Microchip HV816DB2 Handleiding

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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 100kΩ

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

CDD

RREG RSLEW

CIN

RSW

CSW

REL

CFEL

EL Lamp

5.0V

1.5 to

5.0V

High Brightness 10in2

EL Lamp Driver Demoboard

HV816DB2

Supertex inc.

www.supertex.com

Doc.# DSDB-HV816DB2

A061013

HV816DB2 Circuit Schematic

Typical Performance

VDD = VIN

(V)

IIN

(mA)

VCS

(VPEAK)

fEL

(Hz)

Lamp Brightness

ft-lm cd/m2

5.0 150 190 190 15 50

HV816K6-G

ES1D

RREG

100kΩ

RSW = 590kΩ

REL = 1.0MΩ

RSLEW

100kΩ

EL Lamp

VREG

GATELX VDRIVE

VOUT

RSLEW-OUT

SEL

RSW-Osc

REL-Osc

VDD

HVGND GND

CFEL

100nF

CSW

100nF

CDD

100 Fµ

CIN

100 Fµ

100nF

LPS5030-473ML

TN2425N8

VIN = 5.0V

3.3nF

200V

NPO

BAS20

EN = 1.5V to VDD

13 7 8

Backside

Slug

1416 15

Note:

CIN can be in the range of 47 to 100µF.

CDD can be in the range of 47 to 100µF.

Connections:

VIN, Input

Inductor input voltage. Single supply can be used for VIN and

VDD or separate supplies can be used. If separate supplies

are used, the diode BAS20 between VIN and VDD has to be

removed. The input range for VIN is 4.5 to 5.0V.

VDD, Input

Device input voltage.Single supply can be used for V IN

and

VDD or separate supplies can be used. If separate supplies

are used, the diode BAS20 between VIN and VDD has to be

removed. The input range for VDD is 2.7 to 5.5V.

GND

Device Ground. Connect to power supply ground.

EN, Input

A CMOS logic input which enables/disables the lamp driver.

A logic high (1.5V to VDD

) enables the driver and a logic low

(0 to 0.2V) disables the driver.

SEL, Input

CMOS logic input to set the EL frequency. To use this pin, the

REL-Osc pin should be connected to GND. The frequency

input at this pin should be 4x the desired output frequency.

An external CLK signal can be used for this input. If this pin

is not used, it should be connected to ground.

VA and VB Outputs

VA and VB are for EL Lamp connections. They should be

connected to an EL lamp. Polarity is irrevelant.

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.” does not assume responsibility for use of devices described, and limits its liabilit Supertex inc. y

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 (website: http//wwwSupertex inc. .supertex.com)