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HV832MG Datasheet(PDF) 6 Page - Supertex, Inc |
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HV832MG Datasheet(HTML) 6 Page - Supertex, Inc |
6 / 6 page 6 HV832 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 • FAX: (408) 222-4895 www.supertex.com 12/13/01rev.8 ©2001 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited. External Component Description External Component Selection Guide Line Diode Fast reverse recovery diode, IN914 or equivalent. Cs Capacitor 0.003 µF to 0.1µF, 100V capacitor to GND is used to store the energy transferred from the inductor. Lx Inductor The inductor Lx is used to boost the low input voltage by inductive flyback. When the internal switch is on, the inductor is being charged. When the internal switch is off, the charge stored in the inductor will be transferred to the high voltage capacitor C S. The energy stored in the capacitor is connected to the internal H-bridge and therefore to the EL lamp. In general, smaller value inductors, which can handle more current, are more suitable to drive larger size lamps. Lamp As the EL lamp size increases, more current will be drawn from the battery to maintain high voltage across the EL lamp. The input power, (V IN x IIN), will also increase. If the input power is greater than the power dissipation of the package (300mW), an external resistor in series with one side of the lamp is recommended to help reduce the package power dissipation. Split Supply Configuration The HV832 can also be used for handheld devices operating from a battery where a regulated voltage is available. This is shown in Figure 2. The regulated voltage can be used to run the internal logic of the HV832. The amount of current necessary to run the internal logic is 150 µA Max at a V DD of 3.0V. Therefore, the regulated voltage could easily provide the current without being loaded down. Figure 2: Split Supply EL Lamp 1 + _ CS 1 2 3 4 8 6 5 HV832MG 7 Battery Voltage=VIN EL1 VDD Control GND LX CS Com EL2 Regulated Voltage=VDD Logic Input Pulse EL Lamp 2 LX CIN |
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