SM8142B
EL Driver
OVERVIEW
The SM8142B is a transformer-less electroluminescent (EL) driver IC, capable of driving sheets up to 30cm
2
in size.
It employs a high-efficiency driver output circuit configuration to control power dissipation. It is available in
ultra-small 8-pin SON (Small Outline Non-leaded) packages
*
, making possible the construction of small, thin,
low-power driver units.
* : SM8142BD
FEATURES
▪
Dedicated EL driver
▪
Noise-less smooth drive waveform
▪
High-efficiency output circuit
▪
Stand-by function
▪
Stable temperature characteristics
▪
Ultra-small package
▪
1.6 to 5.5V supply voltage
▪
0.3mA typ. (V
DD
=3.0V) current consumption
(excluding coil current)
▪
200V
P-P
maximum EL driver voltage
▪
31 to 1000Hz EL driver frequency range
▪
220µH minimum coil inductance
PACKAGE DIMENSIONS (Unit : mm)
▪
8-pin SON
ORDERING INFORMATION
Device
SM8142BD
SM8142BV
Package
8 pin SON
8 pin VSOP
▪
8-pin VSOP
SEIKO NPC CORPORATION -
1
SM8142B
PINOUT (Top view)
▪
8-pin SON
BLOCK DIAGRAM
EL sheet
VSS
OSC
1
2
8 LDR
7 CHV
6 OUT1
5 OUT2
Dividing Circuit
Dividing Circuit
VDD
LDR
CHV
OUT1
OUT2
ENA 3
VDD 4
▪
8-pin VSOP
High Voltage
Switching Circuit
CHV 1
LDR
VSS
OSC
2
3
4
8
7
6
5
OUT1
OUT2
VDD
ENA
VSS
Oscillator for
Boosting Voltage and EL Driving
OSC
ENA
PIN DESCRIPTION
Pin number
VSOP-8
1
2
3
4
5
6
7
8
SON-8
7
8
1
2
3
4
5
6
CHV
LDR
VSS
OSC
ENA
*1
VDD
OUT2
OUT1
I
O
-
I
I
-
O
O
High-voltage DC input
Booster coil driver output
Ground
Coil and EL driver oscillator
(oscillator frequency determined by external resistor)
Enable input (High : enable, Low : disable)
Supply
Output 2
Output 1
Name
I/O
Function
*1. Built-in pull-down resistor
SEIKO NPC CORPORATION - 2
SM8142B
SPECIFICATIONS
Absolute Maximum Ratings
Parameter
Supply voltage range
Input voltage range
Output voltage(CHV)
Output voltage(LDR)
Output voltage(OUT1/2)
Power dissipation
Storage temperature range
Symbol
V
DD
V
IN
V
CHV
V
LDR
V
OUT1/2
P
D
T
STG
All input pins
CHV pin
LDR pin
OUT1,OUT2 pin
Ta85℃
Condition
Rating
-0.3 to 7.0
V
SS
-0.3 to V
DD
+0.3
0.5 to 120
0.5 to 120
0.5 to 120
100
-55 to +125
Unit
V
V
V
V
V
mW
°C
Note. The device may be damaged or deteriorated if any of the above parameter ratings is exceeded.
Recommended Operating Conditions
Parameter
Supply voltage range
Operating temperature
Operating current
Symbol
V
DD2
T
OPR
I
DD2
R
CHV
Current limit resistance
R
OUT
V
DD
>4.0V
Coil inductance
L
LDR
f
LDR
=64kHz
Including coil current, V
DD
=3.0V
Including coil current, V
DD
=5.0V
V
DD
4.0V
V
DD
>4.0V
V
DD
4.0V
EL Size
30cm
2
EL Size >30cm
2
EL Size
30cm
2
EL Size >30cm
2
Condition
Rating
MIN
1.6
-40
-
-
0
20
0
1.0
0
1.0
*2
-
TYP
3.0
-
-
-
-
-
-
-
-
-
470
MAX
5.5
85
60
*1
36
*1
-
-
-
-
1.0
1.0
*2
-
kΩ
Unit
V
℃
mA
kΩ
µH
*1. When it is designed, these ratings should not be exceeded, including device variations.
*2. These values should be fixed at 1.0kΩ.
SEIKO NPC CORPORATION - 3
SM8142B
DC Characteristics
V
DD
=3.0V, Ta=25°C unless otherwise noted.
Parameter
Supply voltage
Output voltage
Output resistance
Oscillator frequency
Oscillator frequency range
Output frequency
*1
Pin
VDD
CHV
OUT1/2
OUT1/2
LDR
OSC
OUT1/2
LDR
Symbol
V
DD
V
CHV
V
OUTH
V
OUTL
R
LDR
f
OSC1
f
OSC2
f
OUT1
f
OUT2
f
LDR1
f
LDR2
V
ENAH
Condition
Rating
MIN
1.6
0.5
-
-
-
205
32
200
31
51
8
V
DD
-0.5
V
SS
-0.3
TYP
3.0
-
-
-
8.0
256
-
250
-
64
-
-
-
MAX
5.5
100
100
0.5
12.0
307
1024
300
1000
77
256
V
DD
+0.3
V
SS
+0.5
Unit
V
V
V
V
Ω
kHz
kHz
Hz
Hz
kHz
kHz
V
V
µA
ms
mA
µA
I
LDR
=50mA
R
OSC
=180k
R
OSC
=180k
R
OSC
=180k
ENA=”H”
V
DD
=1.6 to 5.5V
ENA=”L”
V
DD
=1.6 to 5.5V
V
ENAH
=V
DD
=3.0V
V
ENAL
→V
ENAH
Excluding coil current
ENA=”L”
Output frequency range
Inductance driver frequency
*1
Inductance driver frequency range
HIGH-level input voltage
ENA
LOW-level input voltage
Input current
Rise time
*2
Operating current
Stand-by current
ENA
ENA
VDD
VDD
V
ENAL
I
ENAH
t
ENA
I
DD1
I
STB
2.0
-
-
-
4.0
-
-
-
6.0
100
0.5
1.0
*1. Output frequency=(1/256)×Inductance driver frequency
*2. Rise time
V
DD
-0.5V
ENA
V
SS
+0.5V
t
ENA
SEIKO NPC CORPORATION - 4
SM8142B
TYPICAL APPLICATIONS
(1) EL sheet size : 20 to 30cm
2
Current consumption : 20mA
470μH
Cbypass
0.01μF
VSS
180kΩ
LDR
CHV
OUT1
OUT2
EL sheet
*1
0.1μF
100V
OSC
ENA
VDD
3.0V
Diode:TOSHIBA 1SS403
Coil :MURATA LQH4N471K04M00
(2) EL sheet size : 30 to 50cm
2 *2
Current consumption : 40mA
220μH
Cbypass
0.01μF
VSS
180kΩ
LDR
CHV
1.0kΩ
OSC
ENA
VDD
3.0V
OUT1
OUT2
EL sheet
*1
0.1μF
100V
Diode:TOSHIBA 1SS403
Coil :MURATA LQH4N221K04M00
SEIKO NPC CORPORATION - 5
FPGA/CPLD
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