HV839MG-G 데이터 시트보기 (PDF) - Supertex Inc

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HV839MG-G

High Voltage Dual EL Lamp Driver IC

Supertex Inc 

Supertex inc.

HV839

High Voltage Dual EL Lamp Driver IC

Features

►► Independent input control for lamp selection

►► Split supply capability

►► Patented output timing

►► One miniature inductor to power both lamps

►► Low shutdown current

►► Wide input voltage range 2.0 to 5.8V

►► Output voltage regulation

►► No SCR output

►► Available in small packages (10-lead MSOP and

10-lead DFN)

Applications

►► Mobile cellular phones, dual display

►► Keypad and LCD backlighting

►► Portable instrumentation

►► Dual segment lamps

►► Hand held wireless communication devices

General Description

The Supertex HV839 is a high voltage driver designed for driving

two EL lamps with a combined area of 3.5in2. The input supply

voltage range is from 2.0 to 5.8V. The device is designed to

reduce the amount of audible noise emitted by the lamp. This

device uses a single inductor and minimum number of passive

components to drive two EL lamps. The nominal regulated

output voltage of ±90V is applied to the EL lamps. The two EL

lamps can be turned ON and OFF by the two logic input control

pins, C1 and C2. The device is disabled when both C1 and C2

(pins 1 and 4) are at logic low.

The HV839 has an internal oscillator, a switching MOSFET, and

two high voltage EL lamp drivers. An external resistor connected

between the RSW-Osc pin and the voltage supply pin VDD sets

the frequency for the switching MOSFET. The EL lamp driver

frequency is set by dividing the MOSFET switching frequency

by 128. An external inductor is connected between the LX and

the VDD pins. Depending on the EL lamp size, a 1.0 to 10.0nF,

100V capacitor is connected between CS and GROUND. The

two EL lamps are connected between EL1 to COM and EL2

to COM. The switching MOSFET charges the external inductor

and discharges it into the capacitor at CS. The voltage at CS

increases. 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 and switch in opposite states to achieve 180V across

the EL lamp.

Typical Application Circuit

VEN = ON

0 = OFF

VEN = ON

0 = OFF

+

VDD

-

+

VIN

-

1 C1

EL1 10

2 VDD

EL2 9

CDD

3 RSW-Osc COM 8

RSW-Osc 4 C2

CS 7

5 GND

6

LX

CIN

HV839

EL Lamp 11

D

LX

CS

EL Lamp 21

1. The bigger sized lamp should be tied to EL1 and the smaller

sized lamp to EL2 terminals (pins 10 and 9 respectively)

Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com

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