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TK65937 Datasheet Preview

TK65937 Datasheet

LARGE EL LAMP DRIVER

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TK6593x
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)
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.
ORDERING INFORMATION
TK6593 MTL
Lamp Frequency Code
APPLICATIONS
s Battery Powered Systems
s Cellular Telephones
s Pagers
s LCD Modules
s Wrist Watches
s 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+ VCC
20P HV GND
EL- IND
BLOCK DIAGRAM
VCC
HV BOOST
CONTROL
OSCILLATOR
IND
GND
HV
LAMP FREQUENCY CODE
TK65930
175 Hz TK65935*
TK65931*
200 Hz TK65936
TK65932
225 Hz TK65937*
TK65933*
250 Hz TK65938
TK65934
275 Hz TK65939*
300 Hz
325 Hz
350 Hz
375 Hz
400 Hz
TAPE/REEL CODE
TL: Tape Left
* Consult factory for availability
of other frequencies.
H
BRIDGE
EL+
EL-
May 2000 TOKO, Inc.
Page 1




TOKO

TK65937 Datasheet Preview

TK65937 Datasheet

LARGE EL LAMP DRIVER

No Preview Available !

TK6593x
ABSOLUTE MAXIMUM RATINGS
VCC Pin .................................................................... 6.5 V
All Pins Except VCC and GND ............................... VCLAMP
Power Dissipation (Note 1) ................................ 600 mW
Storage Temperature Range ................... -55 to +150 °C
Operating Temperature Range ...................-30 to +80 °C
Junction Temperature ........................................... 150 °C
TK6593x ELECTRICAL CHARACTERISTICS
VCC = 3.6 V, TA = Tj = 25 °C, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNITS
V Input Supply Range
CC
2.7 3.6
6
V
IQ Quiescent Current
Current into pin 6
200 µA
IPEAK Peak Current Threshold (Note 4)
87 97 107 mA
FLAMP
Lamp Frequency
See Table 1
Hz
F
BOOST
Boost Frequency
See Table 2
kHz
VCLAMP
Boost Clamp Voltage
Force 100 µA into HV pin
90 105 120 V
D(MAX)
Maximum Duty Cycle
88 92 96 %
VOUT
Peak to Peak Lamp Voltage
(Note 3)
125 140 155
V
I
CONV
Converter Supply Current
(Notes 2, 3)
See Table 3
mA
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.
TEST CIRCUIT
CEL
20 nF
EL +
HV
EL -
C1
100 nF
D1
VCC
GND
IND
ICONV
VCC
L1
330 µH
Note: L1 = Toko Low Profile D52FU Series: 875FU-331 M
D1 = DIODES INC. DL4148
C1 = AVX 12061C104KAT2A
Page 2
May 2000 TOKO, Inc.


Part Number TK65937
Description LARGE EL LAMP DRIVER
Maker TOKO
Total Page 16 Pages
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