6.3
Startup Characteristics
6.4
Brownout Protection
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Typical Performance Data
Figure 15
and
Figure 16
illustrate the UCC28060EVM startup characteristics.
Figure 15. Start-Up at V
IN
= 85 V
RMS
, P
OUT
=
Figure 16. Start-Up at V
IN
= 265 V
RMS
, P
OUT
= 0
350 W
W
The UCC28060 has a brownout protection that shuts down both gate drives (GDA and GDB) when the
VINAC pin detects that the RMS input voltage is too low. This EVM was designed to go into a brownout
state when the line drops below 64 V
RMS
. Once the UCC28060 control device has determined that the
input is in a brownout condition, a 400-ms timer starts to allow the line to recover before shutting down the
gate drivers. After 400 ms of brownout, both gate drivers turn off, as shown in
Figure 17
and
Figure 18
.
Figure 17. Brownout at 85 V
RMS
Figure 18. Brownout at 265 V
RMS
SLUU280B – May 2007 – Revised July 2008
UCC28060EVM 300-W Interleaved PFC Pre-Regulator
9
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