Supertex inc. HV833DB1 High Voltage EL Lamp Driver Demoboard General Description The Supertex HV833DB1 demoboard 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 Parameter Value Input voltage 1.8 to 6.5V Supply current 45mA Lamp size range 5.5in2 to 10in2 Lamp frequency 250Hz Converter frequency 70kHz Board Layout and Connections VB VDD ON OFF EN VIN EL Lamp CS HV833 REL 1.8 - 6.5V Rsw DIODE VA CDD GND LX CIN Connections: EN - Enable Input VIN - Inductor Supply Enables/Disables the lamp driver. A logic high (VDD) enables the driver and a logic low (GND) disables the driver. This input may be connected to a mechanical switch, or to a logic circuit output that has a source impedance of less than 20KΩ. Supplies the high voltage power converter. VDD - IC Supply Supplies the HV833 EL driver IC. The supplied circuit is optimized for 1.8 to 6.5 volt operation. Doc.# DSDB-HV833DB1 B032114 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. VA and VB - Lamp Connections Connect to an EL lamp. Polarity is irrelevant. Supertex inc. www.supertex.com HV833DB1 Figure1: HV833DB1 Circuit Schematic Enable ON = VDD OFF = 0V + 0.1µF VDD 680kΩ 2.0MΩ - 1 VDD VA 8 2 RSW-Osc VB 7 3 REL-Osc CS GND LX 5 4 + HV833 4.7µF VIN EL Lamp 6 1N4148 LX 220µH - CS 10nF 100V Typical Performance The specific external components used in the above circuit are: L =220µH Murata (LQH43MN221K01), CS = 10nF 100V 2 X NPO. The following was observed when driving a 10in Green lamp. Lamp Brightness VIN (V) IIN (mA) VCS (V) fEL (Hz) ft-lm cd/m2 2.0 31.1 49.7 232 1.4 4.7 3.0 41.5 67.8 232 3.4 11.5 4.0 34.0 77.2 232 4.3 14.7 5.0 27.7 81.5 232 4.5 15.5 6.0 24.4 84.3 232 4.7 16.0 6.5 24.2 85.3 232 4.8 16.3 2 The following was observed when driving a 5.5in Green lamp Lamp Brightness VIN (V) IIN (mA) VCS (V) fEL (Hz) ft-lm cd/m2 1.8 26.1 56.3 232 2.3 7.9 2.0 29.1 61.9 232 3.0 10.3 3.0 25.2 78.2 232 4.9 16.8 4.0 18.5 82.7 232 5.2 17.8 5.0 14.7 84.6 232 5.2 17.5 6.0 13.5 85.4 232 5.3 18.1 6.5 12.0 86.9 232 5.4 18.5 Supertex inc. does not recommend the use of its products in life support applications, and will not knowingly sell them for use in such applications unless it receives an adequate “product liability indemnification insurance agreement.” Supertex inc. does not assume responsibility for use of devices described, and limits its liability to the replacement of the devices determined defective due to workmanship. No responsibility is assumed for possible omissions and inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications refer to the Supertex inc. (website: http//www.supertex.com) Supertex inc. ©2014 Supertex inc. All rights reserved. Unauthorized use or reproduction is prohibited. Doc.# DSDB-HV833DB1 B032114 2 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com