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AN2823 Datasheet(PDF) 11 Page - STMicroelectronics

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

AN2823 Datasheet(HTML) 11 Page - STMicroelectronics

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AN2823
The L5973AD in LED driving applications
Doc ID 15015 Rev 1
11/33
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.
Figure 8.
Voltage mode architecture
Figure 9.
Q1 disables the switching activity clamping the COMP signal
TO DRIVE RS
VRAMP
VOUT_EA
TO DRIVE RS
VRAMP
VOUT_EA
VOUT
V
REF
E/A
PW M
OSCILLATOR R AM P
TO DRIVE RS
VRAMP
VOUT_EA
TO DRIVE RS
VRAMP
VOUT_EA
TO DRIVE RS
VRAMP
VOUT_EA
TO DRIVE RS
VRAMP
VOUT_EA
VOUT
V
REF
E/A
PW M
OSCILLATOR R AM P
V
REF
E/A
PW M
OSCILLATOR R AM P


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