HV832MG データシートの表示（PDF） - Supertex Inc

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HV832MG

Dual High Voltage, Low Noise EL Lamp Driver

Supertex Inc 

HV832

HV832

Dual High Voltage, Low Noise EL Lamp Driver

Features

❏ 8-pin dual EL driver IC

❏ Input control for lamp selection

❏ Split supply capability

❏ Patented output timing

❏ One minature inductor to power both lamps

❏ 150nA shutdown current

❏ Wide input voltage range (2.0V to 5.0V)

❏ Output voltage regulation

❏ No SCR output

Applications

❏ Dual display cell phones

❏ Keypad and LCD backlighting

❏ Dual segment lamps

❏ Handheld wireless communication devices

Typical Application

General Description

The Supertex HV832 is a high voltage driver designed for driving

two EL lamps with a combined area of 3.5 square inches. The

input supply voltage range is from 2.0V to 5.0V. The device is

designed to reduce the amount of audible noise emitted by the

lamp. The device uses a single inductor and a minimum number

of passive components. The nominal regulated output voltage

that is applied to the EL lamp is ±90V.

The HV832 has an internal oscillator, a switching MOSFET, and

two high voltage EL lamp drivers. The frequency for the switching

MOSFET is set at 51KHz nominal. The EL lamp driver frequency

is set by dividing the MOSFET switching frequency by 128. An

external inductor is connected between the LX and VDD pins or

VIN for split supply applications. A 0.001 to 0.01µF, 100V

capacitor is connected between CS and Ground. The EL lamps

are connected between EL1 to Com and EL2 to Com.

An input control pin is available to select various modes of the

device. Each logic pulse applied to the control pin will cause the

device to change to the next mode. The sequence for the modes

is: (1) EL1 on only, (2) EL2 on only, (3) both EL1 and EL2 on, and

(4) device shuts down. During power up of the device, the mode

will default to shut down.

The switching MOSFET charges the external inductor and

discharges it into the capacitor at Cs. The voltage at CS will start

to increase. Once the voltage at Cs reaches a nominal value of

90V, the switching MOSFET is turned off to conserve power. The

outputs EL1 to Com and EL2 to Com are configured as H bridges

EL1/EL2 and Com are switching in opposite states to achieve

180V across the EL lamp.

VDD

Logic Input Pulse

+

VIN _

CIN

1 EL1

2 VDD

EL2 8

Com 7

3 Control

CS 6

4 GND

LX 5

HV832MG

EL Lamp 1

EL Lamp 2

LX

CS

12/13/01

Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products liability

indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined to be defective due to

workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and s1pecifications are subject to change without notice. For the latest product specifications, refer to the

Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, refer to the most current databook or to the Legal/Disclaimer page on the Supertex website.

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