JAJSG35A
august 2018 – december 2021
UCC28951
PRODUCTION DATA
1
1
特長
2
アプリケーション
3
概要
4
Revision History
5
Pin Configuration and 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
Timing Requirements
6.7
Dissipation Ratings
6.8
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
Start-Up Protection Logic
7.3.2
Voltage Reference (VREF)
7.3.3
Error Amplifier (EA+, EA–, COMP)
7.3.4
Soft-Start and Enable (SS/EN)
7.3.5
Light-Load Power Saving Features
7.3.6
Adaptive Delay, (Delay Between OUTA and OUTB, OUTC and OUTD (DELAB, DELCD, ADEL))
7.3.7
Adaptive Delay (Delay Between OUTA and OUTF, OUTB and OUTE (DELEF, ADELEF)
7.3.8
Minimum Pulse (TMIN)
7.3.9
Burst Mode
7.3.10
Switching Frequency Setting
7.3.11
Slope Compensation (RSUM)
7.3.12
Dynamic SR ON/OFF Control (DCM Mode)
7.3.13
Current Sensing (CS)
7.3.14
Cycle-by-Cycle Current Limit Current Protection and Hiccup Mode
7.3.15
Synchronization (SYNC)
7.3.16
Outputs (OUTA, OUTB, OUTC, OUTD, OUTE, OUTF)
7.3.17
Supply Voltage (VDD)
7.3.18
Ground (GND)
7.4
Device Functional Modes
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
Power Loss Budget
8.2.2.2
Preliminary Transformer Calculations (T1)
8.2.2.3
QA, QB, QC, QD FET Selection
8.2.2.4
Selecting LS
8.2.2.5
Selecting Diodes DB and DC
8.2.2.6
Output Inductor Selection (LOUT)
8.2.2.7
Output Capacitance (COUT)
8.2.2.8
Select FETs QE and QF
8.2.2.9
Input Capacitance (CIN)
8.2.2.10
Current Sense Network (CT, RCS, R7, DA)
8.2.2.10.1
Voltage Loop Compensation Recommendation
8.2.3
Application Curves
9
Power Supply Recommendations
10
Layout
10.1
Layout Guidelines
10.2
Layout Example
11
Device and Documentation Support
11.1
Device Support
11.1.1
Development Support
11.2
Documentation Support
11.2.1
Related Documentation
11.3
Receiving Notification of Documentation Updates
11.4
Community Resources
11.5
Trademarks
Mechanical, Packaging, and Orderable Information
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)
PW|24
MPDS363A
サーマルパッド・メカニカル・データ
発注情報
jajsg35a_oa
jajsg35a_pm
10
Layout