1A led driver powers 15 in a string

Recom’s RCDE-48 series LED drivers can handle inputs up to 60Vdc and deliver up to 1.05A constant current output with analog or PWM dimming. Other output options are 350mA and 700mA, and all types can drive strings of up to 15 high brightness LEDs and are up to 97% efficient (all versions, 48V in 45Vout 25°C ambient). ...

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