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| HV833DB1 HV833DB1 EL Lamp Driver Introduction The Supertex HV833DB1 demo board contains all necessary circuitry to demonstrate the features of the HV833 EL lamp driver. Simply connect it to a power supply and a lamp as shown below. For additional assistance in designing EL driver circuits, please refer to application notes AN-H33 (effect of external components on performance of Supertex EL drivers) and AN-H45 (EL lamp driver circuits to reduce lamp audible noise). Specifications Input Voltage Supply Current Lamp Size Range Lamp Frequency Converter frequency 2 1.8V to 6.5V 45mA 5.5in and 10in2 250Hz 70KHz Board Layout and Connections VB VDD ON 1.8 - 6.5V OFF VIN GND CIN CDD EN REL Rsw CS HV833 DIODE EL Lamp VA LX EN Enable Input Enables/Disables the lamp driver. A logic high (VDD) enables the driver and a logic low (GND) disables the driver. This in put may be connected to a mechanical switch, or to a logic circuit output that has a source impedance of less than 20K. GND Circuit Ground Connect to VDD and VIN negative terminals. Supply bypass capacitor for both VDD and VIN are provided on the demo board. External supply bypass capacitors are not necessary. VDD IC Supply Supplies the HV833 EL driver IC. The supplied circuit is optimized for 1.8 to 6.5 volt operations. VA and VB Lamp Connections Connects to an EL lamp. Polarity is irrelevant. VIN Inductor Supply Supplies the high voltage power converter. 05/02/02 Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products liability indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined to be defective due to workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications, refer to the Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, refer to the most current databook or to the Legal/Disclaimer page on the Supertex website. 1 HV833DB1 HV833DB1 Schematic ON=VDD OFF=0V 680K 1 VDD 2 RSW-osc 0.1F 2.0M 3 REL-osc 4 GND VA 8 VB 7 CS 6 LX 5 Lx Cs 100V 1N4148 EL Lamp Enable VDD + - HV833MG VIN + 4.7F Inductor: Murata LQH43MN221K01 Typical Performance The specific external components used in the above circuit are: Lx=220mH Murata (LQH43MN221K01), Cs= 10nF 100V NPO. The following was observed when driving a 10in2 Green lamp. VIN(V) 2.0 3.0 4.0 5.0 6.0 6.5 IIN(mA) 31.1 41.5 34.0 27.7 24.4 24.2 VCS(V) 49.7 67.8 77.2 81.5 84.3 85.3 fEL(Hz) 232 232 232 232 232 232 Brightness ft-lm 1.4 3.4 4.3 4.5 4.7 4.8 cd/ m2 4.7 11.5 14.7 15.5 16.0 16.3 The following was observed when driving a 5.5in2 Green lamp. VIN(V) 1.8 2.0 3.0 4.0 5.0 6.0 6.5 IIN(mA) 26.1 29.1 25.2 18.5 14.7 13.5 12.0 VCS(V) 56.3 61.9 78.2 82.7 84.6 85.4 86.9 fEL(Hz) 232 232 232 232 232 232 232 Brightness ft-lm 2.3 3.0 4.9 5.2 5.2 5.3 5.4 cd/ m2 7.9 10.3 16.8 17.8 17.5 18.1 18.5 05/02/02rev.2 (c)2002 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited. 2 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 * FAX: (408) 222-4895 www.supertex.com |
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