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參數資料
| 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： | 功率因數校正控制芯片 |
| 文件頁數： | 15/41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 15 of 40
2. Operating Frequency
The R2A20111 operating frequency fosc is determined by adjusting the timing resistor Rt (the RT pin, pin 9) and the
timing capacitance Ct (the CT pin, pin 10). The operating frequency is approximated by the following expression:
fosc =
1.755
×
10
6
Rt
(k
Ω
)
×
Ct
(pF)
(kHz)
Make sure to use a 7 k
Ω
or more resistance because of the maximum rating of the RT-pin. Meanwhile, as the resistance
increases, the IC will become more susceptible to noise, etc. The resistance, therefore, should be up to about 100 k
Ω
.
Also, use a 100 pF or more for the timing capacitance to reduce effects from parasitic capacitance and noise.
When the IC is operated at high frequencies, the expression becomes less accurate due to the IC internal delay time, etc.
Please confirm operation the value with the actually mounted IC. The maximum operating frequency is 400 kHz. As a
reference, the operating frequency data when the timing resistor and the timing capacitance are changed is shown in the
figure below.
1
10
100
1000
1
10
100
Timing Resistance (k
Ω
)
Timing capacitance
Ct
470pF
1000pF
2200pF
4700pF
O
Figure 2 Operating Frequency Characteristics
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