WT7228S中文资料LED Driver数据手册Weltrend规格书

描述 Description

The WT7228S is a current mode control LED driver IC of constant off-time operating mode. The supply voltage range is wide from 8V to 450V with an internal voltage regulation at 7.5V.
The WT7228S also has a PWM dimming control signal with a duty ratio of 0.1% - 99.9%.Besides, a linear dimming range from 0.5V to 5V is permitted to control the LED current. The WT7228S is suited for buck and boost LED drivers operated under an open-loop current-control mode. WT7228S makes a good output current regulation without the need of any loop compensation. This will effectively reduce external components.

特性 Features

●Switch mode controller for single switch LED drivers
●Open loop current controller
●Operating voltage from 8V to 450V
●Analog and PWM dimming capabilities
●Only few external components needed for operation
●Over temperature protection function
●LED shorting protection function
●Package Type:
 SOP8 with exposed pad, Green package
 SOP16 with exposed pad, Green package
【 Application
●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