HV859 Ver la hoja de datos (PDF) - Supertex Inc

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componentes Descripción

Fabricante

HV859

High Voltage EL Lamp Driver for Low Noise Applications

Supertex Inc 

Fig. 1: Typical Application/Test Circuit

ON = VDD

OFF = 0V

+

VDD = VIN

-

Enable Signal

560kΩ

1 VDD

HV859

VA 8

VDD

2 RSW-Osc

VB 7

1.0μF

2.0MΩ

3 REL-Osc

4 GND

CS 6

LX 5

HV859

2.0kΩ Equivalent to 3.0in2 lamp

10nF

BAS21**

220μH*

3.3nF

200V

* Murata Inductor - LQH32CN221K21

** BAS21 - General Purpose HV diode

Fig. 2: Split Supply and Enable/Disable Configuration

ON = VDD

OFF = 0V

Regulated

Voltage = VDD

+

VIN

-

Enable Signal

RSW

CIN

REL

1 VDD

HV859

2 RSW-Osc

VA 8

VB 7

3 REL-Osc

CS 6

4 GND

LX 5

D

LX

EL Lamp

CS

Split Supply Configuration

The HV859 can also be used for handheld devices operating

from a battery where a regulated voltage is available. This

is shown in Fig. 2. The regulated voltage can be used to

run the internal logic of the HV859. The amount of current

necessary to run the internal logic is 150µA max at a VDD of

3.0V. Therefore, the regulated voltage could easily provide

the current without being loaded down.

The HV859 can be easily enabled and disabled via a logic

control signal on the RSW and REL resistors as shown in Fig. 2

below. The control signal can be from a microprocessor. RSW

and REL are typically very high values. Therefore, only 10’s

of microamperes will be drawn from the logic signal when it

is at a logic high (enable) state. When the microprocessor

signal is high the device is enabled, and when the signal is

low, it is disabled.

Doc.# DSFP-HV859

C073013

Supertex inc.

4

www.supertex.com

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