ICE3AR0680JZ Datasheet, PDF (17/34 Pages) Infineon Technologies AG – Of f -Line SMPS Cur rent Mode Cont rol ler wi th integrated 800V

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
CoolSET^®-F3R80
ICE3AR0680JZ
Functional Description
detect and soft start switching pulses 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 (Figure 27).
V_VCC
17V
Fault
detected
No detect
Startup and detect
No detect
10.5V
V_CS
t
V_CS
V_csth
V_{csth_burst}
Current limit level
during Active Burst
Mode
V_VCC
t
t
Figure 27 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
t
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 28).
10.5V
I_VCC
5.7mA
t
V_VCC
Fault
detected
No detect
Startup and detect
No detect
17V
620uA
V_OUT
10.5V
V_CS
t
t
No switching
t
Figure 26 Signals in Active Burst Mode
t
Figure 28 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.
3.7.3
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 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
The following table lists the possible system failures
and the corresponding protection modes.
VCC Over voltage (1)
Odd skip Auto Restart Mode
VCC Over voltage (2)
Odd skip Auto Restart Mode
Over load
Odd skip Auto Restart Mode
Open Loop
Odd skip Auto Restart Mode
Version 2.1a
17
11 Jan 2012