HV853

更新时间： 2024-11-04 03:43:11

品牌	Logo	应用领域
超科 - SUPERTEX		驱动器
页数	文件大小	规格书
7页	684K
描述
High Voltage, Low Noise, Inductorless EL Lamp Driver

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HV853 数据手册

HV853

High Voltage, Low Noise,

Inductorless EL Lamp Driver

Features

General Description

► No external components required when using an

external EL clock frequency

The Supertex HV853 is a high voltage, low noise EL

(electroluminescent) lamp driver. It is the low noise version of

the HV852 with improved EMI performance, operating over an

input voltage range of 3.2V to 5.0V. It is designed to drive EL

lamps of up to 1.5in², with capacitive values up to 5.3nF. The

HV853 converts a low voltage DC input to a high voltage AC

output across an EL lamp. A nominal regulated output voltage

of 80V is applied to the EL lamp. It uses a charge pump

scheme to boost the input voltage eliminating the need for an

external inductor, diode, and high voltage capacitor commonly

found in conventional topologies.

► Audible noise reduction with improved EMI

► EL frequency can be set by an external resistor

► DC to AC converter

► Drives up to 5.3nF (approx. 1.5in²lamp) load

► Output voltage regulation

► Enable function

► Available in 8-Lead DFN and MSOP packages

Applications

The charge pump circuit discharges its energy into an EL lamp

through a high voltage H-bridge. Once the voltage reaches

its regulated limit, it is turned off to conserve power. The EL

lamp is then discharged to ground and the H-bridge changes

state to allow the charge pump to charge the EL lamp in the

opposite direction.

► Cellular phone keypad

► Watches

► Small handheld wireless devices

► MP3 Players

The EL lamp frequency can be set either by an external

resistor R_ELor by applying an external clock where the clock

frequency is divided by 128 to set the EL lamp frequency.

Typical Application Circuits

V_DD= ON

GND = OFF

V_A

V_B

V_A

V_B

V_DD

R_EL

V_DD

R_EL

V_DD

LAMP

R_EL

C_DD

LAMP

GND

CLK_EN

GND

CLK_EN

CLK_IN

V_DD

GND

HV853

EL Lamp Frequency set by R_EL

HV853

EL Lamp Frequency set by External Clock

12 3 4 5 6 7

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