ICE3AR10080CJZ Datasheet, PDF (18/33 Pages) Infineon Technologies AG – Off-Line SMPS Current Mode Controller with integrated 800V CoolMOS® and Startup cell (brownout & CCM) in DIP-7

CoolSET^®-F3R80
ICE3AR10080CJZ
Functional Description
The following table lists the possible system failures
and the corresponding protection modes.
VCC Over voltage
Odd skip Auto Restart Mode
Over load
Odd skip Auto Restart Mode
Open Loop
Odd skip Auto Restart Mode
VCC Undervoltage
Normal Auto Restart Mode
Short Optocoupler
Normal Auto Restart Mode
Over temperature
Non switch Auto Restart Mode
External protection enable Latch Mode
3.7.2.1
Vcc OVP, OTP, external protection
enable and Vcc under voltage
210µs blanking
time
Latch
mode
BRL
T_LE ^0.4V
Latch
Enable
Signal
Stop
C9
gate
drive
Thermal Shutdown
VCC
25.5V
Tj >130°C
120µs blanking
C2
time
Spike
Blanking
30µs
Auto Restart
Mode Reset
VVCC < 10.5V
Auto Restart
mode
Control Unit
Voltage
Reference
mode after 210ms blanking time. The gate drive is
stopped and there is no switching pulse before it is
recovered .
The Vcc undervoltage and short opto-coupler will go
into the normal auto restart mode inherently.
In case of VCC undervoltage, the Vcc voltage drops
indefinitely. When it drops below the Vcc under voltage
lock out “OFF” voltage (10.5V), the IC will turn off the
IC and the startup cell will turn on again. Then the Vcc
voltage will be charged up to UVLO “ON” voltage (17V)
and the IC turns on again provided the startup cell
charge up current is not drained by the fault. If the fault
is not removed, the Vcc will continue to drop until it hits
UVLO “OFF” voltage and the restart cycle repeats.
Short Optocoupler can lead to Vcc undervoltage
because once the opto-coupler (transistor side) is
shorted, the feedback voltage will drop to zero and
there will be no switching pulse. Then the Vcc voltage
will drop same as the Vcc undervoltage.
3.7.2.2 Over load, open loop protection
5.0V
R_FB
FBB
C4
4.5V
40ms
Blanking
Time
Auto
Restart
Mode
Figure 28 Vcc OVP, OTP, external protection
enable
Control Unit
Vcc OVP condition is when V_VCC voltage is > 25.5V, the
IC enters into odd skip Auto Restart Mode (Figure 28).
The over temperature protection OTP is sensed inside
the controller IC. The Thermal Shutdown block keeps
on monitoring the junction temperature of the
controller. After detecting a junction temperature higher
than 130°C, the IC will enter into the non switch Auto
Restart mode. The ICE3ARxx80CJZ has also
implemented with a 50°C hysteresis. That means the
IC can only be recovered when the controller junction
temperature is dropped 50°C lower than the over
temperature trigger point (Figure 28).
The external latch enable feature can provide a
flexibility to a customer’s self-defined protection
feature. This function can be triggered by pulling down
the V_BRL voltage to < 0.4V. Or it can simply trigger the
base pin of an external transistor, T_LE at the BRL pin.
When this function is enabled, it will enter into latch
Figure 29 Over load and open loop protection
In case of Overload or Open Loop, the V_FBB voltage
exceeds 4.5V which will be observed by comparator
C4. Then the built-in blanking time counter starts to
count. When it reaches 40ms, the odd skip Auto
Restart Mode is activated (Figure 29).
3.7.3
Brownout Mode
When the AC input voltage is removed, the voltage at
the bulk capacitor will fall. When it reaches a point that
the system is greater than the system allowed
maximum power, the system may go into over load
protection. However, this kind of protection is not
expected for some of the applications such as auxiliary
power for PC/server system because the output is in
hiccup mode due to over load protection (auto restart
mode). The brownout mode is to eliminate this
phenomenon. The ICE3ARxx80CJZ will sense the
Version 2.0
18
11 Jan 2012