ICE3AR10080CJZ Datasheet, PDF (17/33 Pages) Infineon Technologies AG – Off-Line SMPS Current Mode Controller with integrated 800V CoolMOS® and Startup cell (brownout & CCM) in DIP-7

V_FBB
4.0V
3.5V
3.2V
V_{FB_burst}
Entering
Active Burst
Mode
Leaving
Active Burst
Mode
Blanking Timer
t
20ms Blanking Time
V_CS
t
V_csth
V_{csth_burst}
Current limit level
during Active Burst
Mode
V_VCC
t
10.5V
I_VCC
t
3.4mA
620uA
V_OUT
t
t
Figure 25 Signals in Active Burst Mode
CoolSET^®-F3R80
ICE3AR10080CJZ
Functional Description
3.7.2
Protection Modes
The IC provides Auto Restart mode as the major
protection feature. Auto Restart mode can prevent the
SMPS from destructive states. There are 3 kinds of
auto restart mode; normal auto restart mode, odd skip
auto restart mode and non switch auto restart mode.
Odd skip auto restart mode (Figure 26) is that there is
no detect of fault and no switching pulse for the odd
number restart cycle. At the even number of restart
cycle the fault detect and soft start switching pulses are
maintained. If the fault persists, it would continue the
auto-restart mode. However, if the fault is removed, it
can release to normal operation only at the even
number auto restart cycle .
V_VCC
17V
Fault
detected
No detect
Startup and detect
No detect
10.5V
V_CS
t
t
Figure 26 Odd skip auto restart waveform
Non switch auto restart mode is similar to odd skip auto
restart mode except the start up switching pulses are
also suppressed at the even number of the restart
cycle. The detection of fault still remains at the even
number of the restart cycle. When the fault is removed,
the IC will resume to normal operation at the even
number of the restart cycle (Figure 27).
V_VCC
17V
Fault
detected
No detect
Startup and detect
No detect
10.5V
V_CS
t
No switching
t
Figure 27 non switch auto restart waveform
The main purpose of the odd skip auto restart is to
extend the restart time such that the power loss during
auto restart protection can be reduced. This feature is
particularly good for smaller Vcc capacitor where the
restart time is shorter.
Version 2.0
17
11 Jan 2012