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| F Semiconductor S6520P LCD Back Light Inverter with Analog Dimming Description The S6520 contains all of the necessary control circuitry to implement a highly efficient cold cathode fluorescent back-light driver and provides a near sinusoidal output voltage and current waveforms for a CCFL. A specially designed integrated circuit provides all control functions for a current fed push-pull converter and contains two PWM(Pulse Width Modulation) control circuits to drive 4 CCFLs for LCD monitor. The S6520 operates at constant frequency in a PWM mode and it has feed forward control method, this function preventing lamp flickering against input voltage step changing. Therefore, even though input voltage is changed suddenly, the lamp current remains constant because of the feed back and feed forward control. Typical operating frequency ranges between 30kHz to 200kHz, dependent upon the CCFL and transformer characteristics. It provides protection functions such as OLP(Open Lamp Protection), SCP(Short Circuit Protection). Features * * * * * * * Complete Dual PWM Power Control Circuitry Internal Soft Start for Soft Lamp lgnition Enable Function to lock the output off until Out Signal is Operational Analog Dimming Function Internal Stable 5V Reference Supply Open Lamp Protection Internal Short Circuit Protection Ordering Information Type NO. S6520P Marking S6520P Package Code DIP-16 Outline Dimensions unit : mm KSI-L016-000 1 Internal Block Diagram Open Lamp Regulation Ct1 1 S6520P 3 OLR1 + Vref Oscillator1 regulation signal to COMP1, COMP2 + + Vref 14 OLR2 9 Vcc Ct2 15 + Vref Oscillator2 5V Vref 7V Vz Internal bias ena Enable Switch + 1.4V 6 ENA CMP1 FB1 5 4 ADIM SS Amplifier 1 + + + Vref iss Comparator 1 + + Output 1 7 OUT1 11 2 FB2 13 Vref Amplifier 2 + + + Comparator 2 + + delay timer Output 2 10 OUT2 CMP2 GND 12 8 Shut Down Signal to Output Q S R 10us + + - from FB1 from FB2 n*Vref 16 reset signal from bias REF Short Circuit Protection PIN Collection Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Symbol CT1 SS OLR1 FB1 CMP1 ENA OUT1 GND VCC OUT2 ADIM CMP2 FB2 OLR2 CT2 REF I/O I I I I I O I O I I I O Pin Function Description Frequency Trimming Capacitor for Main Frequency Setting 1 Initial Soft Start Open Lamp Regulation 1 Feedback 1 (Error Amplifier Negative Input) Error Amplifier Output 1 ON/OFF Control Pin. TTL Signal is Applicable. Output Drive1 Ground Supply Voltage Output Drive 2 Analog Dimming Input Error Amplifier Output 2 Feedback 2 (Error Amplifier Negative Input) Open Lamp Regulation 2 Frequency Trimming Capacitor for Main Frequency Setting 2 Reference Voltage (VREF) = 5V KSI-L016-000 2 S6520P ABSOLUTE MAXIMUM RATINGS CHARACTERISTICS Supply Voltage Power Dissipation Operating Temperature Storage Temperature SYMBOL VCC PD TOPR TSTG VALUE 22 1.5 -25~+85 -40~+125 UNITS V W Electrical Characteristics Ta=25, VCC = 10V, unless otherwise specified. Characteristic REFERENCE SECTION Reference Voltage Line Regulation Load Regulation Temperature Coefficient (note 1) Symbol Vref Vref. LINE Vref. LOAD Vref/T Vref(EA) IB(EA) ISINK ISOURCE VDIM ISS VSSL VSCP VOLR VENA FO Test Condition 8Vcc20 0mAIref5mA -25Ta85 VCMP=2.5V VCMP=2.5V VCMP=2.5V - Min. 4.925 - Typ. 5.0 2.0 1.0 0.01 Max. 5.075 25 15 - Unit V mV mV %/ V uA mA mA V ERROR AMPLIFIER SECTION (EA1, EA2) Inverting Reference Voltage Input Bias Current Output Sink Current Output Source Current Dimming Input Voltage Range SOFT START SECTION Initial Soft Start Current Soft Start Limit Voltage 7.5 4.1 12.5 4.7 17 5.3 uA V 2.4 0.3 -0.3 0 2.5 -0.1 2 -2 2.6 -1.0 2.5 PROTECTION SECTION (SCP1, SCP2 & OLR1, OLR2) SCP Threshold Voltage OLR Threshold Voltage On/Off Threshold Voltage OSCILLATOR SECTION (OSC1, OSC2) Oscillator Frequency Rt=50k, Ct=680pF 45 50 55 kHz 2.55 2.35 1.1 2.7 2.5 1.4 2.85 2.65 1.7 V V V KSI-L016-000 3 S6520P Electrical Characteristics(Continued) Ta=25, VCC = 10V, unless otherwise specified. Characteristic OUTPUT SECTION (OUT1, OUT2) P-CH Output High Voltage P-CH Output Low Voltage Output Rising Time (Note1) Output Falling Time (Note1) START SECTION Stand by Current 8V Stand by Current 20V Operating Current Symbol Test Condition Min. Vcc0.9 Vcc7.5 - Typ. Vcc0.7 Vcc6.0 200 100 Max. Vcc0.4 Vcc4.5 300 200 Unit VPOH VPOL tR tF ISINK=10mA ISOURCE=10mA COUT=0.5nF COUT=0.5nF V V nsec nsec ISB8 ISB20 ICC - - 10 20 4 30 60 6 uA uA mA * Note 1. These parameters, although guaranteed, are not 100% tested in production KSI-L016-000 4 Electrical Characteristic Curves Fig. 1 VCC - ISB Fig. 2 VCC - ICC S6520P Fig. 3 VCC - Vref Fig. 4 Vref(EA) - VCMP Fig. 7 VSCP - VOUT Fig. 8 VENA - ICC KSI-L016-000 5 S6520P These AUK products are intended for usage in general electronic equipments(Office and communication equipment, measuring equipment, domestic electrification, etc.). Please make sure that you consult with us before you use these AUK products in equipments which require high quality and/or reliability, and in equipments which could have major impact to the welfare of human life(atomic energy control, airplane, spaceship, traffic signal, combustion central, all types of safety device, etc.). AUK cannot accept liability to any damage which may occur in case these AUK products were used in the mentioned equipments without prior consultation with AUK. KSI-L016-000 6 |
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