SM8142
NIPPON PRECISION CIRCUITS INC.
EL Sheet Driver
OVERVIEW
The SM8142 is a transformer-less electroluminescent (EL) sheet lamp driver, capable of driving sheets up to
30 cm
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.
* : SM8142×D
FEATURES
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Dedicated EL driver
Noise-less smooth drive waveform
High-efficiency output circuit
Two oscillator circuits built-in (SM8142A)
Stand-by function (SM8142B)
Stable temperature characteristics
Ultra-small package
1.6 to 5.5 V supply voltage
0.3 mA typ. (V
DD
= 3.0 V) current consumption
(excluding coil current)
200 Vp-p maximum EL driver voltage
31 to 1000 Hz EL drive frequency range
0.22 mH minimum coil inductance
ORDERING INFORMATION
D e vice
SM8142AD
SM8142BD
SM8142AV
SM8142BV
P ackag e
8-pin SON
8-pin SON
8-pin V S O P
8-pin V S O P
NIPPON PRECISION CIRCUITS—1
SM8142
PINOUT
(Top View)
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PACKAGE DIMENSIONS
(Unit : mm)
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8-pin SON
SM8142AD
8-pin SON
2.90 ± 0.1
2.80 ± 0.1
0.125 ± 0.05
OCL 2
OCE 3
VDD 4
7 CHV
6 OUT1
0.48typ
SM8142BD
0.65
0.05
+ 0.1
0.30
−
0.05
0.05
M
VSS 1
8
LDR
0.20 ± 0.08
OSC 2
ENA 3
VDD 4
7 CHV
6 OUT1
5 OUT2
0.20 ± 0.08
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8-pin VSOP
SM8142AV
8-pin VSOP
CHV
LDR
VSS
OCL
1
2
3
4
8
7
OUT1
OUT2
4.4
± 0.2
8142A
6
5
VDD
OCE
6.4
±
0.3
+ 0.1
0.80
−
0.05
5 OUT2
3.00 ± 0.1
VSS 1
8
LDR
0.575 typ
SM8142BV
3.1
±
0.3
1.15
± 0.05
0.15
−
0.05
+
0.1
CHV
LDR
VSS
OSC
1
2
3
4
8
7
OUT1
OUT2
VDD
ENA
8142B
6
5
0.22
± 0.1
NIPPON PRECISION CIRCUITS—2
0.1
± 0.05
0.65
0.5
± 0.2
4 2A
4 2B
SM8142
BLOCK DIAGRAM
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SM8142A
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SM8142B
EL sheet
EL sheet
VDD
LDR
CHV
OUT1
OUT2
VDD
LDR
CHV
OUT1
OUT2
High Voltage
Switching Circuit
High Voltage
Switching Circuit
Dividing Circuit
Dividing Circuit
Dividing Circuit
Dividing Circuit
Oscillator for
Boosting Voltage
VSS
OCL
Oscillator for
EL Driving
OCE
VSS
Oscillator for
Boosting Voltage and EL Driving
OSC
ENA
PIN DESCRIPTION
Pin nu m b e r
Ver.
VSOP-8
1
2
3
SON-8
7
8
1
A/B
A/B
A/B
A
4
2
B
A
5
6
7
8
3
B
4
5
6
A/B
A/B
A/B
ENA
VDD
OUT2
OUT1
OSC
OCE
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Ip
1
–
O
O
CHV
LDR
VSS
OCL
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–
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High-voltage DC input
Booster coil driver output
Ground
Coil driver oscillator (oscillator frequency determined by external resistor)
Coil and EL driver oscillator
(oscillator frequency determined by external resistor)
EL driver oscillator (oscillator frequency determined by external resistor)
E n a ble input (HIGH: enable, LOW : disable)
Supply
Output 2
Output 1
Name
I/O
Function
1. Built-in pull-down resistor
NIPPON PRECISION CIRCUITS—3
SM8142
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
≤
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
100
−
55 to 125
Unit
V
V
V
V
V
mW
°C
Recommended Operating Conditions
Rating
P arameter
Supply voltage range
Operating temperature
Operating current
1
Coil inductance
Symbol
V
DD2
T
O P R
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D D 2
L
LDR2
Including coil current, V
D D
=
3.0V
Including coil current, V
D D
=
5.0V
f
L D R
= 64 kHz
Condition
min
1.6
−
40
–
–
–
typ
3.0
–
–
–
0.47
max
5.5
85
60
mA
36
–
mH
V
°C
Unit
1. Max value is as same as Absolute Maximum Ratings.
NIPPON PRECISION CIRCUITS—4
SM8142
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
A
OCE oscillator frequency range
OCL oscillator frequency
A
OCL oscillator frequency range
OSC oscillator frequency
B
OSC oscillator frequency range
OUT1, OUT2 output frequency
A/B
OUT1, OUT2 output frequency range
LDR inductance driver frequency
A/B
LDR inductance driver frequency range
ENA HIGH-level input voltage
B
E N A L OW -level input voltage
ENA input current
Operating current
Stand-by current
B
A/B
B
Ver.
A/B
A/B
A/B
A/B
A/B
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 S C 1
f
O S C 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
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E N A H
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D D 1
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S T B
ENA = “H”, V
D D
= 1.6 to 5.5V
ENA = “L”, V
D D
= 1.6 to 5.5V
V
E N A H
= V
D D
= 3.0V
Excluding coil current
ENA = “L”
R
O C L
/R
O S C
= 180 kΩ
R
O C E
/R
O S C
= 180 kΩ
R
O S C
= 180 kΩ
R
O C L
= 180 kΩ
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L D R
= 50 mA
R
O C E
= 180 kΩ
Condition
min
1.6
0.5
–
–
–
205
32
205
32
205
32
200
31
51
8
V
D D
– 0.5
V
S S
– 0.3
2.0
–
–
typ
3.0
–
–
–
8.0
256
–
256
–
256
–
250
–
64
–
–
–
4.0
–
–
max
5.5
100
100
0.5
12.0
307
kHz
1024
307
kHz
1024
307
kHz
1024
300
Hz
1000
77
kHz
256
V
D D
+ 0.3
V
S S
+ 0.5
6.0
0.5
1.0
µA
mA
µA
V
V
V
V
V
Ω
Unit
NIPPON PRECISION CIRCUITS—5
京公网安备 11010802033920号
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