SM8146AD1 Ver la hoja de datos (PDF) - Nippon Precision Circuits
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SM8146AD1 Datasheet PDF : 19 Pages
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SM8146AD1
EL Driver IC
OVERVIEW
The SM8146AD1 is a dedicated EL (Electro Luminescence) driver IC, capable of driving EL sheet up to
30cm2 in size. The EL drive circuit uses a technique that generates smooth sine wave EL drive waveforms
without an output resistor, which has the advantage of preventing EL sheet audible noise, eliminating the need
for additional peripheral components and a corresponding drop in power efficiency. Also, the EL drive voltage
is constant-voltage controlled and is unaffected by supply voltage fluctuations, so that there are no EL bright-
ness variations due to supply voltage changes. A dimming function is available under direct control from a
microcontroller. The logic HIGH-level input voltage range (ENA, DIM pins) starts at 1.4V, allowing the device
to be driven directly without external transistors from a Li-ion battery.
FEATURES
APPLICATIONS
I Sine wave EL drive waveforms for low audible
noise
I Constant EL drive voltage independent of supply
voltage fluctuations
I Separate coil and EL drive frequency adjustment
I Enable function (ENA pin)
I Dimming function (DIM pin)
I Direct control capability using 1.8V system CPU
(ENA, DIM pins)
VIH = 1.4V (min, VDD = 2.5 to 5.5V)
I 2.5 to 5.5V supply voltage range
I 170Vp-p (typ) maximum EL drive voltage
I 250Hz (typ) EL drive frequency (ROCE = 200kΩ)
I 0.5mA (typ) operating current
I 1.0µA (max) standby current
I 220µH (typ) recommended inductance
I Package: 10-pin SON
I Cellular phone
I Portable audio equipment
I Handy terminal
I Other portable application
STANDARD CIRCUIT CONFIGURATION
1.4V < VIH < VDD
ON
OFF
OFF
1.4V < VIH < VDD
3.6V
100kΩ
180kΩ
OCL
OCE
DIM
ENA
VDD
VSS
LDR
CHV
OUT1
OUT2
Coil
220µH
Diode
EL sheet
30cm2
1.0µF
OUT1
High voltage
capacitor
0.0022µF
100VDC
OUT2
OUT1 − OUT2
EL drive voltage waveform
ORDERING INFORMATION
Device
SM8146AD1
Package
10-pin SON
SEIKO NPC CORPORATION —1
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