參數(shù)資料
型號(hào)： PM6675TR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, QCC24
封裝： 4 X 4 MM, VFQFPN-24
文件頁(yè)數(shù)： 13/50頁(yè)
文件大?。?/td> 782K
代理商： PM6675TR
Device description
PM6675
20/47
Figure 8.
"Virtual-ESR" network
The ripple on the COMP pin is the sum of the output voltage ripple and the triangular ripple
generated by the Virtual-ESR Network. In fact the Virtual-ESR Network behaves like a
another equivalent series resistor RVESR.
A good trade-off is to design the network in order to achieve an RVESR given by:
Equation 10
where
I
L is the inductor current ripple and VRIPPLE is the total ripple at the T node, chosen
greater than approximately 20mV.
The new closed-loop gain depends on CINT. In order to ensure stability it must be verified
that:
Equation 11
where:
Equation 12
and:
COMP
VSNS
C
CINT
INT
R
RINT
INT
C
CFILT
FILT
t
VREF
C
COUT
OUT
COMP PIN
VOLTAGE
OUTPUT
VOLTAGE
C
R
R11
t
T
T NODE
VOLTAGE
V
V2
ESR
V1
+
-
V
VREF
REF
- ggm
m
R
RFb1
Fb1
R
RFb2
Fb2
Vr
+
PWM
Comparator
I=gm(V1-Vr)
V
V11
ESR
I
V
R
L
RIPPLE
VESR
=
Vout
Vr
f
2
g
C
Z
m
INT
π
>
TOT
out
Z
R
C
2
1
f
π
=
相關(guān)PDF資料
PDF描述
PM6675 SWITCHING CONTROLLER, QCC24
PM6680ATR 0.4 A DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC32
PM6680A 0.4 A DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC32
PM6680TR 0.4 A DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC32
PM6685TR DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC32
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