ZHCSK45C august 2019 – december 2020 UCC28740-Q1
PRODUCTION DATA
- 1
- 1 特性
- 2 應(yīng)用
- 3 說明
- 4 Revision History
- 5 Revision History
- 6 Revision History
- 7 Pin Configuration and Functions
- 8 Specifications
- 9 Detailed Description
-
10Application and Implementation
- 10.1 Application Information
- 10.2 High Voltage Applications
- 10.3
Typical Application
- 10.3.1 Design Requirements
- 10.3.2
Detailed Design Procedure
- 10.3.2.1 Custom Design With WEBENCH? Tools
- 10.3.2.2 Standby Power Estimate and No-Load Switching Frequency
- 10.3.2.3 Input Bulk Capacitance and Minimum Bulk Voltage
- 10.3.2.4 38
- 10.3.2.5 Transformer Turns-Ratio, Inductance, Primary Peak Current
- 10.3.2.6 Transformer Parameter Verification
- 10.3.2.7 VS Resistor Divider, Line Compensation
- 10.3.2.8 Output Capacitance
- 10.3.2.9 VDD Capacitance, CVDD
- 10.3.2.10 Feedback Network Biasing
- 10.3.3 Application Curves
- 11Power Supply Recommendations
- 12Layout
-
13Device and Documentation Support
- 13.1
Device Support
- 13.1.1 Development Support
- 13.1.2
Device Nomenclature
- 13.1.2.1 Capacitance Terms in Farads
- 13.1.2.2 Duty Cycle Terms
- 13.1.2.3 Frequency Terms in Hertz
- 13.1.2.4 Current Terms in Amperes
- 13.1.2.5 Current and Voltage Scaling Terms
- 13.1.2.6 Transformer Terms
- 13.1.2.7 Power Terms in Watts
- 13.1.2.8 Resistance Terms in Ohms
- 13.1.2.9 Timing Terms in Seconds
- 13.1.2.10 Voltage Terms in Volts
- 13.1.2.11 AC Voltage Terms in VRMS
- 13.1.2.12 Efficiency Terms
- 13.2 Documentation Support
- 13.3 Receiving Notification of Documentation Updates
- 13.4 Community Resources
- 13.5 Trademarks
- 13.1
Device Support
- Mechanical, Packaging, and Orderable Information
3 說明
UCC28740-Q1 隔離式反激電源控制器可使用光耦合器調(diào)節(jié)輸出，以提供對大型負載階躍的快速瞬態(tài)響應(yīng)。
內(nèi)部采用 700V 啟動開關(guān)，可動態(tài)控制工作狀態(tài)并定制調(diào)制配置文件，支持超低待機功耗，并且不會影響啟動時間或輸出瞬態(tài)響應(yīng)。
UCC28740-Q1 中的控制算法可使操作效率達到或超過適用標準。驅(qū)動輸出接至一個 MOSFET 電源開關(guān)。帶有谷值開關(guān)的斷續(xù)傳導(dǎo)模式 (DCM) 減少了開關(guān)損耗。開關(guān)頻率的調(diào)制和初級電流峰值振幅（FM 和 AM）在整個負載和線路范圍內(nèi)保持較高的轉(zhuǎn)換效率。
此控制器有一個 100kHz 的最大開關(guān)頻率并且一直保持對變壓器內(nèi)峰值初級電流的控制。保護特性可抑制初級和次級應(yīng)力分量。170kHz 的最小開關(guān)頻率可輕松實現(xiàn)少于 10mW 無負載功耗。
器件信息(1)
| 器件型號 | 封裝 | 封裝尺寸（標稱值） |
|---|---|---|
| UCC28740-Q1 | SOIC (7) | 4.90mm × 3.91mm |
(1) 如需了解所有可用封裝，請參閱數(shù)據(jù)表末尾的可訂購產(chǎn)品附錄。
簡化版應(yīng)用示意圖
典型伏安圖