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UCC2973PW Datasheet(PDF) 5 Page - Texas Instruments |
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UCC2973PW Datasheet(HTML) 5 Page - Texas Instruments |
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5 / 24 page  5 UCC1972/3 UCC2972/3 UCC3972/3 UDG-98154 *MODE Output Open Lamp Detection S2 Error Amplifier Output S1 <1V OFF DISABLED OPEN DISCONNECTED FROM COMP OPEN 1V< MODE< 3V ON DISABLED OPEN CONNECTED TO COMP CLOSED >3V ON ENABLED CLOSED CONNECTED TO COMP CLOSED 8 5 3 4 2 1 7 6 VDD 20µA + – + – 1.5V ERROR AMPLIFIER S1 R Q S R Q S + – + – 1.0V 7.0V SYNC OUT RAMP 0.2V OSCILLATOR *MODE SELECT UVLO 4.0V/3.8V 3V REF VREF UVLO=1 3BIT UP-DOWN COUNTER S2 FROM MODE SELECT OPEN LAMP DETECT COMPARATOR ZERO DETECT COMPARATOR UVLO PWM UVLO OUTPUT OFF (FROM MODE SELECT) VDD MODE COMP FB GND OUT BUCK VDD VBAT 18V + – TO S3 OVER-VOLTAGE CLAMP COMPARATOR S3 (ALWAYS OPEN ON UCC3972) FROM CLAMP COMP ICLAMP 9.0V BLOCK DIAGRAM Introduction Cold Cathode Fluorescent Lamps (CCFL) are frequently used as the backlight source for Liquid Crystal Displays (LCDs). These displays are found in numerous applica- tions such as notebook computers, portable instrumenta- tion, automotive displays, and retail terminals. Fluorescent lamps provide superior light output effi- ciency, making their use ideal for power sensitive porta- ble applications where the backlight circuit can consume a significant portion of the battery’s capacity. The backlight converter must produce the high voltage needed to strike and operate the lamp. Although CCFLs can be operated with a DC voltage, a symmetrical AC operating voltage is recommended to maintain the rated life of the lamp. Sinusiodal voltage and current lamp waveforms are also recommended to achieve optimal electrical to light conversion and to reduce high voltage electromagnetic interference (EMI). A topology that pro- vides these requirements while maintaining efficient op- eration is presented below. APPLICATION INFORMATION |
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