HV & HV Driver Circuits ANH Note This application note presents fourteen driver circuits utilizing the Supertex HV and HV drivers. They have been optimized for a variety of applications and may be used asis or used as a starting point in designing a circuit for a particular application. When constructing and testing one of the driver circuits listed below, keep in mind that results may differ from those given due to component tolerances and lamp characteristics. For the HV, a.0nf capacitor from pin to is needed when a 0.0µF C S capacitor is used. When making component changes, always remove supply voltage first. After making adjustments, bring up the supply voltage slowly starting from the minimum required device input voltage while monitoring input current. A sharp rise in current usually indicates a saturated inductor. Use a higher current rated inductor, a higher value inductor, or increase conversion frequency by lowering R SW. Circuit Selector Guide Circuit s Brightness, (Hz Travel clocks, wall thermostats... 0 0 Pagers... 0 00 Pagers (low current...0 0 0 Pagers.../.0 0 00 GPS units, cell phones, organizers... 00 GPS units, organizers.0.0. 9 0 White/.0..0 0 00. 9.0 0 00 GPS units, organizers, RFDC units, handheld scanners, cell phones,.0..0 0 0 00 clocks, radios 9 Instrument panels, keyboard backlights White/9.0. /.0 00 0 0.0..0 0.0.. 0.0..0 9 0, keypad White/.0..0 0 00. 9.0 0 00 White/.0.. 0 0. brightness can vary by type and manufacturer.. White lamps are inherently less efficient. Doc.# DSANANH A0
Circuit Travel clocks, wall thermostats. Brightness ANH (Hz.. 0 0 ON =.V MΩ.V 0.µF 0µH N 0.µF 00V MΩ RSWOsc HV.0nF Inductor: Murata LQHN Circuit Pagers. Brightness (Hz.. 0 00 ON =.V.0MΩ.V 0.µF 0µH N 0.0µF 00V.0MΩ RSWOsc HV nf Inductor: Murata LQHN. Larger values may be needed depending upon supply impedance.. brightness can vary by type and manufacturer. Doc.# DSANANH A0
Circuit Pagers (low current. Brightness ANH (Hz..0 0 0 ON =.0V.MΩ.0V 0.µF.0mH N 0.µF 00V 0kΩ RSWOsc HV Inductor: Murata LQHN0 Circuit Pagers. Brightness (Hz../.0 0 00 ON =.0V Regulated.0V.0MΩ.0.V 0.µF 0µH N 0.µF 00V.0MΩ RSWOsc HV Inductor: Murata LQHN. Larger values may be needed depending upon supply impedance.. brightness can vary by type and manufacturer. Doc.# DSANANH A0
Circuit GPS units, cell phones, organizers. Brightness ANH (Hz.. 00 ON =.V.0MΩ.V 0.µF 0µH N 0.µF 00V 0kΩ RSWOsc HV Inductor: Murata LQHN Circuit GPS units, organizers.0 Brightness (Hz.0. 9 0 ON =.V.MΩ.V 0.µF 0µH N 0.µF 00V 0kΩ RSWOsc HV Inductor: Murata LQHN. Larger values may be needed depending upon supply impedance.. brightness can vary by type and manufacturer. Doc.# DSANANH A0
Circuit White/.0 Brightness ANH (Hz..0 0 00. 9.0 0 00 ON =.0 or 9.0V.0MΩ.0 or 9.0V 0.µF 0µH N 0.0µF 00V 0kΩ RSWOsc HV.0nF Inductor: Murata LQHN Circuit GPS units, organizers, RFDC units, handheld scanners, cell phones, clocks, radios.0 Brightness (Hz..0 0 0 00 ON =.0V.0MΩ.0V 0.µF 0µH N 0.0µF 00V 0kΩ RSWOsc HV.0nF Inductor: Murata LQHN. Larger values may be needed depending upon supply impedance.. brightness can vary by type and manufacturer. Doc.# DSANANH A0
Circuit 9 Instrument panels, keyboard backlights White/ 9.0 Brightness ANH (Hz. /.0 00 ON =.0V.0V.0MΩ V 0.µF 0µH N 0.µF 00V 0kΩ RSWOsc HV.0nF Inductor: Murata LQHN Circuit 0 0 Brightness (Hz..0 0 ON =.0V.MΩ.0V 0.µF.0mH N 0.0µF 00V 0kΩ RSWOsc HV.0nF Inductor: Murata LQHN0. Larger values may be needed depending upon supply impedance.. brightness can vary by type and manufacturer. Doc.# DSANANH A0
Circuit Brightness ANH (Hz.. 0 ON =.V.0MΩ.V 0.µF 0µH N 0.µF 00V 0kΩ RSWOsc HV Inductor: Murata LQHN Circuit Brightness (Hz..0 9 0 ON =.0V.0MΩ.0V 0.µF 0µH N 0.0µF 00V 0kΩ RSWOsc HV.0nF Inductor: Murata LQHN. Larger values may be needed depending upon supply impedance.. brightness can vary by type and manufacturer. Doc.# DSANANH A0
Circuit, keypads White/.0 Brightness ANH (Hz..0 0 00. 9.0 0 00 ON =.0 or 9.0V.0MΩ.0 or 9.0V 0.µF 0µH N 0.0µF 00V 0kΩ RSWOsc HV.0nF Circuit ON =.V.V White/ 0.µF 0µH N 0.0µF 00V Brightness Inductor: Murata LQHN (Hz.. 0 0.0MΩ.0nF RSWOsc.MΩ HV Inductor: Murata LQHN. Larger values may be needed depending upon supply impedance.. brightness can vary by type and manufacturer. 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. 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 (website: http// 0 All rights reserved. Unauthorized use or reproduction is prohibited. Doc.# DSANANH A0 Bordeaux Drive, Sunnyvale, CA 909 Tel: 0