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Texas Instruments UCC2891 manual Bottom Signal Trace Layer, Bottom Side Component Assembly

Models: UCC2891

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EVM Assembly Drawing and Layout

Figure 19. Bottom Signal Trace Layer

Figure 20. Bottom Side Component Assembly

Using the UCC2891 Active Clamp Current Mode PWM Controller

SLUU178A –November 2003 –Revised December 2006

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Texas Instruments UCC2891 manual Bottom Signal Trace Layer, Bottom Side Component Assembly, EVM Assembly Drawing and Layout

Contents

Power Supply MAN Users GuideDecember SLUU178AUsers Guide 48-V to 3.3-V Forward Converter with Active1 Introduction 2 DescriptionUsing the UCC2891 Active Clamp Current Mode PWM Controller Users Guide2.2 Features 2.1 Applications4 Schematic 3 UCC2891EVM Electrical Performance SpecificationsTable 1. UCC2891EVM Performance Summary Figure 1. UCC2891EVM Schematic SchematicUsing the UCC2891 Active Clamp Current Mode PWM Controller Submit Documentation FeedbackFigure 2. Recommended EVM Test Configuration 5 EVM Test SetupDANGER HIGH VOLTAGE 5.4 Recommended Wire Guage 5.1 Output Load LOAD15.2 DC Input Source VIN 5.3 Network Analyzer6 Power Up/Down Test Procedures 7 Power Up/Down Test Procedures Power Up/Down Test ProceduresPOWER LOSS vs OUTPUT CURRENT Using the UCC2891 Active Clamp Current Mode PWM ControllerPower Up/Down Test Procedures Using the UCC2891 Active Clamp Current Mode PWM ControllerInput Ripple Voltage Output Ripple VoltagePower Up/Down Test Procedures 12 Using the UCC2891 Active Clamp Current Mode PWM ControllerOutput Ripple Voltage Transformer Primary8 EVM Assembly Drawing and Layout Figure 14. Top Side Component AssemblyFigure 15. Top Side Silk Screen Figure 16. Top Signal Trace Layer EVM Assembly Drawing and LayoutUsing the UCC2891 Active Clamp Current Mode PWM Controller Submit Documentation FeedbackFigure 18. Internal Signal Trace Layer Figure 17. Internal Split Ground PlaneEVM Assembly Drawing and Layout Using the UCC2891 Active Clamp Current Mode PWM ControllerFigure 19. Bottom Signal Trace Layer Figure 20. Bottom Side Component AssemblyEVM Assembly Drawing and Layout Using the UCC2891 Active Clamp Current Mode PWM Controller9 List of Materials Table 2. List of MaterialsUsing the UCC2891 Active Clamp Current Mode PWM Controller List of Materials10 References Table 2. List of Materials continuedEVM IMPORTANT NOTICE DYNAMIC WARNINGS AND RESTRICTIONS