Supertex inc. HV859DB1 EL Lamp Driver Demoboard General Description The Supertex HV859DB1 demoboard contains all the necessary circuitry needed to demonstrate the features of the HV859 EL lamp driver. Simply connect it to a power supply and an EL lamp. For additional assistance in designing EL driver circuits, please refer to application notes AN-H33 (the effect of external components on performance of Supertex EL drivers) and AN-H43 (EL lamp driver circuits to reduce audible lamp noise). Specifications Parameter Value Input voltage: 1.8 to 5.0V Typical supply current: 25mA Lamp size range: up to 5.0in2 Lamp frequency: 204Hz Converter frequency: 80kHz Board Layout and Connection Diagram VDD CDD RSW HV859 REL EN VA VB CIN CS GND VIN LX D Actual Dimensions = 12mm x 12mm Connections: EN - Enable Input Enables/Disables the lamp driver. A logic high (connect to VDD) enables the driver, and a logic low (connect to GND), disables the driver. This input can be connected to a mechanical switch, or to a logic circuit output that has a source impedance of less than 20kΩ. VDD - IC Supply Supplies the HV859 EL driver IC. The supplied circuit is optimized for 3.0V operation. The operating range can be from 1.8V to 5.0V. Connect to the positive terminal of a power supply. VIN - Inductor Supply Supplies the high voltage power converter. Connect to the positive terminal of a power supply. GND - Circuit Ground Connect to the VDD and VIN negative terminals. Supply bypass capacitors for both VDD and VIN are provided on the demo board. External supply bypass capacitors are not required. VA and VB - Lamp Connections Connect to an EL lamp. Polarity is irrelevant. Note: Make sure all the above connections are made before powering up the supply voltages. Doc.# DSDB-HV859DB1 A032813 Supertex inc. www.supertex.com HV859DB1 Circuit Schematic ON = VDD OFF = 0V Enable Signal 1 RSW = 560kΩ CDD 0.1µF + VDD 2 3 - REL = 2.0MΩ 4 VDD VA RSW-Osc VB REL-Osc CS GND LX CIN 4.7µF 7 EL Lamp 6 BAS21 5 CS 3.3nF 100V LX 220µH* HV859 + VIN - 8 Notes: Tie VDD and VIN together if split supplies are not used. * Murata Inductor LQH32CN221K21 The above circuit may be optimized further based on specification of the lamp used. Typical Performance The specific external components used in the above circuit are Lx = 220µH Murata (LQH32CN221K21), CS = 3.3nF 200V NPO. Lamp Size (in ) 2 VDD = VIN (V) IIN VCS Brightness fEL (mA) (VPEAK) (Hz) ft-lm cd/m2 3.0 1.8 25.4 102 204 3.74 12.8 3.0 2.0 25.5 104 204 4.70 16.1 3.0 3.0 26.1 106 204 7.57 25.9 3.0 4.0 20.6 109 204 8.45 28.9 3.0 5.0 17.0 112 204 8.87 30.3 Bill of Materials Component Description Package Manufacturer Part # LX 220µH inductor --- Murata LQH32CN221K21 CS 3.3nF, 200V, NPO chip capacitor 1206 Tecate Industries CMC-200/332JN1206T RSW 1%, 562kΩ resistor 0603 Any --- REL 1%, 2MΩ resistor 0603 Any --- CIN 4.7µF, 10V ceramic chip capacitor 0805 Any --- CDD 0.1µF, 16V ceramic chip capacitor 0603 Any --- Diode 250V fast recovery diode SOT-23 Diodes Inc BAS21 U1 EL driver IC 8-Lead MSOP Supertex Inc HV859MG 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. ©2013 Supertex inc. All rights reserved. Unauthorized use or reproduction is prohibited. Doc.# DSDB-HV859DB1 A032813 2 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com