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參數(shù)資料
| 型號： | TDA4817G |
| 廠商： | SIEMENS A G |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Power Factor Controller IC for High Power Factor and Active Harmonic Filtering |
| 中文描述： | 0.5 A POWER FACTOR CONTROLLER, PDSO8 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大小： | 369K |
| 代理商： | TDA4817G |
Semiconductor Group
9
Discontinuous Operation Mode with Variable Frequency
The TDA 4817 works in a discontinuous operation mode with variable frequency.
The principle of a freely oscillating controller exploits the physical relationship between current and
voltage at the boost converter choke. The current in the semiconductors flows in a triangular shape.
This is only when the current in the boost converter diode has gone to zero that the transistor goes
conductive. This arrangement does away with the diode’s power-squandering reverse currents.
If triangular currents flow continuously through the boost converter choke the input current
averaged over a high-frequency period is exactly half the peak of the high-frequency choke current.
If the peak values of the choke current are located along an envelope curve that is proportional to
a sinusoidal low- frequency input voltage, the input current available after smoothing in an RFI filter
is sinusoidal.
TDA 4817
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