ZHCS819G March 2012 – March 2018 DRV110
PRODUCTION DATA.
- 1 特性
- 2 應(yīng)用
- 3 說(shuō)明
- 4 修訂歷史記錄
- 5 Pin Configuration and Functions
- 6 Specifications
- 7 Detailed Description
- 8 Application and Implementation
- 9 Power Supply Recommendations
- 10Layout
- 11器件和文檔支持
- 12機(jī)械、封裝和可訂購(gòu)信息
封裝選項(xiàng)
機(jī)械數(shù)據(jù) (封裝 | 引腳)
散熱焊盤機(jī)械數(shù)據(jù) (封裝 | 引腳)
訂購(gòu)信息
7.3.1 Keep Time
The keep time, tKEEP, is set externally by connecting a capacitor to the KEEP pin. A constant current is sourced from the KEEP pin that is driven into an external capacitor resulting in a linear voltage ramp. When the KEEP pin voltage reaches 100 mV, the current regulation reference voltage, VREF, is switched from VPEAK to VHOLD. The internal current source is switched off, and the capacitor is grounded for discharge. The dependency of tKEEP from the external capacitor size can be calculated with Equation 1.
Equation 1. 