ICE3AR2280VJZ Datasheet, PDF (20/43 Pages) Infineon Technologies AG – Of f -Line SMPS Cur rent Mode Cont rol ler wi th integrated 800V

CoolSET™ F3R80
ICE3AR2280VJZ
Functional Description
The Propagation Delay Compensation is realized by means of a dynamic threshold voltage V_csth (Figure 22). In
case of a steeper slope the switch off of the driver is earlier to compensate the delay.
V_{OSC max. Duty Cycle}
V_Sense
V_csth
off time
Propagation Delay
t
Figure 22:
Signal1
Dynamic Voltage Threshold Vcsth
Signal2
t
Similarly, the same concept of propagation delay compensation is also implemented in burst mode with reduced
level, V_{csth_burst} (Figure 18). With this implementation, the entry and exit burst mode power can be very close
between low line and high line input voltage.
3.7
Control Unit
The Control Unit contains the functions for Active Burst Mode and Auto Restart Mode. The Active Burst Mode and
the Auto Restart Mode both have 20ms internal blanking time. For the over load Auto Restart Mode, the 20ms
blanking time can be further extended by adding an external capacitor at BV pin. With the blanking time, the IC
avoids entering into those two modes accidentally. That buffer time is very useful for the application which works in
short duration of peak power occasionally.
3.7.1 Basic and Extendable Blanking Mode
5.0V
Ichg_EB
S1
4.5V
ROV2
BV
C11
# _CBK
500
C3
0.9V
S2
Auto
Restart
Mode
Counter
CT1
Spike
Blanking
30us
&
G5
FBB
C4
4.5V
20ms
Blanking
Time
Control Unit
Figure 23: Basic and Extendable Blanking Mode
There are 2 kinds of Blanking mode; basic mode and the extendable mode. The basic mode is a built-in 20ms
blanking time while the extendable mode can extend this blanking time by connecting an external capacitor to the
BV pin. For the extendable mode, the gate G5 remains blocked even though the 20ms blanking time is reached.
After reaching the 20ms blanking time the counter is activated and the switch S1 is turned on to charge the voltage
of BV pin by the constant current source, I_{chg_EB.} When the voltage of BV pin hits 4.5V, which is sensed by
Data Sheet
20
V2.1, 2013-10-22