ICE3RBR0665JG Datasheet, PDF (19/32 Pages) Infineon Technologies AG – Fixed-Frequency, 650V CoolSET™ in DS0-12 Package

Fixed-Frequency, 650V CoolSET™ in DS0-12 Package
Functional Description
achieved by adding an external capacitor, CBK. A constant current source of IBK will start to charge the capacitor
CBK from 0.9 V to 4.0 V after the switch S1 is released. The charging time from 0.9 V to 4.0 V are the extendable
blanking time. If CBK is 0.22 µF and IBK is 13 µA, the extendable blanking time is around 52 ms and the total
blanking time is 72 ms. In combining the FB and blanking time, there is a blanking window generated which
prevents the system to enter Auto Restart Mode due to large load jumps.
3.7.3.2
Auto Restart mode without extended blanking time
Auto-restart ^BA
Enable
Signal
0.33V ^C9
TAE
25.5V
VCC ^C2
softs_period
VCC
C1
20.5V
4.0V
C4
FB
1ms
counter
8us
Blanking
Time
120us
Blanking
Time
UVLO
Stop
gate
drive
Auto Restart
Mode Reset
VVCC < 10.5V
Auto Restart
mode
Spike
&
Blanking
30us
G1
Voltage
Reference
Thermal Shutdown
Tj >130°C
Control Unit
Figure 27 Over load, open loop protection
There are 2 modes of VCC overvoltage protection; one is during soft start and the other is at all conditions.
The first one is VVCC voltage is > 20.5 V and FB is > 4.0 V and during soft start period and the IC enters Auto Restart
Mode. The VCC voltage is observed by comparator C1 and C4. The fault conditions are to detect the abnormal
operating during start up such as open loop during light load start up, etc. The logic can eliminate the possible
of entering Auto Restart mode if there is a small voltage overshoots of VVCC during normal operating.
The 2nd one is VVCC >25.5 V and last for 120 µs and the IC enters Auto Restart Mode. This 25.5 V VCC OVP
protection is inactivated during burst mode.
The Thermal Shutdown block monitors the junction temperature of the IC. After detecting a junction
temperature higher than 130 °C, the Auto Restart Mode is entered.
In case the pre-defined auto-restart features are not sufficient, there is a customer defined external Auto-restart
Enable feature. This function can be triggered by pulling down the BA pin to < 0.33 V. It can simply add a trigger
signal to the base of the externally added transistor, TAE at the BA pin. When the function is enabled, the gate
drive switching will be stopped and then the IC will enter auto-restart mode if the signal persists. To ensure this
auto-restart function will not be mis-triggered during start up, a 1 ms delay time is implemented to blank the
unstable signal.
VCC undervoltage is the VCC voltage drop below Vcc turn off threshold. Then the IC will turn off and the start up
cell will turn on automatically. And this leads to Auto Restart Mode.
Short Optocoupler also leads to VCC undervoltage as there is no self supply after activating the internal
reference and bias.
Data Sheet
19
Revision 1.0
2016-05-12