TOKO TK65919MTL, TK65917MTL, TK65918MTL, TK65916MTL, TK65915MTL Datasheet
...
TK6591x
20P
SMALL EL LAMP DRIVER
FEATURES
■ High Ratio of Brightness / Input Power
■ Constant Brightness Versus Input Supply Changes
■ Optimized for 3.5 nf to 12.5 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 TK6591x 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 TK6591x, 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 TK6591x 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 TK6591x is available in a miniature, 6 pin
SOT23L-6 surface mount package.
TK6591x
+
EL
V
CC
The proprietary architecture (detailed in the Theory of
Operation section) of the TK6591x provides a constant
HV
EL
-
GND
IND
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
BLOCK DIAGRAM
output of the EL driver.
IND
ORDERING INFORMATION
TK6591 MTL
LAMP FREQUENCY CODE
TK65910 175 Hz
TK65911* 200 Hz
TK65912 225 Hz
TK65913* 250 Hz
TK65914 275 Hz
TK65915* 300 Hz
TK65916 325 Hz
TK65917* 350 Hz
TK65918 375 Hz
TK65919* 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
GND
HV
EL
EL
+
-
May 2000 TOKO, Inc. Page 1
TK6591x
ABSOLUTE MAXIMUM RATINGS
VCC Pin.................................................................... 6.5 V
All Pins Except V
and GND ...............................V
CC
CLAMP
Power Dissipation (Note 1) ................................ 600 mW
TK6591x 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 26 32 38 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
820 µH
CONV
V
CC
C
EL
5 nF
+
EL
HV GND
-
EL
D
C
22 nF
1
1
V
CC
IND
Note: L1 = Toko Low Profile D32FU Series: 887FU-821 M
D1 = DIODES INC. DL4148
C1 = AVX 12061C223KAT2A
Page 2 May 2000 TOKO, Inc.
TK6591x ELECTRICAL CHARACTERISTICS
VIN = 3.6 V, TA = Tj = 25 °C, unless otherwise specified.
TABLE 1: LAMP FREQUENCY
TOKO PART NO. MIN. TYP. MAX.
TK65910 157 Hz 175 Hz 193 Hz
TK65911 180 Hz 200 Hz 220 Hz
TK65912 202 Hz 225 Hz 248 Hz
TK65913 225 Hz 250 Hz 275 Hz
TK65914 247 Hz 275 Hz 303 Hz
TK65915 270 Hz 300 Hz 330 Hz
TK65916 292 Hz 325 Hz 358 Hz
TK65917 315 Hz 350 Hz 385 Hz
TK65918 337 Hz 375 Hz 413 Hz
TK65919 360 Hz 400 Hz 440 Hz
TABLE 2: OSCILLATOR FREQUENCY
TK6591x
TOKO PART NO. MIN. TYP. MAX.
TK65910 20.1 kHz 22.4 kHz 24.7 kHz
TK65911 23.0 kHz 25.6 kHz 28.2 kHz
TK65912 25.9 kHz 28.8 kHz 31.7 kHz
TK65913 28.8 kHz 32.0 kHz 35.2 kHz
TK65914 31.6 kHz 35.2 kHz 38.8 kHz
TK65915 34.5 kHz 38.4 kHz 42.3 kHz
TK65916 37.4 kHz 41.6 kHz 45.8 kHz
TK65917 40.3 kHz 44.8 kHz 49.3 kHz
TK65918 43.2 kHz 48.0 kHz 52.8 kHz
TK65919 46.1 kHz 51.2 kHz 56.3 kHz
TABLE 3: CONVERTER SUPPLY CURRENT
TOKO PART NO. MIN. TYP. MAX.
TK65910 - 3.2 mA 6.4 mA
TK65911 - 3.6 mA 7.2 mA
TK65912 - 4.1 mA 8.2 mA
TK65913 - 4.5 mA 9.0 mA
TK65914 - 5.0 mA 10.0 mA
TK65915 - 5.4 mA 10.8 mA
TK65916 - 5.8 mA 11.6 mA
TK65917 - 6.3 mA 12.6 mA
TK65918 - 6.7 mA 13.4 mA
TK65919 - 7.2 mA 14.4 mA
May 2000 TOKO, Inc. Page 3
TK6591x
V
(V)
V
(V)
TYPICAL PERFORMANCE CHARACTERISTICS
USING TEST CIRCUIT
TK65911 Voltage Waveform Across 5 nF Lamp
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
TK65911
vs. SUPPLY VOLTAGE
L1 = 820 µH
L1 = 680 µH
VCC (V)
TK65911
LAMP FREQUENCY
vs. SUPPLY VOLTAGE
TK65919 Voltage Waveform Across 5 nF Lamp
PEAK TO PEAK LAMP VOLTAGE
150
140
130
OUT
120
110
100
2.5 3 3.5 4 4.5 5 5.5 6
460
440
TK65919
vs. SUPPLY VOLTAGE
L1 = 820 µH
L1 = 680 µH
VCC (V)
TK65919
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.)
USING TEST CIRCUIT
TK6591x
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 6
PEAK CURRENT THRESHOLD
35
33
31
(mA)
29
PEAK
I
TK65911
VCC (V)
TK65911
vs. SUPPLY VOLTAGE
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 6
PEAK CURRENT THRESHOLD
35
33
31
(mA)
29
PEAK
I
TK65919
VCC (V)
TK65919
vs. SUPPLY VOLTAGE
27
25
2.5 3 3.5 4 4.5 5 5.5 6
VCC (V)
TK65911
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
27
25
2.5 3 3.5 4 4.5 5 5.5 6
VCC (V)
TK65919
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
TK6591x
V
(V)
V
(V)
F
(H
)
F
(H
)
(°C)
(°C)
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
USING TEST CIRCUIT
PEAK TO PEAK LAMP VOLTAGE
140
130
120
OUT
110
100
90
-50 -25 0 25 50 75 100 125
220
210
z
200
TK65911
vs. TEMPERATURE
VIN = 3.6 V
VIN = 2.7 V
TEMPERATURE (°C)
TK65911
LAMP FREQUENCY
vs. TEMPERATURE
PEAK TO PEAK LAMP VOLTAGE
140
130
120
OUT
110
100
90
-50 -25 0 25 50 75 100 125
440
420
z
400
TK65919
vs. TEMPERATURE
VIN = 3.6 V
VIN = 2.7 V
TEMPERATURE (°C)
TK65919
LAMP FREQUENCY
vs. TEMPERATURE
LAMP
190
180
170
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
AVERAGE CONVERTER SUPPLY
CURRENT vs. TEMPERATURE
6
5
4
(mA)
CONV
3
I
2
1
-50 -25 0 25 50 75 100 125
TK65911
TEMPERATURE
LAMP
380
360
340
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
AVERAGE CONVERTER SUPPLY
CURRENT vs. TEMPERATURE
10
9
8
(mA)
CONV
7
I
6
5
-50 -25 0 25 50 75 100 125
TK65919
TEMPERATURE
Page 6 May 2000 TOKO, Inc.
Loading...