Datasheet TPS54332 (Texas Instruments) - 7

TPS54332 www.ti.com
SLVS875C – JANUARY 2009 – REVISED NOVEMBER 2014
6.7 Typical Characteristics: Characterization Curves
120 8 VIN = 12 V EN = 0 V 110 T = 150°C J W
A
6 m 100 T = -40°C J 90 4 80 2
Rdson-OnResistance-m Isd-ShutdownCurrent-
T = 25°C J 70 60 0 -50 -25 0 25 50 75 100 125 150 3 8 13 18 23 28
T - Junction Temperature - °C V - Input Voltage - V J I Figure 1. On Resistance vs Junction Temperature Figure 2. Shutdown Quiescent Current vs Input Voltage
1020 0.824 VIN = 12 V VIN = 12 V 0.818 1010 0.812 0.806 1000 0.8
oltageReference-V
0.794
ref-V
990 0.788
V fsw-OscillatorFrequency-kHz
0.782 0.776 980 -50 -25 0 25 50 75 100 125 150 -50 -25 0 25 50 75 100 125 150
T - Junction Temperature - °C T - Junction Temperature - °C J J Figure 3. Switching Frequency vs Junction Temperature Figure 4. Voltage Reference vs Junction Temperature
14 140 VIN = 12 V 13.5 VIN = 12 V 13 130
ime-ns
12.5 120 12 11.5 110 11 10.5 100 10
onmin-MinimumControllableOnT
9.5
T Dmin-MinimumControllableDutyRatio-%
90 9 -50 -25 0 25 50 75 100 125 150 -50 -25 0 25 50 75 100 125 150
T - Junction Temperature - °C J T - Junction Temperature - °C J Figure 5. Minimum Controllable on Time vs Junction Figure 6. Minimum Controllable Duty Ratio vs Junction Temperature Temperature
Copyright © 2009–2014, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: TPS54332 Document Outline 1 Features 2 Applications 3 Description Table of Contents 4 Revision History 5 Pin Configuration and Functions 6 Specifications 6.1 Absolute Maximum Ratings 6.2 Handling Ratings 6.3 Recommended Operating Conditions 6.4 Thermal Information 6.5 Electrical Characteristics 6.6 Switching Characteristics 6.7 Typical Characteristics: Characterization Curves 6.8 Typical Characteristics: Supplemental Application Curves 7 Detailed Description 7.1 Overview 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Fixed Frequency PWM Control 7.3.2 Voltage Reference (Vref) 7.3.3 Bootstrap Voltage (BOOT) 7.3.4 Enable and Adjustable Input Undervoltage Lockout (VIN UVLO) 7.3.5 Programmable Slow-Start Using SS Pin 7.3.6 Error Amplifier 7.3.7 Slope Compensation 7.3.8 Current Mode Compensation Design 7.3.9 Overcurrent Protection and Frequency Shift 7.3.10 Overvoltage Transient Protection 7.3.11 Thermal Shutdown 7.4 Device Functional Modes 7.4.1 Operation With VIN < 3.5 V 7.4.2 Operation With EN Control 7.4.3 Eco-Mode 8 Application and Implementation 8.1 Application Information 8.2 Typical Application 8.2.1 Design Requirements 8.2.2 Detailed Design Procedure 8.2.2.1 Switching Frequency 8.2.2.2 Output Voltage Set Point 8.2.2.3 Input Capacitors 8.2.2.4 Output Filter Components 8.2.2.5 Inductor Selection 8.2.2.6 Capacitor Selection 8.2.2.7 Compensation Components 8.2.2.8 Bootstrap Capacitor 8.2.2.9 Catch Diode 8.2.2.10 Output Voltage Limitations 8.2.2.11 Power Dissipation Estimate 8.2.3 Application Curves 9 Power Supply Recommendations 10 Layout 10.1 Layout Guidelines 10.2 Layout Example 10.3 Estimated Circuit Area 10.4 Electromagnetic Interference (EMI) Considerations 11 Device and Documentation Support 11.1 Device Support 11.1.1 Development Support 11.2 Trademarks 11.3 Electrostatic Discharge Caution 11.4 Glossary 12 Mechanical, Packaging, and Orderable Information