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TK65937M Datasheet(PDF) 1 Page - TOKO, Inc

Part # TK65937M
Description  LARGE EL LAMP DRIVER
Download  16 Pages
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Manufacturer  TOKO [TOKO, Inc]
Direct Link  http://www.toko.com
Logo TOKO - TOKO, Inc

TK65937M Datasheet(HTML) 1 Page - TOKO, Inc

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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)


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