SLUAAD0 Application note | 德州仪器 TI.com.cn

SLUAAD0 September 2021 UCC28064A

4.5 Test result for External Paralleling two power stages control circuit of UCC28064A

Figure 4-4 shows setting external circuit components value for optimizing 4-phase control with UCC28064A (Primary) and UCC28064A (Secondary). Testing power rating is PIN 1.5 kW and VINAC range is from 90 VAC to 264 V_AC

Figure 4-4 External Circuit for Paralleling Two-Power Stages Operating with Two UCC28064A (Additional Detail)

* Adjustable voltage range 3.0V ~5V in the Blue square dotted line

Table 4-1 shows measuring current level value of load sharing multi- phase operating depends on input power rating conditions.

Table 4-1 Measuring Load Sharing Regulation and Current Primary and Secondary

Input Power(W)	100W	300W	500W	800W	1000W	1500W
Output Current (A)	0.244	0.744	1.243	1.986	2.484	3.75
Primary Output Diode Current(A)	0.134	0.373	0.619	0.99	1.243	1.85
Secondary Output Diode Current (A)	0.11	0.371	0.623	0.996	1.241	1.9
Load Share Regulation (%)	9.84%	0.27%	0.4%	0.3%	0.08%	1.33%

Figure 4-5 waveforms show how well the paralleled TM PFC stages shared currents at different power levels.

Figure 4-5 Waveform of Multi-operating (100W)

Figure 4-7 Waveform of Multi-operating (500W)

Figure 4-9 Waveform of Multi-operating (1000W)

Figure 4-6 Waveform of Multi-operating (300W)

Figure 4-8 Waveform of Multi-operating (800W)

Figure 4-10 Waveform of Multi-operating (1500W)

Figure 4-11 shows how well the paralleled TM Interleaved PFC boost stages share current from a 100 W to 1500W loading.

Figure 4-11 Comparison Variation Current and Power Rating