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PM6685 bảng dữ liệu(PDF) 38 Page - STMicroelectronics

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PM6685 bảng dữ liệu(HTML) 38 Page - STMicroelectronics

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Monitoring and protections
PM6685
38/52
A rectifier across the low side MOSFET is recommended. The rectifier works as a voltage
clamp across the synchronous rectifier and reduces the negative inductor swing during the
dead time between turning the high-side MOSFET off and the synchronous rectifier on. It
can increase the efficiency of the switching section, since it reduces the low side switch
losses. A schottky diode is suitable for its low forward voltage drop (0.3V). The diode reverse
voltage must be greater than the maximum input voltage VINmax. A minimum recovery
reverse charge is preferable. Below there is a list of some schottky diode manufacturers.
8.11
Closing the integrator loop
The design of external feedback network depends on the output voltage ripple. If the ripple
is higher than approximately 30mV, the feedback network (Figure 36) is usually enough to
keep the loop stable.
Figure 36. Circuitry for output ripple compensation
Table 16.
Dual MOSFET manufacturer
Manufacturer
Type
RDSon (mΩ)
Gate charge (nC)
Rated reverse
voltage (V)
ST
STS8DNH3LL
25
10
30
ST
STS4DNF60L
65
32
60
Table 17.
Schottky diode manufacturer
Manufacturer
Series
Forward voltage
(V)
Rated reverse
voltage (V)
Reverse current
(uA)
ST
STPS1L30M
0.34
30
0.00039
ST
STPS1L20M
0.37
20
0.000075
+
-
Vr
Vr
COMP
COMP
gm
gm
OUT
OUT
RFb1
RFb1
RFb2
RFb2
Vr
Vr
+
PWM
PWM
Comparator
Comparator
CINT
CINT
RINT
RINT
CFILT
CFILT
t
Vr
COUT
COUT
COMP PIN
VOLTAGE
L
L
D
D
OUTPUT VOLTAGE
I=gm(V1-Vr)
V1
V1
t
∆V
∆V
VCINT
VCINT
ROUT
ROUT
+
-
Vr
Vr
COMP
COMP
gm
gm
OUT
OUT
RFb1
RFb1
RFb2
RFb2
Vr
Vr
+
PWM
PWM
Comparator
Comparator
CINT
CINT
RINT
RINT
CFILT
CFILT
t
Vr
COUT
COUT
COMP PIN
VOLTAGE
L
L
D
D
OUTPUT VOLTAGE
I=gm(V1-Vr)
V1
V1
t
∆V
∆V
VCINT
VCINT
ROUT
ROUT



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