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AN2823 Datasheet(PDF) 22 Page - STMicroelectronics

Part # AN2823
Description  Current source for LED driving based on the L5973AD
PDF  33 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2823 Datasheet(HTML) 22 Page - STMicroelectronics

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The L5973AD in LED driving applications
AN2823
22/33
Doc ID 15015 Rev 1
Figure 20.
Q1 disables the switching activity by clamping the COMP signal
Figure 21.
Time delay in the LED current leading edge
The dimming performance of the circuit depends on the input voltage and number n of the
LED composing the row. The higher the voltage applied on the inductor (VIN-n*VLED_FW)
the higher the rising time of the LED current given the inductor value.
The minimum dimming duty cycle is determined based on the specification of the rising /
falling time of the LED current referred to the dimming time and on the dimming frequency.
AM01371v1



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