Microchip HV823 Manual

Microchip Ikke kategoriseret HV823

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Side 1/8

Supertex inc.

www.supertex.com

Doc.# DSAN-AN-H34

A101513

AN-H34

Application Note

HV823 & HV825

EL Lamp Driver Circuits

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.

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 1.0nF capacitor from pin 2 to GND is needed

when a 0.01µF CS capacitor is used.

When making component changes, always remove supply

voltage rst. 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.

Circuit Selector Guide

Circuit Applications

Lamp

Color/Size

(in2)

Lamp

Brightness1,2

(ft-lm)

Supply

Voltage

(V)

Supply

Current

(mA)

Output

Voltage

(VP-P)

Output

Frequency

(Hz)

1 Travel clocks, wall thermostats Green/1.5 3.6 1.5 27 450110

2 Pagers Green/2.7 3.3 1.5 45 300110

3 Pagers (low current) Green/1.5 4.8 3.0 10 134 260

4 Pagers Green/1.7 6.6 1.5/3.0 35 140 400

5 GPS units, cell phones, organizers Green/3.5 6.2 3.3 25 148 400

6 GPS units, organizers Green/6.0 3.0 3.3 21 149 170

7 White/7.0PDA, HPC 5.8 5.0 30 126 400

7.8 9.0 23 150 400

GPS units, organizers, RFDC units,

handheld scanners, cell phones,

clocks, radios

Green/8.0 6.2 5.0 30 140 400

9Instrument panels,

keyboard backlights White/9.0 4.7 12/5.0 12 156 800

10 Green/10.0 4.1 5.0 22 145 260PDA, HPC

11 PDA, HPC Green/12.0 5.2 3.3 51 144 260

12 Green/12.0 3.2 5.0 19 260PDA, HPC 115

13 White/13.0PDA, HPC, keypad 3.1 5.0 34 400110

6.6 9.0 35 140 400

14 White/23.0 2.1 3.3 48 103 250PDA, HPC

Notes:

1. Lamp brightness can vary by type and manufacturer.

2. White lamps are inherently less efficient.

AN-H34

Supertex inc.

www.supertex.com

Doc.# DSAN-AN-H34

A101513

Circuit 1

Circuit 2

Application

Lamp

Color/

Size

(in2)

Lamp

Brightness2

(ft-lm)

Supply

Voltage

(V)

Supply

Current

(mA)

Output

Voltage

(VP-P)

Output

Frequency

(Hz)

Travel clocks, wall thermostats Green/

1.5 3.6 1.5 27 450110

Application

Lamp

Color/

Size

(in2)

Lamp

Brightness2

(ft-lm)

Supply

Voltage

(V)

Supply

Current

(mA)

Output

Voltage

(VP-P)

Output

Frequency

(Hz)

Pagers Green/

2.7 3.3 1.5 45 300110

2.0MΩ

1.0MΩ

VIN

1.5V

0.01µF

100V

Lamp

330µH

1N4148

0.1µF1

1nF

Inductor: Murata LQH4N331

ON = 1.5V

OFF = 0V

Enable

HV825

VDD

RSW-Osc

REL-Osc

GND

Notes:

1. Larger values may be needed depending upon supply impedance.

2. Lamp brightness can vary by type and manufacturer.

1MΩ

VIN

1.5V

0.1µF

100V

Lamp

560µH

1N4148

0.1µF1

ON = 1.5V

OFF = 0V

1.0nF

Enable

Inductor: Murata LQH4N561

HV825

VDD

RSW-Osc

REL-Osc

GND

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	HV823

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