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參數(shù)資料
| 型號： | PM6680TR |
| 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, 1 MM HEIGHT, 0.50 MM PITCH, LEAD FREE, VFQFPN-32 |
| 文件頁數(shù)： | 33/49頁 |
| 文件大?。?/td> | 2931K |
| 代理商： | PM6680TR |
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PM6680
Device description
39/49
The T node voltage is the sum of the output voltage and the triangular waveform generated
by the virtual ESR network. In fact the virtual ESR network behaves like a further equivalent
ESR RESR.
A good trade-off is to design the network in order to achieve an RESR given by:
Equation 28
where
I
L is the inductor current ripple and VRIPPLE is the overall ripple of the T node
voltage. It should be chosen higher than approximately 30 mV.
The new closed loop gain depends on CINT. In order to ensure stability it must be verified
that:
Equation 29
Where:
Equation 30
where RTOT is the sum of the ESR of the output capacitor Rout and the equivalent ESR
given by the virtual ESR network RESR.
Moreover CINT must meet the following condition:
Equation 31
Where k is a free design parameter greater than 3 and determines the minimum integrator
capacitor value CINT:
Equation 32
C must be selected as shown:
Equation 33
out
L
RIPPLE
ESR
R
I
V
R
=
OUT
Z
m
INT
V
Vr
f
2
g
C
×
π
>
TOT
out
Z
R
C
2
1
f
×
π
=
TOT
out
Z
sw
R
C
2
k
f
k
f
×
π
=
×
>
OUT
Z
sw
m
INT
V
Vr
f
k
f
2
g
C
×
×
π
>
INT
C
5
C
×
>
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