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AN2946 Datasheet(PDF) 22 Page - STMicroelectronics

No. de pieza AN2946
Descripción Electrónicos  Solar-LED streetlight controller with 25 W LED lamp driver
PDF  38 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2946 Datasheet(HTML) 22 Page - STMicroelectronics

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Firmware design
AN2946
22/38
Doc ID 15473 Rev 2
4.1
Main loop
In the main loop in Figure 27, the parameter 'Timth3' restricts the execution time of every
loop within around 1 ms to make sure system is in steady state after changing the duty cycle
of the battery charger or LED lamp driving. A loop speed that is too fast might cause an
inaccurate value to be processed by the ADC.
Figure 27.
Main loop flowchart
EXTIth
3
Number of times that LED_Fault EXTI has been triggered
Δ
1 system clock
cycle (~28 ns)
Step of duty cycle adjustment (may not be constant)
Table 4.
Firmware reference parameters (continued)
Parameter
Value
Description



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