WT7228S
【 General 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. |
【 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 |