ICE3B0365J Datasheet, PDF (13/26 Pages) Infineon Technologies AG – Off-Line SMPS Current Mode Controller with integrated 650V Startup Cell/Depletion CoolMOS™

CoolSET™-F3
ICE3Bxx65J
blocks C12 by the gate G10. Maximum current can now
be provided to stabilize V_OUT.
V_FB
4.5V
3.61V
3.0V
Entering
Active Burst
Mode
Leaving
Active Burst
Mode
1.35V
V_SoftS
t
Blanking Window
3.6.3
Protection Modes
The IC provides several protection features that
increase the SMPS system’s robustness and safety.
The following table shows the possible system failures
and the corresponding protection modes.
VCC Overvoltage
Over temperature
Overload
Open Loop
VCC Undervoltage
Short Optocoupler
Auto Restart Mode I
Auto Restart Mode I
Auto Restart Mode II
Auto Restart Mode II
Auto Restart Mode II
Auto Restart Mode II
4.0V
3.6V~
3.2V
3.0V
3.6.3.1 Auto Restart Mode I
V_CS
t
SoftS
1.0V
0.32V
Current limit level
during Active Burst
Mode
V_VCC
10.3V
I_VCC
2mA
500uA
V_OUT
Max. Ripple < 1%
Figure 15 Signals in Active Burst Mode
C3
4.0V
t
S
&
RQ
UVLO _FF2
G13
VCC
C13
&
20.5V
t
G12
C4
4.5V
Auto
Restart
Mode
Spike
Blanking
8.0us
Internal
Bias
Thermal Shutdown
T_j >140°C
Control Unit
t
FB
Figure 16 Auto Restart Mode I
The VCC voltage is observed by comparator C13 if
20.5V is exceeded. The output of C13 is combined with
both the output of C3 which checks for V_SoftS < 4.0V and
t
the output of C4 which checks for V_FB > 4.5V. Therefore
the overvoltage detection can only be active during Soft
Start Phase (V_SoftS < 4.0V) and when FB signal is
outside the operating range > 4.5V. This means any
Version 2.3
13
8 May 2006