TOKO TK6592x User Manual
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TK6592x
MEDIUM EL LAMP DRIVER
FEATURES
■ High Ratio of Brightness / Input Power
■ Constant Brightness Versus Input Supply Changes
■ Optimized for 9 nf to 27 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)
■ Split Power Supply Application
DESCRIPTION
The TK6592x 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.
The proprietary architecture (detailed in the Theory of
Operation section) of the TK6592x provides a constant
output power to the lamp, independent of variations in the
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
output of the EL driver.
ORDERING INFORMATION
TK6592 MTL
Lamp Frequency Code
LAMP FREQUENCY CODE
TK65920 175 Hz
TK65921* 200 Hz
TK65922 225 Hz
TK65923* 250 Hz
TK65924 275 Hz
TK65925* 300 Hz
TK65926 325 Hz
TK65927* 350 Hz
TK65928 375 Hz
TK65929* 400 Hz
* Consult factory for availability
of other frequencies.
TAPE/REEL CODE
TL: Tape Left
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 TK6592x, 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 TK6592x 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 TK6592x is available in a miniature, 6-pin
SOT23L-6 surface mount package
TK6592x
+
EL
HV
-
EL
BLOCK DIAGRAM
V
CC
HV BOOST
CONTROL
OSCILLATOR
H
BRIDGE
V
CC
GND
IND
IND
GND
HV
EL
EL
+
-
May 2000 TOKO, Inc. Page 1
TK6592x
ABSOLUTE MAXIMUM RATINGS
VCC Pin.................................................................... 6.5 V
All Pins Except V
and GND ...............................V
CC
CLAMP
Power Dissipation (Note 1) ................................ 600 mW
TK6592x 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.
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 44 52 60 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
680 µH
CONV
V
CC
C
EL
12 nF
+
EL
HV GND
-
EL
D
C
47 nF
1
1
V
CC
IND
Note: L1 = Toko Low Profile D52FU Series: 875FU-681 M
D1 = DIODES INC. DL4148
C1 = AVX 12061C473KAT2A
Page 2 May 2000 TOKO, Inc.
TK6592x ELECTRICAL CHARACTERISTICS
VIN = 3.6 V, TA = Tj = 25 °C, unless otherwise specified.
TABLE 1: LAMP FREQUENCY
TOKO PART NO. MIN. TYP. MAX.
TK65920 157 Hz 175 Hz 193 Hz
TK65921 180 Hz 200 Hz 220 Hz
TK65922 202 Hz 225 Hz 248 Hz
TK65923 225 Hz 250 Hz 275 Hz
TK65924 247 Hz 275 Hz 303 Hz
TK65925 270 Hz 300 Hz 330 Hz
TK65926 292 Hz 325 Hz 358 Hz
TK65927 315 Hz 350 Hz 385 Hz
TK65928 337 Hz 375 Hz 413 Hz
TK65929 360 Hz 400 Hz 440 Hz
TABLE 2: OSCILLATOR FREQUENCY
TK6592x
TOKO PART NO. MIN. TYP. MAX.
TK65920 20.1 kHz 22.4 kHz 24.7 kHz
TK65921 23.0 kHz 25.6 kHz 28.2 kHz
TK65922 25.9 kHz 28.8 kHz 31.7 kHz
TK65923 28.8 kHz 32.0 kHz 35.2 kHz
TK65924 31.6 kHz 35.2 kHz 38.8 kHz
TK65925 34.5 kHz 38.4 kHz 42.3 kHz
TK65926 37.4 kHz 41.6 kHz 45.8 kHz
TK65927 40.3 kHz 44.8 kHz 49.3 kHz
TK65928 43.2 kHz 48.0 kHz 52.8 kHz
TK65929 46.1 kHz 51.2 kHz 56.3 kHz
TABLE 3: CONVERTER SUPPLY CURRENT
TOKO PART NO. MIN. TYP. MAX.
TK65920 - 7.8 mA 15.6 mA
TK65921 - 9.0 mA 18.0 mA
TK65922 - 10.1 mA 20.2 mA
TK65923 - 11.2 mA 22.4 mA
TK65924 - 12.3 mA 24.6 mA
TK65925 - 13.4 mA 26.8 mA
TK65926 - 14.5 mA 29.0 mA
TK65927 - 15.6 mA 31.2 mA
TK65928 - 16.8 mA 33.6 mA
TK65929 - 17.9 mA 35.8 mA
May 2000 TOKO, Inc. Page 3
TK6592x
V
(V)
V
(V)
6
TYPICAL PERFORMANCE CHARACTERISTICS
USING TEST CIRCUIT
TK65929 Voltage Waveform Across 12 nF LampTK65921 Voltage Waveform Across 12 nF Lamp
PEAK TO PEAK LAMP VOLTAGE
160
150
140
OUT
130
120
2.5 3 3.5 4 4.5 5 5.5 6
230
220
210
(Hz)
TK65921
vs. SUPPLY VOLTAGE
L1 = 680 µH
L1 = 560 µH
VCC (V)
TK65921
LAMP FREQUENCY
vs. SUPPLY VOLTAGE
PEAK TO PEAK LAMP VOLTAGE
160
150
140
OUT
130
120
2.5 3 3.5 4 4.5 5 5.5 6
460
440
420
(Hz)
TK65929
vs. SUPPLY VOLTAGE
L1 = 680 µH
L1 = 560 µH
VCC (V)
TK65929
LAMP FREQUENCY
vs. SUPPLY VOLTAGE
200
LAMP
F
190
180
2.5 3 3.5 4 4.5 5 5.5
VCC (V)
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
USING TEST CIRCUIT
TK6592x
AVERAGE CONVERTER SUPPLY
CURRENT vs. SUPPLY VOLTAGE
18
16
14
12
(mA)
10
8
CONV
I
6
4
2
0
2.5 3 3.5 4 4.5 5 5.5
PEAK CURRENT THRESHOLD
60
55
50
(mA)
45
PEAK
I
40
TK65921
VCC (V)
TK65921
vs. SUPPLY VOLTAGE
AVERAGE CONVERTER SUPPLY
CURRENT vs. SUPPLY VOLTAGE
26
24
22
20
(mA)
18
16
CONV
I
14
12
10
8
2.5 3 3.5 4 4.5 5 5.5 6
PEAK CURRENT THRESHOLD
60
55
50
(mA)
45
PEAK
I
40
TK65929
VCC (V)
TK65929
vs. SUPPLY VOLTAGE
35
30
2.5 3 3.5 4 4.5 5 5.5 6
VCC (V)
TK65921
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
35
30
2.5 3 3.5 4 4.5 5 5.5 6
VCC (V)
TK65929
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
May 2000 TOKO, Inc. Page 5
TK6592x
V
(V)
V
(V)
F
(H
)
F
(H
)
5
(°C)
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
USING TEST CIRCUIT
PEAK TO PEAK LAMP VOLTAGE
160
150
140
OUT
130
120
110
-50 -25 0 25 50 75 100 125
220
210
z
200
TK65921
vs. TEMPERATURE
VCC = 3.6 V
VCC = 2.7 V
TEMPERATURE (°C)
TK65921
LAMP FREQUENCY
vs. TEMPERATURE
PEAK TO PEAK VOLTAGE
160
150
140
OUT
130
120
110
-50 -25 0 25 50 75 100 125
440
420
z
400
TK65929
vs. TEMPERATURE
VCC = 3.6 V
VCC = 2.7 V
TEMPERATURE (°C)
TK65929
LAMP FREQUENCY
vs. TEMPERATURE
LAMP
190
180
170
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
AVERAGE CONVERTER SUPPLY
CURRENT vs. TEMPERATURE
14
12
10
(mA)
CONV
8
I
6
4
-50 -25 0 25 50 75 100 12
TK65921
TEMPERATURE (°C)
LAMP
380
360
340
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
AVERAGE CONVERTER SUPPLY
CURRENT vs. TEMPERATURE
22
20
18
(mA)
CONV
16
I
14
12
-50 -25 0 25 50 75 100 125
TK65929
TEMPERATURE
Page 6 May 2000 TOKO, Inc.
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