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參數(shù)資料
| 型號： | R2A20111SPW0 |
| 廠商： | Renesas Technology Corp. |
| 元件分類： | 基準電壓源/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)： | 35/41頁 |
| 文件大小： | 310K |
| 代理商： | R2A20111SPW0 |
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R2A20111SP/DD
REJ03F0231-0100 Rev.1.00 Mar 28, 2007
Page 35 of 40
3. Overcurrent Detection Circuit
When the RC filter is added the CLIMIT pin to prevent noise errors (see figure 21), the cut-off frequency shifts on the
lower frequency side than the added RC filter because of the Rclimit 1 and Rclimit 2. This causes possibility that
exactly current can not detect.
Rclimit2
C
CLIMIT
Rclimit1
R
VREF
Rcs
Figure 21 Example of CLIMIT Pin Filter
Since the overcurrent is detected by coil current, the detected current value is not the same as the peak value of the AC
input current (see figure 22). Because of this difference, the overcurrent detection circuit is operated before the power
reaches the constant power limit, and noise of an inductor may occur. In such a case, raise the overcurrent detection
level.
AC input
current peak
Overcurrent
detection level
Coil current
Δ
I
Difference in current is approximated
by the following equation:
√
2
×
Vac
×
D
×
fosc
2
×
L
Vac: input AC voltage
L: Step-up coil inductance
D: IC OUT pin ON Duty
fosc: IC operating frequency
Δ
I =
Figure 22 AC Input Current and Coil Current
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