U2008B-XFPG3Y ATMEL [ATMEL Corporation], U2008B-XFPG3Y Datasheet - Page 3

• Manufacturer Part Number: U2008B-XFPG3Y
• Description: Low-cost Phase-control IC with Soft Start
• Manufacturer: ATMEL [ATMEL Corporation]

2. Pin Configuration
Figure 2-1.
Table 2-1.
2.1
4712C–AUTO–07/07
Pin
1
2
3
4
5
6
7
8
Mains Supply, Pin 5
CONTROL
Pinning
Pin Description
OUTPUT
Symbol
ISENSE
VSYNC
GND
-VS
Cϕ
Rϕ
The integrated circuit U2008B, which also contains voltage limiting, can be connected via D
R
Pin 5, is smoothed by C
The series resistance R1 can be calculated as follows:
where:
Operation with externally stabilized DC voltage is not recommended.
R
Function
Load current sensing
Ramp voltage
Control input/compensation output
Ground
Supply voltage
Ramp current adjustment
Voltage synchronization
Trigger output
V
V
I
I
I
1
1max
tot
Smax
x
M
Smax
to the mains supply, see
=
0.85
CONTROL
×
= Mains voltage
= Maximum supply voltage
= I
= Maximum current consumption of the IC
= Current consumption of the external components
V
----------------------------- -
ISENSE
Smax
M
GND
2
–
×
C
V
I
+ I
Smax
tot
x
1
.
= Total current compensation
1
2
3
4
Figure 1-2 on page
U2008B
8
7
6
5
OUTPUT
R
-VS
2. Supply voltage, between Pin 4 (pos., ⊥) and
VSYNC
U2008B
1
and
3