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| HV852DB1 High Voltage, Low Noise, Inductorless EL Lamp Driver Demoboard General Description The Supertex HV852DB1 demo board contains all necessary circuitry to demonstrate the features of the HV852 EL lamp driver. Simply connect it to a power supply and a lamp, as shown below. For additional assistance in implementation of the HV852 circuit, please refer to the HV852 data sheet. Specifications Parameter Input Voltage Supply Current Lamp Size Lamp Frequency Value 2.4V to 5.0V 25mA 1.5in2 245Hz HV852DB1 Schematic and Board Layout VDD EN CLKIN GND REL CDD VA VB HV852DB1 HV852 CLKEN Actual Dimensions: 13mm x 8mm Connections: EN - Enable Input Enables/Disables the lamp driver. 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. VDD - IC Supply Supplies the HV852 EL driver IC. The supplied circuit is optimized for 2.4V to 5.0V operation. VA and VB - Lamp Connections Connects to an EL lamp. Polarity is irrelevant. GND - Circuit Ground Connect to VDD negative terminals. Supply bypass capacitor for VDD is provided on the demo board. External supply bypass capacitors are not necessary. CLKEN - Clock Enable To use external clock for setting the EL lamp frequency, this pin will need to be connected to VDD. To set the lamp frequency via REL, this pin will need to be connected to GND. CLKIN - Logic Input An external logic clock applied to this pin can be used to set the EL lamp frequency. When using external clock signal, REL will need to be removed, and REL pin will need to be connected to GND. CLKEN will need to be connected to VDD when an external clock signal is used. Connect both CLKEN and CLKIN to GND when not in use. 1 HV852DB1 HV852DB1 Schematic HV852K7-G 1 + VDD - REL CDD VDD REL EN CLKIN VDD VA VB GND GND CLKEN 10 9 8 7 6 2 3 4 EL Lamp VDD=ON GND=OFF 5 Typical Performance The specific external components used in the above circuit are: CDD = 2.2F, 6.3V ceramic capacitor and REL = 1.5M. The following was observed when driving a 0.93in2 green lamp and 1.5in2 green lamp. Lamp Size (in2) VDD (V) 2.4 3.0 IDD (mA) 15.6 14.9 14.7 15.1 15.7 19.0 23.4 23.5 23.7 24.1 Vpeak (V) 79 79 79 79 79 66 79 79 79 79 fEL (Hz) Brightness ft-lm 4.30 5.10 5.32 5.50 5.61 2.81 4.77 5.26 5.53 5.73 cd/m2 14.7 17.4 18.2 18.8 19.2 9.6 16.3 18.0 18.9 19.6 0.93 3.6 4.2 5.0 2.4 3.0 245 1.5 3.6 4.2 5.0 HV852DB1 Bill of Materials Components REL CDD U1 Description 1%, 1.5M resistor 2.2F, 6.3V, ceramic chip capacitor EL driver IC Package 0603 0603 DFN-10 Manufacturer Any Any Supertex Inc Part # ----HV852K7-G The above circuit may need to be optimized further based on the specifications of the lamp used. 071006 2 |
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