Samsung S3F84A5 - Manual (Page 10)

S3F84P4_AN_REV0.00 (PRELIMINARY SPEC) 1 OVERVIEW OF HPLED LIGHTING CONTROL SYSTEM
1.3.3 CONSTANT CURRENT CONTROL
Refer to the HKP-D1W1 datasheet to see the relationship of forward voltage, forward current, and relative
luminous flux.
Figure 1-4 HKP-D1W1 Forward Voltage, Forward Current, and Relative Luminous Flux
As shown in Figure 1-4 , describing the luminous flux as a function of current is better than describing it as a
function of voltage. Even a slight change of voltage might lead to significant current shift. Therefore, constant
current control is used in HPLED applications.
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