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參數(shù)資料
| 型號： | XC9101D09AKR |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 12/21頁 |
| 文件大小： | 156K |
| 代理商： | XC9101D09AKR |
5. FB Voltage and Cfb
With regard to the XC9101D series, the output voltage is set by attaching externally dividing resistors. The
output voltage is determined by the equation shown below according to the values of Rfb1 and Rfb2. In
general, the sum of Rfb1 and Rfb2 should be 1 MEG
or less.
Example:
12
Cfb = 1/(2 x
π
x Rfb1 x fzfb)
When Rfb1 = 455 k
and Rfb2 = 100 k
, V
OUT
= 0.9 x (455 k + 100 k)/100 k = 4.995 V and Cfb =
1/(2 x
π
x 455 k x 10 k) = 34.98 pF.
V
OUT
= 0.9 x (Rfb1 + Rfb2)/Rfb2
The value of Cfb (phase compensation capacitor) is approximated by the following equation according to the
values of Rfb1 and fzfb. The value of fzfb should be 10 kHz, as a general rule.
XC9101/02 Series
PWM Controlled, PWM//PFM Switchable Step-Up DC/DC Converters
FB pin
[Inside IC, XC9101/02]
Rfb1
+
-
Rfb2
Verr amplifier
0.9 V
Cfb
Output voltage
Verr
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