Datasheet > HV843

HV843

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
超科 - SUPERTEX		驱动器
页数	文件大小	规格书
6页	429K
描述
Low Noise Dual EL Lamp Driver

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HV843 数据手册

HV843

Initial Release

Low Noise Dual EL Lamp Driver

Features

► Low audible noise

General Description

The Supertex HV843 is a low noise, 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 5.8V.

The device is designed to reduce the amount of audible noise

emitted by the lamp. This device uses a single inductor and a

minimum number of passive components to drive two EL lamps.

The nominal regulated output voltage of ±±0V is applied to the

EL lamps. The two EL lamps can be turned ON and OFF by the

two logic input control pins, C₁and C₂. The device is disabled

when both C₁and C₂(pins 1 and 4) are at logic low.

► Independent input control for lamp selection

► 180V_ppoutput voltage

► Split supply capability

► Patented output timing

► One miniature inductor to power both lamps

► Low shutdown current

► Wide input voltage range 2.0V to 5.8V

► Output voltage regulation

► No SCR output

► Available in DFN/MLP - 10 package

The HV843 has an internal oscillator, a switching MOSFET, and

two high voltage EL lamp drivers. Each driver has its own half

bridge common output (COM1 and COM2) connected to a single

pin called COM which minimizes the DC offset seen by the EL

lamp.An external resistor connected between the R_SW-OSCpin and

the voltage supply pin, V_DD, sets the frequency for the switching

MOSFET. The EL lamp driver frequency is set by dividing the

MOSFET switching frequency by 512. An external inductor is

connected between the L_Xand the V_DDpins. Depending on the EL

lamp size, a 1.0 to 10.0nF, 100V capacitor is connected between

C and Ground. The switching MOSFET charges the external

in^Sductor and discharges it into the capacitor at C . The voltage

at C_Sincreases. Once the voltage at C reaches a^Snominal value

of ±0V, the switching MOSFET is turne^Sd OFF to conserve power.

Applications

► Dual display cellular phones

► Keypad and LCD backlighting

► Portable instrumentation

► Dual segment lamps

► Hand held wireless communication devices

Typical Application Circuit

3.3MΩ

1.0µF

EL Lamp 1

1.5V

3.3MΩ

1.5V

C₁

EL₁

EL₂

1.0µF

V_DD

EL Lamp 2

845kΩ

C_DD

0.1µF

V_DD

Com

R_SW-OSC

C_S

L_X

C₂

GND

HV843K7-G

L_X

330µH

C_IN

4.7µF

C_S

3.3nF, 100V

V_IN

12 3 4 5 6

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