Ta=25 C for typical values and -25 C unless otherwise specified. Characteristics ON/OFF SECTION On Stage Input Voltage SOFT START SECTION Soft Start Charging Current Soft Start Clamping High Voltage UVLO SECTION Start Up Current Start Threshold ...
Page 6
FAN7548 Typical Characteristics On Stage Input Supply Voltage 1.8 1.6 1.4 1.2 1.0 0.8 -60 -40 - Temparature['C] Figure 1. On Stage Input Supply Voltage Soft Start Clamping High Voltage 7.14 6.72 6.30 5.88 -60 -40 -20 ...
Page 7
Typical Characteristics 3V Reference Voltage 3.08 3.04 3.00 2.96 2.92 2.88 -60 -40 - Temparature['C] Figure 7. 3V Reference Voltage Output Source Current 1 -8.5 -6.8 -5.1 -3.4 -60 -40 - Temparature['C] Figure 9. ...
Page 8
FAN7548 Typical Characteristics OSC High Voltage 2.0 1.9 1.8 1.7 1.6 1.5 -60 -40 - Temparature['C] Figure 13. OSC High Voltage Open Lamp Regulation Voltage 1 6.46 6.27 6.08 5.89 5.70 5.51 -60 -40 - ...
Page 9
Typical Characteristics Open Lamp Protection Voltage 2 3.0 2.8 2.6 2.4 2.2 2.0 -60 -40 - Temparature['C] Figure 19. Open Lamp Protection Voltage 2 Output High Voltage 1 12.40 11.78 11.16 10.54 -60 -40 - ...
Page 10
FAN7548 Typical Characteristics Output High Voltage 2 12.40 11.78 11.16 10.54 -60 -40 - Temparature['C] Figure 25. Output High Voltage 2 Output Clamping High Voltage 2 15.00 14.25 13.50 12.75 12.00 -60 -40 - ...
Page 11
Mechanical Dimensions Package Dimensions in millimeters 20-SSOP FAN7548 11 ...
Page 12
... Product number FAN7548G 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. ...