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SP4405
Low Voltage Electroluminescent Lamp Driver with Regulated Output Voltage
s +2.2V to +4.5V Battery Operation s DC-to-AC Converter Produces 160VPP typical for EL Display Panels s Single Resistor Controlled Internal Oscillator s Low Current Standby Mode s Internal Feedback Loop Maintains a Constant Regulated EL Lamp Voltage Output APPLICATIONS s Pagers s Cellular Phones s PDAs DESCRIPTION The SP4405 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 SP4405 will operate from a +2.2V to +4.5V battery source. The device features an internal feedback loop that regulates the lamp voltage output to 160VPP (typical) with varying supply voltages to maintain constant EL lamp brightness over the life of the battery. The device also has a low power shutdown mode which draws less than 50nA (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 set the internal oscillator frequency. The SP4405 is ideal for portable applications such as pagers, cellular phones, PDAs, and other portable applications using LCDs in dim or low light environments. The SP4405 is offered in 8-pin SOIC and 8-pin SOIC packages.
VBATTERY
ELEN 1 VSS 2 COIL 3 EL1 4 SP4405
8 ROSC 7 CINT 6 5 VDD EL2
C1 0.1F
ELEN
1
L1 470H
SP4405
VDD ROSC 450k 6 3 COIL *D1 1N4148
ROSC
8
7
CINT
C2 1nF
2 VSS
4 EL1
5 EL2
CINT 0.1F
EL Lamp
*optional device
SP4405DS/18
SP4405 Low Voltage Electroluminescent Lamp Driver
(c) Copyright 2000 Sipex Corporation
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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, VBATTERY.....................................................................7.0V Input Voltages, ELEN (pin 1)....................................-0.5V to (VDD+0.5V) Lamp Outputs...............................................................................200VPP Operating Temperature...................................................-40C to +85C Storage Temperature....................................................-65C to +150C Power Dissipation Per Package 8-pin NSOIC (derate 6.14mW/oC above +70oC)..................................500mW 8-pin SOIC (derate 4.85mW/oC above +70oC)...................................390mW
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.
SPECIFICATIONS
VBATTERY = 3.0V, L = 470H/3.9, ROSC = 450K, CLAMP = 6.8nF, TAMB = 25OC and CINT = 0.1F unless otherwise noted; refer to test circuit.
PARAMETER Supply Voltage, VDD Supply Current, ICOIL+IDD Coil Voltage, VCOIL ELEN Input Voltage, VELEN LOW: EL off HIGH: EL on Shutdown Current, ISD=ICOIL+IDD INDUCTOR DRIVE Coil Frequency, fCOIL=fLAMPx128 Coil Duty Cycle Peak Coil Current, IPK-COIL EL LAMP OUTPUT EL Lamp Frequency, fLAMP Peak to Peak Output Voltage
MIN. 2.2
TYP. 3.0 39 27
MAX. 4.5 55 70 4.5
UNITS V mA V VDD=3.0V VDD=4.5V
CONDITIONS
VDD -0.25 VDD-0.25 0 VDD 0.1
0.25V VDD+0.25 1.0
V A
VDD=4.5V
48.6 90 60
kHz % mA Guaranteed by design.
320 120 150
380 160
500 190 200
Hz VPP VDD=3.0V VDD=4.5V
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SP4405 Low Voltage Electroluminescent Lamp Driver
(c) Copyright 2000 Sipex Corporation
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TEST CIRCUIT
VBATTERY
Pin 3 -- COIL -- Coil. The inductor for the EL lamp is connected from VBATTERY to this input pin. Pin 4 -- EL1 -- Eluminescent Lamp. This is a lamp driver output pin to connect to the EL lamp. Pin 5 -- EL2 -- Eluminescent Lamp. This is a lamp driver output pin to connect to the EL lamp. Pin 6 -- VDD -- Positive Battery Power Supply. Connect such that +2.2V < VDD < +4.5V.
50 6.8nF
ELEN
1
L1 470H
SP4405
VDD ROSC 750k 6 3 COIL D1 1N4148
ROSC
8
7
CINT
C1 0.1F
C2 1nF
2 VSS
CINT 0.1F 4 EL1 5 EL2
EL Lamp
50
1M
PIN ASSIGNMENTS Pin 1 -- ELEN -- Eluminescent 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 7 -- C INT -- Integrating Capacitor. Connecting a fast recovery diode from COIL (pin 3) to this input pin increases the light output of the EL lamp. An integrating capacitor (0.1F) connected from this pin to ground filters out any coil switching spikes or ripple present in the output waveform to the EL lamp. Pin 8 -- ROSC -- Oscillator Resistor. Connecting a 450k resistor to this input pin sets the frequency of the internal clock.
PINOUT
ELEN 1 VSS 2 COIL 3 EL1 4 SP4405
8 ROSC 7 CINT 6 5 VDD EL2
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SP4405 Low Voltage Electroluminescent Lamp Driver
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DESCRIPTION The SP4405 Electroluminescent Lamp Driver is a low-cost low voltage device ideal for the replacement of LED backlighting designs in keypads, handsets, PDAs and other portable designs. The SP4405 contains a DC-AC inverter that can produce an AC output of 160VPP (typical) from a +2.2V to +4.5V input voltage. An internal feedback loop regulates the lamp voltage output to 160VPP (typical) with varying supply voltages to maintain constant EL lamp brightness. An internal block diagram of the SP4405 can be found in Figure 1. The SP4405 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 six external components are required for the standard operation of the SP4405: an inductor, a fast recovery diode, three capacitors and a resistor. A diagram of the SP4405 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
VBATTERY
SP4405
3 COIL VREF=1.25V
L2 470H, 3
7 CINT ERROR COMPARATOR VDD ROSC 450k 6 SCR1 fCOIL ROSC 8 OSC SCR2
D1* 1N4148
CINT 0.1F
**
C1 0.1F
C2 1nF Q FF7 Q
fLAMP
fLAMP
2 VSS
1 ELEN
4 EL1
5 EL2 EL Lamp
NOTES: * Optional Component ** CINT may be decreased to change the square wave output to a sawtooth waveform.
Figure 1. Internal Diagram of the SP4405
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SP4405 Low Voltage Electroluminescent Lamp Driver
(c) Copyright 2000 Sipex Corporation
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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. This approach is large and bulky and can be difficult to implement in some smaller hand held equipment. Sipex now offers low power single chip driver circuits specifically designed to drive small to medium sized electroluminescent panels. Market Applications Electroluminescent backlighting is ideal when used with LCD displays, keypads, or other backlit readouts. Its main use is to illuminate displays in dim to dark conditions for momentary periods of time. EL lamps typically consume less power than LEDs or incandescent bulbs making them ideal for battery powered products. Also, EL lamps are able to evenly light an area without creating any undesirable "hot spots" in the display. THEORY OF OPERATION The SP4405 is a DC-AC inverter made up of: 1. The Oscillator/Frequency Divider, 2. The Coil, and 3. The Switched H-bridge Network. Further details of each element follow. The Oscillator/Frequency Divider The oscillator provides the SP4405 with an on-chip clock used to control the coil switch (fCOIL) and the H-bridge network (fLAMP and fLAMP). Although the oscillator frequency can be varied to optimize the lamp output, the ratio of fCOIL/ fLAMP will always equal 128. Figure 1 shows the oscillator output driving the coil and the output of the oscillator with 7 flip flops driving the lamp. The suggested oscillator frequency is 48.6kHz (ROSC = 450k) for fCOIL. The oscillator output is internally divided down by 7 flip flops to create a second internal control signal at 380Hz for fLAMP.
VBATTERY
ELEN
1
L1 470H
SP4405
VDD ROSC 450k 6 3 COIL *D1 1N4148
ROSC
8
7
CINT
C1 0.1F
C2 1nF
2 VSS
4 EL1
5 EL2
CINT 0.1F
EL Lamp
*optional device
Figure 2. Typical Application Circuit for the SP4405, Set for a Square Wave Output with CINT = 0.1F
The Coil The supply VBATTERY can range from +2.2V to +4.5V. VBATTERY should be chosen such that ICOIL does not exceed the maximum coil current specification. The majority of the current goes through the coil and is typically much greater than IDD. The coil is an external component connected from VBATTERY to pin 3 of the SP4405. Energy is stored in the coil according to the equation EL=1/2LIP2 where IP, to the first approximation, is the product IP = (tON) (VBATTERY - VCE)/L), where tON is the time it takes for the coil to reach its peak current, VCE is the voltage drop across the internal NPN transistor for fCOIL, and L is the inductance of the coil. When the NPN transistor switch is off, the energy is forced through an internal diode which drives the switched H-bridge network. This energy recovery is directly related to the brightness of the EL lamp output. There are many variations among coils; magnetic material differences, winding differences and parasitic capacitances. For suggested coil suppliers, refer to Page 7. The fCOIL signal controls a switch that connects the end of the coil at pin 3 to ground or to open circuit. The fCOIL signal is a 90% duty cycle signal switching at the oscillator frequency,
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SP4405 Low Voltage Electroluminescent Lamp Driver
(c) Copyright 2000 Sipex Corporation
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35kHz. 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. fCOIL 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 fLAMP signal which is the oscillator frequency divided by 128. For a 48.6kHz oscillator, the 7 flip flops will drive fLAMP= 380Hz. 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 64 voltage steps from ground to 80V (typical) on EL1 and EL2 (pins 4 and 5, respectively) which are 180 degrees out of phase (see Figure 5). A differential representation of the output is shown in Figure 6. The feedback loop connects the H-bridge network to the error comparator through an internal resistor network. When the error comparator senses a lamp voltage below regulation (< 80VP typical), the error comparator enables the oscillator to perform step-up conversions to the lamp output. When the error comparator senses lamp voltages above regulation (> 80VP typical), it disables the oscillator minimizing power consumption until the lamp voltage drops below regulation. With a varying supply voltage, the EL lamp brightness will appear constant as a direct result of this regulated output voltage. Fine Tuning Performance Circuit performance of the SP4405 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 CINT (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. Changing the EL Lamp Output Voltage Waveform: Designers can alter the sawtooth output voltage waveform to the EL Lamp. Increasing the capacitance of the integration capacitor C INT will integrate the sawtooth waveform making it appear more like a square wave. Printed Circuit Board Layout Suggestions: The SP4405'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 CINT in Figure 2 less than 0.2in (5mm) apart. Also keep the connections to COIL (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 VSS (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 25). 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.
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SP4405 Low Voltage Electroluminescent Lamp Driver
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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 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
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
SP4405DS/18
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
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
SP4405 Low Voltage Electroluminescent Lamp Driver
(c) Copyright 2000 Sipex Corporation
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VPEAK = 80V (typ)
EL1 output
Figure 3. EL Output Voltage in Discrete Steps at EL1 Output
128 coil pulses per half cycle; 90% duty cycle.
Figure 4. Voltage Pulses Released from the Coil to the EL Driver Circuitry
EL1 Output
EL2 Output
Figure 5. EL Voltage Waveforms from the EL1 and EL2 Outputs
EL1 Output VP-P = 160V (typ) EL2 Output Differential Representation E12
Figure 6. EL Differential Output Waveform of the EL1 and EL2 Outputs
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SP4405 Low Voltage Electroluminescent Lamp Driver
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The following performance curves are intended to give the designer a relative scale from which to optimize specific applications. Absolute measurements may vary depending upon the brand of components chosen.
700 600
Frequency (Hz)
500 400 300 200 100 0 200 300 400 450 500 600 700 800 900 1.0K 1.1K 1.2K
Resistor / k
Figure 7. Lamp Frequency vs ROSC
250
Oscillator Frequency (kHz)
200
150
100
50
0 100
200
300
400 500 600 Oscillator Resistor
700
800
900
1000
Figure 8. Oscillator Frequency vs ROSC
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SP4405 Low Voltage Electroluminescent Lamp Driver
(c) Copyright 2000 Sipex Corporation
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The following performance curves are intended to give the designer a relative scale from which to optimize specific applications. Absolute measurements may vary depending upon the brand of components chosen.
60
50
40
I TOTAL (mA)
30
20
10
0 200
300
400
450
500
600
700
800
900
1.0K
1.1K
1.2K
ROSC (k)
Figure 9. ITOTAL vs ROSC with/without external diode
50 45 40 35
ICC (mA)
30 25 20 15 10 5 0 1.5 2 2.5 3 3.5 Lamp Size 4 4.5 5
Figure 10. ITOTAL vs Lamp Size
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SP4405 Low Voltage Electroluminescent Lamp Driver
(c) Copyright 2000 Sipex Corporation
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The following performance curves are intended to give the designer a relative scale from which to optimize specific applications. Absolute measurements may vary depending upon the brand of components chosen.
180 160
Output Voltage (VPP)
140 120 100 80 60 40 20 0 100 200 300 400 500 600 700 Oscillator Resistor (k) 800 900 1000
Figure 11. Output Voltage vs ROSC
180 160 140
Output Voltage (V)
120 100 80 60 40 20 0 1.5 2 2.5 3 3.5 Lamp Size (sq.in.) 4 4.5 5
Figure 12. Output Voltage vs Lamp Size (Lamp Capacitance)
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SP4405 Low Voltage Electroluminescent Lamp Driver
(c) Copyright 2000 Sipex Corporation
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The following performance curves are intended to give the designer a relative scale from which to optimize specific applications. Absolute measurements may vary depending upon the brand of components chosen.
25
20
Luminance (cd/m^2)
15
10
5
0 100
200
300
400
500
600
700
800
900
100
Oscillator Resistor (k)
Figure 13. Luminance (cd/m2) vs ROSC
7 6 5
Luminance (fL)
4 3 2 1 0 100
200
300
400
500
600
700
800
900
1000
Oscillator Resistor (k)
Figure 14. Luminance (fL) vs ROSC
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SP4405 Low Voltage Electroluminescent Lamp Driver
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The following performance curves are intended to give the designer a relative scale from which to optimize specific applications. Absolute measurements may vary depending upon the brand of components chosen.
30
25
Luminance (cd/m^2)
20
15
10
5
0 1.5
2
2.5
3
3.5
4
4.5
5
Lamp Size (sq.in.)
Figure 15.
8 7 6 5 4 3 2 1 0 1.5
Luminance (fL)
2
2.5
3
3.5
4
4.5
5
Lamp Size (sq.in.)
Figure 16.
SP4405DS/18
SP4405 Low Voltage Electroluminescent Lamp Driver
(c) Copyright 2000 Sipex Corporation
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The following performance curves are intended to give the designer a relative scale from which to optimize specific applications. Absolute measurements may vary depending upon the brand of components chosen.
500.00 450.00 400.00 350.00
VCE (mV)
250.00 200.00 150.00 100.00 50.00 0.00 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 ICOIL (mA)
Figure 17. VCE vs Coil Current
480 460 440
Frequency (Hz)
420 400 380 360 340 320 300 -40 -20 0 20 Temperature (oC) 40 60 80
Figure 18. Frequency vs Temperature, VDD = 2.2V
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SP4405 Low Voltage Electroluminescent Lamp Driver
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The following performance curves are intended to give the designer a relative scale from which to optimize specific applications. Absolute measurements may vary depending upon the brand of components chosen.
480 460 440
Frequency (Hz)
420 400 380 360 340 320 300 -40 -20 0 20 Temperature (oC) 40 60 80
Figure 19. Frequency vs Temperature, VDD = 3.0V
480 460 440
Frequency (Hz)
420 400 380 360 340 320 300 -40 -20 0 20 Temperature (oC) 40 60 80
Figure 20. Frequency vs Temperature, VDD = 5.0V
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SP4405 Low Voltage Electroluminescent Lamp Driver
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The following performance curves are intended to give the designer a relative scale from which to optimize specific applications. Absolute measurements may vary depending upon the brand of components chosen.
90.0
80.0
70.0 Voltage (V)
60.0
50.0
40.0
30.0 -40
-20
0
20 Temperature (oC)
40
60
80
Figure 21. Peak EL Driver Voltage vs Temperature, VDD = 2.2V
90.0
80.0
70.0
Voltage (V)
60.0
50.0
40.0
30.0 -40
-20
0
20 Temperature (oC)
40
60
80
Figure 22. Peak EL Driver Voltage vs Temperature, VDD = 3.0V
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SP4405 Low Voltage Electroluminescent Lamp Driver
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The following performance curves are intended to give the designer a relative scale from which to optimize specific applications. Absolute measurements may vary depending upon the brand of components chosen.
90.0
80.0
70.0
Voltage (V)
60.0
50.0
40.0
30.0 -40
-20
0
20 Temperature (oC)
40
60
80
Figure 23. Peak EL Driver Voltage vs Temperature, VDD = 5.0V
3.50 3.00 2.50
Current (mA)
2.00 1.50 1.00 0.50 0.00 -40
-20
0
20 Temperature (oC)
40
60
80
Figure 24. EL Driver Current Draw vs Temperature (not including Coil Current), VDD = 3.0V
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SP4405 Low Voltage Electroluminescent Lamp Driver
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The following performance curves are intended to give the designer a relative scale from which to optimize specific applications. Absolute measurements may vary depending upon the brand of components chosen.
400.0 350.0 300.0 250.0 200.0 150.0 100.0 50.0 0.0 -40
Current (nA)
-20
0
20 Temperature (oC)
40
60
80
Figure 25. Leakage Current vs Temperature, VDD = 3.0V
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SP4405 Low Voltage Electroluminescent Lamp Driver
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All package dimensions in inches 8-pin NSOIC 8-pin SOIC
0.189/0.197
0.150/0.157
SP4405EN
0.228/0.244
0.053/0.069
0.0256 BSC 0.012 0.003
12.0 4 0.008 0 - 6 0.006 0.006 0.006 0.006
0.014/0.019 0.050 BSC
0.0965 0.003
1 2
0.020 0.020 1 2
R .003
SP4405EU
0.118 0.004
0.16 0.003 12.0 4 0.01
0.0215 0.006 0.037 Ref
3.0 3
2
0.116 0.004
0.034 0.004 0.040 0.003 0.116 0.004
0.013 0.005 0.118 0.004
0.004 0.002
0.118 0.004
100 die per waffle pack
95 NSOIC devices per tube, no minimum quantity
50 SOIC devices per tube
P
W
8-pin NSOIC 13" reels: P = 8mm, W = 12mm 8-pin SOIC 13" reels: P = 8mm, W = 12mm Pkg. EN EU min qty per reel 500 500 std qty per reel 2500 2500 max qty per reel 3000 3000
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SP4405 Low Voltage Electroluminescent Lamp Driver
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ORDERING INFORMATION
Model Temperature Range Package Type SP4405EN . ............................................ -40C to +85C ......................................... 8-Pin NSOIC SP4405EU . ............................................ -40C to +85C ......................................... 8-Pin SOIC SP4405NEB ..................................................... N/A ........................................... Evaluation Board SP4405UEB ..................................................... N/A ........................................... Evaluation Board
Please consult the factory for pricing and availability on a Tape-On-Reel option.
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
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.
SP4405DS/18
SP4405 Low Voltage Electroluminescent Lamp Driver
(c) Copyright 2000 Sipex Corporation
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