ZHCS538M September 2008 – October 2020 LM22678 , LM22678-Q1
PRODUCTION DATA
- 1 特性
- 2 應(yīng)用
- 3 說明
- 4 Revision History
- 5 Pin Configuration and Functions
- 6 Specifications
- 7 Detailed Description
- 8 Application and Implementation
- 9 Layout
- 10Device and Documentation Support
封裝選項
機(jī)械數(shù)據(jù) (封裝 | 引腳)
- NDR|7
散熱焊盤機(jī)械數(shù)據(jù) (封裝 | 引腳)
訂購信息
8.2.1.2.3 Output Capacitor
The output capacitor is responsible for filtering the output voltage and supplying load current during transients. Capacitor selection depends on application conditions as well as ripple and transient requirements. Best performance is achieved with a parallel combination of ceramic capacitors and a low-ESR SP? or POSCAP? type. Very low ESR capacitors such as ceramics reduce the output ripple and noise spikes, while higher value electrolytics or polymer provide large bulk capacitance to supply transients. Assuming very low ESR, Equation 16 determines an approximation to the output voltage ripple.
Typically, a total value of 100 μF or greater is recommended for output capacitance.
In applications with Vout less than 3.3 V, it is critical that low-ESR output capacitors are selected. This will limit potential output voltage overshoots as the input voltage falls below the device normal operating range.