SM8143A - Nippon Precision Circuits, Inc.

SM8143A

NIPPON PRECISION CIRCUITS—1

NIPPON PRECISION CIRCUITS INC.

EL Sheet Driver

OVERVIEW

The SM8143A is a transformer-less electroluminescent (EL) driver IC, capable of driving displays up to 80

in size. It is a high-efﬁcienc y dri v er that features re vised coil switching transistor ON resistance and output

circuit conﬁguration to reduce loss.

The EL drive frequency and coil drive frequency can be controlled independently, making the driver circuit

optimizable to match application requirements. A microcontroller interface pin (ENA) is provided, which can

be used to control the EL driver ON/OFF function. The device is available in 16-pin VSOP packages.

FEATURES

■

Dedicated EL driver

■

1.6 to 5.5 V supply voltage

■

150mA maximum operating current

= 3.0V, Ta

≤

■

3.5

Ω

typical output resistance

■

200 Vp-p maximum EL driver voltage*

■

31 to 1500 Hz EL drive frequency range*

■

High voltage CMOS Process

■

16-pin VSOP plastic package

*: Adjustable with external resistance.

APPLICATIONS

■

Hand held PC, Palm size PC

■

Mobile IT equipment

■

White EL

ORDERING INFORMATION

PINOUT

(Top view)

PACKAGE DIMENSIONS

(Unit : mm)

Device Package

SM8143AV 16-pin VSOP

N.C.

CHV

N.C.

LDR

N.C.

VSS

N.C.

OUT1

N.C.

OUT2

N.C.

VDD

ENA

OCL OCE

8143AV

4.4 0.2

6.4 0.2

5.1 0.2

1.15 0.1

0.10 0.05

0.22+ 0.10

- 0.05

010

0.5 0.2

0.275TYP

0.65 0.10

0.12 M

0.15

+ 0.1

- 0.05

SM8143A

NIPPON PRECISION CIRCUITS—2

BLOCK DIAGRAM

PIN DESCRIPTION

Note: Brightness and operating current are adjusted with R

OCL

EL driving frequency is adjusted with R

OCE

Pin number Name I / O Function

1 N.C. – No connection (must be open)

2 C H V I High-voltage DC input

3 N.C. – No connection (must be open)

4 L DR O Booster coil driver output

5 N.C. – No connection (must be open)

6 VSS – Ground

7 N.C. – No connection (must be open)

8 OCL I Coil driver oscillator (oscillator frequency deter mined by exter nal resistor)

9 OCE I EL d river oscillator (oscillator frequency deter mined by exter nal resistor)

10 ENA I Enable input (built-in pull-down resistor)

11 VDD – Supply

12 N.C. – No connection (must be open)

13 OUT2 O Output 2

14 N.C. – No connection (must be open)

15 OUT1 O Output 1

16 N.C. – No connection (must be open)

VSS OCL OCE

VDD CHVLDR OUT2OUT1

Oscillator for

Boosting

Switching Circuit

Dividing Circuit

1/4

Oscillator for

EL driving

Dividing Circuit

1/1024

ENA

Boosting Block

ENA from microcontroller

EL sheet

80cm2

When ENA is logical "H", SM8143A is active.

ROCL ROCE

Oscillation Block

SM8143A

NIPPON PRECISION CIRCUITS—3

SPECIFICATIONS

Absolute Maximum Ratings

Recommended Operating Conditions

Parameter Symbol Condition Rating Unit

Supply voltage range V

−

0.3 to 7.0 V

Input voltage range V

All Input pins V

−

0.3 to V

+ 0.3 V

Output voltage

CHV

CHV pin 0.5 to 120 V

LDR

LDR pin 0.5 to 120 V

OUT1/2

OUT1, OUT2 pin 0.5 to 120 V

P ower dissipation P

≤

C 200 mW

≤

C 140 mW

Storage temperature range T

STG

−

55 to 125

Parameter Symbol Condition Rating Unit

min typ max

Supply voltage range V

DD2

1.6 3.0 5.5 V

Operating temperature T

OPR

−

40 – 85

Operating current

DD2

Including coil current, V

3.0V, T

≤

C – – 150 mA

Including coil current, V

5.0V, T

≤

C – – 100 mA

Including coil current, V

3.0V, T

≤

C – – 105 mA

Including coil current, V

5.0V, T

≤

C– – 70 mA

Coil inductance L

LDR

= 64 kHz – 0.47 – mH

1. Max value is as same as Absolute Maximum Ratings.

SM8143A

NIPPON PRECISION CIRCUITS—4

DC Characteristics

= 3.0 V, T

= 25

C unless otherwise noted.

Parameter Symbol Condition Rating Unit

min typ max

Supply voltage V

1.6 3.0 5.5 V

CHV output voltage V

CHV

0.5 – 100 V

OUT1, OUT2 HIGH-level output voltage V

OUTH

– – 100 V

OUT1, OUT2 LOW-level output voltage V

OUTL

– – 0.5 V

LDR output resistance R

LDR

= 50 mA – 3.5 5.25

Ω

OCE oscillator frequency f

OCE1

OCE

= 180 k

Ω

205 256 307 kHz

OCE oscillator frequency range f

OCE2

32 – 1536

OCL oscillator frequency f

OCL1

OCL

= 180 k

Ω

205 256 307 kHz

OCL oscillator frequency range f

OCL2

32 – 1536

OUT1, OUT2 output frequency f

OUT1

OCE

= 180 k

Ω

200 250 300 Hz

OUT1, OUT2 output frequency range f

OUT2

31 – 1500

LDR inductance driver frequency f

LDR1

OCL

= 180 k

Ω

51 64 77 kHz

LDR inductance driver frequency range f

LDR2

8 – 384

ENA HIGH-level input voltage V

ENAH

ENA = HIGH, V

= 1.6 to 5.5V V

– 0.5 – V

+ 0.3 V

ENA LOW-level input voltage V

ENAL

ENA = LOW, V

= 1.6 to 5.5V V

– 0.3 – V

+ 0.5

ENA input current I

ENAH

= V

= 3.0V 2.0 4.0 6.0

ENA rise time

ENA

– – 100

Operating current I

DD1

Excluding coil current – – 1.0 mA

Stand-by current I

STB

ENA = LOW – – 1.0

tENA

VSS

VDD

VDD − 0.5

VSS + 0.5

ENA

SM8143A

NIPPON PRECISION CIRCUITS—5

TYPICAL APPLICATIONS

■

EL sheet size: 20 to 30cm

, Current consumption: 20mA

■

EL sheet size: 30 to 50cm

, Current consumption: 40mA

■

EL sheet size: 50 to 100cm

, Current consumption: 80mA

Note: Do not operate the SM8143A with the EL sheet NOT connected (no load to OUT1/OUT2) since the IC will be damaged.

N.C.

VDD

N.C.

470µH

Diode: TOSHIBA 1SS250

Coil: MURATA LQH4N471K04M00

180kΩ

EL sheet

0.1µF

100V

3.0V

CHV

N.C.

LDR

N.C.

VSS

N.C.

OCL

OUT1

N.C.

OUT2

N.C.

ENA

OCE

180kΩ

0.01µF

N.C.

VDD

N.C.

470µH

Diode: TOSHIBA 1SS250

Coil: MURATA LQH4N471K04M00

180kΩ

0.1µF

100V

3.0V

CHV

N.C.

LDR

N.C.

VSS

N.C.

OCL

OUT1

N.C.

OUT2

N.C.

ENA

OCE

360kΩ

0.01µF

EL sheet

N.C.

VDD

N.C.

330µH

Diode: TOSHIBA 1SS250

Coil: TOKO D73LC (817CE331M)

180kΩ

0.1µF

100V

3.0V

CHV

N.C.

LDR

N.C.

VSS

N.C.

OCL

OUT1

N.C.

OUT2

N.C.

ENA

OCE

510kΩ

0.01µF

EL sheet

SM8143A

NIPPON PRECISION CIRCUITS—6

NIPPON PRECISION CIRCUITS INC. reserves the right to make changes to the products described in this data sheet in order to

improve the design or performance and to supply the best possible products. Nippon Precision Circuits Inc. assumes no responsibility fo r

the use of any circuits shown in this data sheet, conveys no license under any patent or other rights, and makes no claim that the circuits

are free from patent infringement. Applications for any devices shown in this data sheet are for illustration only and Nippon Precision

Circuits Inc. m akes no claim or warranty that such applications will be suitable for the use speciﬁed without fur ther testing or modiﬁcation.

The products described in this data sheet are not intended to use for the apparatus which inﬂuence human lives due to the failure or

malfunction of the products. Customers are requested to comply with applicable laws and regulations in effect now and hereinafter,

including compliance with export controls on the distribution or dissemination of the products. Customers shall not export, directly or

indirectly, any products without ﬁrst obtaining required licenses and approvals from appropriate government agencies.

NIPPON PRECISION CIRCUITS INC.

4-3, Fukuzumi 2-chome

Koto-ku, Tokyo 135-8430, Japan

Telephone: 03-3642-6661

Facsimile: 03-3642-6698

NC9923AE 2000.05

NIPPON PRECISION CIRCUITS INC.