ICE3AR1580VJZ Datasheet, PDF (27/43 Pages) Infineon Technologies AG – Of f -Line SMPS Cur rent Mode Cont rol ler wi th integrated 800V

CoolSET™ F3R80
ICE3AR1580VJZ
Functional Description
C_BK
0.1uF
0.1uF
0.1uF
R_OV2
42.2KΩ
39.6KΩ
15KΩ
Extended blanking time
161ms
162ms
192ms
Overall blanking time
181ms
182ms
212ms
Another factor to affect the extended blanking time is the input voltage through the R_OV1 and R_OV2. It would, on the
contrary, reduce the extended blanking time.
3.7.4 Input OVP Mode
When the AC input voltage is out of the designed operating range (e.g. > 300Vac), the voltage at the input bulk
capacitor will increase at the same time. If the MOSFET keeps on switching, the drain voltage may be too high and
the MOSFET will exceed the maximum voltage rating and causes damages. The input OVP mode is to prevent this
phenomenon. The IC will sense the input voltage through the input bulk capacitor to the BV pin by 2 potential divider
resistors, R_OV1 and R_OV2 (Figure 32). During normal operation, the BV pin voltage is lower than V_{OVP_ref} (1.98V). The
output of C14a is low and the output of G21 is high. Together with UVLO high signal (IC operating) the “S” input of
FF5 is low. The “Q” output of FF5 is low and the input OVP mode remains not activated. When there is an input over
voltage case, the input bulk capacitor voltage is increased and the BV voltage is increased to larger than V_{OVP_ref}. The
output of C14a is high and the output of G21 is low. If the OVP persists for 400µs (blanking time) and the UVLO
signal is still high, the output of G20 is high. Then the “S” input of FF5 is high and the “Q” output of FF5 is high. The
input OVP mode is set. The case of UVLO signal low is not considered as it means the IC is not working.
Vbulk
ROV1
ROV2
UVLO
G20
S
Q
1.98V
400µs Blanking
time
G21
R
Q
FF5
C14a
BV
C14b
1.91V
Input OVP
G22
5µs Blanking
time
Control Unit
Figure 32: Input OVP detection circuit
Once the system enters the input OVP mode, there will be no switching pulse and the IC keeps on monitoring the
BV signal. If the input OVP signal is not reset, there is no switching pulse in each restart cycle (Figure 33).
VBV
Input OVP
detected
1.98V
1.91V
VVCC
17V
Input OVP
released
Switching start at the
t
following restart cycle
10.5V
VCS
t
No switching
t
Figure 33:
Input OVP mode waveform
Data Sheet
27
V2.0, 2014-01-20