參數(shù)資料
型號(hào)： 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)： 32/49頁
文件大?。?/td> 2931K
代理商： PM6680TR
Device description
PM6680
38/49
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 36). 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.
Figure 37.
Virtual ESR network
filt
INT
filt
INT
CUT
INT
C
f
2
1
R
+
×
π
=
q
V
C
V
RIPPLEout
filt
INT
RIPPLEout
RIPPLEINT
×
=
+
×
=
COMP
OUT
C
CINT
INT
R
RINT
INT
C
CFILT
FILT
t
Vr
C
COUT
OUT
COMP PIN
VOLTAGE
L
D
OUTPUT
VOLTAGE
C
R
R1
t
T
T NODE
VOLTAGE
?V
?V1
R
ROUT
OUT
?V1
+
-
Vr
- gm
gm
Vr
+
PWM
Comparator
V1
FB
R
R11
R
R22
COMP
OUT
C
CINT
INT
R
RINT
INT
C
CFILT
FILT
t
Vr
C
COUT
OUT
COMP PIN
VOLTAGE
L
D
OUTPUT
VOLTAGE
C
R
R1
t
T
T NODE
VOLTAGE
?V
?V1
R
ROUT
OUT
?V1
+
-
Vr
-- gm
gm
Vr
+
PWM
Comparator
V1
FB
R
R11
R
R22
R
R11
R
R22
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