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參數(shù)資料
| 型號(hào)： | R2A20111SPW0 |
| 廠商： | Renesas Technology Corp. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Power Factor Correction Controller IC |
| 中文描述： | 功率因數(shù)校正控制芯片 |
| 文件頁(yè)數(shù)： | 21/41頁(yè) |
| 文件大?。?/td> | 310K |
| 代理商： | R2A20111SPW0 |
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R2A20111SP/DD
REJ03F0231-0100 Rev.1.00 Mar 28, 2007
Page 21 of 40
5-1. Power-Supply Startup Operation
When the AC voltage is applied, the PFC-ON pin voltage starts to rise up. After it has reached 0.82 V, the voltage on
the SS pin starts to be discharged and PFC operation is started with the soft-start function. Once the PFC operation is
started, the voltage on the FB pin rises and is controlled so that it reaches 2.5 V.
Full-wave rectified AC
PFC-ON
SS
CAO
SS
CAO
FB
0.82V
2.5V
PFC output voltage
Figure 9 Waveform in Startup Operation
5-2. Operation when the Power-Supply Stops
When the supply of AC voltage stops, both of the PFC output voltage and the voltage on the FB pin fall. When the
voltage on the FB pin is lower than 0.52 V, the PFC operation stops and the SS pin is reset.
Full-wave rectified AC
FB
SS
0.52V
OUT
Figure 10 Waveform in Stop Operation
Note: When the PFC output voltage is driving light load, the PFC output voltage falls slowly, and the PFC-hold
function may be activated before the voltage on the FB pin falls to 0.52 V. In this case, the PFC hold function
operates, stopping output on the OUT pin and resetting the SS pin.
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