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UM0670 Datasheet(PDF) 34 Page - STMicroelectronics

Part # UM0670
Description  80 W offline LED driver with PFC
PDF  43 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM0670 Datasheet(HTML) 34 Page - STMicroelectronics

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UM0670
Design features
Doc ID 15327 Rev 2
34/43
voltage on the emitter of Q102 is below the limit established by voltage divider R125
and R128 (upper limit set to 16.6 V) the transistor is opened and charges C110 and C107.
Therefore, it is possible to change the brightness between 0% and 100% on the STEVAL-
ILL013V1. The real measurement is shown in Figure 43, and it is evident that the supply
voltage on capacitor C110 is not below 12.5 V during no brightness.
Figure 42.
Design improvement allowing zero dimming
VOUT = 400 V
Vc = 16 V
Supplying PWM generator with ST7LITEU05
Supplying L6562A in modified BUCK converter
GND
L6562A
CS
Allowing
0% dimming
D104
C110
COMP
INV
C107
AM00401
R125
R126
R128
Q102
ZCD
VCC
MULT
GD



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