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TK65916MTL Datasheet(PDF) 1 Page - TOKO, Inc |
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TK65916MTL Datasheet(HTML) 1 Page - TOKO, Inc |
1 / 20 page May 2000 TOKO, Inc. Page 1 TK6591x 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. HV VCC EL+ IND GND HV BOOST CONTROL H BRIDGE OSCILLATOR EL- HV VCC IND EL- GND EL+ BLOCK DIAGRAM 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. TK6591x 20P ORDERING INFORMATION TAPE/REEL CODE TL: Tape Left Lamp Frequency Code TK6591 MTL LAMP FREQUENCY CODE TK65910 175 Hz TK65911* 200 Hz TK65912 225 Hz TK65913* 250 Hz TK65914 275 Hz TK65915* 300 Hz TK65916 325 Hz TK65917* 350 Hz TK65918 375 Hz TK65919* 400 Hz * Consult factory for availability of other frequencies. FEATURES s High Ratio of Brightness / Input Power s Constant Brightness Versus Input Supply Changes s Optimized for 3.5 nf to 12.5 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 Split Power Supply Application APPLICATIONS s Battery Powered Systems s Cellular Telephones s Pagers s LCD Modules s Wrist Watches s Consumer Electronics SMALL EL LAMP DRIVER |
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