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參數資料
| 型號： | PM6680ATR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.4 A DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC32 |
| 封裝： | 5 X 5 MM, LEAD FREE, VFQFPN-32 |
| 文件頁數： | 30/48頁 |
| 文件大?。?/td> | 1932K |
| 代理商： | PM6680ATR |
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Design guidelines
PM6680A
36/48
In order to ensure stability it must be also verified that:
Equation 25
In order to reduce ground noise due to load transient on the other section, it is
recommended to add a resistor RINT and a capacitor Cfilt that, together with CINT, realize a
low pass filter (see figure 13). The cutoff frequency fCUT must be much greater (10 or more
times) than the switching frequency of the section:
Equation 26
Due to the capacitive divider (CINT, Cfilt), the ripple voltage at the COMP pin is given by:
Equation 27
Where VRIPPLEout is the output ripple and q is the attenuation factor of the output ripple.
If the ripple is very small (lower than approximately 30 mV), a further compensation network,
named virtual ESR network, is needed. This additional part generates a triangular ripple
that is added to the ESR output voltage ripple at the input of the integrator network. The
complete control schematic is represented in Figure 37.
OUT
Zout
m
INT
V
Vr
f
2
g
C
×
π
>
filt
INT
filt
INT
CUT
INT
C
f
2
1
R
+
×
π
=
q
V
C
V
RIPPLEout
filt
INT
RIPPLEout
RIPPLEINT
×
=
+
×
=
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| PM6685 | 功能描述:DC/DC 開關控制器 Dual Step Down Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
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