Datasheet > HV853

HV853

更新时间： 2024-01-22 18:18:45

品牌	Logo	应用领域
美国微芯 - MICROCHIP		/
页数	文件大小	规格书
7页	603K
描述
HV853 is a high voltage, low noise EL (electroluminescent) lamp driver. It is the low noise versio

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HV853 数据手册

HV853

EL Lamp Dimming Using PWM

EL lamp dimming can be achieved by applying a PWM signal to the ENABLE pin. This is done by pulse skipping the out-

put pulses. The PWM frequency should be kept below the EL frequency but above 50Hz to avoid ﬂickering.

Figure 4: PWM Dimming Circuit

VDD

REL

R_EL

EL Lamp

V_DD

C_DD

GND

PWM

Signal

GND

CLKIN CLKEN

HV853MG

Pin Descriptions: 10-Lead DFN (K7) / 8-Lead MSOP (MG)

Name

Description

Pin #

VDD

Input supply voltage pin.

An external resistor to VDD will set the EL lamp frequency. The EL frequency is inversely

proportional to the R_ELresistor value. A 1.5MΩ resistor would provide a nominal lamp fre-

quency of 280Hz

REL

f_EL= (1.5MΩ)(280Hz) / (R_EL)

When using an external clock to set the EL lamp frequency, the REL pin should be con-

nected to ground.

Enable input pin. Logic high will turn the device on. An external R-C circuit can be added for

a delayed turn off.

Logic input pin. An external logic clock applied to this pin can be used to set the EL lamp

frequency (see Figure 3). The EL lamp frequency is the external clock frequency divided by

128. This is useful for applications requiring the EL lamp to be synchronized to a system

clock. Connect to ground when not in use.

CLKIN

No connect.

Logic input pin. Logic high will cause the EL lamp frequency to be set by the CLKIN input.

Logic low will cause the EL lamp frequency to be set by the external R_ELresistor.

CLKEN

7,8

GND

IC ground pin.

EL lamp driver output pin. The EL lamp is connected across VA and VB terminals.

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

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