MIC4823MS [MICROCHIP]
EL DISPLAY DRIVER, PDSO8;
| 型号： | MIC4823MS |
| 厂家： | 
MICROCHIP |
| 描述： | EL DISPLAY DRIVER, PDSO8 驱动 光电二极管 接口集成电路 |
| 文件： | 总8页 (文件大小：100K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC4823
High Voltage EL Lamp Driver
Advance Information
General Description
Features
The MIC4823 is a high-voltage driver designed for driving EL
lamps of up to 50nF (typically 16 square inches). EL lamps
greater tan 50nF can bedriven for applicatinons not requiring
high brightness. The input supply voltage range is from 2.0V
to 9.5V. The device uses a single inductor and a minimum
number of passive components. The nominal regulated out-
put voltage that is applied to the EL lamp is ±90V. The chip
• Processed with high voltage CMOS technology
• 2.0V to 9.5V operating supply voltage
• DC to AC conversion
• 180V peak-to-peak typical output voltage
• Large output load capability typically 50nF
• Permits the use of high-resistance elastometric lamp
connectors
canbeenabledbyconnectingtheresistoronR
and disabled by connecting them to ground.
toV
• Adjustable output lamp frequency to control lamp color,
lamp life, and power consumption
SW-OSC
DD
• Adjustable converter frequency to eliminate harmonics
and optimize power consumption
• Enable/disable function
The MIC4823 has two internal oscillator, a switching MOS-
FET, andahighvoltageELlampdriver. Thefrequencyforthe
switching MOSFET is set by an external resistor connected
• Low current draw under no load condition
between the R
pin and the V
pin. An external
SW-OSC
DD
inductor is connected between L and V pins. A 0.01µF to
Applications
• Handheld personal computers
• Electronic personal organizers
• Cellular Phones
• Pagers
• Portable instrumentation
• GPS units
X
DD
0.1µF capacitor is connected between the C pin and GND.
S
The EL lamp is conected between V and V .
A
B
The switching MOSFET charges the external inductor and
discharges it into the capacitor at C . The voltage at C will
S
S
start to increase. Once the voltage at C reaches a nominal
S
value of 90V, the switching MOSFET is turned OFF to
conserve power. The outputs V and V are configured as an
A
B
Ordering Information
H-bridge and are switcng in oppisite states to achieve 180V
peak-to-peak across the EL lamp.
Part Number
MIC4823MS
MIC4823M
Junction Temp. Range*
–25°C to +85°C
Package
8-lead MSOP
8-lead SOP
–25°C to +85°C
Typical Application
Ω
Ω
Ω
0.1•F
µ
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
July 2000
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MIC4823
MIC4823
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Pin Configuration
1
2
3
4
8
7
6
5
V
V
V
A
DD
B
R
SW-osc
MIC 4826
R
EL-osc
C
S
GND
L
X
8-Lead SOP
8-Lead MSOP
Pin Description
Pin Number
Pin Name
VDD
Pin Function
1
2
3
4
5
6
7
8
Power supply input voltage
RSW-OSC
REL-OSC
GND
LX
Input for setting switched converter frequency
Input for setting EL lamp driver frequency
IC Ground
Open drain input of switched converter FET
Regulated output of the witched converter
Output to EL lamp, polarity is not important
Output to EL lamp, polarity is not important
CS
VB
VA
MIC4823
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Absolute Maximum Ratings (Note 1)
Operating Ratings (Note 2)
Supply Voltage (V ) .................................... –0.5V to 4.5V
Operating Temperature Range
DD
MIC4823M................................................ –25°C to 85°C
MIC4823MS ............................................. –25°C to 85°C
Output Voltage (V ) ..................................... 0.5V to 120V
CS
Lead Temperature (soldering, 10 sec.) ..................... 300°C
Power Dissipation
Storage Temperature (T ) ..............................–65° to 85°C
S
MIC4823M...........................................................400mW
MIC4823MS ........................................................250mW
Electrical Characteristics
VIN = 3.0; RSW = 750kΩ; REL = 2.0MΩ; TA = 25°C, bold values indicate –40°C ≤ TA ≤ +85°C; unless noted
Parameter
Condition
Min
Typ
Max
Units
On-resistance of switching
transistor
I = 100mA
7.0
Ω
Output voltage regulation, VCS
VDD = 1.8V to 3.5V
VDD = 1.8V to 3.5V
75
80
85
V
V
Output peak-to-peak voltage
VA - VB
150
160
170
Quiescent VDD supply current,
disabled, IDDQ
RSW-OSC = Low
100
150
45
nA
µA
Input current going into the VDD
pin, IDD
VDD = 1.8V to 3.5V, (Figure 1.)
VIN = 1.5V, (Figure 2.)
Input current including inductor
current, IIN
35
mA
Output Voltage on VCS
VIN = 1.5V, (Figure 2.)
VIN = 1.5V, (Figure 2.)
65
70
375
80
V
Hz
kHz
%
VA-B output drive frequency, fEL
300
450
Switching transistor frequency, fSW VIN = 1.5V, (Figure 2.)
Switching transistor duty cycle, D
88
Note 1. Exceeding the absolute maximum rating may damage the device.
Note 2. The device is not guaranteed to function outside its operating rating.
Note 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
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Functional Diagram
MIC4823
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Applications Information
Split Supply Configuration
The MIC4823 can also be used for handheld devices operat-
ing froma single cell 1.5V battery where a regulated voltage
is available. This is shown in Figure 2. The regulated voltage
can be used to run the internal logic of the MIC4823. The
amount of current necessary to run the internal logic is
typically150µAatV between1.8Vand3.5V. therefore, the
DD
regulated voltage could easily provide the current without
being loaded down
The MIC4823 used in this configuration can also be enabled/
disabled via logic control signal on the R and R resistors
SW
EL
as shown if Figure 2.
Figure 2 can also be used with high battery voltages such as
12 as long as the input voltage, V , to the MIC4823 device
DD
is within its specifications of 1.8V to 3.5V.
ON = VIN
OFF = 0V
REL
VDD
RSW
L
R
R
EL-osc
V
SW-osc
X
DD
EL Lamp
C
S
V
V
A
L
x
1N4148
ETC 4826
B
CS
100V
VIN
GND
4.7•F
Operating VDD Voltage: 1.8V to 3.5V
EL lamp Size: Up to 2.5 in2
Brightness: 3.0 to 5.0 ft-lm
Figure 2. Split Supply Configuration
VIN
IIN
VCS
fEL
LX
CS
RSW
REL
1M
Lamp Size Brightness
1.6in2
5ft-lm
1.5V 35mA 66V 345Hz 220µA 0.1µF 560k
Typical Performance
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MIC4823
MIC4823
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Package Information
8-Lead MSOP (MS)
8-Lead SOP (M)
MIC4823
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MIC4823
Micrel
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MIC4823
MIC4823
Micrel
MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL + 1 (408) 944-0800 FAX + 1 (408) 944-0970 WEB http://www.micrel.com
This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or
other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc.
© 2000 Micrel Incorporated
MIC4823
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July 2000
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