參數(shù)資料
型號(hào)： NCP4331
廠商： ON SEMICONDUCTOR
英文描述： Synchronous Buck Controller for High Efficiency Post Regulation
中文描述： 同步降壓控制器的高效率后調(diào)整
文件頁數(shù)： 19/23頁
文件大?。?/td> 195K
代理商： NCP4331
NCP4331
http://onsemi.com
19
L
LOAD2
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
+
Regulation
Block
LOAD1
HS_ DRV
VCC
VDD
LS_ DRV
GND
SYNC
BST
HB
SS
FB
Cramp
COMP
UVP
FB
VIN_FORWARD
Forward
Driver
(e.g.
NCP1280)
V
in
R
u
R
u
R
sync
V
out2
R
S
(Coil Series
Resistor)
V
out1
+
Figure 27. Post-Regulation with CCCV Protection
CSin+
CSin-
CSout
C1
R1
R2
V
out1
R
th0
CSin+
FB
CSin+
CSin-
VCC
CSin-
In Figure 27, the series resistor R
S
of the inductor senses the coil current. Practically if the resistors R
1
and R
2
are equal and
if R
th0
is high compared to them, the inductor voltage is integrated by the auxiliary OPAMP. Since the average voltage across
the pure inductive part of the coil is zero in steady state, this sensing technique actually returns the averaged voltage across
the series resistor R
S
(”V
RS
”). V
RS
is compared to an offset created using the main output voltage (“V
out1
”) together with of
the R2 and Rth0 resistors (more specifically, this offset is [(R2/(R2 + R
th0
))
V
out1
]). Finally, the coil maximum current is given
by: (I
coil
)max = (R2/(R2 + R
th0
))
V
out1
/R
S
). Any accurate voltage source could be used instead of V
out1
. This technique that
limits the coil current as a function of the main output V
out1
, further performs some soft-start function and helps V
out2
track
V
out1
.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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