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)： 30/41頁(yè)
文件大?。?/td> 310K
代理商： R2A20111SPW0
R2A20111SP/DD
REJ03F0231-0100 Rev.1.00 Mar 28, 2007
Page 30 of 40
1. Power Limit Function
1-1. Limited Power Value
When the load exceeds the rated load, the power is limited by the set power value and the IC enters the constant power
control state. This indicates that the power is limited by nearly-constant power independent of the input AC voltage,
compared to the conventional overcurrent detection circuit. The limited power value is determined by the values of
external resistors and is expressed by the following equation:
R
cs
R
ac
R
pfc22
R
mo
(R
pfc1
+ R
pfc2
)
2
P
limit
= 1.74
This is the equation for reference only. Be sure to sufficiently confirm the operation by using the actual circuit board.
The actual value may differ from the equation by conditions, but the trend indicated by the equation remains the same
(For instance, as the amount of Rmo becomes large, the limited power value increases). Therefore, use the equation
above for reference to fine-tune the resistance values.
1-2. Trend of Limited Power Value for Input AC Voltage
Although the limited power value is nearly constant with respect to the input AC voltage, it may be deviated to a certain
degree from linearity by conditions. When it has a negative slant with respect to the input AC voltage, add a resistor
between the CAI pin and the VREF pin so that the deviation from linearity can be corrected to some degree.
1-3. Limit on Constant Power Function
After the PFC power supply enters the constant power operation state and load increases further, the PFC output voltage
reaches about
√
2
×
input AC voltage. At this point the PFC output voltage is unable to fall below the point in principle
of the boost converter. If the load increases further at this point, current increases on the peak part of input current, then
the power starts increasing again. This current cannot be controlled by the IC.
PFC Output Current
PFC Output Current
P
P
√
2
Vac
Constant
power
curve
Rise in power for
the reason that
the AC voltage
is high and the
output voltage is
unable to fall
below
√
2
Vac.
Figure 14 Outline of Constant Power Limit Function
1-4. Effects on Power Limit Characteristics of Resistor Rcao1 of CAO Pin
As the external resistance Rcao1 of the CAO pin is small, the limited power value decreases.
This decrease is caused by rise of the voltage on the EO pin in principle as Rcao1 becomes small. When the load
becomes heavy and the voltage on the EO pin is clamped at the upper limit, the IC is operated in the power limit
operation mode. Therefore, since the voltage on EO pin increases, the power limit value decreases relatively.
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