8142B_ND11013E00

SM8142B
EL Driver
OVERVIEW
The SM8142B is a transformer-less electroluminescent (EL) driver IC, capable of driving sheets up to 30cm2 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
PACKAGE DIMENSIONS (Unit : mm)
▪ 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. (VDD=3.0V) current consumption
(excluding coil current)
▪ 200VP-P maximum EL driver voltage
▪ 31 to 1000Hz EL driver frequency range
▪ 220µH minimum coil inductance
▪ 8-pin SON
ORDERING INFORMATION
Device
Package
SM8142BD
8 pin SON
SM8142BV
8 pin VSOP
▪ 8-pin VSOP
SEIKO NPC CORPORATION - 1
SM8142B
PINOUT (Top view)
BLOCK DIAGRAM
▪ 8-pin SON
EL sheet
VSS
1
8 LDR
OSC
2
7 CHV
VDD
ENA 3
6 OUT1
VDD 4
5 OUT2
LDR
CHV
OUT1
OUT2
High Voltage
Switching Circuit
▪ 8-pin VSOP
Dividing Circuit
CHV 1
8
OUT1
LDR
2
7
OUT2
VSS
3
6
VDD
OSC
4
5
ENA
Dividing Circuit
Oscillator for
Boosting Voltage and EL Driving
VSS
OSC
ENA
PIN DESCRIPTION
Pin number
Name
I/O
7
CHV
I
High-voltage DC input
2
8
LDR
O
Booster coil driver output
3
1
VSS
-
Ground
4
2
OSC
I
Coil and EL driver oscillator
(oscillator frequency determined by external resistor)
5
3
ENA*1
I
Enable input (High : enable, Low : disable)
6
4
VDD
-
Supply
7
8
5
6
OUT2
OUT1
O
O
Output 2
Output 1
VSOP-8
SON-8
1
Function
*1. Built-in pull-down resistor
SEIKO NPC CORPORATION - 2
SM8142B
SPECIFICATIONS
Absolute Maximum Ratings
Parameter
Symbol
Supply voltage range
VDD
Input voltage range
VIN
Output voltage(CHV)
Output voltage(LDR)
Output voltage(OUT1/2)
VLDR
VOUT1/2
Storage temperature range
PD
Rating
Unit
-0.3 to 7.0
V
VSS-0.3 to VDD+0.3
V
CHV pin
0.5 to 120
V
LDR pin
OUT1,OUT2 pin
0.5 to 120
0.5 to 120
V
V
100
mW
-55 to +125
°C
All input pins
VCHV
Power dissipation
Condition
Ta85℃
TSTG
Note. The device may be damaged or deteriorated if any of the above parameter ratings is exceeded.
Recommended Operating Conditions
Parameter
Symbol
Rating
Condition
MIN
TYP
MAX
Unit
Supply voltage range
VDD2
1.6
3.0
5.5
V
Operating temperature
TOPR
-40
-
85
℃
Operating current
IDD2
RCHV
Including coil current, VDD=3.0V
-
-
60
Including coil current, VDD=5.0V
0
-
36*1
-
20
-
-
0
-
-
1.0
-
-
0
-
1.0
1.0*2
-
470
1.0*2
-
VDD4.0V
VDD>4.0V
VDD4.0V
Current limit resistance
ROUT
LLDR
EL Size 30cm2
EL Size >30cm2
2
VDD>4.0V
Coil inductance
*1
fLDR=64kHz
EL Size 30cm
EL Size >30cm2
mA
kΩ
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
VDD=3.0V, Ta=25°C unless otherwise noted.
Parameter
Pin
Symbol
VDD
Condition
Rating
Unit
MIN
TYP
MAX
VDD
1.6
3.0
5.5
V
CHV
VCHV
0.5
-
100
V
Output voltage
OUT1/2
VOUTH
-
-
100
V
Output resistance
OUT1/2
LDR
VOUTL
RLDR
ILDR=50mA
-
8.0
0.5
12.0
V
Ω
fOSC1
ROSC=180k
205
256
307
kHz
32
-
1024
kHz
200
250
300
Hz
31
-
1000
Hz
51
8
64
-
77
256
kHz
kHz
Supply voltage
Oscillator frequency
OSC
Oscillator frequency range
Output frequency
*1
OUT1/2
Output frequency range
*1
Inductance driver frequency
Inductance driver frequency range
LDR
fOSC2
fOUT1
fLDR1
fLDR2
ENA=”H”
VDD=1.6 to 5.5V
VDD-0.5
-
VDD+0.3
V
VENAL
ENA=”L”
VDD=1.6 to 5.5V
VSS-0.3
-
VSS+0.5
V
ENA
IENAH
VENAH=VDD=3.0V
2.0
4.0
6.0
µA
ENA
tENA
VENAL→VENAH
-
-
100
ms
VDD
VDD
IDD1
ISTB
Excluding coil current
ENA=”L”
-
-
0.5
1.0
mA
µA
ENA
LOW-level input voltage
Rise time
*2
Operating current
Stand-by current
ROSC=180k
VENAH
HIGH-level input voltage
Input current
ROSC=180k
fOUT2
*1. Output frequency=(1/256)×Inductance driver frequency
*2. Rise time
VDD-0.5V
ENA
VSS+0.5V
tENA
SEIKO NPC CORPORATION - 4
SM8142B
TYPICAL APPLICATIONS
(1) EL sheet size : 20 to 30cm2
Current consumption : 20mA
Cbypass
0.01μF
470μH
VSS
LDR
OSC
CHV
180kΩ
ENA
OUT1
VDD
OUT2
EL sheet*1
0.1μF
100V
3.0V
Diode:TOSHIBA 1SS403
Coil :MURATA LQH4N471K04M00
(2) EL sheet size : 30 to 50cm2 *2
Current consumption : 40mA
220μH
VSS
LDR
OSC
CHV
Cbypass
0.01μF
180kΩ
1.0kΩ
ENA
OUT1
VDD
OUT2
EL sheet*1
0.1μF
100V
3.0V
Diode:TOSHIBA 1SS403
Coil :MURATA LQH4N221K04M00
SEIKO NPC CORPORATION - 5
SM8142B
(3) EL sheet size : 10 to 15cm2
Current consumption : 20mA
220μH
VSS
LDR
OSC
CHV
Cbypass
0.01μF
180kΩ
1.5V
ENA
OUT1
VDD
OUT2
EL sheet*1
0.1μF
100V
3.0V
Diode:TOSHIBA 1SS403
Coil :MURATA LQH4N221K04M00
(4) EL sheet size : 10 to 20cm2
Current consumption : 26mA
470μH
VSS
Cbypass
0.01μF
LDR
120kΩ
20kΩ
OSC
CHV
ENA
OUT1
VDD
OUT2
EL sheet*1
0.1μF
100V
5.0V
*3
Diode:TOSHIBA 1SS403
Coil :MURATA LQH4N471K04M00
SEIKO NPC CORPORATION - 6
SM8142B
(5) EL sheet size : 30 to 50 cm2 *2
Current consumption : 34mA
470μH
VSS
Cbypass
0.01μF
LDR
120kΩ
20kΩ
OSC
CHV
1.0kΩ
ENA
OUT1
VDD
OUT2
EL sheet*1
0.1μF
100V
5.0V*3
Diode:TOSHIBA 1SS403
Coil :MURATA LQH4N471K04M00
*1. Do not operate the IC with the EL sheet NOT connected (no load to OUT1/OUT2) since the IC will be damaged.
*2. If the EL sheet size is exceeded 30cm2, connect a 1.0kΩ resistor between the EL sheet and the OUT1 pin.
*3. When the supply voltage is exceeded 4.0V, connect a 20kΩ resistor to CHV for current limit, and the OUT1 pin
resistor is set 1.0kΩ (EL sheet size>30cm2) or 1.0kΩ or less (EL sheet size30cm2).
SEIKO NPC CORPORATION - 7
SM8142B
Please pay your attention to the following points at time of using the products shown in this document.
1. The products shown in this document (hereinafter ”Products”) are designed and manufactured to the generally accepted standards of
reliability as expected for use in general electronic and electrical equipment, such as personal equipment, machine tools and
measurement equipment. The Products are not designed and manufactured to be used in any other special equipment requiring
extremely high level of reliability and safety, such as aerospace equipment, nuclear power control equipment, medical equipment,
transportation equipment, disaster prevention equipment, security equipment. The Products are not designed and manufactured to be
used for the apparatus that exerts harmful influence on the human lives due to the defects, failure or malfunction of the Products.
If you wish to use the Products in that apparatus, please contact our sales section in advance.
In the event that the Products are used in such apparatus without our prior approval, we assume no responsibility whatsoever for any
damages resulting from the use of that apparatus.
2. NPC reserves the right to change the specifications of the Products in order to improve the characteristics or reliability thereof.
3. The information described in this document is presented only as a guide for using the Products. No responsibility is assumed by us for any
infringements of patents or other rights of the third parties which may result from its use. No license is granted by implication or otherwise
under any patents or other rights of the third parties. Then, we assume no responsibility whatsoever for any damages resulting from that
infringements.
4. The constant of each circuit shown in this document is described as an example, and it is not guaranteed about its value of the mass
production products.
5. In the case of that the Products in this document falls under the foreign exchange and foreign trade control law or other applicable laws and
regulations, approval of the export to be based on those laws and regulations are necessary. Customers are requested appropriately take
steps to obtain required permissions or approvals from appropriate government agencies.
SEIKO NPC CORPORATION
1-9-9, Hatchobori, Chuo-ku,
Tokyo 104-0032, Japan
Telephone: +81-3-5541-6501
Facsimile: +81-3-5541-6510
http://www.npc.co.jp/
Email:[email protected]
ND11013-E-00 2011.10
SEIKO NPC CORPORATION - 8