Weltrend | Products

LED drivers

WT7228

The WT7228 is a current mode control LED driver IC. It also can be operated in a constant frequency or constant off-time mode. The supply voltage range is wide from 20V to 450V with an internal voltage regulation at 7.5V. The minimum supply voltage can be reduced to 8.5V on special applications. The WT7228 also has a PWM dimming control signal with a duty ratio of 5% - 100% and a dimming frequency up to a few KHz. Besides, a linear dimming range from 1V to 5V is permitted to control the LED current. The WT7228 is suited for buck LED drivers and operated under an open-loop current-control mode. WT7228 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 8.5V to 450V
- Dual mode operation: constant frequency or constant off-time
- Linear and PWM dimming capabilities
- Only few external components needed for operation
- Over temperature protection function
- Package Type:
- SOP8 with exposed pad, Green package

- SOP16 with exposed pad, Green package

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