Microchip HV823DB1 Handleiding

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Supertex inc.
Supertex inc.
www.supertex.com
HV823DB1
Doc.# DSDB-HV823DB1
B032114
The HV823DB1 EL Driver demoboard contains all the circuitry
necessary to drive an EL (Electroluminescent) lamp. Simply
connect it to a power supply and a lamp as shown below.
The supplied circuit has been optimized to drive an 8.0in2 lamp
from a 3.0 to 3.3V supply. The circuit may be customized with
different component values to suit a particular application.
To assist in customization, various circuits optimized for a
variety of applications are provided. For additional assitance
in designing EL driver circuits, please refer to AN-H34 (HV823
& HV825 EL Lamp Driver Circuits).
Board Layout and Connections
EL Driver
Demoboard
Parameter Value
Supply voltage 3.0 to 3.3V
Supply current ~50mA
Lamp size range 3.0 to 12in2
Lamp frequency ~260Hz
Converter frequency ~50KHz
Connections:
EN - Enable Input
Enables/disables the lamp driver. A logic high (VDD) enables
the driver and a logic low (GND) disables the driver. This
input may be connected to a mechanical switch as shown,
or to a logic circuit output that has a source impedance of
less than 20KΩ.
VDD - IC Supply
Supplies the HV823 EL driver IC. The supplied circuit is op-
timized for 3.0V to 3.3V operation. Current draw is typically
100µA when enabled and less than 1µA when disabled.
VIN
- Inductor Supply
Supplies the high voltage power converter. Current draw is
approximately 50mA.
GND - Circuit Ground
Connect to VDD negative terminal. Supply bypass capacitors
for both VDD and VIN are provided on the demoboard. An ex-
ternal supply bypass capacitor is not necessary.
VA and VB
- Lamp Connections
Connect to EL lamp of 3 to 12 square inches. Polarity is ir-
relevant.
Off
On
EL Lamp
connect together
EN
VDD
VIN
GND
HV 823D B1
V
A
VB
R
EL
R
SW
C
SW
C
DD
C
L
C
D
823
3.0 - 3.3V
Enable
General Description Specications
Supertex inc. 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.” Supertex inc. 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 Supertex inc. (website: http//www.supertex.com)
©2014
Supertex inc. All rights reserved. Unauthorized use or reproduction is prohibited.
Supertex inc.
1235 Bordeaux Drive, Sunnyvale, CA
94089
T
el: 408-222-8888
www.supertex.com
2
HV823DB1
Doc.# DSDB-HV823DB1
B032114
HV823DB1 Circuit Schematic
Lamp
Size
(in2)
Lamp1
Brightness
(ft-lm)
Lamp
Color
Lamp
Freq
(Hz)
VDD
(V)
VIN
2
(V)
VIN
Current
(mA)
Component Values
L3
(µH)
REL
(MΩ)
RSW
(KΩ)
CS
(nF)
CSW
(nF)
1.5 4.8 Green 260 3.0 10 1000 3.3 680 100same none
1.7 6.6 Green 400 3.0 1.0 - 1.5 35 220 2.0 1000 100 none
3.5 6.2 Green 400 3.3 25 560 2.0 750 100same none
6.0 3.0 Green 170 3.3 21 560 5.1 680 100same none
7.0 5.8 Green 400 5.0 30 560 2.0 680 10 1.0same
7.0 7.8 Green 400 9.0 23 560 2.0 680 10 1.0same
8.0 6.2 Green 400 5.0 30 560 2.0 820 10 1.0same
9.0 4.7 White 800 5.0 12 12 560 1.0 330 100 1.0
10 4.1 Green 260 5.0 22 1000 3.3 680 10 1.0same
12 5.2 Green 260 3.3 51 220 3.0 680 10same none
12 3.2 Green 260 5.0 19 560 3.0 330 10 1.0same
13 3.1 White 400 5.0 34 560 2.0 680 10 1.0same
13 6.6 White 400 9.0 35 560 2.0 680 10 1.0same
23 2.1 Green 250 3.3 48 330 3.3 1000 10 1.0same
Enable
VDD
VIN
ON = VDD
OFF = GND
REL-Osc
3.0MΩ
EL
Lamp
Note 1
L
220µH
D
1N4148
GND
CIN
4.7µF
RSW-Osc
1.0MΩ
CDD
100nF
HV823
VDD
RSW
CS
LX
REL
VA
VB
GND
CS
10nF
CSW
1.0nF
Note:
1. Tie VDD and VIN together if split suppies are not used.
CDD is not needed when a single supply is used.
Notes:
1. Lamp brightness can vary by type and manufacturer.
2. ‘same’ in the VIN column indicates that V
IN and VDD
are connected together to the same power supply.
3. The recommended inductor is a Murata LQH4N series. Other inductors may be used, however, different inductor characteristics (especially
series resistance) may result in overall circuit performance different from that listed. Please refer to for more information.Application Note AN-H33
Modiying the Supplied Circuit
The supplied circuit is optimized to drive an 8.0in2 green lamp
from a 3.0 to 3.3V supply. To better suit other applications,
the circuit may be modied by changing one or more of the
components. The following table lists various applications in
order of lamp size, along with supply voltages and compo-
nent values. Find the circuit that most closely matches the
desired application and change components as needed. For
component locations, refer to the board layout and connec-
tion diagram at the begining of this note.

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: HV823DB1

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