Microchip HV857 Handleiding
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Supertex inc.
Supertex inc.
www.supertex.com
Doc.# DSAN-AN-H63
A040413
AN-H63
Application Note
HV857 EL Lamp Driver Circuits
This application note presents six EL driver circuits utilizing
the Supertex HV857 integrated circuit. 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.
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. Excessive
input current may be a good indication of connection errors
or incorrect component values. A sharp rise in current usually
indicates a saturated inductor. To avoid inductor saturation,
use a higher current rated inductor or increase the conversion
frequency by lowering the RSW resistor value.
Circuit Selector Guide
Circuit Applications
Lamp
Color/
Size
(in2)
Lamp
Brightness1
(ft-lm)
Supply
Voltage
(V)
Supply
Current
(mA)
Output
Voltage
(VP-P)
Output
Frequency
(Hz)
1Watches. Green/
1.0 4.22.78.5 166197
2Travel clocks, wall thermostats,
thermometers.
Green/
1.6 5.91.5/3.0 48.0154393
3MP3 players, travel clocks, wall
thermostats, thermometers.
Green/
1.6 3.53.010.0 156197
4Pulse oximeters, cell phones,
glucometers.
Green/
2.0 5.33.011.8 172197
5GPSs, cell phones, organizers,
glucometers, BP monitors.
Green/
3.0 5.93.020.9 172260
6
PDAs, GPSs, cell phones, radios,
clocks, organizers,
glucometers, BP monitors.
Green/
4.0 8.53.038.0 172393
Notes:
1. Lamp brightness can vary by type and manufacturer.
Product specificaties
| Merk: | Microchip |
| Categorie: | Niet gecategoriseerd |
| Model: | HV857 |
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