ICE3RBR0665JG Datasheet, PDF (15/32 Pages) Infineon Technologies AG – Fixed-Frequency, 650V CoolSET™ in DS0-12 Package

Fixed-Frequency, 650V CoolSET™ in DS0-12 Package
Functional Description
V_{OSC max. Duty Cycle}
V_Sense
V_csth
off time
Propagation Delay
t
Signal1
Figure 22 Dynamic Voltage Threshold Vcsth
Signal2
t
3.7
Control Unit
The Control Unit contains the functions for Active Burst Mode and Auto Restart Mode. The Active Burst Mode
and the Auto Restart Mode both have 20 ms internal Blanking Time. For the Auto Restart Mode, a further
extendable Blanking Time is achieved by adding external capacitor at BA pin. By means of this Blanking Time,
the IC avoids entering into these two modes accidentally. Furthermore that buffer time for the overload
detection is very useful for the application that works in low current but requires a short duration of high
current occasionally.
3.7.1
Basic and Extendable Blanking Mode
5.0V
IBK
BA
# ^CBK
C3
4.0V
0.9V
1
S1
G2
Auto
Restart
Mode
&
Spike
G5
Blanking
8.0us
4.0V
C4
20ms
Blanking
Time
FB
C5
1.35V
20ms
Blanking
Time
&
Active
G6
Burst
Mode
Control Unit
Figure 23 Basic and Extendable Blanking Mode
There are 2 kinds of Blanking mode; basic mode and the extendable mode. The basic mode is just an internal
set 20 ms blanking time while the extendable mode has an extra blanking time by connecting an external
capacitor to the BA pin in addition to the pre-set 20 ms blanking time. For the extendable mode, the gate G5 is
blocked even though the 20 ms blanking time is reached if an external capacitor CBK is added to BA pin. While
the 20ms blanking time is passed, the switch S1 is opened by G2. Then the 0.9 V clamped voltage at BA pin is
charged to 4.0 V through the internal IBK constant current. G5 is enabled by comparator C3. After the 30 µs spike
blanking time, the Auto Restart Mode is activated.
For example, if CBK = 0.22 µF, IBK = 13 µA
Data Sheet
15
Revision 1.0
2016-05-12