ZHCS517E April 2000 – June 2019 LM2587
PRODUCTION DATA.
- 1 特性
- 2 典型 應用
- 3 說明
- 4 修訂歷史記錄
- 5 Pin Configurations
-
6 Specifications
- 6.1 Absolute Maximum Ratings
- 6.2 ESDRatings
- 6.3 Recommended Operating Ratings
- 6.4 Thermal Information
- 6.5 Electrical Characteristics: 3.3 V
- 6.6 Electrical Characteristics: 5 V
- 6.7 Electrical Characteristics: 12 V
- 6.8 Electrical Characteristics: Adjustable
- 6.9 Electrical Characteristics: All Output Voltage Versions
- 6.10 Typical Characteristics
- 7 Detailed Description
- 8 Application And Implementation
- 9 Layout
- 10器件和文檔支持
- 11機械、封裝和可訂購信息
封裝選項
機械數據 (封裝 | 引腳)
散熱焊盤機械數據 (封裝 | 引腳)
- KTT|5
訂購信息
8.2.4.4 Flyback Regulator Input Capacitors
A flyback regulator draws discontinuous pulses of current from the input supply. Therefore, there are two input capacitors needed in a flyback regulator; one for energy storage and one for filtering (see Figure 59). Both are required due to the inherent operation of a flyback regulator. To keep a stable or constant voltage supply to the LM2587, a storage capacitor (≥100 μF) is required. If the input source is a recitified DC supply and/or the application has a wide temperature range, the required rms current rating of the capacitor might be very large. This means a larger value of capacitance or a higher voltage rating will be needed of the input capacitor. The storage capacitor will also attenuate noise which may interfere with other circuits connected to the same input supply voltage.
Figure 59. Flyback Regulator In addition, a small bypass capacitor is required due to the noise generated by the input current pulses. To eliminate the noise, insert a 1.0 μF ceramic capacitor between VIN and ground as close as possible to the device.