U2008B_07 Datasheet, PDF (2/13 Pages) ATMEL Corporation – Low-cost Phase-control IC with Soft Start

Figure 1-2. Block Diagram with Typical Circuit: Soft Start
230 V ~
22 kΩ/2W
BYT51K
L
Load
R₂
680 kΩ
R₁
D₁
α_max
R₈
470 kΩ
7
6
Limiting
detector
Voltage
detector
Mains voltage
compensation
Automatic
retriggering
U2008B
TIC
226
R₃
8
180Ω
1
Current
detector
Full wave load
current detector
Soft start
C₅
Soft start
4.7 µF/25V
Phase
control unit
ϕ = f(V₃)
2
3
C₃
10 nF
C₄
100 nF
-
+
Supply
voltage
limiting
Reference
voltage
Voltage
monitoring
5
-V_S
C₁
100 µF
25V
4 GND
R_{10 68 kΩ}
Set point
R₇
220 kΩ
P₁
50 kΩ
N
2 U2008B
4712C–AUTO–07/07