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UM0670 Scheda tecnica(PDF) 33 Page - STMicroelectronics

Il numero della parte UM0670
Spiegazioni elettronici  80 W offline LED driver with PFC
PDF  43 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM0670 Scheda tecnica(HTML) 33 Page - STMicroelectronics

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UM0670
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Doc ID 15327 Rev 2
Figure 40.
Proper startup using diode D104 and capacitor C110
Figure 41.
Improper startup without using diode D104 and capacitor C110
10.2
Zero dimming design implementation
During zero dimming (duty cycle is 0%) the high PF boost converter is in burst mode
because there is zero load. During this mode, capacitors C107 and C110 are charged only
in short pulses (C107 is also slightly charged via resistor from the input voltage, but it is not
enough) and therefore do not have enough energy to also supply the PWM generator and
the second L6562A controller used for the modified buck converter. The circuit shown in
Figure 42 allows brightness changes down to 0% without any problem, because if the



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