ICE3RBR0665JG Datasheet, PDF (17/32 Pages) Infineon Technologies AG – Fixed-Frequency, 650V CoolSET™ in DS0-12 Package

Fixed-Frequency, 650V CoolSET™ in DS0-12 Package
Functional Description
burst flag is set after entering Active Burst Mode. In Active Burst Mode, the FB voltage is changing like a saw
tooth between 3.0 V and 3.5 V (Figure 25).
3.7.2.3
Leaving Active Burst Mode
The FB voltage will increase immediately if there is a high load jump. This is observed by the comparator C4.
Since the current limit is app. 34% during Active Burst Mode, it needs a certain load jump to rise the FB signal to
exceed 4.0 V. At that time the comparator C4 resets the Active Burst Mode control which in turn blocks the
comparator C12 by the gate G10. The maximum current can then be resumed to stabilize the VOUT.
VFB
4.0V
3.5V
3.0V
1.35V
Entering
Active Burst
Mode
Leaving Active
Burst Mode
Blanking Timer
t
20ms Blanking Time
V_CS
t
1.03V
Current limit level during
Active Burst Mode
0.34V
VVCC
t
10.5V
IVCC
t
2.5mA
450uA
V_OUT
t
t
Figure 25 Signals in Active Burst Mode
3.7.3
Protection Modes
The IC provides Auto Restart Mode as the protection feature. Auto Restart mode can prevent the SMPS from
destructive states. The following table shows the relationship between possible system failures and the
corresponding protection modes.
Data Sheet
17
Revision 1.0
2016-05-12