Note (2) At 20k Hz PWM control frequency，duty ratio range is restricted from 20% to 100%.

Note (3) The lifetime of LED is estimated data and defined as the time when it continues

to operate under the conditions at

Ta = 25 ±2 ℃ and Duty 100% until the brightness

becomes ≦

50% of its original value. Operating LED under high temperature

environment will reduce life time and lead to color shift.

Power sequence and control signal timing are shown in the following figure

Note： While system is turned ON or OFF, the power sequences must follow as

below descriptions Turn ON sequence: Vi(+12V) → EN → Dimming

Turn OFF sequence: Dimming → EN → Vi(+12V)

Note (4)

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