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| HV845DB1 Low Noise, Dual EL Lamp Driver General Description The Supertex HV845DB1 demo board contains all necessary circuitry to demonstrate the features of the HV845 dual 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 ANH33 (effect of external components on performance of Supertex EL drivers). Specifications VDD input voltage: VIN inductor supply voltage: Supply Current: Lamp Size: Lamp Frequency: Converter frequency: Value 3.0V 3.3V - 4.2V 13mA 2.3in2 195Hz 98kHz Board Layout and Connection Diagram C1 VDD C2 GND VIN Actual Size: 17.3mm x 14.4mm Com1 EL1 EL2 Com2 Connections: Controls C1 and C2: Lamp Selection Various modes of the device are selected via the C1 and C2 pins. When C1 is connected to VDD/GND, Lamp 1 (EL1) will be ON/OFF. When C2 is connected to VDD/GND, lamp 2 (EL2) will be ON/OFF. When both C1 and C2 are connected to GND, the device shuts down. These inputs may be connected to a mechanical switch, or to a logic circuit output that has a source impedance of less than 20k. VDD: IC Supply Supplies the HV845 EL driver IC. The supplied circuit is optimized for 3.0V operation. VIN: Inductor Supply Supplies the high voltage power converter. The demoboard is optimized for 3.3V to 4.2V operation. 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. EL1 and EL2: Lamp Connections Connects to lamps 1 and 2. Polarity is irrelevant. Com1 and Com2: Lamp Connections Connects to the other side of lamps 1 and 2. Polarity is irrelevant. 1 HV845DB1 Figure1: HV845DB1 Circuit Schematic 1N4148 VIN Cs 3.3nF 4.7F 5 1 6 + CIN LX EL Lamp 1 VDDLX RSW-OSC C1 C2 CS EL1 COM1 EL2 GND COM2 4 10 8 9 7 + VDD CDD 0.1F VIH =0N 0 = OFF VIH =0N 0 = OFF 2 RSW-OSC - 12 3 EL Lamp 2 HV845K7-G Typical Performance The specific external components used in the above circuit are: RSW = 845k, LX = 330H Coilcraft (LPS3010-334ML), CS= 3.3nF 100V NPO. The following performance was observed when driving EL1 = 1.3in2 and EL2 = 0.93in2 green lamps. VDD (V) VIN (V) Lamp EL1 ON IIN (mA) 8.96 6.96 12.35 7.65 5.98 11.13 6.19 4.79 8.51 VCS (VPEAK) fEL (Hz) Lamp Brightness (cd/m2) EL1 17.04 16.17 17.45 EL2 16.36 14.72 16.78 15.79 17.20 16.20 3.3 EL2 ON EL1 and EL2 ON EL1 ON 3.0 3.7 EL2 ON EL1 and EL2 ON EL1 ON 88 195 16.64 17.71 17.27 4.2 EL2 ON EL1 and EL2 ON Bill of Materials Components Description LX CS RSW CIN CDD Diode U1 330H Inductor 3.3nF, 100V, NPO chip capacitor 1%, 845k chip resistor 4.7F, 10V ceramic chip capacitor 0.1F, 16V ceramic chip capacitor 100V fast recovery diode EL driver IC Package --0805 0805 0805 0805 SOT-23 MLP/QFN-12 Manufacturer Coilcraft Novacap Any Any Any Diodes Inc Supertex Inc Part Number LPS3010-334ML 0805N332K101NT ------1N4148 HV845K7-G The above circuit may need to be optimized further based on specification of the lamp used. 032107 2 |
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