Texas Instruments UCC38500EVM manual 1.4 DM38500 EVM Performance, 2. DM38500 EVM Efficiency

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1.4 DM38500 EVM Performance

DM38500 EVM Performance

1.4 DM38500 EVM Performance

Figure 1−2 through 1−4 shows the typical evaluation module performance.

Figure 1−2. DM38500 EVM Efficiency

 

 

 

UCC38500 EFFICIENCY

 

 

 

 

 

 

 

 

vs

 

 

 

 

 

 

90

 

 

OUTPUT POWER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

85

 

VIN = 265 V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

80

 

 

 

 

 

 

 

 

 

−%

75

 

 

 

 

 

 

VIN = 175 V

 

 

 

 

 

 

 

 

 

 

 

Efficiency

70

 

 

 

VIN = 85 V

 

 

 

 

 

 

 

 

 

 

 

 

65

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

60

 

 

 

 

 

 

 

 

 

 

55

 

 

 

 

 

 

 

 

 

 

50

 

 

 

 

 

 

 

 

 

 

10

20

30

40

50

60

70

80

90

100

 

 

 

 

 

POUT − W

 

 

 

 

Figure 1−3. DM38500 Power Factor

UCC38500 PF

vs

OUTPUT POWER

 

1.00

 

 

 

 

 

 

 

 

 

Factor

0.95

 

 

 

VIN = 85 V

 

VIN = 265 V

 

 

 

 

 

 

 

 

 

 

 

VIN = 175 V

 

 

 

 

 

Power

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.90

 

 

 

 

 

 

 

 

 

 

0.85

 

30

40

50

60

70

80

90

100

 

10

20

 

 

 

 

 

POUT − W

 

 

 

 

General Information

1-5

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Contents SLUU068C Using the UCC38500EVMUser’s Guide February Using the UCC38500Power Management Products User’s GuideIMPORTANT NOTICE EVM IMPORTANT NOTICE EVM WARNINGS AND RESTRICTIONS 1.3.4 Additional Information 1.4 DM38500 EVM Performance Contents1−1. DM38500 Evaluation Module Application Schematic 1.3.3 Step 3. Evaluating the Demonstration’s Boards PerformanceTopic General InformationChapter Page1.2 Description 1.1 FeaturesJ Controls Boost Preregulator to Near-unity Power Factor J Accurate Power Limiting J Improved Feedforward Line Regulation1.3.3 Step 3. Evaluating the Demonstration’s Boards Performance 1.3.2 Step 2. Applying Input Power1.3 Operating Guidelines 1.3.1 Step 1. Load ConnectionsEVM Warnings and High-Temperature componentHigh-Voltage component. See See EVM WarningsFigure 1−2. DM38500 EVM Efficiency Figure 1−3. DM38500 Power Factor1.4 DM38500 EVM Performance V IN = 265 Figure 1−4. DM38500 Total Harmonic DistortionDistortion TotalDM38500 Board Layouts ReferenceDM38500 EVM Part Descriptions Table 2−1. DM38500 Part Descriptions 2.1 DM38500 EVM Part DescriptionsValue/Type Number 2 Unless otherwise specified, all resistors have a tolerance of ±1%3 Capacitor C38 is located at reference designator R38 on the PCB Description2.2 DM38500 Board Layouts Figure 2−1. DM38500 EVM PC Board Top Assembly