VIPER22A-E STMicroelectronics, VIPER22A-E Datasheet - Page 10

• Manufacturer Part Number: VIPER22A-E
• Description: Fixed frequency off line converter
• Manufacturer: STMicroelectronics

Specifications of VIPER22A-E

• Constant Current Output: 350 mA, 700 mA, 1.05 A (selectable)
• Input Voltage Range: 90 to 264 VAC 50/60 Hz

Operations
10/21
Figure 6.
It is then possible to build the total DC transfer function between I
Figure 6 on page 10
associated minimum turn on time. This imposes a minimum drain current under which the
device is no more able to control it in a linear way. This drain current depends on the primary
inductance value of the transformer and the input voltage. Two cases may occur, depending
on the value of this current versus the fixed 85 mA value, as described above.
I
FB
transfer function
. This figure also takes into account the internal blanking time and its
t
---------------------------------------- -
t
---------------------------------------- -
ONmin
ONmin
L
L
85mA
⋅
⋅
V
V
1
2
I
IN
IN
Doc ID 12050 Rev 2
Dpeak
0
I
Dlim
VIPer22A-E, VIPer22ADIP-E, VIPer22AS-E
I
FBsd
Part
threshold
masked
by
D
the
and I
I
I
FBsd
FB
FB
as shown on