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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)： | 16/41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 16 of 40
3. Soft Start
This function gradually increases the pulse width of the OUT pin from a 0% duty cycle at the startup. By preventing a
sudden increase of the pulse width, potential problems such as transient stress on the external parts, overshoot of the
PFC output voltage (B+ voltage), or coil noise generated due to overcurrent will be prevented. Although the duty cycle
is controlled by the CAO signal, operation of the CAO pin is affected by the voltage on the SS pin during the soft start.
When the voltage on the CAO pin reaches the required voltage level, the soft start ends and operation transfers to the
normal control.
The soft-start time can be set by an external capacity.
CT
OUT
SS
CAO
PFC-ON
0.82V
SS
CAO
PFC output voltage
GATE DRIVER
+/
1.0A(PEAK)
CAO
OUT
PFC-ON
25
μ
A
SS
CT
10
7
11
1
15
C
AMP
VREF
0.82V
0.79V
VREF
5
4
CAI
CGND
VREF
14k
1
μ
720k
Full-wave
rectified AC
0.47
μ
VREF
To
Power MOS FET
gate
+
+
+
Figure 3 Soft-Start Operation Waveform
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