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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 18/41頁 |
| 文件大?。?/td> | 310K |
| 代理商： | R2A20111SPW0 |
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R2A20111SP/DD
REJ03F0231-0100 Rev.1.00 Mar 28, 2007
Page 18 of 40
4-2. Multiplier Gain Switching
Multiplier gain is switched according to the input AC voltage.
4-3. Operation on a Momentary Outage
(PFC operation hold on momentary outage: PFC hold function)
(1) When the Momentary Outage is Short
During a momentary outage, the voltage on the PFC-ON pin is discharged. When it reaches 0.79 V, charging of the
capacitor on the DELAY pin starts. When AC-voltage input is resumed, and the voltage on the DELAY pin doesn’t
reach 1.2 V before the voltage on the PFC-ON pin rises above 0.82 V, The PFC output voltage resumes quickly
since the soft-start function is not operated.
When the voltage on the PFC-ON pin falls below 0.6 V during a momentary outage, the source current of the PFC-
ON pin starts to increase. As the voltage on the PFC-ON pin becomes low, the amount of current increases. Since
the external resistor is connected to GND, the voltage on the PFC-ON pin is balanced between the source current
and the voltage determined by the resistance. This function prevents increase of AC current right after AC-voltage
input is resumed.
Full-wave rectified AC
PFC-ON
DELAY
OUT
PFC output voltage
Ipfc-on
0.79V
0.82V
1.2V
Figure 6 PFC Hold Function Operation Waveform 1
The hold time for PFC operation is adjusted by the value of the capacitance on the DELAY pin. Note, however, that
if VCC voltage of the IC is not normally supplied during a momentary outage, the PFC-ON hold function does not
operate.
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