Fremont Micro Devices
FT881 Preliminary
Universal High Brightness LED Driver
FEATURES
Switch mode controller for single switch LED
drivers
Open loop peak current controller
Internal 15V to 500V linear regulator
Constant frequency or constant off-time
operation
Linear and PWM dimming capability
Requires few external components for operation
Over current protection
Maximum power supply voltage up to 20V
TYPICAL APPLICATIONS
DC/DC or AC/DC LED Driver Applications
RGB Backlighting LED Driver
Back Lighting of Flat Panel Displays
General Purpose Constant Current Source
Signage and Decorative LED Lighting
Chargers
DESCRIPTION
The FT881 is an open loop current mode control
LED driver IC. The FT881 can be programmed to
operate in either a constant frequency or constant
off-time mode. It includes a 15-500V linear regulator
which allows it to work from a wide range of input
voltages without the need for an external low voltage
supply. The FT881 includes a PWM dimming input
that can accept an external control signal with a duty
ratio of 0-100% and a frequency of up to a few
kilohertz. It also includes a 0-250mV linear dimming
input which can be used for linear dimming of the
LED current and over temperature protection is easy
to be implemented via this pin.
The FT881 is ideally suited for buck LED drivers.
Since the FT881 operates in open loop current mode
control, the controller achieves good output current
regulation without the need for any loop
compensation. PWM dimming response is limited
only by the rate of rise and fall of the inductor current,
enabling very fast rise and fall times. The FT881
requires only three external components (apart from
the power stage) to produce a controlled LED current
making it an ideal solution for low cost LED drivers.
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DS881-A0
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FT883A-RT 功能描述:LED 驱动器 IC 1 输出 交直流离线开关 降压(降压),升压(升压) 35mA 8-SOP 制造商:fremont micro devices usa 系列:- 包装:剪切带(CT) 零件状态:有效 类型:交直流离线开关 拓扑:降压(降压),升压(升压) 内部开关:是 输出数:1 电压 - 供电(最低):9V 电压 -?供电(最高):20V 电压 - 输出:- 电流 - 输出/通道:35mA 频率:5kHz 调光:- 应用:背光 工作温度:-40°C ~ 125°C(TA) 安装类型:表面贴装 封装/外壳:8-SOIC(0.154",3.90mm 宽) 供应商器件封装:8-SOP 标准包装:1
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