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3 startup characteristics, 4 brownout protection – Texas Instruments UCC28060EVM User Manual

Page 9

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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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