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LT1184 Datasheet(PDF) 1 Page - Linear Technology |
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LT1184 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  1 LT1182/LT1183/LT1184/LT1184F CCFL/LCD Contrast Switching Regulators s Wide Input Voltage Range: 3V to 30V s Low Quiescent Current s High Switching Frequency: 200kHz s CCFL Switch : 1.25A, LCD Switch: 625mA s Grounded or Floating Lamp Configurations s Open-Lamp Protection s Positive or Negative Contrast Capability FEATURES DESCRIPTION APPLICATIONS The LT ®1182/LT1183 are dual current mode switching regulators that provide the control function for Cold Cath- ode Fluorescent Lighting (CCFL) and Liquid Crystal Display (LCD) Contrast. The LT1184/LT1184F provide only the CCFL function. The ICs include high current, high efficiency switches, an oscillator, a reference, output drive logic, control blocks and protection circuitry. The LT1182 per- mits positive or negative voltage LCD contrast operation. The LT1183 permits unipolar contrast operation and pins out an internal reference. The LT1182/LT1183 support grounded and floating lamp configurations. The LT1184F supports grounded and floating lamp configurations. The LT1184 supports only grounded lamp configurations. The s Notebook and Palmtop Computers s Portable Instruments s Automotive Displays s Retail Terminals 90% Efficient Floating CCFL Configuration with Dual Polarity LCD Contrast TYPICAL APPLICATION , LTC and LT are registered trademarks of Linear Technology Corporation. C12 2.2 µF 35V BAT 8V TO 28V POSCON NEGCON 1182/3 TA01 EITHER NEGCON OR POSCON MUST BE GROUNDED. GROUNDING NEGCON GIVES VARIABLE POSITIVE CONTRAST FROM 10V TO 30V. GROUNDING POSCON GIVES VARIABLE NEGATIVE CONTRAST FROM –10V TO – 30V. 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 ICCFL DIO CCFL VC AGND SHDN LCD VC CCFL VSW BULB BAT ROYER VIN FBP FBN LCD VSW CCFL PGND LCD PGND LT1182 LAMP UP TO 6mA 10 6 L1 L3 R1 750 Ω L2 100 µH 3 2 1 5 4 + + + ALUMINUM ELECTROLYTIC IS RECOMMENDED FOR C3B WITH AN ESR ≥ 0.5Ω TO PREVENT DAMAGE TO THE LT1182 HIGH-SIDE SENSE RESISTOR DUE TO SURGE CURRENTS AT TURN-ON. C7, 1 µF C1* 0.068 µF D1 1N5818 D2 1N914 D4 1N914 V (PWM) 0V TO 5V 1kHz PWM SHUTDOWN C8, 0.68 µF R7, 10K C5 1000pF R2 220k R3 100k C3A 2.2 µF 35V C11 22 µF 35V R13 8.45k 1% R14 1.21k 1% 5V R10, 10k, 1% R9, 4.99k, 1% C4 2.2 µF VIN ≥ 3V D3 1N5934A 24V C3B 2.2 µF 35V C2 27pF 3kV + C1 MUST BE A LOW LOSS CAPACITOR, C1 = WIMA MKP-20 Q1, Q2 = ZETEX ZTX849 OR ROHM 2SC5001 L1 = COILTRONICS CTX210605 L2 = COILTRONICS CTX100-4 L3 = COILTRONICS CTX02-12403 *DO NOT SUBSTITUTE COMPONENTS COILTRONICS (407) 241-7876 Q2* Q1* N = 1:2 0 µA TO 45µA ICCFL CURRENT GIVES 0mA TO 6mA BULB CURRENT. THIS IS EQUAL TO 0% TO 90% DUTY CYCLE FOR THE PWM SIGNAL. R12 20k R5, 43.2k, 1% C6 2.2 µF R4 46.4k 1% + D5 BAT85 C10 0.01 µF R11, 20k, 1% C9, 0.01 µF 2 4 6 9 + CCFL BACKLIGHT APPLICATION CIRCUITS CONTAINED IN THIS DATA SHEET ARE COVERED BY U.S. PATENT NUMBER 5408162 AND OTHER PATENTS PENDING |
Similar Part No. - LT1184_15 |
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Similar Description - LT1184_15 |
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