sp4403 Exar Corporation, sp4403 Datasheet

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sp4403

Manufacturer Part Number
sp4403
Description
Low Voltage Electroluminescent Lamp Driver
Manufacturer
Exar Corporation
Datasheet

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sp4403EM
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HN
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sp4403EU
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APPLICATIONS
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 SOIC packages.
SP4403DS/05
ELEN
COIL
+2.2V to +4.5V Battery Operation
DC-to-AC Converter Produces Up To
Single Resistor Controlled Internal Oscillator
Low Current Standby Mode
Features
Pagers
Cellular Phones
PDAs
220V
• High Efficiency Super Driver Architecture
• Uses Small 470 H Coil
Low Voltage Electroluminescent Lamp Driver
EL1
V
SS
PP
for EL Display Panels
1
2
3
4
SP4403
®
8
7
6
5
SP4403 Electroluminescent Lamp Driver
R
C
V
EL2
OSC
INT
DD
1
0.1 F
C1
V
BATT
450k
ELEN
R
OSC
10nF
C2
R
V
OSC
DD
EL Lamp
1
6
8
2
V
SS
SP4403
© Copyright 2000 Sipex Corporation
EL1
4
5
EL2
SP4403
7
3
COIL
C
INT
*
optional device
1800pF
1N4148
470 H
C
L1
D1
INT
*
*

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sp4403 Summary of contents

Page 1

... 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 ...

Page 2

... SP4403 Electroluminescent Lamp Driver 2 = 10nF unless otherwise noted ...

Page 3

... COIL (pin 3) to this input pin increases the light output of the EL lamp. to this BATT Pin 8 — R — Oscillator Resistor. Connecting OSC a 450k resistor to this input pin sets the frequency of the internal clock. SP4403 Electroluminescent Lamp Driver 3 < +4.5V. DD — Integrator Capacitor. © Copyright 2000 Sipex Corporation ...

Page 4

... DESCRIPTION The SP4403 contains a DC-AC inverter that can produce an AC output of 180V +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 ...

Page 5

... OSC 450k R OSC 0.1 F 10nF EL Lamp Figure 2. Typical Application Circuit for the SP4403, Set for a Square Wave Output with =1/2LI where the product I P where t is the time it takes for the coil to reach ON its peak current, V the internal NPN switch transistor, and L is the inductance of the coil ...

Page 6

... 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 ...

Page 7

... 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 SP4403 Electroluminescent Lamp Driver 7 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 ...

Page 8

... Figure 5. EL Voltage Waveforms from the EL1 and EL2 Outputs Differential Representation Figure 6. EL Differential Output Waveform of the EL1 and EL2 Outputs SP4403DS/05 V =80V (typical) PEAK EL1 Output EL2 Output SP4403 Electroluminescent Lamp Driver 8 EL1 Output EL2 Output V =160V PP (typical) © Copyright 2000 Sipex Corporation ...

Page 9

... Absolute measurements may vary depending upon the brand of components chosen. OSCL1: FREQUENCY VS. RESISTANCE, 600 500 400 300 200 100 0 49.9 102.0 200.0 Figure 7. Oscillator Frequency OSC SP4403: SUPPLY CURRENT VS. Rosc, VDD=3.0V, L=470uH (4.9OHMS 200 301 Figure =3.0V, Coil=470 H, 4.9 TOTAL ...

Page 10

... SP4403: OUTPUT VOLTAGE VS. Rosc, VDD=3.0V, L=470uH (4.9 OHMS), 250.0 200.0 150.0 100.0 50.0 0.0 200 301 Figure 9. Output Voltage =3.0V, Coil=470 H, 4.9 OSC DD SP4403: OUTPUT VOLTAGE VS. LAMP SIZE, VDD=3V, L=470uH 200.0 180.0 160.0 140.0 120.0 100.0 80.0 60.0 40.0 20.0 0.0 1.5 2.0 Figure 10. Output Voltage vs Lamp Size, V SP4403DS/05 402 511 604 Rosc ( ...

Page 11

... SP4403: BRIGHTNESS VS. Rosc, VDD=3.0V, L=470uH (4.9 OHMS 200 301 Figure 11. Luminance =3.0V, Coil=470 H, 4.9 OSC DD SP4403: BRIGHTNESS VS. LAMP SIZE, VDD=3V, L=470uH 8.00 7.00 6.00 5.00 4.00 3.00 2.00 1.00 0.00 1.5 2.0 Figure 12. Luminance vs Lamp Size SP4403DS/05 402 511 604 Rosc (K ) 2.5 3.0 3.5 LAMP SIZE (SQ-IN) =3.0V, R =450k , Coil=470 H, 4.9 OSC SP4403 Electroluminescent Lamp Driver ...

Page 12

... SP4403: SUPPLY CURRENT VS. LAMP SIZE, VDD=3V, L=470uH 1.5 2.0 Figure 13 Lamp Size, V =3.0V, R TOTAL DD SP4403DS/05 2.5 3.0 3.5 LAMP SIZE (SQ-IN) =450k , Coil=470 H, 4.9 OSC SP4403 Electroluminescent Lamp Driver 12 4.0 5.0 © Copyright 2000 Sipex Corporation ...

Page 13

... SOIC devices per tube std qty per reel 2500 SP4403 Electroluminescent Lamp Driver 13 3.0˚ 3˚ max qty per reel 3000 © Copyright 2000 Sipex Corporation ...

Page 14

... Model SP4403EU . ............................................ -40˚C to +85˚C ......................................... 8-Pin SOIC SP4403UEB ........................................................................................................ 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 ...

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