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HV823 and HV825 EL lamp driver circuits

Posted: 07 May 2002     Print Version  Bookmark and Share

Keywords:EL lamp driver circuits 

utilizing the Supertex HV823 and HV825 drivers. They have been optimized for a variety of applications and may be used as-is or used as a starting point in designing a circuit for a particular application. For additional assistance in designing a driver circuit, please refer to Application Note AN-H33, Lamp Driver Circuits.

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1 This application note presents fourteen EL driver circuits utilizing the Supertex HV823 and HV825 drivers. They have been optimized for a variety of applications and may be used as-is or used as a starting point in designing a circuit for a particular application. For additional assistance in designing a driver circuit, please refer to Application Note AN-H33, Lamp Driver Circuits. 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 HV823, a 1nF capacitor from pin 2 to GND is needed when a 0.015F CS 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 RSW. HV8XX Series Application Note AN-H34 HV823 & HV825 EL Lamp Driver Circuits by Roshanak Aflatouni, Applications Engineer 11/12/01 Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products liability indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined to be defective due to workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications, refer to the Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, refer to the most current databook or to the Legal/Disclaimer page on the Supertex website. Notes: 1. All values are nominal. 2. Lamp brightness can vary by type and manufacturer. 3. White lamps are inherently less efficient. Circuit Selector Guide1 Lamp Lamp2,3 Supply Supply Output Output Application Size/Color Brightness Voltage Current Voltage Frequency Circuit Travel Clocks, 1.5in2 3.6ft-Im 1.5V 27mA 110VPP 450Hz 1 Wall Thermostats Green Pagers 2.7in2 3.3ft-Im 1.5V 45mA 110VPP 300Hz 2 Green Pagers (low current) 1.5in2 4.8ft-Im 3.0V 10mA 134VPP 260Hz 3 Green Pagers 1.7in2 6.6ft-Im 1.5V/3.0V 35mA 140VPP 400Hz 4 Green GPS Units, Cell Phones, 3.5in2 6.2ft-Im 3.3V 25mA 148VPP 400Hz 5 Organizers Green GPS, Organizers 6.0in2 3.0ft-Im 3.3V 21mA 149VPP 170Hz 6 Green PDA, HPC 7.0in2 5.8ft-Im 5.0V 30mA 126VPP 400Hz 7 White 7.8ft-Im 9.0V 23mA 150VPP 400Hz GPS Units, Organizers, 8.0in2 6.2ft-Im 5.0V 30mA 140VPP 400Hz 8 RFDC Units, Handheld Scanners, Green Cell Phones, Clocks, Radios Instrument Panels, 9.0in2 4.7ft-Im 12V/5.0V 12mA 156VPP 800Hz 9 Keyboard Backlight White PDA, HPC 10in2 4.1ft-Im 5.0V 22mA 145VPP 260Hz 10 Green PDA, HPC 12in2 5.2ft-Im 3.3V 51mA 144VPP 260Hz 11 Green PDA, HPC 12in2 3.2ft-Im 5.0V 19mA 115VPP 260Hz 12 Green PDA, HPC, Keypad 13in2 3.1ft-Im 5.0V 34mA 110VPP 400Hz 13 White 6.6ft-Im 9.0V 35mA 140VPP 400Hz PDA, HPC 23in2 2.1ft-Im 3.3V 48mA 103VPP 250Hz 14 White 2 Lamp Lamp2 Supply Supply Output Output Application Size/Color Brightness Voltage Current Voltage Frequency Travel Clocks, 1.5in2 3.6ft-Im 1.5V 27mA 110VPP 450Hz Wall Thermostats Green Circuit 1 Inductor: Murata LQH4N561 Note: 1. Larger values may be needed depending upon supply impedance. 2. Lamp brightness can vary by type and manufacturer. Lamp Lamp2 Supply Supply Output Output Application Size/Color Brightness Voltage Current Voltage Frequency Pagers 2.7in2 3.3ft-Im 1.5V 45mA 110VPP 300Hz Green Circuit 2 Inductor: Murata LQH4N331 Note: 1. Larger values may be needed depending upon supply impedance. 2. Lamp brightness can vary by type and manufacturer. 1M 1M VIN 1.5V 0.15F 100V VDD RSW-osc Cs Lx REL-osc Va Vb GND EL Lamp HV825LG or HV825MG 8 7 6 5 1 2 3 4 5605H 1N4148 + - 0.15F1 ON = 1.5V OFF = 0V 1nF Enable 2M 1M VIN 1.5V 0.015F 100V 0.15F1 VDD RSW-osc Cs Lx REL-osc Va Vb GND EL Lamp HV825LG or HV825MG 8 7 6 5 1 2 3 4 3305H 1N4148 + - ON = 1.5V OFF = 0V 1nF Enable Lamp Driver Applications 3 Lamp Lamp2 Supply Supply Output Output Application Size/Color Brightness Voltage Current Voltage Frequency Pagers (low current) 1.5in2 4.8ft-Im 3.0V 10mA 134VPP 260Hz Green Circuit 3 Inductor: Murata LQH4N102 Note: 1. Larger values may be needed depending upon supply impedance. 2. Lamp brightness can vary by type and manufacturer. Lamp Lamp2 Supply Supply Output Output Application Size/Color Brightness Voltage Current Voltage Frequency Pagers 1.7in2 6.6ft-Im 1.5V/3V 35mA 140VPP 400Hz Green Circuit 4 Inductor: Murata LQH4N221 Note: 1. Larger values may be needed depending upon supply impedance. 2. Lamp brightness can vary by type and manufacturer. Lamp Driver Applications 3.3M 680K VIN 3V 0.15F 100V 0.15F1 VDD RSW-osc Cs Lx REL-osc Va Vb GND EL Lamp HV823LG 8 7 6 5 1 2 3 4 1mH 1N4148 + - ON = 3V OFF = 0V Enable 2M Enable 1M VIN 1.0 - 1.5V ON = 3V OFF = 0V Regulated 3V 0.15F 100V VDD RSW-osc Cs Lx REL-osc Va Vb GND EL Lamp HV823LG 8 7 6 5 1 2 3 4 2205H 1N4148 + - 0.15F1 4 Lamp Lamp2 Supply Supply Output Output Application Size/Color Brightness Voltage Current Voltage Frequency GPS Units, Cell Phones, 3.5in2 6.2ft-Im 3.3V 25mA 148VPP 400Hz Organizers Green Circuit 5 Inductor: Murata LQH4N561 Note: 1. Larger values may be needed depending upon supply impedance. 2. Lamp brightness can vary by type and manufacturer. Lamp Lamp2 Supply Supply Output Output Application Size/Color Brightness Voltage Current Voltage Frequency GPS, Organizers 6in2 3.0ft-Im 3.3V 21mA 149VPP 170Hz Green Circuit 6 Inductor: Murata LQH4N561 Note: 1. Larger values may be needed depending upon supply impedance. 2. Lamp brightness can vary by type and manufacturer. Lamp Driver Applications 2M 750K VIN 3.3V 0.15F 100V VDD RSW-osc Cs Lx REL-osc Va Vb GND EL Lamp HV823LG 8 7 6 5 1 2 3 4 5605H 1N4148 + - 0.15F1 ON = 3.3V OFF = 0V Enable 5.1M 680K VIN 3.3V 0.15F 100V VDD RSW-osc Cs Lx REL-osc Va Vb GND EL Lamp HV823LG 8 7 6 5 1 2 3 4 5605H 1N4148 + - 0.15F1 ON = 3.3V OFF = 0V Enable 5 Lamp Lamp2 Supply Supply Output Output Application Size/Color Brightness Voltage Current Voltage Frequency PDA, HPC 7in2 5.8ft-Im 5V 30mA 126VPP 400Hz White 7.8ft-Im 9V 23mA 150VPP 400Hz Lamp Lamp2 Supply Supply Output Output Application Size/Color Brightness Voltage Current Voltage Frequency GPS Units, Organizers, 8in2 6.2ft-Im 5V 30mA 140VPP 400Hz RFDC Units, Handheld Scanners, Green Cell Phones, Clocks, Radios Circuit 7 Inductor: Murata LQH4N561 Note: 1. Larger values may be needed depending upon supply impedance. 2. Lamp brightness can vary by type and manufacturer. Circuit 8 Inductor: Murata LQH4N561 Note: 1. Larger values may be needed depending upon supply impedance. 2. Lamp brightness can vary by type and manufacturer. Lamp Driver Applications 2M 680K 1nF 0.15F1 VIN 5V or 9V 0.015F 100V EL Lamp HV823LG 8 7 6 5 1 2 3 4 5605H 1N4148 + - VDD RSW-osc Cs Lx REL-osc Va Vb GND ON = 5V or 9V OFF = 0V Enable 2M 820K 1nF 0.15F1 VIN 5V 0.015F 100V EL Lamp HV823LG 8 7 6 5 1 2 3 4 5605H 1N4148 + - VDD RSW-osc Cs Lx REL-osc Va Vb GND ON = 5V OFF = 0V Enable 6 Circuit 10 Note: 1. Larger values may be needed depending upon supply impedance. 2. Lamp brightness can vary by type and manufacturer. Circuit 9 Inductor: Murata LQH4N561 Note: 1. Larger values may be needed depending upon supply impedance. 2. Lamp brightness can vary by type and manufacturer. Lamp Lamp2 Supply Supply Output Output Application Size/Color Brightness Voltage Current Voltage Frequency Instrument Panels, 9in2 4.7ft-Im 12V/5V 12mA 156VPP 800Hz Keyboard Backlight White Lamp Lamp2 Supply Supply Output Output Application Size/Color Brightness Voltage Current Voltage Frequency PDA, HPC 10in2 4.1ft-Im 5V 22mA 145VPP 260Hz Green Inductor: Murata LQH4N102 Lamp Driver Applications 1M 330K 1nF 0.15F1 VIN 12V 0.15F 100V EL Lamp HV823LG 8 7 6 5 1 2 3 4 5605H 1N4148 + - VDD RSW-osc Cs Lx REL-osc Va Vb GND ON = 5V OFF = 0V 5V Enable 3.3M 680K 1nF 0.15F1 VIN 5V 0.015F 100V EL Lamp HV823LG 8 7 6 5 1 2 3 4 1mH 1N4148 + - VDD RSW-osc Cs Lx REL-osc Va Vb GND ON = 5V OFF = 0V Enable 7 Lamp Lamp2 Supply Supply Output Output Application Size/Color Brightness Voltage Current Voltage Frequency PDA, HPC 12in2 5.2ft-Im 3.3V 51mA 144VPP 260Hz Green Circuit 11 Inductor: Murata LQH4N221 Note: 1. Larger values may be needed depending upon supply impedance. 2. Lamp brightness can vary by type and manufacturer. Lamp Lamp2 Supply Supply Output Output Application Size/Color Brightness Voltage Current Voltage Frequency PDA, HPC 12in2 3.2ft-Im 5V 19mA 115VPP 260Hz Green Circuit 12 Inductor: Murata LQH4N561 Note: 1. Larger values may be needed depending upon supply impedance. 2. Lamp brightness can vary by type and manufacturer. Lamp Driver Applications 3M 680K 0.15F1 VIN 3.3V 0.15F 100V EL Lamp HV823LG 8 7 6 5 1 2 3 4 2205H 1N4148 + - VDD RSW-osc Cs Lx REL-osc Va Vb GND ON = 3.3V OFF = 0V Enable 3M 330K 1nF 0.15F1 VIN 5V 0.015F 100V EL Lamp HV823LG 8 7 6 5 1 2 3 4 5605H 1N4148 + - VDD RSW-osc Cs Lx REL-osc Va Vb GND ON = 5V OFF = 0V Enable 8 Lamp Lamp2 Supply Supply Output Output Application Size/Color Brightness Voltage Current Voltage Frequency PDA, HPC, Keypad 13in2 3.1ft-Im 5V 34mA 110VPP 400Hz White 6.6ft-Im 9V 35mA 140VPP 400Hz Circuit 13 Inductor: Murata LQH4N561 Note: 1. Larger values may be needed depending upon supply impedance. 2. Lamp brightness can vary by type and manufacturer. Lamp Lamp2 Supply Supply Output Output Application Size/Color Brightness Voltage Current Voltage Frequency PDA, HPC 23in2 2.1ft-Im 3.3V 48mA 103VPP 250Hz White Circuit 14 Inductor: Murata LQH4N331 Note: 1. Larger values may be needed depending upon supply impedance. 2. Lamp brightness can vary by type and manufacturer. Lamp Driver Applications 2M 680K VIN 5V or 9V 0.015F 100V VDD RSW-osc Cs Lx REL-osc Va Vb GND EL Lamp HV823LG 8 7 6 5 1 2 3 4 5605H 1N4148 + - ON = 5V or 9V OFF = 0V 0.15F1 1nF Enable 3.3M 1M 1nF 0.15F1 VIN 3.3V 0.015F 100V EL Lamp HV823LG 8 7 6 5 1 2 3 4 3305H 1N4148 + - VDD RSW-osc Cs Lx REL-osc Va Vb GND ON = 3.3V OFF = 0V Enable 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 7 FAX: (408) 222-4895 www.supertex.com 11/12/01 )2001 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited.




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