Texas Instruments UCC28060EVM specifications Startup Characteristics, Brownout Protection, 350 W

www.ti.com Typical Performance Data

6.3Startup Characteristics

Figure 15 and Figure 16 illustrate the UCC28060EVM startup characteristics.

Figure 15. Start-Up at VIN = 85 VRMS, POUT =	Figure 16. Start-Up at VIN = 265 VRMS, POUT = 0
350 W	W

6.4Brownout Protection

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 VRMS. 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 VRMS Figure 18. Brownout at 265 VRMS

SLUU280B–May 2007–Revised July 2008 UCC28060EVM 300-W Interleaved PFC Pre-Regulator 9

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