ZHCSJ42 December 2018 TPS54340B
PRODUCTION DATA.
- 1 特性
- 2 應用
- 3 說明
- 4 修訂歷史記錄
- 5 Pin Configuration and Functions
- 6 Specifications
-
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 Slope Compensation Output Current
- 7.3.3 Pulse Skip Eco-mode
- 7.3.4 Low Dropout Operation and Bootstrap Voltage (BOOT)
- 7.3.5 Error Amplifier
- 7.3.6 Adjusting the Output Voltage
- 7.3.7 Enable and Adjusting Undervoltage Lockout
- 7.3.8 Internal Soft Start
- 7.3.9 Constant Switching Frequency and Timing Resistor (RT/CLK) pin)
- 7.3.10 Accurate Current Limit Operation and Maximum Switching Frequency
- 7.3.11 Synchronization to RT/CLK pin
- 7.3.12 Overvoltage Protection
- 7.3.13 Thermal Shutdown
- 7.3.14 Small Signal Model for Loop Response
- 7.3.15 Simple Small Signal Model for Peak-Current-Mode Control
- 7.3.16 Small Signal Model for Frequency Compensation
- 7.4 Device Functional Modes
-
8 Application and Implementation
- 8.1 Application Information
- 8.2
Typical Application: Buck Converter
- 8.2.1 Design Requirements
- 8.2.2
Detailed Design Procedures
- 8.2.2.1 Custom Design with WEBENCH® Tools
- 8.2.2.2 Selecting the Switching Frequency
- 8.2.2.3 Output Inductor Selection (LO)
- 8.2.2.4 Output Capacitor
- 8.2.2.5 Catch Diode
- 8.2.2.6 Input Capacitor
- 8.2.2.7 Bootstrap Capacitor Selection
- 8.2.2.8 Undervoltage Lockout Setpoint
- 8.2.2.9 Output Voltage and Feedback Resistors Selection
- 8.2.2.10 Minimum VIN
- 8.2.2.11 Compensation
- 8.2.2.12 Discontinuous Conduction Mode and Eco-mode Boundary
- 8.2.2.13 Power Dissipation
- 8.2.3 Application Curves
- 8.3 Other Applications
- 9 Power Supply Recommendations
- 10Layout
- 11器件和文檔支持
- 12機械、封裝和可訂購信息
8.2.3 Application Curves
Figure 33. Load Transient 
Figure 35. Start-up With VIN 
| IOUT = 3.5 A |
| No Load |
| IOUT = 100 mA | ||
| VIN = 12V |
| VOUT = 3.3 V | ƒsw = 600 kHz |
| VOUT = 5 V | ƒsw = 600 kHz |
| VIN = 12 V | VOUT = 3.3 V | IOUT = 3.5 A |
| VOUT = 3.3 V | IOUT = 3.5 A | ƒsw = 600 kHz |
Figure 34. Line Transient (8 V to 40 V) 
Figure 36. Start-up With EN 
| IOUT = 100 mA |
| IOUT = 3.5 A |
| VIN = 5.5 V | No Load | |
| VOUT = 5 V | EN Floating |
| VOUT = 3.3 V | ƒsw = 600 kHz |
| VOUT = 5 V | ƒsw = 600 kHz |
| VIN = 12 V | VOUT = 3.3 V | ƒsw = 600 kHz |