Microchip HV861DB1 Handleiding

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Supertex inc.

www.supertex.com

HV861DB1

Doc.# DSDB-HV861DB1

A032813

General Description

The Supertex HV861DB1 demoboard contains all the

necessary circuitry to demonstrate the features of the HV861

dual EL Lamp driver.

Simply connect it to a power supply and a lamp as shown in

Figure 1.

A 2.2µF capacitor is connected between VREF and GND. It

allows the lamp to slowly (in about 400ms) brighten up/dim

down during power up/power down. The dimming feature is

common to both lamps.

Board Layout

Dimmable, Low Noise, Dual EL Lamp

Driver Demoboard

Specications

Parameter Value

VDD input voltage: 2.5V to 4.5V

VIN inductor supply voltage: 3.2V to 4.2V

Typical supply current: 28mA

Lamp size: 4.5in2

Lamp frequency: 188Hz

Converter frequency: 98kHz

Connections:

EN1 and EN2: Lamp Selection

CMOS logic inputs which enable/disable the lamp drivers.

When EN1 is connected to VDD/GND, Lamp 1 (EL1) will

be ON/OFF. When EN2 is connected to VDD/GND, Lamp 2

(EL2) will be ON/OFF.

VDD: IC Supply

Supplies the HV861 EL driver IC. The supplied circuit is op-

timized for 3.0V operation.

VIN: Inductor Supply

Supplies the high voltage power converter. The demoboard

is optimized for 3.2V to 4.2V operation

GND: Circuit Ground

Connect to VDD and VIN negative terminals. Supply bypass

capacitor for both VDD and VIN are provided on the demo

board. External supply bypass capacitors are not necessary.

EL1 and EL2: Lamp Connections

Connects to Lamps 1 and 2.

COM1 and COM2: Lamp Connections

Connects to the other side of Lamps 1 and 2.

Actual Dimensions: 26mm x 24mm

Notes:

All of the above connections must be made before powering up the supply voltages.

The VREG pin should not be touched after power-up.

EL1

COM1

COM2

EL2

VDD

EN1

EN2

GND

VIN

HV861DB1

Supertex inc.

www.supertex.com

Doc.# DSDB-HV861DB1

A032813

Figure 1: HV861DB1 Circuit Schematic

Typical Performance

VDD

(V)

VIN

(V) Lamp IIN

(mA)

VCS

(VPEAK)

fEL

(Hz)

Lamp Brightness

(cd/m2)

EL1 EL2

3.0 3.2

EL1 ON 21.3

93 188

14.6 -

EL2 ON 14.8 - 17.8

EL1 & EL2 ON 30.9 13.9 16.6

3.0 3.6

EL1 ON 18.8

93 188

14.7 -

EL2 ON 12.8 - 17.9

EL1 & EL2 ON 27.5 14.4 17.4

3.0 3.8

EL1 ON 17.8

93 188

14.8 -

EL2 ON 12.0 - 18.0

EL1 & EL2 ON 26.3 14.6 17.6

3.0 4.0

EL1 ON 16.9

93 188

14.8 -

EL2 ON 11.4 - 18.0

EL1 & EL2 ON 25.0 14.6 17.7

3.0 4.2

EL1 ON 16.0

93 188

14.9 -

EL2 ON 10.8 - 18.1

EL1 & EL2 ON 24.0 14.7 17.8

Load size: EL1 = 10.8nF, EL2 = 9.3nF, total lamp size ~4.5in

100µH Coilcraft

LPS4012

3.3MΩ

2.0MΩ

825kΩ

VDD = 3.0V

0.1µF

2.2µF

Input Logic Control:

ON = 1.5V to VDD

OFF = 0V to 0.2V

GND

EN1

VDD

8 7

16 13

PWM

VREF

EN2

RSW-Osc

REL-Osc

VREG VOUT LX CS

EL1

COM1

EL2

COM2

HV861

EL1

EL2

3.3nF

100V NPO

BAS20

4.7µF

VIN = 3.2V to 4.2V

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)