ZHCSI53A
May 2018 – November 2018
LM5122ZA
PRODUCTION DATA.
1
特性
2
应用
3
说明
Device Images
简化应用示意图
4
修订历史记录
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
Undervoltage Lockout (UVLO)
7.3.2
High-Voltage VCC Regulator
7.3.3
Oscillator
7.3.4
Slope Compensation
7.3.5
Error Amplifier
7.3.6
PWM Comparator
7.3.7
Soft Start
7.3.8
HO and LO Drivers
7.3.9
Bypass Operation (VOUT = VIN)
7.3.10
Cycle-by-Cycle Current Limit
7.3.11
Clock Synchronization
7.3.12
Maximum Duty Cycle
7.3.13
Thermal Protection
7.4
Device Functional Modes
7.4.1
MODE Control (Forced-PWM Mode and Diode-Emulation Mode)
7.4.2
MODE Control (Skip-Cycle Mode and Pulse-Skipping Mode)
7.4.3
Hiccup-Mode Overload Protection
7.4.4
Slave Mode and SYNCOUT
8
Application and Implementation
8.1
Application Information
8.1.1
Feedback Compensation
8.1.2
Sub-Harmonic Oscillation
8.1.3
Interleaved Boost Configuration
8.1.4
DCR Sensing
8.1.5
Output Overvoltage Protection
8.1.6
SEPIC Converter Simplified Schematic
8.1.7
Non-Isolated Synchronous Flyback Converter Simplified Schematic
8.1.8
Negative to Positive Conversion
8.2
Typical Application
8.2.1
Design Requirements
8.2.2
Detailed Design Procedure
8.2.2.1
Timing Resistor RT
8.2.2.2
UVLO Divider RUV2, RUV1
8.2.2.3
Input Inductor LIN
8.2.2.4
Current Sense Resistor RS
8.2.2.5
Current Sense Filter RCSFP, RCSFN, CCS
8.2.2.6
Slope Compensation Resistor RSLOPE
8.2.2.7
Output Capacitor COUT
8.2.2.8
Input Capacitor CIN
8.2.2.9
VIN Filter RVIN, CVIN
8.2.2.10
Bootstrap Capacitor CBST and Boost Diode DBST
8.2.2.11
VCC Capacitor CVCC
8.2.2.12
Output Voltage Divider RFB1, RFB2
8.2.2.13
Soft-Start Capacitor CSS
8.2.2.14
Restart Capacitor CRES
8.2.2.15
Low-Side Power Switch QL
8.2.2.16
High-Side Power Switch QH and Additional Parallel Schottky Diode
8.2.2.17
Snubber Components
8.2.2.18
Loop Compensation Components CCOMP, RCOMP, CHF
8.2.3
Application Curves
9
Power Supply Recommendations
10
Layout
10.1
Layout Guidelines
10.2
Layout Example
11
器件和文档支持
11.1
接收文档更新通知
11.2
社区资源
11.3
商标
11.4
静电放电警告
11.5
术语表
12
机械、封装和可订购信息
封装选项
机械数据 (封装 | 引脚)
PWP|24
MPDS372A
散热焊盘机械数据 (封装 | 引脚)
PWP|24
PPTD354
订购信息
zhcsi53a_oa
zhcsi53a_pm
6
Specifications