Manuals / Texas Instruments / Computer Equipment / Power Supply

Texas Instruments TPS40003 manual SHORT CIRCUIT OPERATION 2 V/div t - Time - 1 ms/div

Models: TPS40003

1 17

Page 13

SLUU130A – September 2002 – Revised February 2003

Circuit operation with an output short circuit is shown in Figure 7. After each restart into a short circuit the pulses terminate for a period of approximately 6 ms. This causes the input power to collapse to minuscule levels, and the circuit is protected.

SHORT CIRCUIT OPERATION

2 V/div

t – Time – 1 ms/div

Figure 7.

Figure 8 shows the output voltage ripple which is approximately half the 24-mV limit.

OUTPUT VOLTAGE RIPPLE

10 mV/div

t – Time – 500 ns/div

Figure 8.

TPS40003-Based 5-A Converter in Less Than One Square Inch

Page 13

Image 13

Texas Instruments TPS40003 manual SHORT CIRCUIT OPERATION 2 V/div t - Time - 1 ms/div

Contents

TPS40003 Based 5-A Converter in Less Than One Square Inch User’s GuideUser’s Guide EVM IMPORTANT NOTICE DYNAMIC WARNINGS AND RESTRICTIONS 1 Introduction 2 FeaturesContents 1 Introduction 2 Features 3 Schematic 4 Design Procedure 5 PowerPAD Packaging 6 Test Results/Performance Data 7 PCB LayoutFigure 1. Application Diagram for the TPS40002/3 3 SchematicSLUU130A - September 2002 - Revised February TPS40003-Based 5-A Converter in Less Than One Square Inch4.1 TPS4000X Family Device Selection 4 Design Procedure4.2 Inductance Value 4.3 Input Capacitor Selection4.5 MOSFET Selection 4.4 Output Capacitor Selection4.6 Short Circuit Protection 2 p 4.7 Compensation Design2 p R R4 R510000 4.8 Snubber Component SelectionFigure 3. PowerPAD PCB Layout Guidelines 5 PowerPAD PackagingThe test setup is shown in figure 6 Test Results/Performance DataSLUU130A - September 2002 - Revised February TPS40003-Based 5-A Converter in Less Than One Square InchTypical efficiency curves are shown in Figure 5 for an input of 3.3 OUTPUT VOLTAGE RIPPLE 10 mV/div t - Time - 500 ns/div SHORT CIRCUIT OPERATION 2 V/div t - Time - 1 ms/divTRANSIENT RESPONSE 50 mV/div t - Time - 20 ∝ s/div STARTUP WAVEFORM 1 V/div 500 mV/div 500 mV/div t - Time - 200 ∝ s/divSLUU130A - September 2002 - Revised February 7 PCB LayoutTPS40003-Based 5-A Converter in Less Than One Square Inch SLUU130A - September 2002 - Revised February 8 List of Material16 TPS40003-Based 5-A Converter in Less Than One Square Inch ReferenceIMPORTANT NOTICE