ZHCSHY7A April 2018 – May 2018 UCC28742
PRODUCTION DATA.
- 1 特性
- 2 應(yīng)用
- 3 說明
- 4 修訂歷史記錄
- 5 Pin Configuration and Functions
- 6 Specifications
-
7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3 Feature Description
- 7.4 Device Functional Modes
-
8 Applications 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 VDD Capacitance, CDD
- 8.2.2.3 VDD Start-Up Resistance, RSTR
- 8.2.2.4 Input Bulk Capacitance and Minimum Bulk Voltage
- 8.2.2.5 Transformer Turns Ratio, Inductance, Primary-Peak Current
- 8.2.2.6 Transformer Parameter Verification
- 8.2.2.7 VS Resistor Divider and Line Compensation
- 8.2.2.8 Standby Power Estimate
- 8.2.2.9 Output Capacitance
- 8.2.2.10 Feedback Loop Design Consideration
- 8.2.3 Application Curves
- 8.3 Do's and Don'ts
- 9 Power Supply Recommendations
- 10Layout
-
11器件和文檔支持
- 11.1
器件支持
- 11.1.1 開發(fā)支持
- 11.1.2
器件命名規(guī)則
- 11.1.2.1 電容術(shù)語（以法拉為單位）
- 11.1.2.2 占空比術(shù)語
- 11.1.2.3 頻率術(shù)語（以赫茲為單位）
- 11.1.2.4 電流術(shù)語（以安培為單位）
- 11.1.2.5 電流和電壓調(diào)節(jié)術(shù)語
- 11.1.2.6 變壓器術(shù)語
- 11.1.2.7 功率術(shù)語（以瓦特為單位）
- 11.1.2.8 電阻術(shù)語（以 Ω 為單位）
- 11.1.2.9 時(shí)序術(shù)語（以秒為單位）
- 11.1.2.10 電壓術(shù)語（以伏特為單位）
- 11.1.2.11 交流電壓術(shù)語（以 VRMS 為單位）
- 11.1.2.12 效率術(shù)語
- 11.2 文檔支持
- 11.3 接收文檔更新通知
- 11.4 社區(qū)資源
- 11.5 商標(biāo)
- 11.6 靜電放電警告
- 11.7 術(shù)語表
- 11.1
器件支持
- 12機(jī)械、封裝和可訂購信息
封裝選項(xiàng)
機(jī)械數(shù)據(jù) (封裝 | 引腳)
- DBV|6
散熱焊盤機(jī)械數(shù)據(jù) (封裝 | 引腳)
訂購信息
8.2.2.9 Output Capacitance
The output capacitance value is typically determined by the transient response requirement. Equation 27 assumes that the switching frequency can be at the UCC28742 minimum of fSW(min).
Another consideration of the output capacitor(s) is the ripple voltage requirement. The output capacitors and their total ESR are the main factors to determine the output voltage ripple. Equation 28 provides a formula to determine required ESR value RESR, and Equation 28 provides a formula to determine required capacitance. The total output ripple is the sum of these two parts with scale factors and 10mV to consider other noise as shown in Equation 30,
Example: if require VRIPPLE = 70 mV, assume 0.81 × VRIPPLE_R = 1.15 × VRIPPLE_C = 30 mV, then RESR = 4.05 mΩ, and COUT = 643 µF, with assumption of LP = 700 µH, IPP(max) = 0.713 A, NPS = 13, VOCV = 5.3 V.