Microchip HV816DB2 Manual


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Supertex inc.
Supertex inc.
www.supertex.com
HV816DB2
Doc.# DSDB-HV816DB2
A061013
The Supertex HV816DB2 is a high brightness demoboard
with the circuitry to drive a 10in2 EL lamp using the HV816 in
a 4x4 QFN-16 package.
Simply connect the board to a power supply and an EL lamp
as shown in the circuit schematic on the following page.
The HV816DB2 circuit has been optimized to drive an EL
lamp size of 10in2. For different EL frequencies or smaller
EL lamps sizes, the demoboard can be re-optimized by
changing some of the component values.
The output voltage is typically ±180V for high lamp
brightness, using a single supply input voltage of 5.0V. An
external N-channel MOSFET, Supertex TN2425 is used to
boost the output voltage to a nominal value of 180V with an
input voltage of 5.0V.
For split supply applications, the diode BAS20 between VIN
and VDD has to be removed so separate supplies can be
used for VIN and VDD.
The discharge rate on the output for EL lamp can be adjusted
to minimize audible noise. By increasing the value of the
RSLEW resistor, the discharge rate will increase, which will
reduce audible noise but will also reduce brightness. RSLEW
can be set to a value between 100kΩ and 500kΩ with 100
for maximum brightness.
The HV816DB2 has the provision to set the EL lamp frequency
using the resistor REL on the board or by an external clock
input at the SEL pin. To use an external clock input, the REL
resistor should be removed and the REL-Osc pin should be
connected to GND.
Board Layout and Connection Diagram
Specications
VDD input voltage 2.7 to 5.5V
VIN inductor supply voltage 4.5 to 5.0V
Typical supply current 150mA
Lamp size 10in2
Lamp frequency 190Hz
Converter frequency 150kHz
Board dimensions 27mm x 27mm
General Description
D2
CDD
RREG RSLEW
CG
CIN
LX
M1
D1
CS
RSW
CSW
REL
CFEL
EL Lamp
+
5.0V
-
1.5 to
5.0V
0V
High Brightness 10in2
EL Lamp Driver Demoboard


Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: HV816DB2

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