參數(shù)資料
型號(hào)： R2A20111SPW0
廠商： Renesas Technology Corp.
元件分類(lèi)： 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)： 33/41頁(yè)
文件大小： 310K
代理商： R2A20111SPW0
R2A20111SP/DD
REJ03F0231-0100 Rev.1.00 Mar 28, 2007
Page 33 of 40
2. Operation of PFC On/Off Function
PFC function of the R2A20111 can be turned on and off externally using the following methods.
(1) Pull down the voltage on the PFC-ON pin to the GND level.
(2) Pull up the voltage on the SS pin to the VREF voltage level.
(3) Pull down the voltage on the CLIMIT pin to 1.3 V or lower.
(4) Pull up the voltage on the DELAY pin to 4 V or more.
Since the voltage on the OUT pin is fixed to the GND level in each case, the boost operation is halted. The sections
from 2-1 to 2-4 describe phenomena which may occur for functional reasons of the IC. Make sure to sufficiently
confirm each operation using the actual the power-supply board. When the current flows transiently and noise of an
inductor is generated, refer to section 1-5 “Relations between RT Resistor and Power Limit”.
2-1. On/Off Operation by Using the PFC-ON Pin
When the voltage on the PFC-ON pin drops, the IC controls to increase the AC current. Therefore, the AC current is
controlled to increase while the voltage on the PFC-ON pin is pulled down. Furthermore, the PFC-ON pin has the PFC
hold function. Since the PFC operation is not halted during the hold periods, the control current increases during this
period (see figure 18). Also, when the PFC function is turned off in the light load, the output voltage may rise due to
this increase current.
PFC hold time
0.79V
0.82V
0V
PFC-ON pin
DELAY pin
1.2V
AC current
Soft start
Full-wave rectified AC
Figure 18 On/Off Operation by PFC-ON pin
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R2A20112DD 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:Critical Conduction Mode Interleaved PFC Control IC
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