ZHCSI27C April 2018 – October 2021 LM5036
PRODUCTION DATA
- 1 特性
- 2 應用
- 3 說明
- 4 Revision History
- 5 Pin Configuration and Functions
- 6 Specifications
-
7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3
Feature Description
- 7.3.1 High-Voltage Start-Up Regulator
- 7.3.2 Undervoltage Lockout (UVLO)
- 7.3.3 Reference Regulator
- 7.3.4 Oscillator, Synchronized Input
- 7.3.5 Voltage-Mode Control
- 7.3.6 Primary-Side Gate Driver Outputs (LSG and HSG)
- 7.3.7 Half-Bridge PWM Scheme
- 7.3.8 Maximum Duty Cycle Operation
- 7.3.9 Pre-Biased Start-Up Process
- 7.3.10 Zero Duty Cycle Operation
- 7.3.11 Enhanced Cycle-by-Cycle Current Limiting with Pulse Matching
- 7.3.12 Reverse Current Protection
- 7.3.13 CBC Threshold Accuracy
- 7.3.14 Hiccup Mode Protection
- 7.3.15 Hiccup Mode Blanking
- 7.3.16 Over-Temperature Protection (OTP)
- 7.3.17 Over-Voltage / Latch (ON_OFF Pin)
- 7.3.18 Auxiliary Constant On-Time Control
- 7.3.19 Auxiliary On-Time Generator
- 7.3.20 Auxiliary Supply Current Limiting
- 7.3.21 Auxiliary Primary Output Capacitor Ripple
- 7.3.22 Auxiliary Ripple Configuration and Control
- 7.3.23 Asynchronous Mode Operation of Auxiliary Supply
- 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 Custom Design With WEBENCH? Tools
- 8.2.2.2 Input Transient Protection
- 8.2.2.3 Level-Shift Detection Circuit
- 8.2.2.4 Applications with VIN > 100-V
- 8.2.2.5 Applications without Pre-Biased Start-Up Requirement
- 8.2.2.6 UVLO Voltage Divider Selection
- 8.2.2.7 Over Voltage, Latch (ON_OFF Pin) Voltage Divider Selection
- 8.2.2.8 SS Capacitor
- 8.2.2.9 SSSR Capacitor
- 8.2.2.10 Half-Bridge Power Stage Design
- 8.2.2.11 Current Limit
- 8.2.2.12 Auxiliary Transformer
- 8.2.2.13 Auxiliary Feedback Resistors
- 8.2.2.14 RON Resistor
- 8.2.2.15 VIN Pin Capacitor
- 8.2.2.16 Auxiliary Primary Output Capacitor
- 8.2.2.17 Auxiliary Secondary Output Capacitor
- 8.2.2.18 Auxiliary Feedback Ripple Circuit
- 8.2.2.19 Auxiliary Secondary Diode
- 8.2.2.20 VCC Diode
- 8.2.2.21 Opto-Coupler Interface
- 8.2.2.22 Full-Bridge Converter Applications
- 8.2.3 Application Curves
- 9 Power Supply Recommendations
- 10Layout
- 11Device and Documentation Support
- 12Mechanical, Packaging, and Orderable Information
3 說明
LM5036 PWM 控制器，集成了輔助偏置電源，可為工業隔離式電源應用提供高功率密度。它包含使用帶有輸入電壓前饋的電壓模式控制來實現半橋功率轉換器所需的所有功能。此控制器適合在直流輸入電壓高達 100V 的隔離式轉換器的初級側運行。此控制器包含的功能可提高功率密度和可靠性，同時降低系統成本：
- 作為輔助偏置電源的集成 Fly-Buck 轉換器。為一級和二級電路提供偏置電源，具有極少的外部組件。
- 全穩壓預偏置啟動。即使啟動到預充電輸出電容器時，也可消除輸出電壓過沖或突降。
- 具有脈沖匹配的增強型逐周期峰值電流限制。此控制器可限制正負電流。脈沖匹配可確保低側和高側器件具有相等的脈寬，以避免變壓器飽和。輸出電流限制在整個輸入電壓范圍內保持大致恒定。
器件信息
| 器件型號 | 封裝(1) | 封裝尺寸（標稱值） |
|---|---|---|
| LM5036 | WQFN (28) | 5.00mm × 5.00mm |
(1) 如需了解所有可用封裝，請參閱數據表末尾的可訂購產品附錄。
簡化版應用