TIDUF84 June   2024

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 UCC28810
      2. 2.3.2 MCF8315
      3. 2.3.3 MSPM0L
      4. 2.3.4 MSPM0C
  9. 3System Design Theory
    1. 3.1 MCF8315 Design
      1. 3.1.1 Power section
      2. 3.1.2 GPIO section
    2. 3.2 ACDC Design: Single Stage PFC
    3. 3.3 Host MCU Design
  10. 4Hardware, Software, Testing Requirements, and Test Results
    1. 4.1 Hardware Requirements
      1. 4.1.1 Hardware Overview
      2. 4.1.2 TIDA-010951 PCB
    2. 4.2 Software Requirements
    3. 4.3 Testing requirements
    4. 4.4 Test Setup
    5. 4.5 Test Results
      1. 4.5.1 Power Management in TIDA-010951
      2. 4.5.2 UCC28810 Based Single Stage PFC
      3. 4.5.3 BLDC Residential Fan Operation Using MCF8315C
        1. 4.5.3.1 Power-Up Sequence
        2. 4.5.3.2 Forward Windmilling (ISD Forward Resync)
        3. 4.5.3.3 Reverse Windmilling (ISD Reverse Resync)
        4. 4.5.3.4 Direction Reversal
        5. 4.5.3.5 Fan Acceleration/Deceleration
      4. 4.5.4 Thermal Performance
  11. 5Design and Documentation Support
    1. 5.1 Design Files
      1. 5.1.1 Schematics
      2. 5.1.2 BOM
    2. 5.2 Tools and Software
    3. 5.3 Documentation Support
    4. 5.4 Support Resources
    5. 5.5 Trademarks
  12. 6About the Author
  13. 7Recognition

4.5.2 UCC28810 Based Single Stage PFC

TIDA-010951 provides a UCC288210 based secondary side regulated single stage PFC that generates an isolated 24V rail capable of delivering up to 2A. This fly-back converter can operate across (140-265) VAC RMS and provide a tightly regulated 24V while maintaining an input power factor (PF) > 0.92 and input current THD < 12.5% at 35W load (from 24V). The line, load regulation, efficiency, input PF and THD of the single stage PFC is as shown in Table 4-2.

Table 4-2 Single Stage PFC Test result in 140-265VAC

Vin (AC RMS)

PIN (W)

POUT (W)

VOUT (V)

Efficiency (%)

Input PF

Input current THD (%)

140

8.49

6

24.15

70.68

0.867

26.5

14.38

11

24.16

76.5

0.964

10.51

21.19

17

24.15

80.23

0.978

9.65

30.35

25

24.16

82.38

0.985

10.1

42

35

24.15

83.34

0.988

11.5

230

8.49

6

24.15

70.68

0.51

45.43

14.34

11

24.15

76.71

0.682

36

21.25

17

24.15

80

0.826

22.5

30.48

25

24.16

82.03

0.93

10.4

42

35

24.15

83.34

0.95

9.6

265

8.6

6

24.15

69.77

0.426

45.1

14.45

11

24.15

76.13

0.579

40.4

21.32

17

24.15

79.74

0.709

32.67

30.47

25

24.15

82.05

0.828

20.9

42.04

35

24.16

83.26

0.92

12.2

If you want to use TIDA-010951 at 85VAC-140VAC, we need to make some modifications to the PCB to achieve good PF and iTHD.

Please check following changes and test results in Table 4-2.

R14=6.8Kohm, R19=DNP, R17=0.22ohm, R18=2.2Kohm, C16=47pF, R20=18Kohm.

Table 4-3 Single Stage PFC Test result in 85-140VAC
Vin (AC RMS)PIN (W)POUT (W)VOUT (V)Efficiency (%)Input PFInput current THD (%)
858.49624.1178.90.9688.5
14.381124.1183.90.9779.4
21.191724.1184.80.9619.4
30.352524.1185.50.94911.9
423524.1185.20.94812.0
1108.49624.1178.90.9414.9
14.341124.1184.00.9649.3
21.251724.1188.60.9659.6
30.482524.1187.10.95510.8
423524.1187.00.95111.6
1408.6624.1177.90.8621.1
14.451124.183.00.94110.6
21.321724.1184.80.9529.6
30.472524.1187.00.96110.0
42.043524.1187.30.95610.5

Figure 4-4 shows the input phase current while delivering 35W (drawn from 24V rail) at 230V RMS. The input power factor is 0.95 and input current THD is 9.6%.

TIDA-010951 Input Phase Current at 230V RMS, 35W Load (Drawn From 24V Rail)Figure 4-4 Input Phase Current at 230V RMS, 35W Load (Drawn From 24V Rail)