TP3

TP1

RF1FKN1WSJR-52-4R7

1mH

L1

7447462102

600V

D4MURS160-13-F

TP4

TP2

85Vac to 265Vac

22V/250mA

D2ES1J-TP

D1

1N4148W-7-F

22pFC2

10µF

35V

C1

150µF25V

C5

432kR2

1µF50V

C6

VDD1

VS2

CBC3

GND4

CS5

DRV6

HV8

U1

UCC28710D

1

34

600V

Q1STD3NK60ZD

~3

+1

~4

-2

D3RH06-T

27µF400V

C4

11.5kR3

51.1k

R1

6.8µF400V

C3

82µH

L2

301R4

1.2

R5

5.1kR6

5.1kR101

5.1kR102

1.82

R7

Current Limit@120V=290mACurrent Limit@265V=270mA

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Universal AC Input High-Side Buck Converter Reference Design

Test Report: PMP21487Universal AC Input High-Side Buck Converter ReferenceDesign

DescriptionThis reference design is a simple, low-cost, high-side buck converter to convert universal AC input voltage (85VAC to 265 VAC) to a non-isolated 22 V/250 mA DC output with a UCC28710 controller.

An IMPORTANT NOTICE at the end of this TI reference design addresses authorized use, intellectual property matters and otherimportant disclaimers and information.

Load Current (A)

Effi

cien

cy (

%)

Pow

er L

oss

(W)

0 0.05 0.1 0.15 0.2 0.25 0.30 05 0.15

10 0.315 0.4520 0.625 0.7530 0.935 1.0540 1.245 1.3550 1.555 1.6560 1.865 1.9570 2.175 2.2580 2.4

D001

120 VAC Efficiency120 VAC Power Loss265 VAC Efficiency265 VAC Power Loss

Test Prerequisites www.ti.com

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Universal AC Input High-Side Buck Converter Reference Design

1 Test Prerequisites

1.1 Voltage and Current Requirements

Table 1. Voltage and Current Requirements

PARAMETER SPECIFICATIONSVIN 85 VAC–265 VAC

VOUT 22 VIOUT 250 mA

2 Testing and Results

2.1 Efficiency GraphsFigure 1 shows the converter efficiency for a 120-V and 265-V input with a 22-V output.

Figure 1. Converter Efficiency

www.ti.com Testing and Results

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Universal AC Input High-Side Buck Converter Reference Design

2.2 Efficiency DataTable 2 and Table 3 show the efficiency data for a 120-V and 265-V input, respectively, with a 22-Voutput.

Table 2. Efficiency Data 120-V Input, 22-V Output

IOUT VOUT VIN AC IIN Arms (mA) PIN POUT Losses Efficiency0.000 21.860 120.0 8.20000 0.0000 0.00 0.00 0%0.031 21.900 120.0 25.8400 1.2100 0.68 0.53 56.1%0.053 21.900 120.0 36.210 1.7730 1.16 0.61 65.5%0.075 21.900 120.0 45.900 2.3300 1.64 0.69 70.5%0.097 21.860 120.0 55.410 2.9100 2.12 0.79 72.9%0.118 21.860 120.0 65.000 3.4700 2.58 0.89 74.3%0.140 21.860 120.0 74.140 4.0560 3.06 1.00 75.5%0.183 21.880 120.0 92.110 5.2100 4.00 1.21 76.9%0.205 21.900 120.0 100.000 5.7970 4.49 1.31 77.4%0.226 21.900 120.0 108.600 6.3570 4.95 1.41 77.9%0.248 21.940 120.0 117.200 6.9510 5.44 1.51 78.3%

Table 3. Efficiency Data 265-V Input, 22-V Output

IOUT VOUT VIN AC IIN Arms (mA) PIN POUT Losses Efficiency0.000 21.860 265.0 5.30000 0.0000 0.00 0.00 0%0.031 21.870 265.0 14.5500 1.2770 0.68 0.60 53.1%0.053 21.930 265.0 21.100 1.9000 1.16 0.74 61.2%0.075 21.900 265.0 26.600 2.5150 1.64 0.87 65.3%0.097 21.880 265.0 32.160 3.0880 2.12 0.97 68.7%0.118 21.870 265.0 37.460 3.6000 2.58 1.02 71.7%0.140 21.870 265.0 42.600 4.1800 3.06 1.12 73.2%0.183 21.880 265.0 52.980 5.3680 4.00 1.36 74.6%0.205 21.880 265.0 57.800 5.8720 4.49 1.39 76.4%0.226 21.890 265.0 62.800 6.4770 4.95 1.53 76.4%0.248 21.900 265.0 67.990 7.0900 5.43 1.66 76.6%

Testing and Results www.ti.com

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Universal AC Input High-Side Buck Converter Reference Design

2.3 Thermal ImagesThe thermal image in Figure 2 shows operation at a 120-V input and 22-V at 250-mA output, with noairflow. The board ran for 20 minutes with these conditions before the thermal image was taken.

Figure 2. Thermal Image

2.4 DimensionsFigure 3 illustrates the PMP21487 board.

Figure 3. PMP21487 Board (Top View)

www.ti.com Waveforms

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Universal AC Input High-Side Buck Converter Reference Design

3 Waveforms

3.1 SwitchingFigure 4 shows the switch node voltage with an input voltage of 120 V and the 22-V output loaded to250 mA.

Figure 4. Switch Node Voltage, VIN = 120 V, 22-V VOUT = 250-mA Load

Figure 5 shows the switch node voltage with an input voltage of 265 V and the 22-V output loaded to250 mA.

Figure 5. Switch Node Voltage, VIN = 265 V, 22-V VOUT = 250-mA Load

Waveforms www.ti.com

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Universal AC Input High-Side Buck Converter Reference Design

3.2 Output Voltage RippleFigure 6 shows the output ripple voltage with an input voltage of 120 V and the 22-V output loaded to0 mA.

Figure 6. Output Voltage Ripple, VIN = 120 VAC, 22-V VOUT = 0-mA Load

Figure 7 shows the output ripple voltage with an input voltage of 120 V and the 22-V output loaded to250 mA.

Figure 7. Output Voltage Ripple, VIN = 120 VAC, 22-V VOUT = 250-mA Load

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Universal AC Input High-Side Buck Converter Reference Design

Figure 8 shows the output ripple voltage with an input voltage of 265 V and the 22-V output loaded to0 mA.

Figure 8. Output Voltage Ripple, VIN = 265 VAC, 22-V VOUT = 0-mA Load

Figure 9 shows the output ripple voltage with an input voltage of 265 V and the 22-V output loaded to250 mA.

Figure 9. Output Voltage Ripple, VIN = 265 VAC, 22-V VOUT = 250-mA Load

Waveforms www.ti.com

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Universal AC Input High-Side Buck Converter Reference Design

3.3 Start-Up SequenceFigure 10 shows the output voltage startup waveform after the application of 120 V in with the 22-V outputloaded to 0 A.

Figure 10. Output Voltage Startup Waveform, VIN = 120 V, 22-V VOUT = 0-mA Load

Figure 11 shows the output voltage startup waveform after the application of 120 V in with the 22-V outputloaded to 250 A.

Figure 11. Output Voltage Startup Waveform, VIN = 120 V, 22-V VOUT = 250-mA Load

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Universal AC Input High-Side Buck Converter Reference Design

Figure 12 shows the output voltage startup waveform after the application of 265 V in with the 22-V outputloaded to 0 A.

Figure 12. Output Voltage Startup Waveform, VIN = 265 V, 22-V VOUT = 0-mA Load

Figure 13 shows the output voltage startup waveform after the application of 265 V in with the 22-V outputloaded to 250 A.

Figure 13. Output Voltage Startup Waveform, VIN = 265 V, 22-V VOUT = 250-mA Load

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