ZHCSI04E
September 2009 – April 2018
TPS54418
PRODUCTION DATA.
1
特性
2
应用
3
说明
Device Images
简化原理图
效率与输出电流间的关系
4
修订历史记录
5
Pin Configuration and Functions
Pin Functions
6
Specifications
6.1
Absolute Maximum Ratings
6.2
ESD Ratings
6.3
Recommended Operating Conditions
6.4
Thermal Information
6.5
Electrical Characteristics
6.6
Typical Characteristics
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 and Output Current
7.3.3
Bootstrap Voltage (Boot) and Low Dropout Operation
7.3.4
Error Amplifier
7.3.5
Voltage Reference
7.3.6
Adjusting the Output Voltage
7.3.7
Enable and Adjusting Undervoltage Lockout
7.3.8
Soft-Start Pin
7.3.9
Sequencing
7.3.10
Constant Switching Frequency and Timing Resistor (RT/CLK Pin)
7.3.11
Overcurrent Protection
7.3.12
Frequency Shift
7.3.13
Reverse Overcurrent Protection
7.3.14
Synchronize Using the RT/CLK Pin
7.3.15
Power Good (PWRGD Pin)
7.3.16
Overvoltage Transient Protection
7.3.17
Thermal Shutdown
7.4
Device Functional Modes
7.4.1
Small Signal Model for Loop Response
7.4.2
Simple Small Signal Model for Peak Current Mode Control
7.4.3
Small Signal Model for Frequency Compensation
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
Step One: Select the Switching Frequency
8.2.2.2
Step Two: Select the Output Inductor
8.2.2.3
Step Three: Choose the Output Capacitor
8.2.2.4
Step Four: Select the Input Capacitor
8.2.2.5
Step Five: Minimum Load DC COMP Voltage
8.2.2.6
Step Six: Choose the Soft-Start Capacitor
8.2.2.7
Step Seven: Select the Bootstrap Capacitor
8.2.2.8
Step Eight: Undervoltage Lockout Threshold
8.2.2.9
Step Nine: Select Output Voltage and Feedback Resistors
8.2.2.9.1
Output Voltage Limitations
8.2.2.10
Step 10: Select Loop Compensation Components
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
11
器件和文档支持
11.1
器件支持
11.1.1
使用 WEBENCH® 工具创建定制设计
11.1.2
开发支持
11.2
商标
11.3
静电放电警告
11.4
Glossary
12
机械、封装和可订购信息
封装选项
机械数据 (封装 | 引脚)
RTE|16
MPQF149D
散热焊盘机械数据 (封装 | 引脚)
RTE|16
QFND290G
订购信息
zhcsi04e_oa
zhcsi04e_pm
8.2.3
Application Curves
Figure 38.
Efficiency vs Load Current
2-A Current Step
Figure 40.
Transient Response
Figure 42.
Power Up V
OUT
, V
IN
Figure 44.
Power Up V
OUT
, EN
I
OUT
= 0 A
Figure 46.
Output Ripple
I
OUT
= 0 A
Figure 48.
Input Ripple
V
IN
= 3.3 V
I
OUT
= 4 A
Figure 50.
Closed Loop Response
Figure 52.
Load Regulation vs Load Current
Figure 39.
Efficiency vs Load Current
4-A Current Step
Figure 41.
Transient Response
Figure 43.
Power Down Vout, Vin
Figure 45.
Power Down V
OUT
, EN
I
OUT
= 4 A
Figure 47.
Output Ripple
I
OUT
= 4 A
Figure 49.
Input Ripple
Figure 51.
Load Regulation vs Load Current
Figure 53.
Regulation vs Input Voltage
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