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參數(shù)資料
| 型號： | PM6670ASTR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3 A SWITCHING CONTROLLER, QCC24 |
| 封裝： | 4 X 4 MM, LEAD FREE, VFQFPN-24 |
| 文件頁數(shù)： | 18/53頁 |
| 文件大?。?/td> | 745K |
| 代理商： | PM6670ASTR |
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PM6670AS
Device description
Doc ID 14436 Rev 2
25/53
Equation 7
where gm = 50
μs is the integrator trans conductance.
In order to ensure stability it must be also verified that:
Equation 8
If the ripple on the COMP pin is greater than the integrator 150 mV, the auxiliary capacitor
CFILT can be added. If q is the desired attenuation factor of the output ripple, CFILT is given
by:
Equation 9
In order to reduce the noise on the COMP pin, it is possible to add a resistor RINT that,
together with CINT and CFILT, becomes a low pass filter. The cutoff frequency fCUT must be
much greater (10 or more times) than the switching frequency:
Equation 10
If the ripple is very small (lower than approximately 20 mV), a different compensation
network, called “Virtual-ESR” Network, is needed. This additional circuit generates a
triangular ripple that is added to the output voltage ripple at the input of the integrator. The
complete control scheme is shown in Figure 30.
Vout
Vr
f
k
f
2
g
C
Zout
SW
m
INT
π
>
OUT
Zout
m
INT
V
Vr
f
2
g
C
π
>
q
)
q
1
(
C
INT
FILT
=
FILT
INT
FILT
INT
CUT
INT
C
f
2
1
R
+
π
=
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