ZHCSH21A
October 2017 – February 2018
UCC28780
PRODUCTION DATA.
1
特性
2
应用
3
说明
Device Images
简化原理图
45W、20V GaN-ACF 适配器效率
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 of SOIC
6.5
Thermal Information of WQFN
6.6
Electrical Characteristics
6.7
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Detailed Pin Description
7.3.1
BUR Pin (Programmable Burst Mode)
7.3.2
FB Pin (Feedback Pin)
7.3.3
VDD Pin (Device Bias Supply)
7.3.4
REF Pin (Internal 5-V Bias)
7.3.5
HVG and SWS Pins
7.3.6
RTZ Pin (Sets Delay for Transition Time to Zero)
7.3.7
RDM Pin (Sets Synthesized Demagnetization Time for ZVS Tuning)
7.3.8
RUN Pin (Driver Enable Pin)
7.3.9
SET Pin
7.4
Device Functional Modes
7.4.1
Adaptive ZVS Control with Auto-Tuning
7.4.2
Dead-Time Optimization
7.4.3
Control Law across Entire Load Range
7.4.4
Adaptive Amplitude Modulation (AAM)
7.4.5
Adaptive Burst Mode (ABM)
7.4.6
Low Power Mode (LPM)
7.4.7
Standby Power Mode (SBP)
7.4.8
Startup Sequence
7.4.9
Survival Mode of VDD
7.4.10
System Fault Protections
7.4.10.1
Brown-In and Brown-Out
7.4.10.2
Output Over-Voltage Protection
7.4.10.3
Over-Temperature Protection
7.4.10.4
Programmable Over-Power Protection
7.4.10.5
Peak Current Limit
7.4.10.6
Output Short-Circuit Protection
7.4.10.7
Over-Current Protection
7.4.10.8
Thermal Shutdown
7.4.11
Pin Open/Short Protections
7.4.11.1
Protections on CS pin Fault
7.4.11.2
Protections on HVG pin Fault
7.4.11.3
Protections on RDM and RTZ pin Faults
8
Application and Implementation
8.1
Application Information
8.2
Typical Application Circuit
8.2.1
Design Requirements
8.2.2
Detailed Design Procedure
8.2.2.1
Input Bulk Capacitance and Minimum Bulk Voltage
8.2.2.2
Transformer Calculations
8.2.2.2.1
Primary-to-Secondary Turns Ratio (NPS)
8.2.2.2.2
Primary Magnetizing Inductance (LM)
8.2.2.2.3
Primary Turns (NP)
8.2.2.2.4
Secondary Turns (NS)
8.2.2.2.5
Turns of Auxiliary Winding (NA)
8.2.2.2.6
Winding and Magnetic Core Materials
8.2.2.3
Clamp Capacitor Calculation
8.2.2.4
Bleed-Resistor Calculation
8.2.2.5
Output Filter Calculation
8.2.2.6
Calculation of ZVS Sensing Network
8.2.2.7
Calculation of Compensation Network
8.2.3
Application Curves
9
Power Supply Recommendations
10
Layout
10.1
Layout Guidelines
10.1.1
General Considerations
10.1.2
RDM and RTZ Pins
10.1.3
SWS Pin
10.1.4
VS Pin
10.1.5
BUR Pin
10.1.6
FB Pin
10.1.7
CS Pin
10.1.8
GND Pin
10.2
Layout Example
11
器件和文档支持
11.1
文档支持
11.1.1
相关文档
11.2
接收文档更新通知
11.3
社区资源
11.4
商标
11.5
静电放电警告
11.6
Glossary
12
机械、封装和可订购信息
封装选项
请参考 PDF 数据表获取器件具体的封装图。
机械数据 (封装 | 引脚)
D|16
RTE|16
散热焊盘机械数据 (封装 | 引脚)
RTE|16
QFND525B
订购信息
zhcsh21a_oa
zhcsh21a_pm
1
特性
通过自适应控制对初级 FET 进行完全和部分零电压开关 (ZVS)
外部硅或氮化镓 FET 可编程时序
开关频率高达 1MHz
可编程自适应突发控制和待机模式,可提高轻载效率,并具有低输出纹波和可闻噪声抑制功能
无需直接的线路感应即可检测掉电
通过精确的可编程过功率保护 (OPP) 支持峰值功率模式
故障保护:过热、输出过压、输出短路、过流和引脚故障
与基于光耦合器的反馈直接相连,因此支持可动态扩展的输出电压
内部软启动
带外部使能端的 NTC 热敏电阻接口