tk65933 Crystalfontz America, Inc.,, tk65933 Datasheet

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tk65933

Manufacturer Part Number
tk65933
Description
Large El Lamp Driver Features
Manufacturer
Crystalfontz America, Inc.,
Datasheet
1.TK65933.pdf (16 pages)
February 2001 TOKO, Inc.
FEATURES
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.
LAMP FREQUENCY CODE
TK65930
TK65931*
TK65932
TK65933*
TK65934
High Ratio of Brightness / Input Power
Constant Brightness Versus Input Supply Changes
Optimized for 15 nf to 45 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)
Intensity Control Application (Refer to Application
Information)
175 Hz
200 Hz
225 Hz
250 Hz
275 Hz
ORDERING INFORMATION
TK65935*
TK65936
TK65937*
TK65938
TK65939*
TK6593 MTL
300 Hz
325 Hz
350 Hz
375 Hz
400 Hz
* Consult factory for availability
of other frequencies.
Lamp Frequency Code
TAPE/REEL CODE
TL: Tape Left
APPLICATIONS
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.
V CC
Battery Powered Systems
Cellular Telephones
Pagers
LCD Modules
Wrist Watches
Consumer Electronics
BLOCK DIAGRAM
LARGE EL LAMP DRIVER
OSCILLATOR
TK6593xM
HV BOOST
CONTROL
EL +
HV
EL -
BRIDGE
H
TK6593xM
V CC
GND
IND
Page 1
IND
GND
EL +
EL -
HV

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tk65933 Summary of contents

Page 1

... ORDERING INFORMATION TK6593 MTL LAMP FREQUENCY CODE TK65930 175 Hz TK65935* 300 Hz TK65931* 200 Hz TK65936 325 Hz TK65932 225 Hz TK65937* 350 Hz TK65933* 250 Hz TK65938 375 Hz TK65934 275 Hz TK65939* 400 Hz February 2001 TOKO, Inc. APPLICATIONS Battery Powered Systems Cellular Telephones Pagers LCD Modules Wrist Watches ...

Page 2

TK6593xM ABSOLUTE MAXIMUM RATINGS V Pin .................................................................... 6 All Pins Except V and GND ............................... V CC Power Dissipation (Note 1) ................................. 600 mW TK6593x ELECTRICAL CHARACTERISTICS °C, unless ...

Page 3

... TOKO PART NO. TK65930 TK65931 TK65932 TK65933 TK65934 TK65935 TK65936 TK65937 TK65938 TK65939 TABLE 3: CONVERTER SUPPLY CURRENT TOKO PART NO. TK65930 TK65931 TK65932 TK65933 TK65934 TK65935 TK65936 TK65937 TK65938 TK65939 February 2001 TOKO, Inc. MIN. TYP. 157 Hz 175 Hz 180 Hz 200 Hz 202 Hz 225 Hz 225 Hz ...

Page 4

TK6593xM TYPICAL PERFORMANCE CHARACTERISTICS TK65931 Voltage Waveform TK65931 PEAK TO PEAK LAMP VOLTAGE vs. SUPPLY VOLTAGE 150 L = 330 µH 140 1 130 220 µH 120 110 100 2.5 3 3 (V) ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.) TK65931 AVERAGE CONVERTER SUPPLY CURRENT vs. SUPPLY VOLTAGE 2.5 3 3 (V) TK65931 PEAK CURRENT THRESHOLD vs. SUPPLY VOLTAGE 110 100 ...

Page 6

TK6593xM TYPICAL PERFORMANCE CHARACTERISTICS (CONT.) TK65931 PEAK TO PEAK LAMP VOLTAGE vs. TEMPERATURE 160 150 3.6 V 140 130 2.7 V 120 110 100 90 -50 - TEMPERATURE ( C) TK65931 LAMP ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.) TK65931 PEAK CURRENT THRESHOLD vs. TEMPERATURE 110 100 2 -50 - TEMPERATURE ( C) TK65931 QUIESCENT CURRENT vs. TEMPERATURE 100 ...

Page 8

TK6593xM TYPICAL PERFORMANCE CHARACTERISTICS (CONT.) TK65931 MAXIMUM DUTY CYCLE vs. SUPPLY VOLTAGE 2.5 3 3 (V) TK65931 MAXIMUM DUTY CYCLE vs. TEMPERATURE -50 -25 ...

Page 9

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 ...

Page 10

TK6593xM THEORY OF OPERATION (CONT.) With properly selected components, the TK6593x will nominally support peak output voltages (180 V ). Should the EL Panel become disconnected PK-PK from the driver outputs, the removal of the load can ...

Page 11

SUPPLY PIN ( 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 ...

Page 12

TK6593xM 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 ...

Page 13

... D52FU 470 390 D32FU 330 270 220 D31FU 180 100 MINIMUM SUPPLY (V) February 2001 TOKO, Inc. DESIGN CONSIDERATIONS (CONT.) TK65932, TK65933 1000 (NOTE 1) 820 680 560 470 390 330 270 220 D31FU 180 100 MINIMUM SUPPLY (V) TK65938, TK65939 ...

Page 14

TK6593xM EL LAMP INTENSITY CONTROL APPLICATION In driving EL lamp panels 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 ...

Page 15

February 2001 TOKO, Inc. LAYOUT 2x SPLIT SUPPLY LAYOUT 2x TK6593xM Actual Size Actual Size Page 15 ...

Page 16

... North First Street , Suite 260 San Jose, CA 95131 Tel: (408) 432-8281 Fax: (408) 943-9790 IC-xxx-TK6593x 0798O0.0K Marking Information Marking TK65930 TK65931 TK65932 TK65933 TK65934 TK65935 TK65936 TK65937 TK65938 TK65939 0.4 Fax: (847) 699-7864 Semiconductor Technical Support Toko Design Center 4755 Forge Road ...

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