Microchip HV823 Handleiding

Microchip Niet gecategoriseerd HV823

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Supertex inc.
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 îš¿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
8
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.
2
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
EL
Lamp
330µH
1N4148
+
-
0.1µF1
1nF
Inductor: Murata LQH4N331
ON = 1.5V
OFF = 0V
Enable
HV825
8
7
6
5
VDD
RSW-Osc
CS
LX
REL-Osc
VA
VB
GND
1
2
3
4
Notes:
1. Larger values may be needed depending upon supply impedance.
2. Lamp brightness can vary by type and manufacturer.
1MΩ
1MΩ
VIN
1.5V
0.1µF
100V
EL
Lamp
560µH
1N4148
+
-
0.1µF1
ON = 1.5V
OFF = 0V
1.0nF
Enable
Inductor: Murata LQH4N561
HV825
8
7
6
5
VDD
RSW-Osc
CS
LX
REL-Osc
VA
VB
GND
1
2
3
4
3
AN-H34
Supertex inc.
www.supertex.com
Doc.# DSAN-AN-H34
A101513
Circuit 3
Circuit 4
Application
Lamp
Color/
Size
(in2)
Lamp
Brightness2
(ft-lm)
Supply
Voltage
(V)
Supply
Current
(mA)
Output
Voltage
(VP-P)
Output
Frequency
(Hz)
Pagers (low current) Green/
1.5 4.8 3.0 10 134 260
Application
Lamp
Color/
Size
(in2)
Lamp
Brightness2
(ft-lm)
Supply
Voltage
(V)
Supply
Current
(mA)
Output
Voltage
(VP-P)
Output
Frequency
(Hz)
Pagers Green/
1.7 6.6 1.5/3.0 35 140 400
3.3MΩ
680kΩ
VIN
3.0V
0.1µF
100V
EL
Lamp
1.0mH
1N4148
+
-
0.1µF1
Inductor: Murata LQH4N102
ON = 3.0V
OFF = 0V
Enable
HV823
8
7
6
5
VDD
RSW-Osc
CS
LX
REL-Osc
VA
VB
GND
1
2
3
4
2.0MΩ
1.0MΩ
VIN
1.0 - 1.5V
0.1µF
100V
EL
Lamp
220µH
1N4148
+
-
0.1µF1
Inductor: Murata LQH4N221
Regulated 3.0V
ON = 3.0V
OFF = 0V
Enable
HV823
8
7
6
5
VDD
RSW-Osc
CS
LX
REL-Osc
VA
VB
GND
1
2
3
4
Notes:
1. Larger values may be needed depending upon supply impedance.
2. Lamp brightness can vary by type and manufacturer.

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: HV823

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