SP4438 [SIPEX]
Ultra-Quiet Electroluminescent Lamp Driver For Cellular Phone Applications; 超静音电致发光灯驱动器为蜂窝电话应用
| 型号： | SP4438 |
| 厂家： | 
SIPEX CORPORATION |
| 描述： | Ultra-Quiet Electroluminescent Lamp Driver For Cellular Phone Applications |
| 文件： | 总19页 (文件大小：225K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
SP4438
Ultra-Quiet Electroluminescent Lamp Driver
For Cellular Phone Applications
ꢀꢀPatent Pending Output Waveshaping
ꢀꢀWaveshaped Output Optimized For Low
Acoustic Noise And Maximum Efficiency
ꢀꢀReduced Supply Current And Standby
Current
ꢀꢀUp to15cd/m2 For Cell Phone Sized EL
Lamps (2 to 3 sq. in.)
ꢀꢀWaveshaped Output And Low Frequency
Operation Minimize Stress On EL Lamp To
Extend Its Lifetime
ꢀꢀUses 820µH, Sub-2mm Coils
ꢀꢀGradual Rising And Falling Edges Minimizes
EMI
ꢀꢀ+2.7V To +3.3V Battery Operation
ꢀꢀSpace-Saving 8-pin MSOP package
APPLICATIONS
ꢀꢀCellular Radios
ꢀꢀWireless Communication Products
DESCRIPTION
The SP4438 device is a low noise, high voltage output DC-AC inverter designed to drive
electroluminescent lamps to backlight liquid crystal display and keypads used in cellular
phones, cordless phones, 2-way radios, and other wireless communication products. The
output waveform of the SP4438 device is ideal for cell phone applications requiring low
acoustic noise performance. One external resistor is used to set the internal oscillator
frequency and one inductor is required to generate the high voltage AC output to drive an EL
lamp up to 3 square inches in size. The SP4438 operates from a +3.0V battery source and
hasalowpowerstandbymodethatdrawslessthan1µA, makingit idealforlow-powercellular
applications. AllinputpinsareESDprotectedwithinternaldiodestoVDD andVSS. TheSP4438
is offered in a space-saving 8-pin MSOP package.
V
BATT
1
2
3
4
8
V
DD
EL1
EL2
L1
2
ELEN
820µH/14Ω
SP4438
ELEN
7
6
5
COIL
SP4438
5
6
D1
1N4148
V
DD
1
3
CINT
ROSC
CINT
R
OSC
714kΩ
ROSC
C
INT
47nF
4
8
7
V
SS
COIL
C1
0.1µF
C2
1nF
V
SS
EL1
EL2
EL Lamp
Rev.11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
© Copyright 2000 Sipex Corporation
1
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.
Supply Voltage (VDD to VSS)........................-0.3V, +5V
Operating Temperature.......................-40˚C to +85˚C
Storage Temperature........................-65˚C to +150˚C
Power Dissipation Per Package
8-pin MSOP
(derate 4.85mW/OC above +70OC).........................400mW
SPECIFICATIONS
VDD = +2.7V to +3.3V, LCOIL = 820µH/14Ω, ROSC = 714kΩ, EL Lamp Load = (8nF + 2.5kΩ)/1MΩ, and TAMB = -40OC to +85OC. TAMB = 25OC for typical
values unless otherwise noted.
PARAMETER
MIN.
TYP.
MAX.
UNITS
CONDITIONS
INPUT CHARACTERISTICS
Supply Voltage, VDD
Supply Current, ICOIL+IDD
Coil Voltage, VCOIL
2.7
VDD
3.0
3.3
30
9
V
mA
V
VDD = +3.0V
ELEN Input Voltage, VELEN
LOW: EL OFF
-0.25
0
0.25V
V
HIGH: EL on
VDD-0.25
VDD
VDD+0.25
ELEN Input Impedance
Shutdown Current, ISD=ICOIL+IDD
INDUCTOR DRIVE
1
3
MΩ
1
µA
VELEN = LOW,VDD = +3.0V
Coil Frequency, fCOIL
26
23
32
90
43
45
ROSC = 714kΩ,TAMB = +25OC
kHz
TAMB = -40OC to +85OC,VDD = +3.0V
Coil Duty Cycle
%
Peak Coil Current, IPK-COIL
EL LAMP OUTPUT
EL Lamp Frequency, fLAMP
100
mA
190
175
250
336
348
T
T
AMB = +25OC,VDD = +3.0V,with load
AMB = -40OC to +85OC
Hz
Peak to Peak Output Voltage, VP-P
130
120
145
140
TAMB = +25OC,VDD = +3.0V,with load
TAMB = -40OC to +85OC
VP-P
dBSPL
ms
Audible Noise
Rise Time
26
TAMB = +25OC,VDD = +3.0V, NOTE 1
TAMB = +25OC,VDD = +3.0V,with load,
measured from 10% to 90%
.55
0.8
1.0
NOTE 1: Audible Noise is measured inside an acoustic sound chamber. The Sound Level Meter is a B&K
Mediator 2238, A-weighted with Condenser Mic type 4188 positioned 1/4 inch above the lamp in an 8 cubic inch
volume. See Figure 5 on page 6.
Rev. 11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
© Copyright 2000 Sipex Corporation
2
PINOUT
1
2
3
4
8
V
DD
EL1
EL2
ELEN
7
6
5
SP4438
ROSC
CINT
V
SS
COIL
PIN ASSIGNMENTS
Pin 6 — CINT — Integrating Capacitor. An
integrating capacitor (47nF typical) con-
nected from this pin to ground filters out any
coil switching spikes or ripple present in the
output waveform to the EL lamp. Connect-
ing a fast recovery diode from COIL to CINT
increases the light output of the EL lamp.
Pin 1 — VDD — Positive Battery Power Supply.
Connect such that +2.7V < VDD < +3.3V.
Pin 2 — ELEN — Electroluminescent Lamp
Enable. When driven HIGH, this input pin
enables the EL driver outputs for EL1 and
EL2. This pin has an internal pulldown
resistor.
Pin 7 — EL2 — Electroluminescent Lamp Out-
put 2. This is a high voltage lamp driver
output pin to connect to the EL lamp.
Pin 3 — ROSC — Oscillator Resistor. Connect-
ing a resistor to this input pin sets the fre-
quency of the internal clock.
Pin 8 — EL1 — Electroluminescent Lamp Out-
put 1. This is a high voltage lamp driver
output pin to connect to the EL lamp.
Pin 4 — VSS — Power Supply Common. Con-
nect to the lowest circuit potential, typically
ground.
Pin 5 — COIL — The inductor for the EL lamp
is connected from VDD to this input pin.
Rev.11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
© Copyright 2000 Sipex Corporation
3
V
BATT
L1
2
ELEN
820µH/14Ω
SP4438
COIL
5
6
D1
V
DD
1N4148
1
3
CINT
R
OSC
714kΩ
ROSC
CINT
47nF
8
7
4
C1
0.1µF
C2
1nF
V
SS
EL1
EL2
EL Lamp
Figure 1: Typical Operating Circuit for the SP4438.
Note: C1 should be close to L1.
Rev. 11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
© Copyright 2000 Sipex Corporation
4
V
BATT
V
DD
L1
1
820µH/14Ω
5
6
COIL
D1
1N4148
SP4438
CINT
R
OSC
714kΩ
3
ROSC
C
INT
OSC
47nF
C1
0.1µF
C2
1nF
PMOS
DMOS
PMOS
BRIDGE
CONTROL
Q
Q
FF7
DMOS
ELEN
2
8
7
4
EL1
EL2
VSS
EL Lamp
Figure 2: Internal Block Diagram of the SP4438
Figure 3: EL Differential Output Waveform of the EL1 and EL2 Outputs of the SP4438
Rev.11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
© Copyright 2000 Sipex Corporation
5
EL Lamp Noise Measurement Set-Up
1”
2”
Microphone
Type 4188
Bruel & Kjaer
2238 Mediator
A-Weighting
dBSPL
Measurement
4”
Photometer
Tek-J17
Aux 1
Anechoic Chamber
HP8903A Audio Analyzer - SPCL 3.1, 1.17
Preamplifier with 30kHz High Pass Filter
Differential
Voltage Probe
Current
Probe
Monitor
Tek754C Digital Osciliscope
Voltage Waveform Measurements
EL Driver
Figure 4: Dual Supply Application Circuit for the SP4438
EL Lamp Noise Measurement Set-Up
1”
2”
Microphone
Type 4188
Bruel & Kjaer
2238 Mediator
A-Weighting
dBSPL
Measurement
4”
Photometer
Tek-J17
Aux 1
Anechoic Chamber
HP8903A Audio Analyzer - SPCL 3.1, 1.17
Preamplifier with 30kHz High Pass Filter
Differential
Voltage Probe
Current
Probe
Monitor
Tek754C Digital Osciliscope
Voltage Waveform Measurements
EL Driver
Figure 5. Electroluminescent Lamp Noise Measurement Setup for the SP4438
Rev. 11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
© Copyright 2000 Sipex Corporation
6
indimtodarkconditionsformomentaryperiods
of time. EL lamps 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.
DESCRIPTION
TheSP4438ElectroluminescentLampDriveris
a low-cost low voltage device ideal for the
replacement of LED backlighting designs in
cell phones, PDAs and other portable designs
desiring low acoustic noise. The SP4438
contains a DC-AC inverter that can produce an
AC output of 145VP-P (typical) from a +2.7V to
+3.3Vinputvoltage. Aninternalblockdiagram
of the SP4438 can be found in Figure 2.
THEORY OF OPERATION
The SP4438 is a DC-AC inverter made up of:
1. The Oscillator/Frequency Divider, 2. The
Coil/Boost Converter, 3. The Switched H-
bridge Network, and 4. The Precision Bridge
Control Logic. Further details of each element
follow.
The SP4438 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
lowvoltagelogicandsignalprocessingcircuitry.
This ensures latch-up free operation in the
interface between the low voltage CMOS
circuitry and the high voltage bipolar circuitry.
The SP4438 is ideal for applications driving EL
lamps to backlight LCD displays and keypads,
used in cellular radios.
The Oscillator/Frequency Divider
The oscillator provides the SP4438 with an on-
chip clock used to control the coil switch (fCOIL
)
and the H-bridge network (fLAMP ). Although the
oscillator frequency can be varied to optimize
the lamp output, the ratio of fCOIL/fLAMP will
always equal 128.
Figure 2 shows the oscillator output driving the
coil and through 7 flip flops, driving the lamp.
The suggested oscillator frequency is 32kHz for
fCOIL. The oscillator output is internally divided
down by 7 flip flops to create a second internal
A total of only six external components are
requiredforthestandardoperationoftheSP4438:
an inductor, a fast recovery diode, three
capacitors and a resistor. A diagram of the
SP4438 in a typical application can be found in
Figure 1.
control signal at 250Hz for fLAMP
.
The Coil/Boost Converter
Electroluminescent Technology
The supply VCOIL can range from +2.7V to +9V.
See figure 4 on page 6. VCOILshould 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.
An EL lamp is a strip of plastic that is coated
with a phosphorous material which emits light
(fluoresces)whena(>40V)ACsignalisapplied
across it. Long periods of DC voltages applied
to the lamp tends 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.
Sipexofferslowpowersinglechipdrivercircuits
specifically designed to drive small to medium
sized electroluminescent panels.
Theinductorisanexternalcomponentconnected
from V
to the COIL pin of the SP4438.
Energy CiOsILstored in the coil according to the
equation
2
EL = 1/2 x L x IP
whereIP,tothefirstapproximation,istheproduct
IP = (tON) x ((VBATT - VCE)/L)
Market Applications
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 and L is the
Electroluminescent backlighting is ideal when
usedwithLCDdisplays,keypads,orotherbacklit
readouts. Its main use is to illuminate displays
Rev.11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
© Copyright 2000 Sipex Corporation
7
inductance of the coil. When the NPN transistor
switch is off, the energy is forced through an
internal diode which drives the switched H-
bridgenetwork. Thisenergyrecoveryisdirectly
related to the brightness of the EL lamp output.
Therearemanyvariationsamongcoils;magnetic
material differences, winding differences and
parasitic capacitances.
Increase EL Lamp Light Output: By
connecting a fast recovery diode from COIL
(pin 5) to C (pin 6), the internal diode of the
switchedH-IbNrTidgenetworkisbypassedresulting
in an increase in light output at the EL lamp. We
suggestafastrecoverydiode,suchastheindustry
standard 1N4148, be used for D1. This circuit
connection can be found in Figure 2.
The fCOIL signal controls a switch that connects
the coil at the COIL pin to ground or to open
circuit. The fCOIL signal is a 90% duty cycle
signal switching at the oscillator frequency,
32kHz. During the time when the fCOIL signal is
HIGH,thecoilisconnectedfromV toground
and a charged magnetic field is cCrOeIaLted in the
Split Power Supplies: Instead of driving
boththelogicandpowercircuitryoftheSP4438
fromasinglebatterysupply, twosuppliescanbe
implemented, one to drive the IC and the other
to drive the inductor.
The +2.7V to +3.3V power supply is connected
to VCC. This power supply can be used to power
the oscillator and control logic. The current
draw on this power supply will be minimal,
typically <1mA for SP4438.
coil. When the f
signal is LOW, the ground
connectionisswiCtcOhILedopen, thefieldcollapses,
and the energy in the inductor is forced to flow
toward the high voltage H-bridge switches.
The Switched H-Bridge Network
Current sources and precision controlled timing
of the SP4438 switched H-bridge network are
designed to reduce EMI emissions, extend EL
lamp life, and reduce the overall power
dissipation of the device.
Whenselectingaseparate+2.7Vto+9.0Vpower
supply connected to the inductor to drive the IC
power circuitry, it is essential that the proper
inductor is selected. The peak current draw of
the inductor should not exceed maximum
conditionsovertheentireinputvoltageoperating
range.
Current sources were added to the high and low
sideoftheH-bridgenetworktoensurecontrolof
the charge and discharge of the EL lamp. The
precisionMOSFETtimingoftheSP4438allows
for controlled charging and discharging of the
EL lamp to minimize EMI and audible noise.
Refer to Figure 7 for the single ended and
differential output waveforms to the EL lamp.
If the inductor selected is too large, the power
current may rise too slowly. At low input
voltages, this will not allow the peak current to
rise to the set peak current trip point. At high
input voltages, the power current might rise too
quickly and overshoot the set peak current trip
point. These conditions will prevent optimal
light output at the EL lamp. Excessive currents
may permanently affect the normal operation of
the SP4438.
The Precision Bridge Control Circuitry
This circuitry is driven by the internal oscillator
to control the timing of the charge and discharge
of the EL lamp to eliminate EMI and noise
concerns. This control circuitry drives the H-
bridge timing. Refer to Figure 2 for the internal
block diagram of the SP4438.
Changing the EL Lamp Output Voltage
Waveform: Designerscanalterthetrapezoidal
output voltage waveform to the EL Lamp.
Changing the capacitance of the integrating
capacitor, CINT, will ideally integrate the output
waveform making it appear more sinusoidal.
This will minimize any noise inherent to the
application.
Fine Tuning Performance
Circuit performance of the SP4438 can be
improved with some of the following
suggestions:
Rev. 11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
© Copyright 2000 Sipex Corporation
8
emittedisafunctionofthevoltageappliedtothe
lamp, 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.
Audio Noise Considerations: A system
can have different sources of audio noise. The
coil, the filter capacitor, and the EL lamp itself
may be a source of audio noise if operated in the
audio frequency range.
Sipex will perform customer application
evaluations,usingthecustomer'sactualELlamp
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. Refer to Figure 6 for an
enlargement and actual size evaluation board
layout. Please contact your local Sales
Representative for Sipex or the Sipex factory
directly to initiate this valued service.
Designers should select either the coil or coil
frequency such that the coil is not in continous
modeasthiswillgreatlydecreaseefficiencyand
contribute to noise.
Close attention should be given to the mounting
of the filter capacitor where the mounting can
act as an amplifier, such as in a speaker box.
Film capacitors do not exhibit audio noise
concernsbutcertainceramiccapacitorssubjected
to a high voltage source can exhibit a
piezoelectric effect. This can be a source of
concern in the audio range.
TheELlampitselfcanalsoexhibitaudiblenoise
as a result of high voltage swings at frequencies
within the audio range. Close attention should
be given to the physical mounting of the EL
lamp to diminish this concern that can generate
both EMI and audio noise.
Electromagnetic Interference (EMI)
Considerations: ElectromagneticInterferenc
Electromagnetic Interference (EMI) concerns
are rooted in uncontrolled high voltage swings
on the EL lamp. The controlled charging and
dischanging of the EL lamp by the SP4438
minimizes EMI effects.
Printed
Circuit
Board
Layout
Suggestions: The SP4438's high voltage
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 less than 0.2 in (5mm) apart. Also keep the
connections to COIL 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 directly to the
ground plane.
EL Lamp Driver Design Challenges
Therearemanyvariableswhichcanbeoptimized
for specific applications. The amount of light
Rev.11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
© Copyright 2000 Sipex Corporation
9
EVALUATION BOARD LAYOUT (ENLARGED)
EVALUATION BOARD LAYOUT (ACTUAL SIZE)
Figure 6. Evaluation Board Layout for the SP4438.
Rev. 11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
© Copyright 2000 Sipex Corporation
10
Figure 7. Single Ended and Differential Output Waveforms for the SP4438
CH.1 and CH.2 are single ended waveform SP4438
CH.4 is differential SP4438 waveform.
Rev.11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
© Copyright 2000 Sipex Corporation
11
Supply Current vs. Lamp Size
25
20
15
10
5
0
1
1.2
1.4
1.6
1.8
2
2.2
2.4
2.6
2.8
3
Lamp Size (in2)
Figure 1
Output Voltage vs. Lamp Size
200
180
160
140
120
100
80
60
40
20
0
1
1.2
1.4
1.6
1.8
2
2.2
2.4
2.6
2.8
3
Lamp Size (in2)
Figure 2
Rev. 11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
© Copyright 2000 Sipex Corporation
12
Luminance vs.Lamp Size
30
25
20
15
10
5
8
7
6
5
4
3
2
1
0
0
1
1.5
2
2.5
3
Lamp Size (in2)
Figure 3
Lamp Frequency vs. VDD
280
275
270
265
260
255
250
2.5
2.7
2.9
3.1
3.3
3.5
3.7
VDD (volts)
Figure 4
Rev.11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
© Copyright 2000 Sipex Corporation
13
Lamp Voltage vs. VDD
180
170
160
150
140
130
120
2.5
2.7
2.9
3.1
3.3
3.5
3.7
VDD (volts)
Figure 5
27
25
23
21
19
17
15
2.5
2.7
2.9
3.1
3.3
3.5
3.7
VDD (volts)
Figure 6
Rev. 11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
© Copyright 2000 Sipex Corporation
14
Luminance vs. VDD
24
22
20
18
16
14
12
10
2.5
2.7
2.9
3.1
3.3
3.5
3.7
VDD (volts)
Figure 7
300
290
280
270
260
250
240
230
220
210
200
-40
-20
0
20
40
60
80
Temp (ºC)
Figure 8
Rev.11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
© Copyright 2000 Sipex Corporation
15
Peak Lamp Voltage vs. Temp
160
155
150
145
140
135
130
125
120
-40
-20
0
20
40
60
80
Temp (ºC)
Figure 9
IDD (total part current) vs. Temp
25
24
23
22
21
20
19
18
17
16
15
-40
-20
0
20
40
60
80
Temp (ºC)
Figure 10
Rev. 11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
© Copyright 2000 Sipex Corporation
16
CoilManufacturers
Panasonic
Murata
Hitachi Metals
6550 Katella Ave
2200 Lake Park Drive, Smyrna
Georgia 30080 U.S.A.
Phone: (770) 436-1300
Fax: (770) 436-3030
Material Trading Division
2101 S. Arlington Heights Road,
Suite 116
Cypress, CA 90630-5102
Phone: (714) 373-7366
Fax: (714) 373-7323
Arlington Heights, IL 60005-4142
Phone: 1-800-777-8343 Ext. 12
(847) 364-7200 Ext. 12
Fax: (847) 364-7279
Sumida Electric Co., LTD.
5999, New Wilke Road,
Suite #110
Rolling Meadows, IL,60008 U.S.A. 90015
Phone: (847) 956-0666
Fax: (847) 956-0702
Murata European
Holbeinstrasse 21-23, 90441
Numberg, Postfachanschrift
Hitachi Metals Ltd. Europe
Immernannstrasse 14-16, 40210
Dusseldorf, Germany
Contact: Gary Loos
Phone: 49-211-16009-0
Fax: 49-211-16009-29
Phone: 011-4991166870
Fax: 011-49116687225
Sumida Electric Co., LTD.
4-8, Kanamachi 2-Chrome,
Murata Taiwan Electronics
225 Chung-Chin Road, Taichung,
Katsushika-ku, Tokyo 125 Japan Taiwan, R.O.C.
Phone: 03-3607-5111
Fax: 03-3607-5144
Phone: 011 88642914151
Fax: 011 88644252929
Hitachi Metals Ltd.
Kishimoto Bldg. 2-1, Marunouchi
2-chome, Chiyoda-Ku, Tokyo, Japan
Contact: Mr. Noboru Abe
Phone: 3-3284-4936
Sumida Electric Co., LTD.
Block 15, 996, Bendemeer Road
#04-05 to 06, Singapore 339944
Republic of Singapore
Phone: 2963388
Murata Electronics Singapore
200 Yishun Ave. 7, Singapore
2776, Republic of Singapore
Phone: 011 657584233
Fax: 3-3287-1945
Fax: 011 657536181
Hitachi Metals Ltd. Singapore
78 Shenton Way #12-01,
Singapore 079120
Contact: Mr. Stan Kaiko
Phone: 222-8077
Fax: 222-5232
Fax: 2963390
Murata Hong Kong
Sumida Electric Co., LTD.
14 Floor, Eastern Center, 1065
King's Road, Quarry Bay,
Hong Kong
Phone: 28806688
Fax: 25659600
Room 709-712 Miramar Tower, 1
Kimberly Road, Tsimshatsui,
Kowloon, Hong Kong
Phone: 011-85223763898
Fax: 011-85223755655
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
Polarizers/transflector Mnfg.
ELLampmanufacturers
NEC Corporation
Yumi Saskai
7-1, Shiba 5 Chome, Minato-ku,
Tokyo 108-01, Japan
Phone: (03) 3798-9572
Fax: (03) 3798-6134
Nitto Denko
Yoshi Shinozuka
Bayside Business Park 48500
Fremont, CA. 94538
Phone: 510 445 5400
Fax: 510 445-5480
Leading Edge Ind. Inc.
11578 Encore Circle
Minnetonka, MN 55343
Phone 1-800-845-6992
Seiko Precision
Shuzo Abe
1-1, Taihei 4-Chome,
Sumida-ku, Tokyo, 139 Japan
Phone: (03) 5610-7089
Fax: (03) 5610-7177
Midori Mark Ltd.
1-5 Komagata 2-Chome
Taita-Ku 111-0043 Japan
Phone: 81-03-3848-2011
Top Polarizer- NPF F1205DU
Bottom - NPF F4225
or (F4205) P3 w/transflector
Luminescent Systems inc. (LSI)
101 Etna Road
Lebanon, NH. 03766-9004
Phone: (603) 448-3444
Fax: (603) 448-3452
Transflector Material
Astra Products
Mark Bogin
Gunze Electronics
2113 Wells Branch Parkway
Austin, TX 78728
P.O. Box 479
Phone: (512) 752-1299
Baldwin, NJ 11510
Phone (516)-223-7500
Fax (516)-868-2371
Rev.11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
© Copyright 2000 Sipex Corporation
17
All package dimensions in inches
0.0256
BSC
12.0˚
±4˚
0.012
±0.003
0.008
0˚ - 6˚
0.006
±0.006
0.006
±0.006
0.0965
±0.003
R .003
0.118
±0.004
0.16
±0.003
3.0˚
±3˚
12.0˚
±4˚
0.0215
1
±0.006
0.020
0.020
0.037
Ref
1
2
0.116
±0.004
0.034
±0.004
0.116
±0.004
0.040
±0.003
0.013
±0.005
0.118
±0.004
0.004
±0.002
0.118
±0.004
Rev. 11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
© Copyright 2000 Sipex Corporation
18
ORDERING INFORMATION
Operating Temperature Range
Model
Package Type
SP4438EU .............................................. -40˚C to +85˚C ..........................................8-Pin MSOP
SP4438UEB ........................................................................................................ Evaluation Board
Co rp o ra tio n
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
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 hereing; neither does it convey any license under its patent rights nor the rights of others.
Rev.11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
© Copyright 2000 Sipex Corporation
19
相关型号：
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