SP4423 SIPEX | Alldatasheet
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SP4423DS/14 SP4423Electroluminescent Lamp Driver © Copyright 2000 Sipex Corporation n 2.2V-5.0V Battery Operation n 50nA Maximum Standby Current n High Voltage Output 160 VPP typical n Internal Oscillator
APPLICATIONS
Electroluminescent Lamp Driver Low Power Applications
DESCRIPTION
The SP4423 is a high voltage output DC-AC converter that can operate from a 2.2V-6.0V power supply. The SP4423 is capable of supplying up to 200 VPP signals, making it ideal for driving electroluminescent lamps. The device features 10nA (typical) standby current, for use in low power portable products. An inductor is used to generate the high voltage, and an external capacitor is used to select the oscillator frequency. The SP4423 is offered in an 8-pin narrow SOIC and 8-pin µSOIC packages. For delivery in die form, please consult the factory. Block Diagram HON VDD CAP 1VSS COIL EL2 EL1 SP4423 CAP 2
SP4423DS/14 SP4423 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. V Input Voltages/Currents Power Dissipation Per Package 8-pin NSOIC (derate 6.14mW 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. This data sheet specifies environmental parameters, final test conditions and limits as well suggested operating conditions. For applications which require performance beyond the specified conditions and or limits please consult the factory. COILVSS VDD EL 1 EL 2 CAP 1 CAP 2 HON SP4423 537A PAD X Y EL1 556.5 179.0 EL2 556.2 -151.0 COIL -19.5 -517.0 -568.0 -517.0 HON -549.0 -256.5 CAP2 -549.0 93.5 CAP1 -568.0 -516.5 -349.0 517.0 NOTES: 1. Dimensions are in Microns unless otherwise noted. 2. Bonding pads are 125x125 typical 3. Outside dimensions are maximum, including scribe area. 4. Die thickness is 10 mils +/- 1. 5. Pad center coordinates are relative to die center. 6. Die size 1447 x 1346 ( 57 x 53 mils). Bonding Diagram: RETEMARAP. NIM. PYT. XAMS TINUS NOITIDNOC V,egatloVylppuS DD 2.20 .30 .6V ,tnerruCylppuSI LIOC I+ DD 5 04 Am V DD V,V0.3= NOH V0.3= V DD V,V0.6= NOH V0.6= V,egatloVlioC LIOC V DD 0.6 V V,egatloVtupnINOH NOH ffoLE:WOL noLE:HGIH 52.0- V DD 52.0- V DD V52.0 V DD 52.0+ V noLE,tnerruCNOH5 2 021 µA V NOH V= DD V0.3= V NOH V= DD V0.6= I,tnerruCnwodtuhS DS I= LIOC I+ DD 01 3.0 002 An µA V DD V,V0.3= NOH V0= V DD V,V0.6= NOH V0= EVIRDROTCUDNI f,ycneuqerFlioC LIOC f= PMAL 23x6 .9z Hk elcyCytuDlioC5 7% I,tnerruClioCkaeP LIOC-KP 06A m. ngisedybdeetnarauG TUPTUOPMALLE f,ycneuqerFpmaLLE PMAL 002 522 003 003 004 054 zH V DD V0.3= V DD V0.6= egatloVtuptuOkaePotkaeP0 110 51V PP SPECIFICATIONS (T= 25°C; VDD = 3.0V; Lamp Capacitance = 6000pF; Coil = 20 mH (RS = 70Ω ); COSC = 150pF unless otherwise noted) VDD VSS
SP4423DS/14 SP4423Electroluminescent Lamp Driver © Copyright 2000 Sipex Corporation THEORY OF OPERATION The SP4423 is made up of three basic circuit elements, an oscillator, coil, and switched H-bridge network. The oscillator provides the device with an on-chip clock source used to control the charge and discharge phases for the coil and lamp. An external capacitor connected between pins 7 and 8 allows the user to vary the oscillator frequency from 32kHz to 400kHz. The graphs on page 6 show the relationship between C OSC and lamp output voltage. In general, increasing the COSC capacitor will increase the lamp output voltage and decrease the lamp frequency. The suggested oscillator frequency is 64kHz OSC =150pF). The oscillator output is internally divided to create two internal control signals, fCOIL and fLAMP . The oscillator output is internally divided down by 8 flip flops; a 64kHz signal will be divided into 8 frequencies; 32, 16, 8, 4, 2, 1, 0.5, and 0.25 Hz. The 3rd flip flop output (8kHz) is used to drive the coil (see Figure 2 on page 9) and the 8th flip flop output (250Hz) is used to drive the lamp. Although the oscillator frequency can be varied to optimize the lamp output, the ratio of f COIL /fLAMP will always equal 32. PIN DESCRIPTION Pin 1 – HON- Enable for driver operation, high = active; low = inactive. Pin 2 – VSS- Power supply common, connect to ground. Pin 3 – Coil- Coil input, connect coil from VDD to pin 3. Pin 4 – Lamp- Lamp driver output2, connect to EL lamp. Pin 5 – Lamp- Lamp driver output1, connect to EL lamp. Pin 6 – V DD - Power supply for driver, connect to system VDD . Pin 7 – Cap1- Capacitor input 1, connect to COSC . Pin 8 – Cap2- Capacitor input 2, connect to COSC . Q Q HON SCR1 SCR2 OSC FF1 FF2 EL Lamp VDD Coil 4 5 EL2 EL1 Cap1 Cap2 VSS VBATTERY VDD 6 3 20mH/70 Ω C OSC = 150pF 0.1µF fCOIL fLAMP fLAMP SP4423 Schematic SP4423
SP4423DS/14 SP4423 Electroluminescent Lamp Driver © Copyright 2000 Sipex Corporation The on-chip oscillator of the SP4423 can be overdriven with an external clock source by removing the COSC capacitor and connecting a clock source to pin 8 (Cap 2). The clock should have a 50% duty cycle and range fromV DD -1V to ground. An external clock signal may be desirable in order to synchronize any parasitic switching noise with the system clock. The maximum external clock frequencies that can be supplied is 400kHz. The coil is an external component connected from V BATTERY to pin 3 of the SP4423 . Energy is stored in the coil according to the equation EL=1/2LI2, where I is the peak current flowing in the inductor. The current in the inductor is time dependent and is set by the "ON" time of the coil switch: I=(V L /L)tON , where VL is the voltage across the inductor. At the moment the switch closes, the current in the inductor is zero and the entire supply voltage (minus the V SAT of the switch) is across the inductor. The current in the inductor will then ramp up at a linear rate. As the current in the inductor builds up, the voltage across the inductor will decrease due to the resistance of the coil and the "ON" resistance of the switch: V L=V BATTERY - IRL -VSAT . Since the voltage across the inductor is decreasing, the current ramp-rate also decreases which reduces the current in the coil at the end of tON the energy stored in the inductor per coil cycle and therefore the light output. The other important issue is that maximum current (saturation current) in the coil is set by the design and manufacturer of the coil. If the parameters of the application such as V BATTERY , L, RL or tON cause the current in the coil to increase beyond its rated ISAT , excessive heat will be generated and the power efficiency will decrease with no additional light output. The Sipex SP4423 is final tested using a 20mH/70Ω coil from CTC. For suggested coil sources see page 10. The supply VDD can range from 2.2 to 6.0V. It is not necessary that Vdd = VBATTERY . VBATTERY should not exceed max coil current specification. The majority of the current goes through the coil and is typically much greater than I DD . The fCOIL signal controls a switch that connects the end of the coil at pin 3 to ground or to open circuit. The f COIL signal is a 75% duty cycle signal, switching at 1/8 the oscillator frequency. For a 64kHz oscillator fCOIL is 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. During the low part of fCOIL , 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 16 of these charge pulses 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 shorter (see Figure 1 on page 9). 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 256. For a 64kHz oscillator, fLAMP =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 16 voltage steps from ground to 80V (typical) on pins 4 and 5 which are 180 degrees out of phase with each other (see Figure 3 on page 9). A differential representation of the outputs is shown in Figure 4 on page 9. To minimize AC interference it is advisable to use a decoupling filter capacitor between V DD and ground. Electroluminescent Technology What is electroluminescence? 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. This approach is large and bulky, and cannot be implemented in most hand held equipment. Sipex now offers low power single chip driver circuits specifically designed to drive small to medium sized electroluminescent panels. All that is required is one external inductor and capacitor.
SP4423DS/14 SP4423Electroluminescent Lamp Driver © Copyright 2000 Sipex Corporation 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 than LEDs or incandescent bulbs making them ideal for battery powered products. Also, EL lamps are able to evenly light an area without creating "hot spots" in the display. Typical SP4423 Application Circuit 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 used and its size. There are many variables which can be optimized for specific applications. Sipex supplies characterization charts to aid the designer in selecting the optimum circuit configuration (see page 6). 0.1µF Low ESR Decoupling Capacitor EL LampNOTE: Keep high voltage traces short and away from V DD and clock lines Cap2 Cap1 VDD EL1 HON VSS Coil EL2 HON=V DD =ON HON=0V=OFF SP4423 VIN=3V 9mH/35 Ω NOTE: Keep coil as close to the SP4423 as possible C OSC =100pF Typical SP4423 Test Circuit 0.1µF Low ESR Decoupling Capacitor NOTE: Keep high voltage traces short and away from V DD and clock lines Cap2 Cap1 VDD EL1 HON VSS Coil EL2 HON=V DD =ON HON=0V=OFF SP4423 VIN=3V 20mH/70 Ω NOTE: Keep coil as close to the SP4422A as possible C OSC =150pF 100Ω 6nF
SP4423DS/14 SP4423 Electroluminescent Lamp Driver © Copyright 2000 Sipex Corporation 800 700 600 500 400 300 200 100 0 50 100 150 200 250 300 350 400 C OSC (pF) Lamp Frequency vs. COSC Lamp Frequency (Hz) X X X X X Coil = 9/35 Coil = 5/18 Coil = 3/10 Coil = 1/14 Inductors X 0 50 100 150 200 250 300 350 400 C OSC (pF) ITOTAL vs. COSC ITOTAL (mA) X Coil = 9/35 Coil = 5/18 Coil = 3/10 Coil = 1/14 Inductors X X X X X X 0 50 100 150 200 250 300 350 400 C OSC (pF) Light vs. COSC Light (FtL) Coil = 9/35 Coil = 5/18 Coil = 3/10 Coil = 1/14 Inductors X X X X X X 250 200 150 100 0 50 100 150 200 250 300 350 400 C OSC (pF) VPEAK vs. COSC VPEAK (V) X Coil = 9/35 Coil = 5/18 Coil = 3/10 Coil = 1/14 Inductors X X X X X X 20.0 18.0 16.0 14.0 12.0 10.0 0.8 0.6 0.0 0 50 100 150 200 250 300 350 400 C OSC (pF) Coil Frequency vs. COSC Coil Frequency (kHz) X X X X X Coil = 9/35 Coil = 5/18 Coil = 3/10 Coil = 1/14 Inductors X 0.4 0.2 VDD (V) ITOTAL vs. VDD over Temperature ITOTAL (mA) O C O C O C 140 120 100 V DD (V) VPEAK vs. VDD over Temperature VPEAK (V) O C O C O C 160 300 250 200 150 100 V DD (V) Lamp Frequency vs. VDD over Temperature Lamp Frequency (Hz) O C O C O C 350 Temperature (oC) Temperature (oC) Temperature (oC) 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. Lamp = 1sq. in., VDD = 3.0V Lamp = 1sq. in., VDD = 3.0V Lamp = 1sq. in., VDD = 3.0V Lamp = 1sq. in., VDD = 3.0V Lamp = 1sq. in., VDD = 3.0V Coil = 20mH/70 ohms, COSC = 150pF Coil = 20mH/70 ohms, COSC = 150pF Coil = 20mH/70 ohms, COSC = 150pF
SP4423DS/14 SP4423Electroluminescent Lamp Driver © Copyright 2000 Sipex Corporation Square Inches ITOTAL vs. Lamp Size ITOTAL (mA) VDD = 2 VDD = 3 VDD = 4 VDD = 5 Supply (V) VDD = 6 250 200 150 100 Square Inches Lamp Frequency vs. Lamp Size Lamp Frequency (Hz)50 VDD = 2 VDD = 3 VDD = 4 VDD = 5 Supply (V) VDD = 6 Square Inches Light vs. Lamp Size Light (FtL) VDD = 2 VDD = 3 VDD = 4 VDD = 5 Supply (V) VDD = 6 160 140 120 100 Square Inches VPEAK vs. Lamp Size VPEAK VDD = 2 VDD = 3 VDD = 4 VDD = 5 Supply (V) VDD = 6 800 600 500 300 Square Inches Lamp Frequency vs. Lamp Size 100 C OSC = 50 C OSC = 75 C OSC = 100 C OSC = 180 Osc Cap C OSC = 220 C OSC = 360 700 400 200 Square Inches ITOTAL vs. Lamp Size C OSC = 50 C OSC = 75 C OSC = 100 C OSC = 180 Osc Cap C OSC = 220 C OSC = 360 160 120 100 Square Inches VPEAK vs. Lamp Size VPEAK C OSC = 50 C OSC = 75 C OSC = 100 C OSC = 180 Osc Cap C OSC = 220 C OSC = 360 140 Square Inches Light vs. Lamp Size Light (FtL) C OSC = 50 C OSC = 75 C OSC = 100 C OSC = 180 Osc Cap C OSC = 220 C OSC = 360 Lamp Frequency (Hz)ITOTAL (mA) C OSC = 220pF, Coil = 9mH/35 ohms C OSC = 220pF, Coil = 9mH/35 ohms C OSC = 220pF, Coil = 9mH/35 ohms C OSC = 220pF, Coil = 9mH/35 ohms VDD = 3.0V, Coil = 9mH/35 ohms VDD = 3.0V, Coil = 9mH/35 ohms VDD = 3.0V, Coil = 9mH/35 ohms VDD = 3.0V, Coil = 9mH/35 ohms
SP4423DS/14 SP4423 Electroluminescent Lamp Driver © Copyright 2000 Sipex Corporation Lamp = 1sq. in., Coil = 9mH/35 ohms Lamp = 1sq. in., Coil = 9mH/35 ohms Lamp = 1sq. in., Coil = 9mH/35 ohms Lamp = 1sq. in., Coil = 9mH/35 ohms VDD (Volts) Light vs. VDD Light (FtL) C OSC = 50 C OSC = 75 C OSC = 100 C OSC = 180 Oscillator Cap X 6.0 C OSC = 220 C OSC = 360X X X X VDD (Volts) VPEAK vs. VDD VPEAK (V) C OSC = 50 C OSC = 75 C OSC = 100 C OSC = 180 Oscillator Cap X 6.0 100 120 160 140 C OSC = 220 C OSC = 360 X X X X X VDD (Volts) ITOTAL vs. VDD ITOTAL (mA) C OSC = 50 C OSC = 75 C OSC = 100 C OSC = 180 Oscilltor Cap X 6.0 C OSC = 220 C OSC = 360 X X X X X 300 Volts Lamp Frequency vs. VDD Lamp Frequency (Hz) C OSC = 50 C OSC = 75 C OSC = 100 C OSC = 180 Oscillator Cap X 200 100 6.0 400 500 600 800 900 700 C OSC = 220 C OSC = 360 X X X XX
SP4423DS/14 SP4423 Electroluminescent Lamp Driver © Copyright 2000 Sipex Corporation 2.5 6.5 Max 9.0 Max 25 ± 2.0 (All dimensions in mm) HITACHI METALS Ltd. Japan Ph: 3-3284-4936 Fax: 3-3287-1945 HITACHI METALS Singapore Ph: 65-222-3077 Fax: 65-222-5232 Part Numbers: MD735L902B (9mH + 20% 41Ω ) MD735L502A (5mH + 20% 19.8Ω ) HITACHI METALS Hong Kong Ph: 852-2724-4183 Fax: 852-2311-2093 HITACHI METALS Chicago, IL Ph: 847-364-7200 Fax: 847-364-7279 Toko Inc. Japan Ph: 03-3727-1161 Fax: 03-3727-1176 Toko America Inc. USA Ph: 847-297-0070 Fax: 847-699-7864 Part Numbers: 667MA-472N (4.7mH, 13Ω ) Toko Inc. Singapore Ph: 255-4000 Fax: 250-8134 Toko Germany Ph: 49-7156-96-060 Fax: 49-7156-96-06-26 Toko U.K. Ph: 1753-854057-9 Fax: 1753-8503-23 Toko Korea Ph: 0551-50-5500 Fax: 0551-93-1110 Toko France Ph: 01-4557-4465 Fax: 01-4554-2837 Toko Hong Kong Ph: 2342-8131 Fax: 2341-9570 (All Dimensions in mm)
4.4 Max
2.75 Max
4.4 5.0 ±0.35.0 ±0.3 5.7 ±0.3 4.7 ±0.3 (All Dimensions in mm) muRata USA Ph: 770-436-1300 Fax: 770-436-3030 muRata Europe Ph: 49-9116-6870 Fax: 49-1166-8722-5 muRata Taiwan Ph: 88-6429-1415-1 Fax: 88-6442-5292-9 muRata Singapore Ph: 65-758-4233 Fax: 65-753-6181 muRata Hong Kong Ph: 85-2237-6389-8 Fax: 85-2237-5556-55 Part Numbers: LQN6C472M04 (4.7mH, 35Ω ) LQN6C103M04 (10mH, 80 Ω ) 7.0 ±0.5 6.0 ±0.33.3 ±0.3 6.8 ±0.3 Coilcraft USA Ph: 847-639-6400 Fax: 847-639-1469 Coilcraft Europe Ph: 44-01236-730595 Fax: 44-01236-730627 Part Numbers: DS1608C-106 (10mH, 32Ω ) Coilcraft Taiwan Ph: 886-2-264-3646 Fax: 886-2-270-0294 Coilcraft Singapore Ph: 65-296-6933 Fax: 465-296-4463 #382 Coilcraft Hong Kong Ph: 852-770-9428 Fax: 852-770-0729 .175 4,45 .260 6,60 MAXMAX .115 2,92 MAX Magnetically Shielded (All Dimensions in mm) (All Dimensions in mm) The coil part numbers presented in this data sheet have been qualified as being suitable for the SP4422A product. Contact Sipex for applications assistance in choosing coil values not listed in this data sheet. CTC Coils LTD Hong Kong Ph: 85-2695-4889 Fax: 85-2695-1842 Mark Technologies: North American Stocking distributor for Sankyo and CTC Ph: 905-891-0165 Fax: 905-891-8534 Model Numbers: CH5070AS-203K-006 (20 m H, 65Ω ) Sipex Number: S51208-M-1021-Sipex
SP4423DS/14 SP4423Electroluminescent Lamp Driver © Copyright 2000 Sipex Corporation EL Lamp manufacturers Metro Mark/Leading Edge Minnetonka, MN Phone: (800) 680-5556 Phone: (612) 912-1700 Midori Mark Ltd. 1-5 Komagata 2-Chome Taita-Ku 111-0043 Japan Phone: 81-03-3848-2011 Luminescent Systems Inc. (LSI) Lebanon, NH Phone: (603) 643-7766 Fax: (603) 643-5947 EL polarizers/transflector manufacturers Nitto Denko San Jose, CA Phone: (510) 445-5400 Astra Products Baldwin, NJ Phone: (516) 223-7500 Fax: (516) 868-2371 NEC Corporation Tokyo, Japan Phone: (03) 3798-9572 Fax: (03) 3798-6134 Seiko Precision Tokyo, Japan Phone: (03) 5610-7089 Fax: .) 5610-7177 Gunze Electronics
2113 Wells Branch Parkway
Austin, TX 78728 Phone: (512) 752-1299 Fax: (512) 252-1181
SP4423DS/14 SP4423 Electroluminescent Lamp Driver © Copyright 2000 Sipex Corporation P W 0.189/0.197 0.014/0.019
0.050 BSC
0.053/0.069 SP4423ACN 0.013 ±0.005 SP4423ACU 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 Pkg. Minimum qty per reel Standard qty per reel Maximum qty per reel ACN 500 2500 3000 ACU 500 2500 3000
95 SP4423ACN per tube, no minimum quantity50 SP4423ACU per tube
NSOIC-8 13" reels: P=8mm, W=12mm µSOIC-8 13" reels: P=8mm, W=12mm All package dimensions in inches 8-pin NSOIC 8-pin µSOIC
SP4423DS/14 SP4423Electroluminescent 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. 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 hereing; neither does it convey any license under its patent rights nor the rights of others. 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