Supertex inc. HV830DB1 EL Driver Demoboard General Description Specifications The HV830DB1 EL Driver demoboard contains all the circuitry necessary to drive an EL (Electroluminescent) lamp. Simply connect it to a power supply and a lamp as shown below. Parameter Value The supplied circuit has been optimized to drive an 8.0in2 lamp from a 3.0 to 3.3V supply. The circuit may be customized with different component values to suit a particular application. For assitance in designing EL driver circuits, please refer to Application Notes AN-H33 (EL Lamp Driver Circuits) and AN-H34 (HV823 & HV825 EL Lamp Driver Circuits). Lamp size range 3.0 to 12in2 Lamp frequency ~290Hz Converter frequency ~50KHz Supply voltage 3.0 to 3.3V Supply current 70mA Board Layout and Connections Enable Off connect together On CDD RSW REL CSW EN VA VDD VIN 3.0 - 3.3V GND 830 L CIN D CS VB EL Lamp HV830DB1 Connections: EN - Enable Input 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 as shown, or to a logic circuit output that has a source impedance of less than 20kΩ. VDD - IC Supply Supplies the HV830 EL driver IC. The supplied circuit is optimized for 3.0V to 3.3V operation. Current draw is typically 100µA when enabled and less than 1µA when disabled. Doc.# DSDB-HV830DB1 B032114 VIN - Inductor Supply Supplies the high voltage power converter. Current draw is approximately 50mA. GND - Circuit Ground Connect to VDD negative terminal. Supply bypass capacitors for both VDD and VIN are provided on the demoboard. An external supply bypass capacitor is not necessary. VA and VB - Lamp Connections Connect to EL lamp of 3 to 12 square inches. Polarity is irrelevant. Supertex inc. www.supertex.com HV830DB1 HV830DB1 Circuit Schematic Enable ON = VDD OFF = GND REL-Osc 3.0MΩ RSW-Osc 1.0MΩ VDD Note 1 VIN L 220µH CDD 100nF GND D BAS21 CIN 4.7µF CS 10nF REL RSW VA CS VB LX GND CSW 1.0nF EL Lamp HV830 Note: 1. Tie VDD and VIN together if split suppies are not used. CDD is not needed when a single supply is used. Modifiying the Supplied Circuit order of lamp size, along with supply voltages and component values. Find the circuit that most closely matches the desired application and change components as needed. For component locations, refer to the board layout and connection diagram at the begining of this note. The supplied circuit is optimized to drive an 8.0in2 green lamp from a 3.0 to 3.3V supply. To better suit other applications, the circuit may be modified by changing one or more of the components. The following table lists various applications in Lamp Size VDD Lamp1 Brightness Lamp Color Lamp Freq VDD = VIN (V) (mA) 22.3 Green 287 3.0 27.4 6.58 22.5 Green 287 3.1 26.3 3.5 6.61 22.6 Green 287 3.2 25.8 3.5 6.64 22.7 Green 287 3.3 25.3 5.0 6.75 23.1 Green 287 3.0 42.8 5.0 6.84 23.4 Green 287 3.1 41.7 5.0 6.90 23.6 Green 287 3.2 39.7 5.0 6.99 23.9 White 287 3.3 39.8 10.0 3.45 11.8 Pink 287 3.0 60.3 10.0 3.80 13.0 Pink 287 3.1 63.5 10.0 3.98 13.6 Pink 287 3.2 65.8 10.0 4.15 14.2 Pink 287 3.3 67.7 (in ) (ft-lm) (cd/m2) 3.5 6.52 3.5 2 (Hz) IIN Notes: 1. Lamp brightness can vary by type and manufacturer. 2. The recommended inductor is a Murata LQH4N series. Other inductors may be used, however, different inductor characteristics (especially series resistance) may result in overall circuit performance different from that listed. Please refer to Application Note AN-H33 for more information. 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-HV830DB1 B032114 2 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com