TOKO TK65939MTL, TK65938MTL, TK65937MTL, TK65935MTL, TK65936MTL Datasheet

TK6593x

20P

LARGE EL LAMP DRIVER

FEATURES

■ High Ratio of Brightness / Input Power

■ Constant Brightness Versus Input Supply Changes

■ Optimized for 15 nf to 45 nf Panel Capacitance

■ Panel Voltage Slew Rates Controlled for Life

Enhancement

■ Panel Peak to Peak Voltage Independent of Input

Voltage and Temperature

■ Panel Peak to Peak Frequency Independent of

Input Voltage and Temperature

■ Miniature Package (SOT23L-6)

■ Operates with Miniature Coil

■ Minimum External Components

■ Laser-Trimmed Fixed Frequency Operation

■ PWM Control Method

■ Adjustable Output Voltage

■ Lower Noise (Audio and EMI)

■ Intensity Control Application (Refer to Application

Information)

DESCRIPTION

The TK6593x Electroluminescent (EL) Lamp Driver has
been optimized for battery controlled systems where power
consumption and size are primary concerns. The miniature
device size (SOT23L-6), together with the miniature Toko
EL coils (D32FU, D31FU, D52FU), further helps system
designers reduce the space required to drive the small EL
panels.

APPLICATIONS

■ Battery Powered Systems

■ Cellular Telephones

■ Pagers

■ LCD Modules

■ Wrist Watches

■ Consumer Electronics

The oscillator circuits for the boost converter and lamp
driver are both internally generated in the TK6593x, without
the need for external components. The clock frequency of
the boost converter is laser-trimmed to ensure good initial
accuracy that is relatively insensitive to variations in
temperature and supply voltage. The clock frequency of
the lamp driver tracks the frequency of the boost converter
by a constant scaling factor.

Furthermore, the drive architecture of the TK6593x has
been designed to limit peak drive current delivered to the
lamp. This approach limits the slew rate of the voltage
across the lamp and has the potential to improve lamp life
and decrease RF interference.

The TK6593x is available in a miniature, 6-pin
SOT23L-6 surface mount package.

TK6593x

+

EL

V

CC

The proprietary architecture (detailed in the Theory of
Operation section) of the TK6593x provides a constant
output power to the lamp, independent of variations in the

HV

EL

GND

-

IND

battery voltage. This architecture allows the output voltage
to remain relatively constant as battery voltages decay,
without the need for directly sensing the high voltage

BLOCK DIAGRAM

output of the EL driver.

ORDERING INFORMATION

TK6593 MTL

LAMP FREQUENCY CODE

TK65930 175 Hz
TK65931* 200 Hz
TK65932 225 Hz
TK65933* 250 Hz
TK65934 275 Hz

TK65935* 300 Hz
TK65936 325 Hz
TK65937* 350 Hz
TK65938 375 Hz
TK65939* 400 Hz

Lamp Frequency Code

TAPE/REEL CODE

TL: Tape Left

* Consult factory for availability
of other frequencies.

V

CC

HV BOOST

CONTROL

OSCILLATOR

H

BRIDGE

IND

GND

HV

EL

EL

+

-

May 2000 TOKO, Inc. Page 1

TK6593x

ABSOLUTE MAXIMUM RATINGS

VCC Pin.................................................................... 6.5 V

All Pins Except V

and GND ...............................V

CC

CLAMP

Power Dissipation (Note 1) ................................ 600 mW

TK6593x ELECTRICAL CHARACTERISTICS

VCC = 3.6 V, TA = Tj = 25 °C, unless otherwise specified.

SYMBOL PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

Storage Temperature Range ................... -55 to +150 °C

Operating Temperature Range ...................-30 to +80 °C

Junction Temperature ........................................... 150 °C

V

CC

I

Q

I

PEAK

F

LAMP

F

BOOST

V

CLAMP

D

(MAX)

V

OUT

I

CONV

Note 1: Power dissipation is 600 mW when mounted as recommended (200 mW In Free Air). Derate at 4.8 mW/°C for operation above 25 °C.
Note 2: Converter supply current is dependent upon the DC resistance of inductor L1. Lower DC resistances will result in lower supply currents.
Note 3: When using test circuit below.
Note 4: Refer to Page 5 graph of Peak Current Threshold vs. Supply Voltage.
Gen. Note: Refer to “INDUCTOR VALUE SELECTION” and “INDUCTOR TYPE SELECTION” of Design Considerations Section for choosing

inductor.

Input Supply Range 2.7 3.6 6 V

Quiescent Current Current into pin 6 200 µA
Peak Current Threshold (Note 4) 87 97 107 mA
Lamp Frequency See Table 1 Hz

Boost Frequency See Table 2 kHz
Boost Clamp Voltage Force 100 µA into HV pin 90 105 120 V
Maximum Duty Cycle 88 92 96 %
Peak to Peak Lamp Voltage (Note 3) 125 140 155 V

Converter Supply Current (Notes 2, 3) See Table 3 mA

TEST CIRCUIT

I

L

1

330 µH

CONV

V

CC

C

EL

20 nF

+

EL

HV GND

-

EL

D

C

1

100 nF

1

V

CC

IND

Note: L1 = Toko Low Profile D52FU Series: 875FU-331 M
D1 = DIODES INC. DL4148
C1 = AVX 12061C104KAT2A

Page 2 May 2000 TOKO, Inc.

TK6593x ELECTRICAL CHARACTERISTICS

VIN = 3.6 V, TA = Tj = 25 °C, unless otherwise specified.

TABLE 1: LAMP FREQUENCY

TOKO PART NO. MIN. TYP. MAX.

TK65930 157 Hz 175 Hz 193 Hz
TK65931 180 Hz 200 Hz 220 Hz
TK65932 202 Hz 225 Hz 248 Hz
TK65933 225 Hz 250 Hz 275 Hz
TK65934 247 Hz 275 Hz 303 Hz
TK65935 270 Hz 300 Hz 330 Hz
TK65936 292 Hz 325 Hz 358 Hz
TK65937 315 Hz 350 Hz 385 Hz
TK65938 337 Hz 375 Hz 413 Hz
TK65939 360 Hz 400 Hz 440 Hz

TABLE 2: OSCILLATOR FREQUENCY

TK6593x

TOKO PART NO. MIN. TYP. MAX.

TK65930 20.1 kHz 22.4 kHz 24.7 kHz
TK65931 23.0 kHz 25.6 kHz 28.2 kHz
TK65932 25.9 kHz 28.8 kHz 31.7 kHz
TK65933 28.8 kHz 32.0 kHz 35.2 kHz
TK65934 31.6 kHz 35.2 kHz 38.8 kHz
TK65935 34.5 kHz 38.4 kHz 42.3 kHz
TK65936 37.4 kHz 41.6 kHz 45.8 kHz
TK65937 40.3 kHz 44.8 kHz 49.3 kHz
TK65938 43.2 kHz 48.0 kHz 52.8 kHz
TK65939 46.1 kHz 51.2 kHz 56.3 kHz

TABLE 3: CONVERTER SUPPLY CURRENT

TOKO PART NO. MIN. TYP. MAX.

TK65930 - 14.2 mA 28.4 mA
TK65931 - 16.2 mA 32.4 mA
TK65932 - 18.3 mA 36.6 mA
TK65933 - 20.3 mA 40.6 mA
TK65934 - 22.3 mA 44.6 mA
TK65935 - 24.3 mA 48.6 mA
TK65936 - 26.4 mA 52.8 mA
TK65937 - 28.4 mA 56.8 mA
TK65938 - 30.4 mA 60.8 mA
TK65939 - 32.4 mA 64.8 mA

May 2000 TOKO, Inc. Page 3

TK6593x

V

(V)

V

(V)

TYPICAL PERFORMANCE CHARACTERISTICS

USING TEST CIRCUIT

TK65931 Voltage Waveform

PEAK TO PEAK LAMP VOLTAGE

150

140

130

OUT

120

110

100

2.5 3 3.5 4 4.5 5 5.5 6

230

220

TK65931

vs. SUPPLY VOLTAGE

L1 = 330 µH

L1 = 220 µH

VCC (V)

TK65931

LAMP FREQUENCY

vs. SUPPLY VOLTAGE

TK65939 Voltage Waveform

PEAK TO PEAK LAMP VOLTAGE

140

130

120

OUT

110

100

2.5 3 3.5 4 4.5 5 5.5 6

460

440

TK65939

vs. SUPPLY VOLTAGE

L1 = 330 µH

L1 = 220 µH

VCC (V)

TK65939

LAMP FREQUENCY

vs. SUPPLY VOLTAGE

210

(Hz)

200

LAMP

F

190

180

2.5 3 3.5 4 4.5 5 5.5 6
VCC (V)

420

(Hz)

400

LAMP

F

380

360

2.5 3 3.5 4 4.5 5 5.5 6
VCC (V)

Page 4 May 2000 TOKO, Inc.

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

6

I

(

A)

I

(

A)

USING TEST CIRCUIT

TK6593x

AVERAGE CONVERTER SUPPLY
CURRENT vs. SUPPLY VOLTAGE

30

25

20

(mA)

15

CONV

I

10

5

0

2.5 3 3.5 4 4.5 5 5.5

PEAK CURRENT THRESHOLD

110

100

90

m

TK65931

VCC (V)

TK65931

vs. SUPPLY VOLTAGE

AVERAGE CONVERTER SUPPLY
CURRENT vs. SUPPLY VOLTAGE

60

50

40

(mA)

30

CONV

I

20

10

0

2.5 3 3.5 4 4.5 5 5.5 6

PEAK CURRENT THRESHOLD

110

100

90

m

TK65939

VCC (V)

TK65939

vs. SUPPLY VOLTAGE

80

PEAK

70

60

2.5 3 3.5 4 4.5 5 5.5 6
VCC (V)

TK65931
QUIESCENT CURRENT
vs. SUPPLY VOLTAGE

0

2.5 3 3.5 4 4.5 5 5.5 6
VCC (V)

(µA)
I

200

150

100

Q

50

80

PEAK

70

60

2.5 3 3.5 4 4.5 5 5.5 6
VCC (V)

TK65939

QUIESCENT CURRENT

vs. SUPPLY VOLTAGE

2.5 3 3.5 4 4.5 5 5.5 6
VCC (V)

(µA)
I

200

150

100

Q

50

0

May 2000 TOKO, Inc. Page 5