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
cm
2
in size. It is a high-efficiency driver that features revised 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
s
s
s
PINOUT
(Top view)
s
s
s
s
s
Dedicated EL driver
1.6 to 5.5 V supply voltage
150mA maximum operating current
(V
DD
= 3.0V, Ta
≤
70
°
C)
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
N.C.
CHV
N.C.
LDR
N.C.
VSS
N.C.
OCL
1
16
N.C.
OUT1
N.C.
OUT2
N.C.
VDD
ENA
8143AV
*: Adjustable with external resistance.
APPLICATIONS
s
s
s
8
9
OCE
Hand held PC, Palm size PC
Mobile IT equipment
White EL
PACKAGE DIMENSIONS
(Unit : mm)
ORDERING INFORMATION
D e vice
SM8143AV
P ackag e
16-pin V S O P
4.4 0.2
6.4 0.2
0.275TYP
5.1 0.2
0.15
-
+ 0.1 5
0.0
0 10
0.10
+ 0.10
0.22
- 0.05
0.10 0.05
1.15 0.1
0.65
0.12
M
0.5 0.2
NIPPON PRECISION CIRCUITS—1
SM8143A
BLOCK DIAGRAM
EL sheet
<
80cm
2
VDD
LDR
CHV
OUT1
OUT2
Switching Circuit
Boosting Block
Dividing Circuit
1/4
Dividing Circuit
1/1024
Oscillator for
Boosting
VSS
ENA
OCL
Oscillator for
EL driving
OCE
Oscillation Block
R
OCL
R
OCE
ENA from microcontroller
When ENA is logical "H", SM8143A is active.
Note: Brightness and operating current are adjusted with R
O C L
.
EL driving frequency is adjusted with R
O C E
.
PIN DESCRIPTION
Pin nu m b e r
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Name
N . C.
CHV
N . C.
LDR
N . C.
VSS
N . C.
OCL
OCE
ENA
VDD
N . C.
OUT2
N . C.
OUT1
N . C.
I/O
–
I
–
O
–
–
–
I
I
I
–
–
O
–
O
–
No connection (must be open)
High-voltage DC input
No connection (must be open)
Booster coil driver output
No connection (must be open)
Ground
No connection (must be open)
Coil driver oscillator (oscillator frequency determined by external resistor)
EL driver oscillator (oscillator frequency determined by external resistor)
E n a ble input (built-in pull-down resistor)
Supply
No connection (must be open)
Output 2
No connection (must be open)
Output 1
No connection (must be open)
Function
NIPPON PRECISION CIRCUITS—2
SM8143A
SPECIFICATIONS
Absolute Maximum Ratings
P arameter
Supply voltage range
Input voltage range
Symbol
V
DD
V
IN
V
CHV
Output voltage
V
LDR
V
OUT1/2
Pow er dissipation
Storage temperature range
P
D
T
STG
All Input pins
CHV pin
LDR pin
OUT1, OUT2 pin
T
a
≤
70
°
C
T
a
≤
85
°
C
Condition
Rating
−
0.3 to 7.0
V
S S
−
0.3 to V
D D
+ 0.3
0.5 to 120
0.5 to 120
0.5 to 120
200
140
−
55 to 125
Unit
V
V
V
V
V
mW
mW
°
C
Recommended Operating Conditions
Rating
P arameter
Supply voltage range
Operating temperature
Symbol
V
DD2
T
O P R
Including coil current, V
D D
=
3.0V, T
a
≤
70
°
C
Operating current
1
I
D D 2
Including coil current, V
D D
=
5.0V, T
a
≤
70
°
C
Including coil current, V
D D
=
3.0V, T
a
≤
85
°
C
Including coil current, V
D D
=
5.0V, T
a
≤
85
°
C
Coil inductance
L
LDR
f
L D R
= 64 kHz
Condition
min
1.6
−
40
–
–
–
–
–
typ
3.0
–
–
–
–
–
0.47
max
5.5
85
150
100
105
70
–
V
°
C
mA
mA
mA
mA
mH
Unit
1. Max value is as same as Absolute Maximum Ratings.
NIPPON PRECISION CIRCUITS—3
SM8143A
DC Characteristics
V
DD
= 3.0 V, T
a
= 25
°
C unless otherwise noted.
Rating
P arameter
Supply voltage
CHV output voltage
OUT1, OUT2 HIGH-level output voltage
O U T 1 , O U T 2 L OW -level output voltage
LDR output resistance
OCE oscillator frequency
OCE oscillator frequency range
OCL oscillator frequency
OCL oscillator frequency range
OUT1, OUT2 output frequency
OUT1, OUT2 output frequency range
LDR inductance driver frequency
LDR inductance driver frequency range
ENA HIGH-level input voltage
E N A L OW -level input voltage
ENA input current
ENA r ise time
1
Operating current
Stand-by current
1.
Symbol
V
DD
V
CHV
V
OUTH
V
OUTL
R
LDR
f
O C E 1
f
O C E 2
f
O C L 1
f
O C L 2
f
O U T 1
f
O U T 2
f
L D R 1
f
L D R 2
V
ENAH
V
ENAL
I
E N A H
t
E N A
I
D D 1
I
S T B
Excluding coil current
E N A = L OW
ENA = HIGH, V
D D
= 1.6 to 5.5V
E N A = L OW , V
D D
= 1.6 to 5.5V
V
E N A H
= V
D D
= 3.0V
R
O C L
= 180 k
Ω
R
O C E
= 180 k
Ω
R
O C L
= 180 k
Ω
I
L D R
= 50 mA
R
O C E
= 180 k
Ω
Condition
min
1.6
0.5
–
–
–
205
32
205
32
200
31
51
8
V
D D
– 0.5
V
S S
– 0.3
2.0
–
–
–
typ
3.0
–
–
–
3.5
256
–
256
–
250
–
64
–
–
–
4.0
–
–
–
max
5.5
100
100
0.5
5.25
307
kHz
1536
307
kHz
1536
300
Hz
1500
77
kHz
384
V
D D
+ 0.3
V
S S
+ 0.5
6.0
100
1.0
1.0
µ
A
µ
s
mA
µ
A
V
V
V
V
V
Ω
Unit
ENA
V
SS
V
DD
−
0.5
V
SS
+ 0.5
V
DD
t
ENA
NIPPON PRECISION CIRCUITS—4
SM8143A
TYPICAL APPLICATIONS
s
EL sheet size: 20 to 30cm
2
, Current consumption: 20mA
0.1µF
100V
N.C.
CHV
N.C.
LDR
N.C.
OUT1
N.C.
OUT2
N.C.
VDD
ENA
OCE
EL sheet
0.01µF
470µH
N.C.
VSS
N.C.
OCL
3.0V
180kΩ
Diode: TOSHIBA 1SS250
Coil: MURATA LQH4N471K04M00
180kΩ
s
EL sheet size: 30 to 50cm
2
, Current consumption: 40mA
0.1µF
100V
N.C.
CHV
N.C.
LDR
N.C.
OUT1
N.C.
OUT2
N.C.
VDD
ENA
OCE
EL sheet
0.01µF
470µH
N.C.
VSS
N.C.
OCL
3.0V
360kΩ
Diode: TOSHIBA 1SS250
Coil: MURATA LQH4N471K04M00
180kΩ
s
EL sheet size: 50 to 100cm
2
, Current consumption: 80mA
0.1µF
100V
N.C.
CHV
N.C.
LDR
N.C.
OUT1
N.C.
OUT2
N.C.
VDD
ENA
OCE
EL sheet
0.01µF
330µH
N.C.
VSS
N.C.
OCL
3.0V
510kΩ
Diode: TOSHIBA 1SS250
Coil: TOKO D73LC (817CE331M)
180kΩ
Note: Do not operate the S M 8 1 4 3 A with the EL sheet NOT connected (no load to OUT1/OUT2) since the IC will be damaged.
NIPPON PRECISION CIRCUITS—5
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