FAN7547AM

FAN7547A LCD Backlight Inverter Drive IC February 2007 FAN7547A LCD Backlight Inverter Drive IC Features Backlight Lamp Ballast and Soft Dimming Reduced Number of Components Wide Range of Operating Voltage (6 to 30V) Precision Voltage Reference Reduced to 3.4% Low Standby Current (Typically 50µA) Soft-Start Function PWM Control Analog, Mixed, and PWM Dimming Function P-Channel MOSFET Drive Open-Lamp Protections (OLP) Shutdown Protections (SDP) 14-Pin SOP Description The FAN7547A provides all control functions for a current-fed, push-pull, self-oscillation type converter and also contains a pulse-width-modulated (PWM) controller to develop a supply voltage. Typical operating frequency range is from 30kHz to 100kHz, depending on the cold cathode fluorescent lamp (CCFL) and the transformer's characteristics. 14-SOP Ordering Information Part Number FAN7547AM FAN7547AMX Package 14-SOP Pb-Free Yes Operating Temperature Range Packing Method -25°C ~ +85°C Tube Tape & Reel © 2005 Fairchild Semiconductor Corporation FAN7547A Rev. 1.0.3 www.fairchildsemi.com FAN7547A LCD Backlight Inverter Drive IC Internal Block Diagram OUT VZ SW Vref 3V VZ VCC Comparator1 UVLO 5V S/S 1.3V RCT Oscillator 120μA Vb 7V Comparator4 Va Comparator5 Vref Vref 0.1V Comparator3 VCC 40μA Comparator2 Internal Bias VCC1 Vref Output Driver Q R S 2μA SDP 3.7V OSC COMP FB Buffer Amplifier OLP Dimming Control and Mode Selection Block VDS Analog PWM Mixed 2V Comparator6 50kΩ Vms 50kΩ 1V Full Lighting when VDS = 3V FAN7547A Rev. 1.01 GND Figure 1. Functional Block Diagram of FAN7547A © 2005 Fairchild Semiconductor Corporation FAN7547A Rev. 1.0.3 2 www.fairchildsemi.com FAN7547A LCD Backlight Inverter Drive IC Pin Configuration OUT 14 VCC1 13 VCC 12 OSC 11 S/S 10 COMP 9 FB 8 FAN7545A 1 GND 2 VDS 3 Vref 4 Vms 5 RCT 6 OLP 7 SDP FAN7547A Rev. 1.00 Figure 2. Pin Configuration (Top View) Pin Definitions Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Name GND VDS Vref Vms RCT OLP SDP FB COMP S/S OSC VCC VCC1 OUT I/O Ground I O I I I I Dimming Voltage Input Reference Voltage Dimming Mode Selection Description Burst Dimming Frequency Set Open-Lamp Protection Shutdown Protection Feedback Input Error Amplifier Output Soft-Start I I I O Main Ct Supply Voltage Output Drive Source Voltage Output Drive © 2005 Fairchild Semiconductor Corporation FAN7547A Rev. 1.0.3 3 www.fairchildsemi.com FAN7547A LCD Backlight Inverter Drive IC Absolute Maximum Ratings Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. -25°C ≤ TA ≤ 85°C and VCC=10V unless otherwise specified. Symbol VCC TJ TA TSTG PD Supply Voltage Parameter Operating Junction Temperature Operating Temperature Range Storage Temperature Range Power Dissipation Value 6 to 30 150 -25 to 85 -65 to 150 0.5 Unit V °C °C °C W © 2005 Fairchild Semiconductor Corporation FAN7547A Rev. 1.0.3 4 www.fairchildsemi.com FAN7547A LCD Backlight Inverter Drive IC Electrical Characteristics Unless otherwise noted, these specifications apply to the operating ambient temperatures for the FAN7547A with -25°C ≤ TA ≤ 85°C and VCC = 10V. Symbol UVLO SECTION VST IST ICC Vref ISS Ipwm fpwm Vpwmh VpwmI Va Vb Va Vb Va Vb Vsa Vsp Vsc Vopen Isd Vsd VOH VOL tr tf VUV Parameter Start Voltage Start Current Operating Current Reference Voltage Soft -Start Charge Current PWM Discharge Current Operating Frequency Osc High Voltage Osc Low Voltage VCC = 4.5V Conditions Min. Typ. Max. Unit 4.9 5.4 50 5.5 2.95 33 48 170 3.05 40 70 200 1.3 0.1 0 3 2.1 0 1.2 0 1.5 0.7 1.2 2.0 1.0 1.5 3.0 2 3.0 9 120 60 2 2.5 2.9 2.5 3.0 3 2.5 1.3 1.8 3.5 3 3.5 10 1 200 120 4 3 5.9 200 8.0 3.15 47 85 230 V μA mA V μA μA Hz V V V V V V V V V V V V μA V V V ns ns V 7V < VCC< 30V TJ = 25°C, Iref = 0mA, 7V < VCC< 30V CSS = 4V CSS = 4V 7V < VCC < 30V REFERENCE SECTION SOFT-START SECTION OSCILLATOR SECTION DIMMING SECTION Analog Dimming Range PWM Dimming Range Mixed Dimming Range Vms > 2V Vms < 1V Vms =1.5V or open MODE SELECTION Analog Dimming Select Voltage PWM Dimming Select Voltage Mixed Dimming Select Voltage Open-Lamp Detect Voltage Shutdown Current Shutdown Voltage Output High Voltage Output Low Voltage Rising Time Falling Time Output Voltage with UVLO Activated VCC = 10V VCC = 10V VCC = 10V VCC = 10V VCC = 4V 7V < VCC < 30V 7V < VCC < 30V OPEN-LAMP PROTECTION 2.5 1 2.5 8 SHUTDOWN PROTECTION OUTPUT SECTION © 2005 Fairchild Semiconductor Corporation FAN7547A Rev. 1.0.3 5 www.fairchildsemi.com FAN7547A LCD Backlight Inverter Drive IC Typical Characteristics Start Voltage vs Temparature 6 5 5.75 4 Start Voltage [V] Start Voltage[V] 0 5 10 15 20 25 30 CC mA] IICC [[mA] 5.50 3 2 5.25 1 5.00 0 -20 0 20 40 60 80 100 VCC V] VCC [[V] Temparature['C] Temperature [°C] Figure 3. Start Voltage Start Current vs Temparature 120 Figure 4. Start Voltage vs. Temperature Reference Voltage vs Temparature 3.15 90 Reference Voltage[V] Reference Voltage [V] -20 0 20 40 60 80 100 3.10 Start Current [μA] Start Current[uA] 60 3.05 30 3.00 0 2.95 -15 0 15 30 45 60 75 90 Temparature['C] Temperature [°C] Temparature['C] Temperature [°C] Figure 5. Output vs. Temperature Soft Start Charge Current vs Temparature Figure 6. Reference Voltage vs. Temperature Operating Frequency vs Temparature 230 Soft-Start ChargeCurrent[uA]μA] Soft Start Charge Current [ 45 Operating Frequency[Hz] [Hz] Operating Frequency -20 0 20 40 60 80 100 220 42 210 200 39 190 36 180 33 170 -20 0 20 40 60 80 100 Temparature['C] Temperature [°C] Temparature['C] Temperature [°C] Figure 7. Soft-Start Charge Current vs. Temperature Figure 8. Operating Frequency vs. Temperature © 2005 Fairchild Semiconductor Corporation FAN7547A Rev. 1.0.3 6 www.fairchildsemi.com FAN7547A LCD Backlight Inverter Drive IC Typical Characteristics (Continued) ShutDown Current vs Temparature ShutDown Voltage vs Temparature 2.8 3.4 Shutdown Current [μA] ShutDown Current[uA] Shutdown Voltage [V] ShutDown Voltage[V] 2.4 3.2 2.0 3.0 1.6 2.8 1.2 -20 0 20 40 60 80 100 2.6 -20 0 20 40 60 80 100 Temperature [°C] Temparature['C] Temperature [°C] Temparature['C] Figure 9. Protection Current vs. Temperature Output High Voltage vs Temparature 10.0 Figure 10. Protection Voltage vs. Temperature Output Low Voltage vs Temparature Output High Voltage [V] Output High Voltage[V] 9.6 9.2 Output LowVoltage[V] [V] Output Low Voltage -20 0 20 40 60 80 100 0.8 0.4 8.8 0.0 8.4 -0.4 8.0 -20 0 20 40 60 80 100 Temparature['C] Temperature [°C] Temparature['C] Temperature [°C] Figure 11. Output High Voltage vs. Temperature Output Voltagewith UVLO Activated[V] [V] Output Voltage with UVLO Activated Output Voltage with UVLO Activated vs Temparature 4.0 Figure 12. Output Low Voltage vs. Temperature 3.5 3.0 2.5 2.0 -20 0 20 40 60 80 100 Temparature['C] Temperature [°C] Figure 13. Output Voltage with UVLO Activated vs. Temperature © 2005 Fairchild Semiconductor Corporation FAN7547A Rev. 1.0.3 7 www.fairchildsemi.com FAN7547A LCD Backlight Inverter Drive IC Package Dimensions 14-SOP Dimensions are in millimeters unless otherwise noted. Figure 14. 14-Lead Small Outline Package (SOP) © 2005 Fairchild Semiconductor Corporation FAN7547A Rev. 1.0.3 8 www.fairchildsemi.com TRADEMARKS The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks. ACEx Across the board. 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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. THESE SPECIFICATIONS DO NOT EXPAND THE TERMS OF FAIRCHILD’S WORLDWIDE TERMS AND CONDITIONS, SPECIFICALLY THE WARRANTY THEREIN, WHICH COVERS THESE PRODUCTS. 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 FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. 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. PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Advance Information Preliminary Product Status Formative or In Design First Production Definition This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. This datasheet contains preliminary data; supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice to improve design. This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice to improve design. This datasheet contains specifications on a product that has been discontinued by Fairchild Semiconductor. The datasheet is printed for reference information only. Rev. I23 2. 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. No Identification Needed Full Production Obsolete Not In Production © 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com