SP4403

SP4403 SIPEX | Alldatasheet

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Technical content

SP4403DS/05 SP4403 Electroluminescent Lamp Driver © Copyright 2000 Sipex Corporation n +2.2V to +4.5V Battery Operation n DC-to-AC Converter Produces Up To 220VPP for EL Display Panels n Single Resistor Controlled Internal Oscillator n Low Current Standby Mode n Features

• High Efficiency Super Driver Architecture
• Uses Small 470µH Coil

APPLICATIONS

Low Voltage Electroluminescent Lamp Driver SP4403 ELEN VDD R OSC VSS COIL EL2 C INT EL1 SP4403

DESCRIPTION

The SP4403 is a high voltage output DC-AC inverter specifically designed to drive electroluminescent lamps to backlight liquid crystal displays, keypads, and backlit readouts used in battery operated portable equipment. The SP4403 will operate from a +2.2V to +4.5V battery source. The device features a low power shutdown mode which draws less than 100nA (typical), ideal for low power portable products. One external inductor is required to generate the high voltage AC output. One external resistor is used to select the internal oscillator frequency. The SP4403 is ideal for portable applications such as cellular phones, PDAs, and other portable applications using LCDs in dim or low light environments. The SP4403 is offered in 8 pin µSOIC packages. R OSC VSS COIL C INT SP4403 VBATT 0.1µF R OSC 450kΩ 470µH ELEN 1N4148 C INT 1800pF optional device VDD EL2EL1 EL Lamp 10nF

SP4403DS/05 SP4403 Electroluminescent Lamp Driver © Copyright 2000 Sipex Corporation ABSOLUTE MAXIMUM RATINGS These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. Power Supply, V Power Dissipation Per Package SPECIFICATIONS RETEMARAP. NIM. PYT. XAMS TINUS NOITIDNOC V,egatloVylppuS DD 2.20 .35 .4V ,tnerruCylppuSI LIOC I+ DD 04 08 Am V DD V= LIOC V0.3+= V DD V= LIOC V5.4+= V,egatloVlioC LIOC V DD 0.5 V V,egatloVtupnINELE NELE ffoLE:WOL noLE:HGIH 52.0- V DD 52.0- V DD V52.0 V DD 52.0+ V I,tnerruCnwodtuhS DS I= LIOC I+ DD 50.00 .1A µV DD V= LIOC V5.4+= EVIRDROTCUDNI f,ycneuqerFlioC LIOC 2.15z Hk elcyCytuDlioC0 9% I,tnerruClioCkaeP LIOC-KP 57A m. ngisedybdeetnarauG TUPTUOPMALLE f,ycneuqerFpmaLLE PMAL 0230 040 05z HV DD V= LIOC V5.4otV2.2= V,egatloVtuptuOkaePotkaeP PP 051 081 091

012 V PP

V DD V= LIOC V0.3+= V DD V= LIOC V5.4+= The information furnished herein by Sipex has been carefully reviewed for accuracy and reliability. Its application or use, however, is solely the responsibility of the user. No responsibility for the use of this information is assumed by Sipex, and this information shall not explicitly or implicitly become part of the terms and conditions of any subsequent sales agreement with Sipex. Specifications are subject to change without prior notice. By the sale or transfer of this information, Sipex assumes no responsibility for any infringement of patents or other rights of third parties which may result from its use. No license or other proprietary rights are granted by implication or otherwise under any patent or patent rights of Sipex Corporation.

SP4403DS/05 SP4403 Electroluminescent Lamp Driver © Copyright 2000 Sipex Corporation PIN ASSIGNMENTS Pin 1 — ELEN — Electroluminescent Lamp Enable. When driven HIGH, this input pin enables the EL driver output EL1 and EL2 (pins 4 and 5, respectively) to the EL lamp. Pin 2 — V SS — Power Supply Common. Connect to the lowest circuit potential, typically ground. Pin 3 — COIL — Coil. The inductor for the EL lamp is connected from V BATT to this input pin. Pin 4 — EL1 — Electroluminescent Lamp. This is a lamp driver output pin to connect to the EL lamp. Pin 5 — EL2 — Electroluminescent Lamp. This is a lamp driver output pin to connect to the EL lamp. Pin 6 — V DD — Positive Battery Power Supply. Connect such that +2.2V < VDD < +4.5V. Pin 7 — C INT — Integrator Capacitor. An Integrator Capacitor (470pF typical) connected from this pin to ground filters out any coil switching spikes or ripple present in the outer waveform to the EL lamp. Connecting a fast recovery diode from COIL (pin 3) to this input pin increases the light output of the EL lamp. Pin 8 — R OSC — Oscillator Resistor. Connecting a 450kΩ resistor to this input pin sets the frequency of the internal clock. PINOUT ELEN VDD R OSC VSS COIL EL2 C INT EL1 SP4403

SP4403DS/05 SP4403 Electroluminescent Lamp Driver © Copyright 2000 Sipex Corporation The SP4403 contains a DC-AC inverter that can produce an AC output of 180VPP from a +2.2V to +4.5V input voltage. An internal block diagram of the SP4403 can be found in Figure 1. The SP4403 is built on Sipex's dielectrically isolated BiCMOS process that provides the isolation required to separate the high voltage AC signal used to drive the EL lamp from the low voltage logic and signal processing circuitry. This ensures latch-up free operation in the interface between the low voltage CMOS circuitry and the high voltage bipolar circuitry. The SP4403 is ideal for applications driving EL lamps to backlight LCD displays, key panels, and other backlit readouts used in battery operated portable equipment. A total of only six external components are required for the standard operation of the SP4403 : an inductor, a fast recovery diode, three capacitors and a resistor. A diagram of the SP4403 in a typical application can be found in Figure 2. Electroluminescent Technology An EL lamp is basically a strip of plastic that is coated with a phosphorous material which emits light (fluoresces) when a high voltage (>40V) which was first applied across it, is removed or reversed. Long periods of DC voltages applied to the material tend to breakdown the material and reduce its lifetime. With these considerations in mind, the ideal signal to drive an EL lamp is a high voltage sine wave. Traditional approaches to achieving this type of waveform included discrete circuits incorporating a transformer, transistors, and several resistors and capacitors. Figure 1. Internal Diagram of the SP4403

SP4403DS/05 SP4403 Electroluminescent Lamp Driver © Copyright 2000 Sipex Corporation The Switched H-Bridge Network The H-bridge consists of two SCR structures that act as high voltage switches. These two switches control the polarity of how the lamp is charged. The SCR switches are controlled by the f LAMP signal which is the oscillator frequency divided by 128. For a 50kHz oscillator, the 7 flip flops will drive fLAMP = 390Hz. When the energy from the coil is released, a high voltage spike is created triggering the SCR switches. The direction of current flow is determined by which SCR is enabled. One full cycle of the H-bridge will create 128 voltage steps from ground to 80V (typical) on EL1 and EL2 (pins 4 and 5, respectively) which are 180 degrees out of phase from each other (see Figure 5). A differential representation of the output is shown in Figure 6. Fine Tuning Performance Circuit performance of the SP4403 can be improved with some of the following suggestions: Increase EL Lamp Light Output : By connecting a fast recovery diode from COIL (pin 3) to C INT (pin 7), the internal diode of the switched H-bridge network is bypassed resulting in an increase in light output at the EL lamp. We suggest a fast recovery diode, such as the industry standard 1N4148, be used for D1. This circuit connection can be found in Figure 2. Square Wave Output Waveform to the EL Lamp: A 470pF capacitor at C INT (pin13) will act as an integrating capacitor, filtering out any coil switching spikes or ripple in the output waveform to the EL lamp (shown if Figure 1). A designer may change the output waveform to a square wave by using a 0.1µF capacitor (shown in Figure 2) at CINT (pin 13). Printed Circuit Board Layout Suggestions: The SP4403 's high-frequency operation makes PC layout important for minimizing ground bounce and noise. Keep the IC's GND pin and the ground leads of C1 and C INT in Figure 2 less than 0.2in (5mm) apart. Also keep the connections to L1 (pin 3) as short as possible. To maximize output power and efficiency and minimize output ripple voltage, use a ground plane and solder the IC's V SS (pin 2) directly to the ground plane. EL Lamp Driver Design Challenges There are many variables which can be optimized for specific applications. The amount of light emitted is a function of the voltage applied to the lamp, the frequency at which it is applied, the lamp material, the lamp size, and the inductor used. Sipex supplies characterization charts to aid the designer in selecting the optimum circuit configuration (see Figures 7 to 14). Sipex will perform customer application evaluations, using the customer's actual EL lamp to determine the optimum operating conditions for specific applications. For customers considering an EL backlighting solution for the first time, Sipex is able to offer retrofitted solutions to the customer's existing LED or non-backlit product for a thorough electrical and cosmetic evaluation. Please contact your local Sales Representative for Sipex or the Sipex factory directly to initiate this valued service.

SP4403DS/05 SP4403 Electroluminescent Lamp Driver © Copyright 2000 Sipex Corporation 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)

4 Lucent Drive

Lebanon, NH. 03766 Phone: (603) 643-7766 Fax: (603) 643-5947 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 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 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,

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 Toko America Inc.

1250 Feehanville Drive

Mt. Prospect, IL, 60056 U.S.A. Phone: (847) 297-0070 Fax: (847) 699-7864 Toko Inc. Europe Burgmullerstr. 7, D-40235 Dusseldorf 1, FR Germany Phone: (0211) 680090 Fax: (0211) 679-9567 Toko Inc. Japan 1-17, Higashi-Yukigaya 2-chome,Ohta-ku, Tokyo 145 Japan Phone: 03-3727-1161 Fax: 03-3727-1176 Toko Inc. Singapore No. 1 Lorong 2. Toa Pavoh. #03-00, Singapore, 319637 Phone: (255) 4000 Fax: (250) 8134 Toko Inc. Hong Kong

45 Hoi Yuen Road, Yau Lee

Centre, 7th, 8th, & 9th Fl., Kwun-Tong Kowloon, Hong Kong Phone: 2348131 Fax: 23419570 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 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

Figure 13. ITOTAL vs Lamp Size, VDD =3.0V, ROSC =450k Ω , Coil=470µH, 4.9Ω

SP4403DS/05 SP4403 Electroluminescent Lamp Driver © Copyright 2000 Sipex Corporation P W 50 µSOIC devices per tube 8-pin µSOIC 13” reels: P = 8mm, W = 12mm Pkg. min qty per reel std qty per reel max qty per reel EU 500 2500 3000 All package dimensions in inches 8-pin µSOIC 0.013 ±0.005 0.0256 BSC 0.118 ±0.004 0.020 0.020 0.116 ±0.004 0.034 ±0.004 0.040 ±0.003 0.004 ±0.0020.118 ±0.004 0.118 ±0.004 0.037 Ref 0.0215 ±0.006 3.0˚ ±3˚ R .003 12.0˚ ±4˚ 0.006 ±0.006 0.006 ±0.006 0.008 0˚ - 6˚ 0.012 ±0.003 0.01 12.0˚ ±4˚ 0.16 ±0.003 0.0965 ±0.003 0.116 ±0.004

SP4403DS/05 SP4403 Electroluminescent Lamp Driver © Copyright 2000 Sipex Corporation

ORDERING INFORMATION

Model Temperature Range Package Type Please consult the factory for pricing and availability on a Tape-On-Reel option. Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described hereins; neither does it convey any license under its patent rights nor the rights of others. Corporation SIGNAL PROCESSING EXCELLENCE Sipex Corporation Headquarters and Sales Office

22 Linnell Circle

Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: sales@sipex.com Sales Office

233 South Hillview Drive

Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600