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ICE3AS02G Datasheet(PDF) 14 Page - Infineon Technologies AG

Part # ICE3AS02G
Description  Off-Line SMPS Current Mode Controller with integrated 500V Startup Cell
PDF  22 Pages
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Manufacturer  INFINEON [Infineon Technologies AG]
Direct Link  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

ICE3AS02G Datasheet(HTML) 14 Page - Infineon Technologies AG

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ICE3AS02 / ICE3AS02G / ICE3BS02 / ICE3BS02G
Functional Description
Version 1.2
14
02 Sep 2005
gate G10. Maximum current can now be provided to
stabilize VOUT.
Figure 17
Signals in Active Burst Mode
3.6.3
Protection Mode (Auto Restart Mode)
In order to increase the SMPS system’s robustness and
safety, the IC provides the Auto Restart Mode as a protection
feature. The Auto Restart Mode is entered upon detection of
the following faults in the system:
• VCC Overvoltage
• Overtemperature
•Overload
• Open Loop
• VCC Undervoltage
• Short Optocoupler
Figure 18
Auto Restart Mode
The VCC voltage is observed by comparator C1 if 17V is
exceeded. The output of C1 is combined with both the output
of C11 which checks for SoftS<4.0V, and the output of C4
which checks for FB>4.8V. Therefore the overvoltage
detection
is
can
only
active
during
Soft
Start
Phase(SoftS<4.0V) and when FB signal is outside the
operating range > 4.8V. This means any small voltage
overshoots of VVCC during normal operating cannot trigger
the Auto Restart Mode.
In order to ensure system reliability and prevent any false
activation, a blanking time is implemented before the IC can
enter into the Auto Restart Mode. The output of the VCC
overvoltage detection is fed into a spike blanking with a time
constant of 8.0
µs.
The other fault detection which can result in the Auto Restart
Mode and has this 8.0
µs blanking time is the
Overtemperature detection. This block checks for a junction
temperature of higher than 140°C for malfunction operation.
1.32V
4.00V
4.80V
V
FB
4.40V
5.40V
V
SoftS
t
t
0.257V
1.00V
V
CS
8.5V
V
VCC
t
t
1.05mA
I
VCC
t
7.2mA
V
OUT
t
Max. Ripple<1%
BlankingWindow
Current limit level during
ActiveBurst Mode
3.40V
EnteringActive
Burst Mode
LeavingActive
Burst Mode
C11
C1
17V
C
SoftS
C3
5.4V
C4
4.8V
R
SoftS
Auto Restart
Mode
&
G5
&
G1
Thermal Shutdown
T
j >140°C
4.4V
S1
6.5V
VCC
Control Unit
5k
4.0V
SoftS
FB
Voltage
Reference
Spike
Blanking
8.0us



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