PDF SP4491EU Data sheet ( Hoja de datos )

Número de pieza	SP4491EU
Descripción	Two Panel Electroluminscent Lamp Driver
Fabricantes	Sipex
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No Preview Available ! ® SP4491 Two Panel Electroluminscent Lamp Driver s Single IC Drives 2 EL Lamps For Backlighting: • Cell Phone Keypad & LCD • Multi-Color EL Lamps • Multi-Segment EL Lamps s Control Over Lamp-A & Lamp-B For Independent Or Concurrent Operation s +2.2V to +6.0V Battery Operation s Single Coil Used To Generate High Voltage AC Outputs s Low Power Standby Mode Draws 100nA Typical Current s A Single Resistor Controls the Internal Oscillator s DC-AC Inverter Produces Up To 220VPP s Space-Saving 10MSOP Package APPLICATIONS s Cellular Phones s PDA's s Handheld GPS Units s Security Systems DESCRIPTION s POS Terminals The SP4491 electroluminescent lamp driver provides designers of cell phones PDA's and other handheld, portable electronic devices with an integrated solution for driving two EL lamps independently or concurrently. The SP4491 reduces system cost, component count and board space requirements over a discrete 2-EL driver approach. The EL lamps operate in opposite phase so the SP4491 can be easily implemented in applications driving multi-color or multi-segment EL lamps. The SP4491 operates from a +2.2V to +6.0V battery source. The device features a low power standby mode which draws less than 1µA. The frequency of the internal oscillator is set using a single external resistor. A single external inductor is required to generate the high voltage AC outputs to drive the EL lamps. All input pins are ESD protected with internal diodes to VDD and VSS. ELEN1 1 VDD 2 ROSC 3 ELEN2 4 VSS 5 SP4491 10 EL1 9 EL2 8 ELcommon 7 CAP 6 COIL Rev. 12/19/00 SP4491 Two Panel Electroluminescent Lamp Driver 1 © Copyright 2000 Sipex Corporation 1 page DESCRIPTION The SP4491 electroluminescent lamp driver pro- vides designers of cell phones, PDA's and other handheld, portable electronic devices with an integrated solution for driving two EL lamps independently or stimultaneously. The SP4491 reduces system cost, component count and board space requirements over a discrete 2 EL driver approach. The EL lamps operate in opposite phase so the SP4491 can be easily implemented in applications driving multi-color or multi-seg- ment EL lamps. The SP4491 operates from a +2.2V to +6.0V battery source. The device features a low power standby mode that draws less than 1µA. The frequency of the internal oscillator is set using a single external resistor. A single external inductor is required to generate the high voltage AC outputs to drive the EL lamps. All input pins are ESD protected with internal diodes to VDD and VSS. The SP4491 contains a DC-AC inverter that can produce an AC output of 180VPP (typical) from a 3.0V input voltage. An internal block diagram of the SP4491 can be found in Figure 1. VBATT Electroluminescent Technology An EL lamp consists of a thin layer of phospho- rous material sandwiched between two strips of plastic which emits light (flouresces) when a high voltage AC signal is applied across it. It behaves primarily as a capacitive load. Long periods of DC voltage applied to the material tend to reduce its lifetime. With these conditions in mind, the ideal signal to drive an EL lamp is a high voltage sine wave. Traditional approaches to achieve this type of waveform include discrete circuits incorporating a transformer, transistors and several resistors and capacitors. This approach is large and bulky and cannot be implemented in most handheld equipment. Sipex offers low power single chip driver circuits spe- cifically designed to drive small to medium sized electroluminescent panels. Sipex EL drivers provide a differential AC voltage without a DC offset to maximize EL lamp lifetime. The only additional components required for the EL driver circuitry are an inductor, resistor and capacitor. C1 0.1µF ELEN1 ELEN2 ROSC 464kΩ C2* 1nF 1 4 VDD 2 SP4491 COIL 6 ROSC 3 10 8 EL1 ELcommon 7 CAP 5 VSS 9 EL2 * optional device L1 470µH D1 1N4148 CINT 1800pF Figure 2: Typical Application Circuit of SP4491 EL Lamp EL Lamp Rev. 12/19/00 SP4491 Two Panel Electroluminescent Lamp Driver 5 © Copyright 2000 Sipex Corporation 5 Page Coil Manufacturers Hitachi Metals Material Trading Division 2101 S. Arlington Heights Road, Suite 116 Arlington Heights, IL 60005-4142 Phone: 1-800-777-8343 Ext. 12 (847) 364-7200 Ext. 12 Fax: (847) 364-7279 Hitachi Metals Ltd. Europe Immernannstrasse 14-16, 40210 Dusseldorf, Germany Contact: Gary Loos Phone: 49-211-16009-0 Fax: 49-211-16009-29 Hitachi Metals Ltd. Kishimoto Bldg. 2-1, Marunouchi 2-chome, Chiyoda-Ku, Tokyo, Japan Contact: Mr. Noboru Abe Phone: 3-3284-4936 Fax: 3-3287-1945 Hitachi Metals Ltd. Singapore 78 Shenton Way #12-01, Singapore 079120 Contact: Mr. Stan Kaiko Phone: 222-8077 Fax: 222-5232 Hitachi Metals Ltd. Hong Kong Room 1107, 11/F., West Wing, Tsim Sha. Tsui Center 66 Mody Road,Tsimshatsui East, Kowloon, Hong Kong Phone: 2724-4188 Fax: 2311-2095 Murata 2200 Lake Park Drive, Smyrna Georgia 30080 U.S.A. Phone: (770) 436-1300 Fax: (770) 436-3030 Murata European Holbeinstrasse 21-23, 90441 Numberg, Postfachanschrift 90015 Phone: 011-4991166870 Fax: 011-49116687225 Murata Taiwan Electronics 225 Chung-Chin Road, Taichung, Taiwan, R.O.C. Phone: 011 88642914151 Fax: 011 88644252929 Murata Electronics Singapore 200 Yishun Ave. 7, Singapore 2776, Republic of Singapore Phone: 011 657584233 Fax: 011 657536181 Murata Hong Kong Room 709-712 Miramar Tower, 1 Kimberly Road, Tsimshatsui, Kowloon, Hong Kong Phone: 011-85223763898 Fax: 011-85223755655 Panasonic. 6550 Katella Ave Cypress, CA 90630-5102 Phone: (714) 373-7366 Fax: (714) 373-7323 Sumida Electric Co., LTD. 5999, New Wilke Road, Suite #110 Rolling Meadows, IL,60008 U.S.A. Phone: (847) 956-0666 Fax: (847) 956-0702 Sumida Electric Co., LTD. 4-8, Kanamachi 2-Chrome, Katsushika-ku, Tokyo 125 Japan Phone: 03-3607-5111 Fax: 03-3607-5144 Sumida Electric Co., LTD. Block 15, 996, Bendemeer Road #04-05 to 06, Singapore 339944 Republic of Singapore Phone: 2963388 Fax: 2963390 Sumida Electric Co., LTD. 14 Floor, Eastern Center, 1065 King's Road, Quarry Bay, Hong Kong Phone: 28806688 Fax: 25659600 Polarizers/transflector Mnfg. Nitto Denko Yoshi Shinozuka Bayside Business Park 48500 Fremont, CA. 94538 Phone: 510 445 5400 Fax: 510 445-5480 Top Polarizer- NPF F1205DU Bottom - NPF F4225 or (F4205) P3 w/transflector Transflector Material Astra Products Mark Bogin P.O. Box 479 Baldwin, NJ 11510 Phone (516)-223-7500 Fax (516)-868-2371 Rev. 12/19/00 EL Lamp Manufacturers Leading Edge Ind. Inc. 11578 Encore Circle Minnetonka, MN 55343 Phone 1-800-845-6992 Midori Mark Ltd. 1-5 Komagata 2-Chome Taita-Ku 111-0043 Japan Phone: 81-03-3848-2011 Luminescent Systems inc. (LSI) 101 Etna Road Lebanon, NH. 03766-9004 Phone: (603) 448-3444 Fax: (603) 448-3452 NEC Corporation Yumi Saskai 7-1, Shiba 5 Chome, Minato-ku, Tokyo 108-01, Japan Phone: (03) 3798-9572 Fax: (03) 3798-6134 Seiko Precision Shuzo Abe 1-1, Taihei 4-Chome, Sumida-ku, Tokyo, 139 Japan Phone: (03) 5610-7089 Fax: (03) 5610-7177 Gunze Electronics 2113 Wells Branch Parkway Austin, TX 78728 Phone: (512) 752-1299 Fax: (512) 252-1181 SP4491 Two Panel Electroluminescent Lamp Driver 11 © Copyright 2000 Sipex Corporation 11 Page

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