ICE3BS02L Datasheet, PDF (13/21 Pages) Infineon Technologies AG – Off-Line SMPS Current Mode Controller with integrated 500V Startup Cell and Latched off Mode

F3
ICE3BS02L
Functional Description
gate G10. Maximum current can now be provided to
stabilize V_OUT.
V_FB
4.80V
4.00V
3.40V
EnteringActive LeavingActive
Burst Mode
Burst Mode
3.6.3
Protection Modes
The IC provides several protection features which are
separated into two categories. Some enter Latched Off
Mode, the others enter Auto Restart Mode. The Latched Off
Mode can only be reset if VCC is falling below 6V. Both
modes prevent the SMPS from destructive states. The
following table shows the relationship between possible
system failures and the chosen protection modes.
1.32V
V_SoftS
Blanking Window
5.40V
4.40V
V_CS
1.00V
Current limit level during
Active Burst Mode
0.257V
V_VCC
VCC Overvoltage
Latched Off Mode
t
Overtemperature
Latched Off Mode
Short Winding/Short Diode Latched Off Mode
Overload
Auto Restart Mode
Open Loop
Auto Restart Mode
VCC Undervoltage
Auto Restart Mode
Short Optocoupler
Auto Restart Mode
t
3.6.3.1 Latched Off Mode
CS
Latched Off
Mode Reset
V_VCC < 6V
t
Spike
1
C11 Blanking
Latched
1.66V
190ns
G3
Off Mode
8.5V
I_VCC
7.2mA
1.05mA
V_OUT
Max. Ripple < 1%
Figure 16 Signals in Active Burst Mode
Version 1.1
VCC
C1
t
21V
&
Spike
Blanking
G1
8.0us
4.8V
C4
Thermal Shutdown
Voltage
Reference
t
T_j >140°C
Control Unit
FB
Figure 17 Latched Off Mode
The VCC voltage is observed by comparator C1 if 21V is
t ^{exceeded. The output of C1 is combined with the output of}
C4 which observes FB signal if 4.8V is exceeded. Therefore
the overvoltage detection is only activated if the FB signal is
13
28 Sep 2005