SP4414 SIPEX | Alldatasheet
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SP4414DS/17 SP4414 Electroluminescent Lamp Driver © Copyright 2000 Sipex Corporation n Low Power +2.2V to +4.5V Battery Operation n Low-Cost EL Driver Ideal for LED Backlighting Replacement n DC-to-AC Inverter can Produce Over 160VPP for EL Lamps n Requires a 32kHz External Clock Signal n Synchronize EL Driver Operation to Existing System Clock for Portable Applications (i.e. Pagers, Cellular Phones, PDAs, etc.) n Low Current Standby Mode Low Cost Electroluminescent Lamp Driver SP4414
DESCRIPTION
The SP4414 is a high voltage output DC-AC inverter specifically designed to drive electrolu- minescent lamps to backlight liquid crystal displays, keypads, and backlit readouts used in battery operated portable equipment. The SP4414 will operate from a +2.2V to +4.5 V 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. An external clock signal is used to drive the internal control signals for the coil and EL lamp. The SP4414 is ideal for portable applications such as pagers, cellular phones, PDAs, and other portable applications using LCDs in dim or low light environments. The SP4414 is offered in 8-pin SOIC and 8-pin µSOIC packages. VSS CLK EL2 COIL C INT EL1 VDD ELEN SP4414 VSS COIL C INT SP4414 VBATTERY 10nF 2.7mH ELEN *D1 1N4148 C INT 100pF *optional device VDD EL2EL1 EL Lamp 1CLK
SP4414DS/17 SP4414 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 8-pin NSOIC (derate 6.14mW/ SPECIFICATIONS VBATT = 3V, L = 2.7mH, CLAMP = 10nF, and CINT = 100pF unless otherwise noted. RETEMARAP. NIM. PYT. XAMS TINUS NOITIDNOC V,egatloVylppuS DD 2.20 .35 .4V ,tnerruCylppuSI LIOC I+ DD 530 5A m V,egatloVlioC LIOC V DD 5.4 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 1 µA V NELE 52=T,V0= oC ycneuqerFrotallicsOlanretxE2 3z Hk EVIRDROTCUDNI f,ycneuqerFlioC LIOC f= PMAL 23x8 z Hk. elcyCytuD%05,rotallicsOlanretxE elcyCytuDlioC7 8% I,tnerruClioCkaeP LIOC-KP 06A m. ngisedybdeetnarauG TUPTUOPMALLE f,ycneuqerFpmaLLE PMAL 0320 520 72z H egatloVtuptuOkaeP-ot-kaeP6 310 61V PP 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.
SP4414DS/17 SP4414 Electroluminescent Lamp Driver © Copyright 2000 Sipex Corporation PIN ASSIGNMENTS Pin 1 — CLK — Clock. Connect this input pin to an external 32KHz clock sets the frequency of the internal flip flops. Pin 2 — V SS — Power Supply Common. Connect to the lowest circuit potential, typically ground. Pin 3 — EL2 — Eluminescent Lamp. This is a lamp driver output pin to connect to the EL lamp. Pin 4 — COIL — Coil. The inductor for the EL lamp is connected from V BATTERY to this input pin. Pin 5 — C INT — Integrating Capacitor. Connecting a fast recovery diode from COIL (pin 4) to this input pin increases the light output of the EL lamp. An integrating capacitor (100pF) connected from this pin to ground filters out any coil switching spikes or ripple present in the output waveform to the EL lamp. Pin 6 — EL1 — Eluminescent Lamp. This is a lamp driver output pin to connect to the EL lamp. Pin 7— V DD — Positive Battery Power Supply. Connect such that +2.2V < VDD < +4.5V. Pin 8 — ELEN — Eluminescent Lamp Enable. When driven HIGH, this input pin enables the EL driver output EL1 and EL2 (pins 6 and 3, respectively) to the EL lamp. PINOUT VSS CLK EL2 COIL C INT EL1 VDD ELEN SP4414
SP4414DS/17 SP4414 Electroluminescent Lamp Driver © Copyright 2000 Sipex Corporation The SP4414 Electroluminescent Lamp Driver is a low-cost low power device ideal for the replacement of LED backlighting designs. The 32kHz external oscillator drives controls signals for the coil and EL lamp circuitry. The SP4414 32kHz operation is synchronized with existing system clock designs in single cell applications such as pagers, cell phones, PDAs, etc. The SP4414 contains a DC-AC inverter that can produce an AC output of 180V PP (maximum) from a +2.2V to +4.5V input voltage. An external clock provides the SP4414 with the control signals for the coil and EL lamp. An internal block diagram of the SP4414 can be found in Figure 1. The SP4414 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. A total of only four external components are required for the standard operation of the SP4414 : an inductor, a fast recovery diode, and two capacitors. A diagram of the SP4414 in a typical application can be found in Figure 2. Figure 1. Internal Diagram of the SP4414
transistors, and several resistors and capacitors. making them ideal for battery powered products.
- The Frequency Divider, 2. The Coil, and
- The Switched H-bridge Network. Further
details of each element follow. down by a flip flop to drive the coil at 8kHz. winding differences and parasitic capacitances. For suggested coil suppliers, refer to Page 7. Figure 2. Typical Application Circuit for the SP4414
SP4414DS/17 SP4414 Electroluminescent Lamp Driver © Copyright 2000 Sipex Corporation The fCOIL signal controls a switch that connects the end of the coil at pin 1 to ground or to open circuit. The fCOIL signal is a 87% duty cycle signal switching at the oscillator frequency, 8kHz. During the time when the fCOIL signal is HIGH, the coil is connected from VBATTERY to ground and a charged magnetic field is created in the coil. When the fCOIL signal is LOW, the ground connection is switched open, the field collapses, and the energy in the inductor is forced to flow toward the high voltage H-bridge switches. f COIL will send an array of charge pulses (see Figure 4) to the lamp. Each pulse increases the voltage drop across the lamp in discrete steps. As the voltage potential approaches its maximum, the steps become smaller (see Figure 3). 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 external oscillator frequency divided by 128. For a 32kHz oscillator, the 7 flip flops will drive f LAMP = 250Hz. 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 32 voltage steps from ground to 80V (typical) on EL1 and EL2 (pins 6 and 3, respectively) which are 180 degrees out of phase (see Figure 5). A differential representation of the output is shown in Figure 6. Fine Tuning Performance Circuit performance of the SP4414 can be improved with some of the following suggestions: Increase EL Lamp Light Output: B y connecting a fast recovery diode from COIL (pin 4) to C INT (pin 5), 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. Printed Circuit Board Layout Suggestions: The SP4414'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 COIL (pin 4) 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 by the inductor, the frequency at which it is applied, the lamp material, and the lamp size. Sipex supplies characterization charts to aid the designer in selecting the optimum circuit configuration (see Figures 7 to 9). 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.
SP4414DS/17 SP4414 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
specific applications. Absolute measurements may vary depending upon the brand of components chosen. Figure 13. Brightness vs. Frequency
SP4414DS/17 SP4414 Electroluminescent Lamp Driver © Copyright 2000 Sipex Corporation P W 0.189/0.197 0.014/0.019
0.050 BSC
0.053/0.069 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
95 NSOIC devices per tube, no minimum quantity 50 µSOIC devices per tube
8-pin NSOIC 13” reels: P = 8mm, W = 12mm 8-pin µSOIC 13” reels: P = 8mm, W = 12mm Pkg. min qty per reel std qty per reel max qty per reel EN 500 2500 3000 EU 500 2500 3000 SP4414EN SP4414EU All package dimensions in inches 8-pin NSOIC 8-pin µSOIC
SP4414DS/17 SP4414 Electroluminescent Lamp Driver © Copyright 2000 Sipex Corporation
ORDERING INFORMATION
Model Temperature Range Package Type Corporation SIGNAL PROCESSING EXCELLENCE 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 herein; neither does it convey any license under its patent rights nor the rights of others. Please consult the factory for pricing and availability on a Tape-On-Reel option. 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