ICE3DS01L Datasheet, PDF (14/27 Pages) Infineon Technologies AG – Off-Line SMPS Current Mode Controller with integrated 500V Startup Cell

F3
ICE3DS01L/LG
Functional Description
blocks C12 by the gate G10. Maximum current can now
be provided to stabilize V_OUT.
V_FB
4.80V
4.00V
EnteringActive LeavingActive
Burst Mode
Burst Mode
1.32V
V_SoftS
t
Blanking Window
5.40V
4.40V
V_CS
t
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.
VCC Overvoltage
Latched Off Mode
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
Current limit level during
1.00V _{Active Burst Mode}
3.6.3.1 Latched Off Mode
CS
0.257V
V_VCC
Latched Off
Mode Reset
t
V_VCC < 6V
Spike
1
C11 Blanking
1.66V
190ns
G3
Latched
Off Mode
8.5V
I_VCC
7.2mA
1.1mA
V_OUT
Max. Ripple < 1%
Figure 17 Signals in Active Burst Mode
VCC
t
C1
21V
&
Spike
Blanking
G1
8.0us
4.8V
C4
Thermal Shutdown
Voltage
Reference
t
T_j >140°C
Control Unit
FB
Figure 18 Latched Off Mode
t ^{The VCC voltage is observed by comparator C1 if 21V}
is exceeded. The output of C1 is combined with the
output of C4 which observes FB signal if 4.8V is
Version 2.0
14
15 May 2003