Supertex inc. HV853DB1 High Voltage, Low Noise, Inductorless EL Lamp Driver Demoboard General Description Specifications The Supertex HV853DB1 demoboard contains all the necessary circuitry to demonstrate the features of the HV853 EL lamp driver. The HV853 is the low noise version of the EL driver HV852 with improved EMI performance. Simply connect it to a power supply and a lamp as shown in Figure 1. For additional assistance with the HV853 demoboard circuit, please refer to the HV853 datasheet. Parameter Value Input voltage: 3.2V to 5.0V Supply current: 18mA Lamp size: 0.93in2 and 1.5in2 Lamp frequency: 274Hz Board Layout and Connection Diagram VDD VA EN VB CLKIN CLKEN GND Actual Dimensions: 13mm x 8mm Connections: VDD (IC Supply) Supplies the HV853 EL driver IC. The supplied demoboard is optimized for 3.2 to 5.0V operation. EN (Enable Input) A logic input which enables/disables the driver. Connect EN to logic high (VDD) to enable the driver and to logic low (GND) to disable the driver. This input may be connected to a mechanical switch or to a logic circuit output. CLKIN (Clock Input) A logic input pin to which an external clock can be applied to set the EL lamp frequency. CLKEN has to be connected to VDD when external clock input is used. Also, the REL resistor needs to be removed and the REL pin needs to be connected to ground. Connect CLKIN to GND if not used. GND (Circuit Ground) Connect to VDD negative terminal. Supply bypass capacitor for VDD is provided on the demoboard. External supply bypass capacitors are not required. VA and VB (Lamp Connections) They connect to EL lamp terminals. Polarity is irrelevant. CLKEN (Clock Enable) Logic input pin which enables/disables the external clock applied. Logic high (VDD) will cause the EL lamp frequency to be set by the CLKIN input. Logic low (GND) will cause the EL lamp frequency to be set by the external REL resistor. Note: All of the above connections must be made before powering up the supply voltages. Doc.# DSDB-HV853DB1 A032813 Supertex inc. www.supertex.com HV853DB1 Figure 1: Test Circuit VDD = ON GND = OFF 1 REL + VDD CDD - 2 3 4 VDD REL HV853 VA VB EN GND CLKIN GND 5 NC CLKEN 10 EL Lamp 9 8 7 6 Test Circuit Data The specific external components used in the above circuit are: CDD = 2.2μF, 6.3V ceramic capacitor and REL = 1.6MΩ. The following was observed when driving a 0.93in2 green lamp and 1.5in2 green lamp. Lamp Size VDD IDD VPEAK Brightness fEL (V) (mA) 0.93 3.2 12.6 79 274 5.71 19.53 0.93 3.7 11.7 79 274 5.91 20.20 0.93 4.2 11.4 79 274 6.08 20.80 0.93 5.0 11.2 79 274 6.20 21.21 1.50 3.2 17.6 79 274 5.27 18.03 1.50 3.7 17.1 79 274 5.60 19.15 1.50 4.2 16.8 79 274 5.80 19.85 1.50 5.0 16.5 79 274 6.00 20.52 (in ) 2 (V) (Hz) ft-lm cd/m2 Bill of Materials Component Description Package Manufacturer Part Number REL 1%, 1.6MΩ chip resistor 0603 Any --- CDD 2.2μF, 6.3V ceramic chip capacitor 0603 Any --- U1 EL driver IC DFN-10 Supertex HV853K7-G Note: The above circuit may be optimized further based on specification of the lamp used. 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-HV853DB1 A032813 2 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com