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LT1182 Dataheets PDF



Part Number LT1182
Manufacturers Linear Technology
Logo Linear Technology
Description CCFL/LCD Contrast Switching Regulators
Datasheet LT1182 DatasheetLT1182 Datasheet (PDF)

LT1182/LT1183/LT1184/LT1184F CCFL/LCD Contrast Switching Regulators FEATURES s s s s s s s DESCRIPTION The LT®1182/LT1183 are dual current mode switching regulators that provide the control function for Cold Cathode 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 perm.

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LT1182/LT1183/LT1184/LT1184F CCFL/LCD Contrast Switching Regulators FEATURES s s s s s s s DESCRIPTION The LT®1182/LT1183 are dual current mode switching regulators that provide the control function for Cold Cathode 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 permits 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 , LTC and LT are registered trademarks of Linear Technology Corporation. Wide Input Voltage Range: 3V to 30V Low Quiescent Current High Switching Frequency: 200kHz CCFL Switch : 1.25A, LCD Switch: 625mA Grounded or Floating Lamp Configurations Open-Lamp Protection Positive or Negative Contrast Capability U APPLICATIONS s s s s Notebook and Palmtop Computers Portable Instruments Automotive Displays Retail Terminals TYPICAL APPLICATION 90% Efficient Floating CCFL Configuration with Dual Polarity LCD Contrast UP TO 6mA 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. 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 0µA TO 45µA ICCFL CURRENT GIVES 0mA TO 6mA BULB CURRENT. THIS IS EQUAL TO 0% TO 90% DUTY CYCLE FOR THE PWM SIGNAL. R4 46.4k 1% C6 2.2µF C5 1000pF R2 220k 3 2 1 C3B 2.2µF 35V R1 750Ω 4 5 LAMP 10 6 C2 27pF 3kV L1 CCFL BACKLIGHT APPLICATION CIRCUITS CONTAINED IN THIS DATA SHEET ARE COVERED BY U.S. PATENT NUMBER 5408162 AND OTHER PATENTS PENDING + + C1* 0.068µF R3 100k D5 BAT85 L2 100µH 1 D1 1N5818 + Q1* Q2* D3 1N5934A 4 24V D2 2 1N914 V (PWM) 0V TO 5V 1kHz PWM R5, 43.2k, 1% CCFL PGND ICCFL DIO CCFL VSW BULB BAT LT1182 ROYER VIN FBP FBN LCD VSW 16 15 14 13 2 3 + C7, 1µF 4 5 CCFL VC AGND SHDN LCD VC LCD PGND + 12 11 C9, 0.01µF 10 9 R9, 4.99k, 1% 5V R10, 10k, 1% C4 2.2µF SHUTDOWN 6 C8, 0.68µF 7 R7, 10K 8 R11, 20k, 1% 1182/3 TA01 U U C3A 2.2µF 35V BAT 8V TO 28V 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. L3 6 9 N = 1:2 C11 22µF 35V POSCON C12 2.2µF 35V + NEGCON D4 1N914 R12 20k R13 8.45k 1% C10 0.01µF R14 1.21k 1% VIN ≥ 3V 1 LT1182/LT1183/LT1184/LT1184F DESCRIPTION LT1184/LT1184F pin out the reference for simplified programming of lamp current. The LT1182/LT1183/LT1184/LT1184F operate with input supply voltages from 3V to 30V. The ICs also have a battery supply voltage pin that operates from 4.5V to 30V. The LT1182/LT1183 draw 9mA typical quiescent current while the LT1184/LT1184F draw 6mA typical quiescent current. An active low shutdown pin typically reduces total supply current to 35µA for standby operation. A 200kHz switching frequency minimizes the size of required magnetic components. The use of current mode switching techniques with cycle-by-cycle limiting gives high reliability and simple loop frequency compensation. The LT1182/ LT1183/LT1184/LT1184F are all available in 16-pin narrow SO packages. ABSOLUTE MAXIMUM RATINGS VIN, BAT, Royer, Bulb .............................................. 30V CCFL VSW, LCD VSW ............................................... 60V Shutdown ................................................................. 6V ICCFL Input Current .............................................. 10mA DIO Input Current (Peak, < 100ms) .................... 100mA LT1182: FBP, FBN, LT1183: FB Pin Current......... ± 2mA LT1183/LT1184/1184F: REF Pin Source Current .... 1mA Junction Temperature (Note 1) ............................ 100°C Operating Ambient Temperature Range ..... 0°C to 100°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C PACKAGE/ORDER INFORMATION TOP VIEW CCFL PGND ICCFL DIO CCFL VC AGND SHUTDOWN LCD VC LCD PGND 1 2 3 4 5 6 7 8 16 CCFL VSW 15 BULB 14 BAT 13 ROYER 12 VIN 11 FBP 10 FBN 9 LCD VSW ORDER PART NUMBER LT1182CS S PACKAGE 16-LEAD PLASTIC SO TJMAX = 100°C, θJA = 100°C/W TOP VIEW CCFL PGND ICCFL DIO CCFL VC AGND SHUTDOWN NC NC 1 2 3 4 5 6 7 8 16 CCFL VSW 15 BULB 14 BAT 13 NC 12 VIN 11 REF 10 NC 9 NC ORDER PART NUMBER LT1184CS S PACKAGE 16-LEAD PLASTIC SO TJMAX = 100°C, θJA = 100°C/W Consult factory for Industrial and Military grade parts 2 U U W W W U U W TOP VIEW CCFL PGND ICCFL DIO CCFL VC AGND SHUTDOWN LCD VC LCD PGND 1 2.


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