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PDF MIC4827BMM Data sheet ( Hoja de datos )
| Número de pieza | MIC4827BMM | |
| Descripción | Low Input Voltage/ 180VPP Output Voltage/ EL Driver | |
| Fabricantes | Micrel Semiconductor | |
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MIC4827
Micrel
MIC4827
Low Input Voltage, 180VPP Output Voltage, EL Driver
Final Information
General Description
Micrel’s MIC4827 is a high output voltage, DC to AC con-
verter, designed for driving EL (Electroluminescent) lamps.
The device operates from an input voltage range of 1.8V to
5.5V, making it suitable for 1-cell Li Ion and 2- or 3-cell
alkaline/NiCad/NiMH battery applications. The MIC4827 con-
verts a low voltage DC input to a 180VPP AC output signal that
drives the EL lamp.
The MIC4827 is comprised of two stages: a boost stage, and
an H-bridge, lamp driver, stage. The boost stage steps the
input voltage up to +90V. The H-bridge stage then alternately
switches the +90V output to each terminal of the EL lamp,
thus creating a 180VPP AC signal to drive the EL lamp and
generate light.
The MIC4827 features separate oscillators for the boost- and
H-bridge stages. External resistors independently set the
operating frequency of each stage. This flexibility allows the
EL lamp circuit to be optimized for maximum efficiency and
brightness.
The MIC4827 uses a single inductor and a minimum number
of external components, making it ideal for portable, space-
sensitive applications.
The MIC4827 is available in an 8-pin MSOP package with an
ambient temperature range of –40°C to +85°C.
Features
• 1.8V to 5.5V DC input voltage
• 180VPP regulated AC output waveform
• Independently adjustable EL lamp frequency
• Independently adjustable boost converter frequency
• 0.1µA shutdown current
Applications
• LCD panel backlight
• Cellular phones
• PDAs
• Pagers
• Calculators
• Remote controls
• Portable phones
Ordering Information
Part Number
MIC4827BMM
Ambient Temp. Range
–40°C to +85°C
Package
MSOP-8
Typical Application
L1
VIN 220µH
D1
1N4148
CIN
10µF
MIC4827
1 VDD
332k
2
RSW
3.32M
3
REL
4
GND
SW 5
6
CS
8
VA
7
VB
COUT
0.033µF/100V
2in2 EL LAMP
High Voltage EL Driver
TIME (2ms/div)
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
September 2001
1
MIC4827
1 page  
MIC4827
EL Frequency
vs. Temperature
400
350
RSW =1M
300
250
200 RSW = 2M
150
100
50 RSW = 3.32M
VIN = 3.0V
0
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
200
180
160
140
120
100
80
60
40
20
0
0
Output Voltage
vs. Lamp Size
RSW = 332k
REL = 3.32M
VIN = 3.0V
L = 220µH
COUT = 0.1µF
D = BAV20WS
1234567
LAMP SIZE (sq. in.)
Micrel
Total Input Current
vs. Lamp Size
30
25 RSW = 332k
20 REL = 3.32M
15
10 VIN = 3.0V
L = 220µH
5 COUT = 0.1µF
D = BAV20WS
0
01234567
LAMP SIZE (sq. in.)
September 2001
5
MIC4827
5 Page 
MIC4827
VIN
1.5V
L1
220µH
Murata
LQH4C221K04
D1
Diodes
BAS20W
C2
10µF/6.3V
Murata
GRM42-6X5R106K6.3
MIC4827
1 VDD
SW 5
VDD
1.8V to 5.5V
C1
0.01µF/50V
Murata
GRM42-6X5R106K6.3
R1 2
RSW
562k
3
R2
3.32M
REL
4
GND
6
CS
8
VA
7
VB
COUT
0.01µF/100V
GRM42-2X7R104K100
EL LAMP
VIN
1.5V
IIN
26mA
VDD
3.0V
IDD
32µA
VA–VB
180VPP
FEL
104Hz
Lamp Size
1.6in2
Micrel
TIME (2ms/div)
Figure 8. Typical Split Power Supplies Applications
September 2001
11
MIC4827
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MIC4827BMM.PDF ] | |
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