ICE3RBR0665JG Datasheet, PDF (6/32 Pages) Infineon Technologies AG – Fixed-Frequency, 650V CoolSET™ in DS0-12 Package

Fixed-Frequency, 650V CoolSET™ in DS0-12 Package
Functional Description
3.2
Power Management
Drain
VCC
Startup Cell
Depl. CoolMOS™
Power Management
Internal Bias
Undervoltage Lockout
18V
10.5V
Power-Down Reset
Soft Start block
Voltage
5.0V
Reference
Auto Restart
Mode
Active Burst Mode
Figure 4 Power Management
The Undervoltage Lockout monitors the external supply voltage VVCC. When the SMPS is plugged to the main
line the internal Startup Cell is biased and starts to charge the external capacitor CVCC which is connected to the
VCC pin. This VCC charge current is controlled to 0.9 mA by the Startup Cell. When the VVCC exceeds the on-
threshold VVCCon=18 V the bias circuit are switched on. Then the Startup Cell is switched off by the Undervoltage
Lockout and therefore no power losses present due to the connection of the Startup Cell to the Drain voltage.
To avoid uncontrolled ringing at switch-on, a hysteresis start up voltage is implemented. The switch-off of the
controller can only take place when VVCC falls below 10.5 V after normal operation was entered. The maximum
current consumption before the controller is activated is about 150 mA.
When VVCC falls below the off-threshold VVCCoff=10.5 V, the bias circuit is switched off and the soft start counter is
reset. Thus it is ensured that at every startup cycle the soft start starts at zero.
The internal bias circuit is switched off if Auto Restart Mode is entered. The current consumption is then
reduced to 150mA.
Once the malfunction condition is removed, this block will then turn back on. The recovery from Auto Restart
Mode does not require re-cycling the AC line.
When Active Burst Mode is entered, the internal Bias is switched off most of the time but the Voltage Reference
is kept alive in order to reduce the current consumption below 450 µA.
Data Sheet
6
Revision 1.0
2016-05-12