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HV833X Datasheet(PDF) 9 Page - Supertex, Inc |
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HV833X Datasheet(HTML) 9 Page - Supertex, Inc |
9 / 9 page 9 HV833 External Component Description External Component Selection Guide Line Diode Fast reverse recovery diode, 100V 1N4148 or equivalent. Cs Capacitor 0.003µF to 0.1µF, 100V capacitor to GND is used to store the energy transferred from the inductor. R EL-osc The EL lamp frequency is controlled via an external R EL resistor connected between REL-osc and VDD of the device. The lamp frequency increases as R EL decreases. As the EL lamp frequency increases, the amount of current drawn from the battery will increase and the output voltage V CS will decrease. The color of the EL lamp is dependent upon its frequency. R SW-osc The switching frequency of the converter is controlled via an external resistor, R SW between RSW-osc and VDD of the device. The switching frequency increases as R SW decreases. With a given inductor, as the switching frequency increases, the amount of current drawn from the battery will decrease and the output voltage, V CS, will also decrease. Lx Inductor The inductor L x 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. As the inductor value decreases, the switching frequency of the inductor (controlled by R SW) should be increased to avoid saturation. 220µH Murata (LQH43MN221) inductors with 5.4Ω series DC resistance is typically recommended. For inductors with thesame inductance value but with lower series DC resistance, lower R SW value is needed to prevent high current draw and inductor saturation. 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. Enable/Disable Configuration The HV833 can be easily enabled and disabled via a logic control signal on the R SW and REL resistors as shown in the Typical Application Circuit on the front page. The control signal can be from a microprocessor. R SW and REL are typically very high values. Therefore, only 10’s of microamperes will be drawn from the logic signal when it is at a logic high (enable) state. When the microprocessor signal is high the device is enabled and when the signal is low, it is disabled. Split Supply Configuration for Battery Voltages of Higher than 6.5V The Typical Application Circuit on the first page can also be used with high battery voltages such as 12V as long as the input voltage, V DD, to the HV833 device is within its specifications of 1.8V to 6.5V. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 • FAX: (408) 222-4895 www.supertex.com 05/02/02rev.8 ©2002 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited. |
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