JAJSG35B
August 2018 – October 2024
UCC28950
,
UCC28951
PRODUCTION DATA
1
1
特長
2
アプリケーション
3
概要
4
Pin Configuration and Functions
5
Specifications
5.1
Absolute Maximum Ratings
5.2
ESD Ratings
5.3
Recommended Operating Conditions
5.4
Thermal Information
5.5
Electrical Characteristics
5.6
Timing Requirements
5.7
Dissipation Ratings
5.8
Typical Characteristics
6
Detailed Description
6.1
Overview
6.2
Functional Block Diagram
6.3
Feature Description
6.3.1
Start-Up Protection Logic
6.3.2
Voltage Reference (VREF)
6.3.3
Error Amplifier (EA+, EA–, COMP)
6.3.4
Soft-Start and Enable (SS/EN)
6.3.5
Light-Load Power Saving Features
6.3.6
Adaptive Delay, (Delay Between OUTA and OUTB, OUTC and OUTD (DELAB, DELCD, ADEL))
6.3.7
Adaptive Delay (Delay Between OUTA and OUTF, OUTB and OUTE (DELEF, ADELEF)
6.3.8
Minimum Pulse (TMIN)
6.3.9
Burst Mode
6.3.10
Switching Frequency Setting
6.3.11
Slope Compensation (RSUM)
6.3.12
Dynamic SR ON/OFF Control (DCM Mode)
6.3.13
Current Sensing (CS)
6.3.14
Cycle-by-Cycle Current Limit Current Protection and Hiccup Mode
6.3.15
Synchronization (SYNC)
6.3.16
Outputs (OUTA, OUTB, OUTC, OUTD, OUTE, OUTF)
6.3.17
Supply Voltage (VDD)
6.3.18
Ground (GND)
6.4
Device Functional Modes
7
Application and Implementation
7.1
Application Information
7.2
Typical Application
7.2.1
Design Requirements
7.2.2
Detailed Design Procedure
7.2.2.1
Power Loss Budget
7.2.2.2
Preliminary Transformer Calculations (T1)
7.2.2.3
QA, QB, QC, QD FET Selection
7.2.2.4
Selecting LS
7.2.2.5
Selecting Diodes DB and DC
7.2.2.6
Output Inductor Selection (LOUT)
7.2.2.7
Output Capacitance (COUT)
7.2.2.8
Select FETs QE and QF
7.2.2.9
Input Capacitance (CIN)
7.2.2.10
Current Sense Network (CT, RCS, R7, DA)
7.2.2.10.1
Voltage Loop Compensation Recommendation
7.2.3
Application Curves
7.3
Power Supply Recommendations
7.4
Layout
7.4.1
Layout Guidelines
7.4.2
Layout Example
8
Device and Documentation Support
8.1
Device Support
8.1.1
Development Support
8.2
Documentation Support
8.2.1
Related Documentation
8.3
Receiving Notification of Documentation Updates
8.4
Community Resources
8.5
Trademarks
9
Revision History
10
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
jajsg35b_oa
jajsg35b_pm
5
Specifications