Microchip HV816DB2 Handleiding

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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 10in2EL 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

RSLEWresistor, 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 100kΩ

for maximum brightness.

The HV816DB2 has the provision to set the EL lamp frequency

using the resistor RELon the board or by an external clock

input at the SELpin. 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 voltage2.7 to 5.5V

VIN inductor supply voltage4.5 to 5.0V

Typical supply current150mA

Lamp size10in2

Lamp frequency190Hz

Converter frequency150kHz

Board dimensions27mm 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

Product specificaties