TK65910MTL/A0 TOKO [TOKO, Inc], TK65910MTL/A0 Datasheet

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TK65910MTL/A0

Manufacturer Part Number
TK65910MTL/A0
Description
SMALL EL LAMP DRIVER
Manufacturer
TOKO [TOKO, Inc]
Datasheet
1.TK65910MTLA0.pdf (20 pages)
May 2000 TOKO, Inc.
FEATURES
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.
The proprietary architecture (detailed in the Theory of
Operation section) of the TK6591x 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
TK65910
TK65911*
TK65912
TK65913*
TK65914
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
175 Hz
200 Hz
225 Hz
250 Hz
275 Hz
ORDERING INFORMATION
TK65915*
TK65916
TK65917*
TK65918
TK65919*
TK6591 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 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.
V CC
Battery Powered Systems
Cellular Telephones
Pagers
LCD Modules
Wrist Watches
Consumer Electronics
BLOCK DIAGRAM
SMALL EL LAMP DRIVER
OSCILLATOR
HV BOOST
CONTROL
TK6591x
EL +
HV
EL -
BRIDGE
H
TK6591x
V CC
GND
IND
Page 1
IND
GND
EL +
EL -
HV

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TK65910MTL/A0 Summary of contents

Page 1

FEATURES High Ratio of Brightness / Input Power Constant Brightness Versus Input Supply Changes Optimized for 3 12.5 nf Panel Capacitance Panel Voltage Slew Rates Controlled for Life Enhancement Panel Peak to Peak Voltage Independent of Input Voltage ...

Page 2

TK6591x ABSOLUTE MAXIMUM RATINGS V Pin .................................................................... 6 All Pins Except V and GND ............................... V CC Power Dissipation (Note 1) ................................ 600 mW TK6591x ELECTRICAL CHARACTERISTICS unless ...

Page 3

TK6591x ELECTRICAL CHARACTERISTICS unless otherwise specified TABLE 1: LAMP FREQUENCY TOKO PART NO. TK65910 TK65911 TK65912 TK65913 TK65914 TK65915 TK65916 TK65917 TK65918 TK65919 TABLE 2: OSCILLATOR FREQUENCY ...

Page 4

TK6591x TYPICAL PERFORMANCE CHARACTERISTICS TK65911 Voltage Waveform Across 5 nF Lamp TK65911 PEAK TO PEAK LAMP VOLTAGE vs. SUPPLY VOLTAGE 150 820 µH 140 130 680 µH 120 110 100 2.5 3 3.5 4 ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.) TK65911 AVERAGE CONVERTER SUPPLY CURRENT vs. SUPPLY VOLTAGE 2 (V) TK65911 PEAK CURRENT THRESHOLD vs. SUPPLY VOLTAGE ...

Page 6

TK6591x TYPICAL PERFORMANCE CHARACTERISTICS (CONT.) TK65911 PEAK TO PEAK LAMP VOLTAGE vs. TEMPERATURE 140 130 120 110 100 90 -50 - TEMPERATURE ( C) TK65911 LAMP FREQUENCY vs. TEMPERATURE 220 210 200 190 ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.) TK65911 PEAK CURRENT THRESHOLD vs. TEMPERATURE 2 -50 - TEMPERATURE( C) TK65911 QUIESCENT CURRENT vs. TEMPERATURE 100 ...

Page 8

TK6591x TYPICAL PERFORMANCE CHARACTERISTICS (CONT.) TK65911 MAXIMUM DUTY CYCLE vs. SUPPLY VOLTAGE 2.5 3 3 (V) TK65911 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

TK6591x THEORY OF OPERATION (CONT.) With properly selected components, the TK6591x 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 TK6591x. 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

TK6591x INDUCTOR VALUE SELECTION Designing an EL Driver utilizing the TK6591x 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

TK6592x family of EL Drivers which have higher drive capabilities. To utilize the following charts in selecting an appropriate coil, perform the following steps: 1) From the following charts, select the chart that ...

Page 14

TK6591x LOW VOLTAGE SPLIT SUPPLY APPLICATION The split power supply application of this EL driver circuit configuration (see Figure 4) in which the separated or split away from the main power input (V ...

Page 15

APPLICATION INFORMATION (CONT.) TABLE 5: INDUCTANCE SELECTION TABLE FOR SINGLE AND DUAL CELL ALKALINE SYSTEMS PART NO. TK65910 TK65911 f lamp 175 Hz 200 Hz f converter 22.4 kHz 25.6 kHz min.Vp L type D31FU 330 µH 270 µH 0.9V ...

Page 16

TK6591x Page 16 LAYOUT 2x SPLIT SUPPLY LAYOUT 2x Actual Size Actual Size May 2000 TOKO, Inc. ...

Page 17

May 2000 TOKO, Inc. NOTES TK6591x Page 17 ...

Page 18

TK6591x Page 18 NOTES May 2000 TOKO, Inc. ...

Page 19

May 2000 TOKO, Inc. NOTES TK6591x Page 19 ...

Page 20

TK6591x SOT23L-6 +0.15 0.4 - 0.05 0.1 6 Marking +0.15 - 0.05 0. 0.95 0.95 +0.3 - 0.1 3.5 (3.4) Dimensions are shown in millimeters Tolerance: x.x = 0.2 mm (unless otherwise specified) ...

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