JAJS472C
August 2010 – April 2018
TPS54320
PRODUCTION DATA.
1
特長
2
アプリケーション
3
概要
Device Images
概略回路図
効率と負荷電流との関係
4
改訂履歴
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
Continuous Current Mode Operation (CCM)
7.3.3
VIN and Power VIN Pins (VIN and PVIN)
7.3.4
Voltage Reference
7.3.5
Adjusting the Output Voltage
7.3.6
Safe Start-up into Prebiased Outputs
7.3.7
Error Amplifier
7.3.8
Slope Compensation
7.3.9
Enable and Adjusting UVLO
7.3.10
Slow Start (SS/TR)
7.3.11
Power Good (PWRGD)
7.3.12
Bootstrap Voltage (BOOT) and Low Dropout Operation
7.3.13
Sequencing (SS/TR)
7.3.14
Output Overvoltage Protection (OVP)
7.3.15
Overcurrent Protection
7.3.15.1
High-Side MOSFET Overcurrent Protection
7.3.15.2
Low-Side MOSFET Overcurrent Protection
7.3.16
Thermal Shutdown
7.3.17
Small Signal Model for Loop Response
7.3.18
Simple Small Signal Model for Peak Current Mode Control
7.3.19
Small Signal Model for Frequency Compensation
7.4
Device Functional Modes
7.4.1
Adjustable Switching Frequency and Synchronization (RT/CLK)
7.4.2
Adjustable Switching Frequency (RT Mode)
7.4.3
Synchronization (CLK 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
Custom Design With WEBENCH® Tools
8.2.2.2
Operating Frequency
8.2.2.3
Output Inductor Selection
8.2.2.4
Output Capacitor Selection
8.2.2.5
Input Capacitor Selection
8.2.2.6
Slow-Start Capacitor Selection
8.2.2.7
Bootstrap Capacitor Selection
8.2.2.8
UVLO Set Point
8.2.2.9
Output Voltage Feedback Resistor Selection
8.2.2.9.1
Minimum Output Voltage
8.2.2.10
Compensation Component Selection
8.2.3
Application Curves
9
Power Supply Recommendations
10
Layout
10.1
Layout Guidelines
10.2
Layout Example
11
デバイスおよびドキュメントのサポート
11.1
デバイス・サポート
11.1.1
WEBENCH®ツールによるカスタム設計
11.2
ドキュメントのサポート
11.3
商標
11.4
静電気放電に関する注意事項
11.5
Glossary
12
メカニカル、パッケージ、および注文情報
パッケージ・オプション
メカニカル・データ(パッケージ|ピン)
RHL|14
MPQF252H
サーマルパッド・メカニカル・データ
発注情報
jajs472c_oa
jajs472c_pm
8.2.3
Application Curves
Figure 35.
Load Transient
Figure 36.
Start-Up With VIN (1.1-Ω Load)
Figure 37.
Start-Up With VIN (No Load)
Figure 39.
Start-Up With EN (No Load)
Figure 41.
Start-Up and Shutdown With Prebias on EN
(1.1-Ω Load)
Figure 43.
Shutdown With EN (1.1-Ω Load)
Figure 45.
Input Voltage Ripple (1.1-Ω Load)
Figure 47.
Closed Loop Response
Figure 49.
Load Regulation
Figure 51.
Maximum Ambient Temperature vs Load Current
Figure 53.
Junction Temperature vs IC Power Dissipation
VIN = 12 V
VOUT = 3.3 V / 3 A
T
A
= Room temperature
Figure 55.
Thermal Signature of TPS54320EVM-513
Figure 38.
Start-Up With EN (1.1-Ω Load)
Figure 40.
Start-Up With Prebias on VIN (1.1-Ω Load)
Figure 42.
Shutdown With VIN (1.1-Ω Load)
Figure 44.
Output Voltage Ripple (1.1-Ω Load)
Figure 46.
Overcurrent Hiccup Mode
Figure 48.
Line Regulation
Figure 50.
Tracking Performance
Figure 52.
Maximum Ambient Temperature vs IC Power Dissipation
Figure 54.
Efficiency vs Load Current