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Электронный компонент: TK65930M

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May 2000 TOKO, Inc.
Page 1
TK6593x
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.
HV
VCC
EL+
IND
GND
HV BOOST
CONTROL
H
BRIDGE
OSCILLATOR
EL-
HV
VCC
IND
EL-
GND
EL+
BLOCK DIAGRAM
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.
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
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.
TK6593x
20P
ORDERING INFORMATION
TAPE/REEL CODE
TL: Tape Left
Lamp Frequency Code
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
* Consult factory for availability
of other frequencies.
APPLICATIONS
s
Battery Powered Systems
s
Cellular Telephones
s
Pagers
s
LCD Modules
s
Wrist Watches
s
Consumer Electronics
LARGE EL LAMP DRIVER
FEATURES
s
High Ratio of Brightness / Input Power
s
Constant Brightness Versus Input Supply Changes
s
Optimized for 15 nf to 45 nf Panel Capacitance
s
Panel Voltage Slew Rates Controlled for Life
Enhancement
s
Panel Peak to Peak Voltage Independent of Input
Voltage and Temperature
s
Panel Peak to Peak Frequency Independent of
Input Voltage and Temperature
s
Miniature Package (SOT23L-6)
s
Operates with Miniature Coil
s
Minimum External Components
s
Laser-Trimmed Fixed Frequency Operation
s
PWM Control Method
s
Adjustable Output Voltage
s
Lower Noise (Audio and EMI)
s
Intensity Control Application (Refer to Application
Information)
Page 2
May 2000 TOKO, Inc.
TK6593x
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 L
1
. 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.
TK6593x ELECTRICAL CHARACTERISTICS
V
CC
= 3.6 V, T
A
= T
j
= 25
C, unless otherwise specified.
ABSOLUTE MAXIMUM RATINGS
V
CC
Pin .................................................................... 6.5 V
All Pins Except V
CC
and GND ............................... V
CLAMP
Power Dissipation (Note 1) ................................ 600 mW
Storage Temperature Range ................... -55 to +150
C
Operating Temperature Range ................... -30 to +80
C
Junction Temperature ........................................... 150
C
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
V
CC
Input Supply Range
2.7
3.6
6
V
I
Q
Quiescent Current
Current into pin 6
200
A
I
PEAK
Peak Current Threshold
(Note 4)
87
97
107
mA
F
LAMP
Lamp Frequency
See Table 1
Hz
F
BOOST
Boost Frequency
See Table 2
kHz
V
CLAMP
Boost Clamp Voltage
Force 100 A into HV pin
90
105
120
V
D
(MAX)
Maximum Duty Cycle
88
92
96
%
V
OUT
Peak to Peak Lamp Voltage
(Note 3)
125
140
155
V
I
CONV
Converter Supply Current
(Notes 2, 3)
See Table 3
mA
TEST CIRCUIT
CEL
20 nF
VCC
C1
100 nF
D1
EL +
HV
GND
IND
EL -
VCC
L1
330 H
ICONV
Note: L
1
= Toko Low Profile D52FU Series: 875FU-331 M
D
1
= DIODES INC. DL4148
C
1
= AVX 12061C104KAT2A
May 2000 TOKO, Inc.
Page 3
TK6593x
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
TK6593x ELECTRICAL CHARACTERISTICS
V
IN
= 3.6 V, T
A
= T
j
= 25
C, unless otherwise specified.
TABLE 1: LAMP FREQUENCY
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 2: OSCILLATOR FREQUENCY
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
TABLE 3: CONVERTER SUPPLY CURRENT
Page 4
May 2000 TOKO, Inc.
TK6593x
TYPICAL PERFORMANCE CHARACTERISTICS
USING TEST CIRCUIT
TK65931 Voltage Waveform
TK65939 Voltage Waveform
TK65931
PEAK TO PEAK LAMP VOLTAGE
vs. SUPPLY VOLTAGE
VCC (V)
2.5 3 3.5 4 4.5 5 5.5 6
V
OUT

(V)
100
120
130
140
150
L
1
= 330 H
110
L
1
= 220 H
TK65939
PEAK TO PEAK LAMP VOLTAGE
vs. SUPPLY VOLTAGE
VCC (V)
2.5 3 3.5 4 4.5 5 5.5 6
V
OUT

(V)
100
110
120
130
140
L1 = 330 H
L1 = 220 H
TK65931
LAMP FREQUENCY
vs. SUPPLY VOLTAGE
VCC (V)
2.5 3 3.5 4 4.5 5 5.5 6
F
LAMP
(Hz)
190
200
210
220
230
180
TK65939
LAMP FREQUENCY
vs. SUPPLY VOLTAGE
VCC (V)
2.5 3 3.5 4 4.5 5 5.5 6
F
LAMP
(Hz)
360
380
400
420
440
460
May 2000 TOKO, Inc.
Page 5
TK6593x
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
USING TEST CIRCUIT
TK65931
AVERAGE CONVERTER SUPPLY
CURRENT vs. SUPPLY VOLTAGE
VCC (V)
2.5 3 3.5 4 4.5 5 5.5 6
I CONV
(m
A)
0
5
10
15
20
25
30
TK65939
AVERAGE CONVERTER SUPPLY
CURRENT vs. SUPPLY VOLTAGE
VCC (V)
2.5 3 3.5 4 4.5 5 5.5 6
I CONV
(m
A)
0
10
20
30
40
50
60
TK65931
PEAK CURRENT THRESHOLD
vs. SUPPLY VOLTAGE
VCC (V)
2.5 3 3.5 4 4.5 5 5.5 6
I PEAK

(
m
A)
60
70
80
90
100
110
TK65939
PEAK CURRENT THRESHOLD
vs. SUPPLY VOLTAGE
VCC (V)
2.5 3 3.5 4 4.5 5 5.5 6
I PEAK

(
m
A)
60
90
110
70
80
100
TK65931
QUIESCENT CURRENT
vs. SUPPLY VOLTAGE
VCC (V)
2.5 3 3.5 4 4.5 5 5.5 6
I Q
(
A)
0
50
100
150
200
TK65939
QUIESCENT CURRENT
vs. SUPPLY VOLTAGE
VCC (V)
2.5 3 3.5 4 4.5 5 5.5 6
I Q
(
A)
0
100
150
50
200
Page 6
May 2000 TOKO, Inc.
TK6593x
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
USING TEST CIRCUIT
TK65931
PEAK TO PEAK LAMP VOLTAGE
vs. TEMPERATURE
TEMPERATURE (
C)
-50 -25 0 25 50 75 100 125
V
OUT

(V)
90
100
120
130
150
160
VCC = 3.6 V
VCC = 2.7 V
110
140
TK65939
PEAK TO PEAK LAMP VOLTAGE
vs. TEMPERATURE
TEMPERATURE (
C)
-50 -25 0 25 50 75 100 125
V
OUT

(V)
90
100
120
130
140
160
VCC = 3.6 V
VCC = 2.7 V
110
150
TK65931
LAMP FREQUENCY
vs. TEMPERATURE
TEMPERATURE (
C)
-50 -25 0 25 50 75 100 125
F
LAMP

(H
z
)
170
180
190
200
210
220
TK65939
LAMP FREQUENCY
vs. TEMPERATURE
TEMPERATURE (
C)
-50 -25 0 25 50 75 100 125
F
LAMP

(H
z
)
340
360
380
400
420
440
TK65931
AVERAGE CONVERTER SUPPLY
CURRENT vs. TEMPERATURE
TEMPERATURE (
C)
-50 -25 0 25 50 75 100 125
I CONV
(mA)
0
5
10
15
20
25
TK65939
AVERAGE CONVERTER SUPPLY
CURRENT vs. TEMPERATURE
TEMPERATURE (
C)
-50 -25 0 25 50 75 100 125
I CONV
(mA)
20
25
30
35
40
45
May 2000 TOKO, Inc.
Page 7
TK6593x
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
USING TEST CIRCUIT
TK65931
PEAK CURRENT THRESHOLD
vs. TEMPERATURE
TEMPERATURE (
C)
-50 -25 0 25 50 75 100 125
I PEAK
(
m
A)
60
70
80
100
110
90
VCC = 3.6 V
VCC = 2.7 V
TK65939
PEAK CURRENT THRESHOLD
vs. TEMPERATURE
TEMPERATURE (
C)
-50 -25 0 25 50 75 100 125
I PEAK
(
m
A)
60
70
80
90
100
110
V
CC
= 3.6
V
CC
= 2.7
TK65931
QUIESCENT CURRENT
vs. TEMPERATURE
TEMPERATURE (
C)
-50 -25 0 25 50 75 100 125
I Q
(
A)
50
60
70
80
90
100
TK65939
QUIESCENT CURRENT
vs. TEMPERATURE
TEMPERATURE (
C)
-50 -25 0 25 50 75 100 125
I Q
(
A)
70
80
90
100
110
120
Page 8
May 2000 TOKO, Inc.
TK6593x
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
USING D
(MAX)
TEST CIRCUIT
TK65931
MAXIMUM DUTY CYCLE
vs. SUPPLY VOLTAGE
VCC (V)
2.5 3 3.5 4 4.5 5 5.5 6
D
(MAX)

(%)
90
91
92
93
94
95
TK65939
MAXIMUM DUTY CYCLE
vs. SUPPLY VOLTAGE
VCC (V)
2.5 3 3.5 4 4.5 5 5.5 6
D
(MAX)
(%)
90
91
92
93
94
95
TK65931
MAXIMUM DUTY CYCLE
vs. TEMPERATURE
TEMPERATURE (
C)
-50 -25 0 25 50 75 100 125
D
(MAX)
(%)
90
91
92
93
94
95
TK65939
MAXIMUM DUTY CYCLE
vs. TEMPERATURE
TEMPERATURE (
C)
-50 -25 0 25 50 75 100 125
D
(MAX)
(%)
90
91
92
93
94
95
D
(MAX)
TEST CIRCUIT
Note: R
1
= 470
VCC
EL +
HV
GND
IND
EL -
VCC
R1
May 2000 TOKO, Inc.
Page 9
TK6593x
clock is generated by dividing the high frequency clock by
128; this lower frequency clock corresponds to the drive
frequency of the EL Lamp. The laser-trimmed oscillators
are relatively insensitive to variations in temperature and
supply voltage. Therefore, they provide good control of the
lamp color emitted by the panel.
The circuit below illustrates a typical application where the
TK6593x is driving a 3-square-inch EL Lamp with a
capacitance of approximately 20 nF.
By keeping the ratio of the boost frequency and the H-
Bridge frequency constant, the peak-to-peak output voltage
from the TK6593x becomes primarily dependent upon the
capacitance of the EL Lamp, the peak current threshold of
the boost converter, and the value of the inductive element
used in the boost converter. For the TK6593x, the peak
current threshold is laser-trimmed to 97 mA. The capacitive
load of the EL Lamp is a function of panel size and is
typically fixed. Therefore, the high voltage output of the
boost converter can be set to a desired voltage by selecting
the appropriate value of the inductive element used in the
boost converter.
I
PEAK
= Boost Peak Current Threshold (97 mA)
C
EL
= Capacitance of EL Lamp
L = Inductance Value
V
HV
= (I
PEAK
/ 2) x (L /C
EL
) x 128
THEORY OF OPERATION
An Electroluminescent (EL) Lamp is a strip of plastic,
coated with a phosphorous material that emits light when
a high voltage AC signal is applied to the terminals of the
device. EL panels have the ability to light the entire panel
uniformly. Because of this, they are gradually becoming
more popular and widespread than LEDs. The amount of
light emitted from an EL Lamp is typically proportional to
the magnitude of the voltage applied to the lamp.
Furthermore, the color of the light emitted by an EL Lamp
is somewhat dependent upon the frequency of the applied
drive signal. For most applications, a peak-to-peak voltage
of 100 to 170 V, with a drive frequency of 175 to 400 Hz,
provides optimal trade-off between lamp intensity and
power consumption.
The capacitance of the EL Panel is typically proportional to
the size of the lamp (a 1 square inch EL Panel typically
exhibits approximately 5 nF of capacitance load). The
TK6593x series of devices has been optimized to drive EL
panels, which are approximately 3-6 square inches in size.
The Boost section of the TK6593x consists of a controller
for stepping up a relatively low voltage (2.7 to 6 V) to a
much higher voltage (50 to 90 V) needed to drive the EL
Lamp. The boost section of the TK6593x uses a proprietary
architecture which provides a relatively constant output
power, independent of the input supply, without the need
for sensing the high voltage output of the boost converter.
By controlling the peak current through the switching
element of the boost converter, the boost section provides
a constant output power independent of the input supply.
The H-Bridge section of the TK6593x switches the high
voltage output of the boost converter to the two terminals
of the EL Lamp. By alternately switching the terminals of
the lamp between the high voltage supply and ground, the
peak-to-peak voltage developed across the lamp is
effectively twice the high voltage generated by boost
converter. Furthermore, the TK6593x limits the magnitude
of the drive currents through the H-Bridge switches in
order to minimize the edge rates developed across the EL
Lamp. This approach protects the EL Panel from large
current spikes and reduces the likelihood of high frequency
noise components being injected into neighboring circuitry.
The Oscillator section of the TK6593x generates a fixed
frequency clock source for the previously described Boost
and H-Bridge sections, without the need for external
components. The high frequency output of the oscillator is
used for driving the boost controller. A lower frequency
CEL
20 nF
VCC
C1
100 nF
D1
EL +
HV
GND
IND
EL -
VCC
L1
330 H
ICONV
FIGURE 1: TYPICAL APPLICATION
Page 10
May 2000 TOKO, Inc.
TK6593x
With properly selected components, the TK6593x will
nominally support peak output voltages to 90 V
(180 V
PK-PK
). Should the EL Panel become disconnected
from the driver outputs, the removal of the load can cause
the output voltage to increase beyond 90 V. To protect
against this fault condition, a clamp circuit exists on the
high voltage output which nominally limits the output
voltage to a typical value of 105 V (210 V
PK-PK
).
THEORY OF OPERATION (CONT.)
DETAILS CONCERNING THE
H-BRIDGE SECTION OPERATION
In an effort to extend EL lamp life, reduce EMI emissions,
and reduce the power draw of the IC, current sources to
control the charging and discharging of the EL lamp panel
and special sequencing control of the H-bridge FETs were
added to the H-bridge of TK659xx.
Current sources were added between ground and the
sources of the low-side N-channel FETs (Figure 2).
Therefore, the current into and out of the EL panel is
controlled and limited.
The FETs are turned off and on in the sequence shown in
Figure 3. As is noted in Figure 3, there is a period of time
when both of lower N-channel FETs are turned on and both
of upper P-channel FETs are turned off. This provides a
period of time to discharge the EL panel capacitance
completely;
before starting to recharge it again with current
from HV voltage rail. Therefore, this special sequencing
method prevents taking current off the HV voltage rail
during the discharge of EL panel capacitance and operates
more efficiently.
HV
HVP
HVP
UL
UR
EL Panel
LL
LR
Current Source 1
Current Source 2
EL-
EL+
FIGURE 2: H-BRIDGE SCHEMATIC
ON
ON
ON
ON
ON
UL
UR
LL
LR
VEL+
VEL =
VEL-
OFF
OFF
OFF
OFF
BOTH OFF
OFF
ON
OFF
ON
ON
BOTH ON
Discharging
EL Panel
Capacitance
VEL+ VEL-
-
OFF
OFF
FIGURE 3: H-BRIDGE SEQUENCING WAVEFORMS
May 2000 TOKO, Inc.
Page 11
TK6593x
SUPPLY PIN (V
CC
)
This pin is the positive input supply for the TK6593x. Good design practices dictate capacitive decoupling to the ground
pin.
GROUND PIN (GND)
The pin provides the ground connection for the IC.
IND PIN
This pin is periodically pulled to ground by a power transistor acting as an internal switch to the TK6593x. Externally, this
pin is typically connected to an inductor and a rectifying diode. By modulating the switching action of the internal switch,
the TK6593x can boost the relatively low voltage of the battery to the high voltage required to drive the EL Lamp.
HV PIN
This pin is connected to the filter capacitor and the cathode of the rectifying diode in order to generate a high voltage
supply. This high voltage supply is switched to the terminals of the EL Lamp through the H-Bridge.
EL
+
PIN
This pin is connected to one side of the EL Panel.
EL
-
PIN
This pin is connected to the other side of the EL Panel.
Note: Measuring the voltage across the EL lamp (EL
+
pin to EL
-
pin) should be done with balanced scope probes using
differential measurement techniques to obtain a true waveform of the voltage across the EL lamp.
PIN DESCRIPTIONS
Page 12
May 2000 TOKO, Inc.
TK6593x
DESIGN CONSIDERATIONS
INDUCTOR VALUE SELECTION
Designing an EL Driver utilizing the TK6593x is a very simple task. The primary component affecting the behavior of the
converter is the inductor. Essentially, the entire design task primarily consists of selecting the proper inductor value and
type given the operating conditions of the EL Panel (e.g., lamp capacitance, frequency, output voltage, supply range).
The following tables and charts are intended to simplify the selection of the inductor.
Given the capacitance of the EL Lamp, and the peak output voltage requirements, the following table can be utilized to
select the value of the inductive component.
TABLE 4: PEAK OUTPUT VOLTAGE VS. INDUCTOR VALUE AND LAMP CAPACITANCE
As an example as to how the above table is to be used, assume that we have a 4-square-inch panel (30 nF capacitance)
and we would like the peak-to-peak voltage across the lamp to be 140 V. The peak voltage on either terminal would be
70 V (140 V / 2). Referring to the table above, we can see that using a 470
H coil the peak voltage developed across
a 30 nF Lamp would be approximately 69 V. In this particular example, the inductive component should have a value of
470
H.
INDUCTOR TYPE SELECTION
After the value of the inductor has been selected, an appropriate coil type needs to be selected taking into account such
factors as DC resistance and current capability. The following charts can be utilized for selecting the proper family of Toko
Coils. Furthermore, the following charts will also indicate if the TK6593x is the appropriate driver given the frequency and
input supply requirements. The following charts will indicate whether or not the TK6593x has sufficient drive capability,
INDUCTOR
VALUE
15.0 nF
LAMP
20.0 nF
LAMP
25.0 nF
LAMP
30.0 nF
LAMP
35.0 nF
LAMP
40.0 nF
LAMP
45.0 nF
LAMP
100 H
45 V
39 V
35 V
32 V
29 V
27 V
26 V
120 H
49 V
43 V
38 V
35 V
32 V
30 V
28 V
150 H
55 V
48 V
43 V
39 V
36 V
34 V
32 V
180 H
60 V
52 V
47 V
43 V
39 V
37 V
35 V
220 H
66 V
58 V
51 V
47 V
44 V
41 V
38 V
270 H
74 V
64 V
57 V
52 V
48 V
45 V
43 V
330 H
81 V
70 V
63 V
58 V
53 V
50 V
47 V
390 H
88 V
77 V
69 V
63 V
58 V
54 V
51 V
470 H
84 V
75 V
69 V
64 V
59 V
56 V
560 H
82 V
75 V
69 V
65 V
61 V
680 H
83 V
76 V
72 V
67 V
820 H
84 V
79 V
74 V
1000 H
87 V
82 V
Note: The voltages indicated in the table above may not be achievable under certain circumstances (i.e., low battery or higher drive frequencies).
Refer to the charts on page 12 to determine which output voltage/coil combination can be supported by the EL driver.
Close to 100 V operation check capacitor C
1
voltage rating
May 2000 TOKO, Inc.
Page 13
TK6593x
given the input supply and frequency requirements. A high-current solution for driving larger panels is currently under
development. To utilize the following charts in selecting an appropriate coil, perform the following steps:
1) From the following charts, select the chart that matches the part number of the Toko EL Driver that will be used in
the application. The part number of the Toko EL Driver will be dependant upon the desired frequency of the EL panel
(e.g., TK65931 = 200Hz).
2) Determine input supply voltage range (e.g., 4 to 6 V). The x-axis of the following charts represent the minimum
expected supply voltage. Below this minimum supply voltage the EL Driver output may begin to droop. On the
appropriate chart, draw a vertical line upward from the minimum supply voltage represented on the x-axis (e.g., 4V).
3) Draw a horizontal line passing through the chosen inductor value on the y-axis (e.g., 470
H).
4) The vertical and horizontal lines drawn in steps 2 and 3 respectively will intersect at a point. This point will lie in one
of four regions of the chart (e.g., D52FU). These four regions suggest which family of Toko Coils to use.
Of the three coil families suggested in these charts, the D31FU has the smallest physical size but also has higher DC
resistance. The D52FU series of coils has the largest physical size and the lowest DC resistance. The D52FU or the
D32FU can be used as a reasonable substitute for the D31FU. Similarly, the D52FU can be used as a replacement for
the D32FU. Substituting a coil with lower DC resistance will generally result in a system that will consume less power
supply current.
DESIGN CONSIDERATIONS (CONT.)
TK65930, TK65931
INDUCTOR

VALUE

(
H)
820
270
(NOTE 1)
560
390
180
D31FU
D32FU
D52FU
X
330
220
470
680
1000
MINIMUM SUPPLY (V)
3 4 5 6
100
TK65932, TK65933
INDUCTOR VALUE (H)
820
270
(NOTE 1)
560
390
180
D31FU
D32FU
D52FU
330
220
470
680
1000
MINIMUM SUPPLY (V)
3 4 5 6
100
TK65934, TK65935
INDUCTOR

VALUE

(
H) 820
270
(NOTE 1)
560
390
180
D31FU
D32FU
D52FU
330
220
470
680
1000
MINIMUM SUPPLY (V)
3 4 5 6
100
TK65936, TK65937
INDUCTOR

VALUE

(
H)
820
270
(NOTE 1)
560
390
180
D31FU
D32FU
D52FU
330
220
470
680
1000
MINIMUM SUPPLY (V)
3 4 5 6
100
TK65938, TK65939
INDUCTOR

VALUE

(
H) 820
270
(NOTE 1)
560
390
180
D31FU
D32FU
D52FU
330
220
470
680
1000
MINIMUM SUPPLY (V)
3 4 5 6
100
Note 1: A high-current solution for driving
larger panels is currently under development.
Page 14
May 2000 TOKO, Inc.
TK6593x
NOISE CONSIDERATIONS
There are two specific noise types relevant to the user when it comes to choosing EL Drivers: the Audio Noise and the
Electromagnetic Interference (EMI) Noise.
The EMI Noise would most likely come from the boost converter section of the EL Driver circuit. The Toko EL Driver has
specifically been designed to address this issue.
The device runs at a fixed frequency and the frequency is controlled tightly in order to avoid interference.
Furthermore, the panel frequency is forced to be a 128 submultiple of the boost frequency avoiding any type of beating
frequencies.
By choosing shielded coils, the EMI noise problem can further be reduced.
The Audio Noise can come from several components which make up the system.
The coil, if operated in the audio range would be a source of noise. The Toko EL Driver was carefully designed to give
the user the choice of 10 frequencies such that the coil frequency will always be above audio range. Since the device
operates at a fixed frequency in discontinuous conduction mode, there are no possible submultiples which would cause
audible noise.
The filter capacitor can be a source of audio noise. Furthermore, depending on how this cap is mounted, the mounting
can act as an amplifier (as a speaker box). Certain ceramic caps driven from a high voltage source as in the EL Driver
case, demonstrate a PIEZOELECTRIC effect which is distinguishable in the Audio Range.
Other types of caps, such as film type do not denote an audio noise.
The panel itself, being operated well into the Audio Range (175 Hz to 400 Hz) and of a capacitive nature driven from high
voltage may also display Audible Noise. Mounting of this panel can enhance or diminish this natural effect of the panel.
APPLICATION INFORMATION
FIGURE 4: INTENSITY CONTROL APPLICATION
CEL
20 nF
C1
100 nF
D1
EL +
HV
GND
IND
EL -
VCC
L1
Vpower
1.8 to 7 V
R1
1.5 k
R2
3 k
3 V PWM
10% to 90%
200 KHz to 300 KHz
~ 1 mA sink
3 V ~ 1 mA source
R1 = 1.5 k
R2 = 3.0 k
C2 = 10 nF
C2
10 nF
EL LAMP INTENSITY CONTROL APPLICATION
In driving EL lamp panels, it is sometimes desirable to be able to adjust the intensity of the EL lamp. The TK6593x can
be used in such an application. By reducing the voltage supplied to the V
CC
pin of the TK6593x, one can reduce the peak
current regulation point of the IC. This translates into a reduction in the peak to peak output voltage across the EL panel,
which reduces the intensity of the light being emitted from the EL lamp.
By decreasing the input voltage to the V
CC
pin from 2.9 V to 2.1 V, the peak current regulation point will be reduced about
53 mA. This correlates to about a 2/3 reduction in the peak to peak voltage appearing across the EL lamp panel.
The V
CC
pin only takes 200
A max. when the EL driver is in operation. Therefore, it can normally be controlled by logic
power level signals. One way of accomplishing this with two digital logic signals is shown in Figure 4.
May 2000 TOKO, Inc.
Page 15
TK6593x
LAYOUT
Actual Size
2x
SPLIT SUPPLY LAYOUT
Actual Size
2x
Page 16
May 2000 TOKO, Inc.
TK6593x
Marking Information
Marking
TK65930
C0
TK65931
C1
TK65932
C2
TK65933
C3
TK65934
C4
TK65935
C5
TK65936
C6
TK65937
C7
TK65938
C8
TK65939
C9
0.95
0.95
0.32
M
0.1
+0.15
- 0.05
3.5
1.2
0.15
0.3
3.3
2.2
0.4
0.95
0.95
3.0
e
e
e1
0.6
1.0
Recommended Mount Pad
1
2
3
6
0 - 0.1
15 max
1.4 max
Marking
+0.3
- 0.1
+ 0.3
(3.4)
+0.15
- 0.05
Dimensions are shown in millimeters
Tolerance: x.x =
0.2 mm (unless otherwise specified)
M
0.1
+0.15
- 0.05
0.4
5 PL
e
e
SOT23L-6
PACKAGE OUTLINE
Printed in the USA
1999 Toko, Inc.
All Rights Reserved
TOKO AMERICA REGIONAL OFFICES
Toko America, Inc. Headquarters
1250 Feehanville Drive, Mount Prospect, Illinois 60056
Tel: (847) 297-0070 Fax: (847) 699-7864
IC-xxx-TK6593x
0798O0.0K
Visit our Internet site at http://www.tokoam.com
The information furnished by TOKO, Inc. is believed to be accurate and reliable. However, TOKO reserves the right to make changes or improvements in the design, specification or manufacture of its
products without further notice. TOKO does not assume any liability arising from the application or use of any product or circuit described herein, nor for any infringements of patents or other rights of
third parties which may result from the use of its products. No license is granted by implication or otherwise under any patent or patent rights of TOKO, Inc.
Western Regional Office
Toko America, Inc.
2480 North First Street , Suite 260
San Jose, CA 95131
Tel: (408) 432-8281
Fax: (408) 943-9790
Midwest Regional Office
Toko America, Inc.
1250 Feehanville Drive
Mount Prospect, IL 60056
Tel: (847) 297-0070
Fax: (847) 699-7864
Eastern Regional Office
Toko America, Inc.
107 Mill Plain Road
Danbury, CT 06811
Tel: (203) 748-6871
Fax: (203) 797-1223
Semiconductor Technical Support
Toko Design Center
4755 Forge Road
Colorado Springs, CO 80907
Tel: (719) 528-2200
Fax: (719) 528-2375