JAJSHM6E
june 2019 – february 2021
UCC256402
,
UCC256403
,
UCC256404
PRODUCTION DATA
1
1
特長
2
アプリケーション
3
概要
4
Revision History
Device Comparison Table
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
Switching Characteristics
6.7
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
Hybrid Hysteretic Control
7.3.2
Regulated 13-V Supply
7.3.3
Feedback Chain
7.3.3.1
Optocoupler Feedback Signal Input and Bias
7.3.3.2
FB Pin Voltage Clamp
7.3.3.3
"Pick Lower Value" Block and Soft Start Multiplexer
7.3.3.4
Pick Higher Block and Burst Mode Multiplexer
7.3.3.5
VCR Comparators
7.3.4
Resonant Capacitor Voltage Sensing
7.3.5
Resonant Current Sensing
7.3.6
Bulk Voltage Sensing
7.3.7
Output Voltage Sensing
7.3.8
High Voltage Gate Driver
7.3.8.1
Adaptive Dead Time Control
7.3.9
Protections
7.3.9.1
ZCS Region Prevention
7.3.9.2
Over Current Protection (OCP)
7.3.9.3
Bias Winding Over Voltage Protection (BWOVP)
7.3.9.4
Input Under Voltage Protection (VINUVP)
7.3.9.5
Input Over Voltage Protection (VINOVP)
7.3.9.6
Boot UVLO
7.3.9.7
RVCC UVLO
7.3.9.8
Over Temperature Protection (OTP)
7.4
Device Functional Modes
7.4.1
High Voltage Start-Up
7.4.2
X-Capacitor Discharge
7.4.3
Burst Mode Control
7.4.3.1
Soft-Start and Burst-Mode Threshold
7.4.3.2
BMTL/BMTH Ratio Programming
7.4.4
System State Machine
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
LLC Power Stage Requirements
8.2.2.2
LLC Gain Range
8.2.2.3
Select Ln and Qe
8.2.2.4
Determine Equivalent Load Resistance
8.2.2.5
Determine Component Parameters for LLC Resonant Circuit
8.2.2.6
LLC Primary-Side Currents
8.2.2.7
LLC Secondary-Side Currents
8.2.2.8
LLC Transformer
8.2.2.9
LLC Resonant Inductor
8.2.2.10
LLC Resonant Capacitor
8.2.2.11
LLC Primary-Side MOSFETs
8.2.2.12
LLC Rectifier Diodes
8.2.2.13
LLC Output Capacitors
8.2.2.14
HV Pin Series Resistors
8.2.2.15
BLK Pin Voltage Divider
8.2.2.16
ISNS Pin Differentiator
8.2.2.17
VCR Pin Capacitor Divider
8.2.2.18
BW Pin Voltage Divider
8.2.2.19
Soft Start and Burst Mode Programming
8.2.3
Application Curves
8
Power Supply Recommendations
8.1
VCC Pin Capacitor
8.2
Boot Capacitor
8.3
RVCC Pin Capacitor
9
Layout
9.1
Layout Guidelines
9.2
Layout Example
10
Device and Documentation Support
10.1
Documentation Support
10.1.1
Related Documentation
10.2
Related Links
10.3
Receiving Notification of Documentation Updates
10.4
Community Resources
10.5
Trademarks
Mechanical, Packaging, and Orderable Information
1
特長
最適化された低消費電力モードおよびバースト・モード・アルゴリズム
ソフトオン / ソフトオフ期間付きのバースト・モード
無負荷時およびスタンバイ時の可聴ノイズを最小化
ユーザーがバースト・モードをディセーブル可能
フォトカプラの低消費電力動作
DoE Level VI および EU CoC Tier-2 外部電源規格を上回る効率性能
ハイブリッド・ヒステリシス制御 (HHC)
クラス最高の過渡応答
バースト・モードの高速終了
堅牢なアダプティブ・デッドタイム制御
ソース電流 0.6A、シンク電流 1.2A の駆動能力を備えた高電圧ゲート・ドライバ内蔵
堅牢な容量性領域 (ZCS) 回避方式
過熱、出力過電圧、入力低電圧保護、
3 レベルの過電流保護
高電圧スタートアップ機能を内蔵
アクティブ X コンデンサ放電機能