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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LT1183CS датащи(PDF) 14 Page - Linear Technology |
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LT1183CS датащи(HTML) 14 Page - Linear Technology |
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14 / 24 page  14 LT1182/LT1183/LT1184/LT1184F BLOCK DIAGRAM LT1184/LT1184F CCFL Regulator Top Level Block Diagram COMP1 UNDER- VOLTAGE LOCKOUT THERMAL SHUTDOWN 2.4V REGULATOR SHUTDOWN 200kHz OSC SHUTDOWN 6 REF ICCFL AGND DIO BULB CCFL VC CCFL PGND CCFL VSW ROYER BAT VIN LOGIC 1 DRIVE 1 GAIN = 4.4 Q3 2 × Q5 1 × Q4 5 × Q8 1 × Q10 2 × R1 0.125 Ω R4 0.1 Ω LT1184/LT1184F: REFERENCE IS BROUGHT OUT TO PIN 1. PINS 7, 8, 9, 10 ARE NO CONNECT. Q6 2 × R3 1k D2 6V D1 Q11 Q1 13 14 12 Q7 9 × Q9 3 × 11 25 3 15 4 16 1 VREF 1.24V V1 0.465V – + CCFL 0 µA TO 100 µA – + gm – + ILIM AMP1 ANTI- SAT1 1184 BD02 LT1184: HIGH-SIDE SENSE RESISTOR R4 AND GM AMPLIFIER ARE REMOVED. PIN 13 IS NO CONNECT. APPLICATIONS INFORMATION Introduction Current generation portable computers and instruments use backlit Liquid Crystal Displays (LCDs). These displays also appear in applications extending to medical equip- ment, automobiles, gas pumps, and retail terminals. Cold Cathode Fluorescent Lamps (CCFLs) provide the highest available efficiency in backlighting the display. Providing the most light out for the least amount of input power is the most important goal. These lamps require high voltage AC to operate, mandating an efficient high voltage DC/AC converter. The lamps operate from DC, but migration effects damage the lamp and shorten its lifetime. Lamp drive should contain zero DC component. In addition to good efficiency, the converter should deliver the lamp drive in the form of a sine wave. This minimizes EMI and RF emissions. Such emissions can interfere with other devices and can also degrade overall operating efficiency. Sinusoidal CCFL drive maximizes current-to-light conver- sion in the lamp. The circuit should also permit lamp intensity control from zero to full brightness with no hysteresis or “pop-on”. |
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