SM8143A
NIPPON PRECISION CIRCUITS INC.
EL Sheet Driver
OVERVIEW
The SM8143A is a transformer-less electroluminescent (EL) driver IC, capable of driving displays up to 80
2
cm
in size. It is a high-efficiency driv er that features re vised coil switching transistor ON resistance and output
circuit configuration to reduce loss.
The EL drive frequency and coil drive frequency can be controlled independently, making the driver circuit
optimizable to match application requirements. A microcontroller interface pin (ENA) is provided, which can
be used to control the EL driver ON/OFF function. The device is available in 16-pin VSOP packages.
FEATURES
■
Dedicated EL driver
■
1.6 to 5.5 V supply voltage
■
150mA maximum operating current
(V
= 3.0V, Ta ≤ 70 ° C)
DD
■
3.5 Ω typical output resistance
■
200 Vp-p maximum EL driver voltage*
■
31 to 1500 Hz EL drive frequency range*
■
High voltage CMOS Process
■
16-pin VSOP plastic package
*: Adjustable with external resistance.
APPLICATIONS
■
Hand held PC, Palm size PC
■
Mobile IT equipment
■
White EL
PINOUT
(Top view)
N.C.
CHV
N.C.
1
16
8143AV
LDR
N.C.
VSS
N.C.
8
OCL OCE
9
PACKAGE DIMENSIONS
(Unit : mm)
N.C.
OUT1
N.C.
OUT2
N.C.
VDD
ENA
ORDERING INFORMATION
De vice Pack ag e
SM8143AV 16-pin VSOP
0.65
0.275TYP
5.1 0.2
4.4 0.2
6.4 0.2
0.10
+ 0.10
0.22
- 0.05
M
0.12
0.10 0.05
NIPPON PRECISION CIRCUITS—1
1.15 0.1
0.5 0.2
0.15
+ 0.1
- 0.05
010
BLOCK DIAGRAM
SM8143A
EL sheet
<
80cm
VDD CHVLDR OUT2OUT1
2
Boosting Block
Switching Circuit
VSS
ENA
Dividing Circuit
1/4
Oscillator for
Boosting
OCL
Dividing Circuit
1/1024
Oscillator for
EL driving
OCE
Oscillation Block
R
OCL ROCE
ENA from microcontroller
When ENA is logical "H", SM8143A is active.
Note: Brightness and operating current are adjusted with R
EL dr iving frequency is adjusted with R
OCE
PIN DESCRIPTION
Pin number Name I / O Function
1 N.C . – No connection (must be open)
2 C H V I High-voltage DC input
3 N.C . – No connection (must be open)
4 LD R O Booster coil driver output
5 N.C . – No connection (must be open)
6 VS S – Ground
7 N.C . – No connection (must be open)
8 OC L I Coil driver oscillator (oscillator frequency determined by external resistor)
9 O CE I E L d river oscillator (oscillator frequency determined by external resistor)
10 ENA I Enable input (built-in pull-down resistor)
11 V DD – Supply
12 N.C . – No connection (must be open)
13 OUT2 O Output 2
14 N.C . – No connection (must be open)
15 OUT1 O Output 1
16 N.C . – No connection (must be open)
OCL
.
NIPPON PRECISION CIRCUITS—2