NPC SM8142AD, SM8142AV, SM8142BD, SM8142BV Datasheet
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
2
30 cm
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
■
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
(excluding coil current)
■
200 Vp-p maximum EL driver voltage
■
31 to 1000 Hz EL drive frequency range
■
0.22 mH minimum coil inductance
= 3.0 V) current consumption
DD
ORDERING INFORMATION
De vice Pack ag e
SM8142AD 8-pin SON
SM8142BD 8-pin SON
SM8142AV 8-pin VSOP
SM8142BV 8-pin VSOP
NIPPON PRECISION CIRCUITS—1
SM8142
PINOUT
■
8-pin SON
(Top View)
SM8142AD
1
VSS
OCL
2
3
OCE
4VDD OUT2
SM8142BD
1
VSS
OSC
2
3
ENA
4VDD OUT2
8
LDR
4A
7
6
5
8
CHV
OUT1
LDR
2
4B
7
6
5
CHV
OUT1
2
PACKAGE DIMENSIONS
■
8-pin SON
2.90 ± 0.1
2.80 ± 0.1
0.48typ
0.125 ± 0.05
0.65
0.30
+ 0.1
− 0.05
+ 0.1
0.05
0.05
0.20 ± 0.08
(Unit : mm)
3.00 ± 0.1
− 0.05
0.80
M
0.20 ± 0.08
■
8-pin VSOP
SM8142AV
1CHV
2LDR
3VSS
8142A
4OCL 5 OCE
8 OUT1
7 OUT2
6 VDD
SM8142BV
1CHV
2LDR
3VSS
8142B
4OSC 5 ENA
8 OUT1
7 OUT2
6 VDD
8-pin VSOP
■
0.575 typ
0.65
3.1 ± 0.3
0.22 ± 0.1
4.4 ± 0.2
1.15 ± 0.05
0.1 ± 0.05
6.4 ± 0.3
0.15
0.5 ± 0.2
0.1
+
0.05
−
NIPPON PRECISION CIRCUITS—2
BLOCK DIAGRAM
SM8142
■
SM8142A
EL sheet
VDD CHVLDR OUT2OUT1
High Voltage
Switching Circuit
Dividing Circuit
Oscillator for
Boosting Voltage
VSS OCL
Dividing Circuit
Oscillator for
EL Driving
OCE
■
SM8142B
EL sheet
VDD CHVLDR OUT2OUT1
High Voltage
Switching Circuit
Dividing Circuit
Boosting Voltage and EL Driving
VSS OSC
Dividing Circuit
Oscillator for
ENA
PIN DESCRIPTION
Pin number
VSOP-8 SON-8
1 7 A/B C H V I High-voltage DC input
2 8 A/ B LD R O Booster coil driver output
3 1 A/B VS S – Ground
42
53
6 4 A/B VD D – Supply
7 5 A/B OU T 2 O Output 2
8 6 A/B OU T 1 O Output 1
1. Built-in pull-down resistor
Ver. Na me I / O Function
A O CL I Coil driver oscillator (oscillator frequency determined by external resistor)
B OSC I
Coil and EL driver oscillator
(oscillator frequency determined by external resistor)
A OCE I E L d r iver oscillator (oscillator frequency determined by external resistor)
B ENA Ip
1
En a ble input (HIGH: enable, LOW: disable)
NIPPON PRECISION CIRCUITS—3
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