參數(shù)資料
型號： NCP4331DR2G
廠商： ON SEMICONDUCTOR
元件分類： 穩(wěn)壓器
英文描述： Synchronous Buck Controller for High Efficiency Post Regulation
中文描述： SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDSO16
封裝： LEAD FREE, SOIC-16
文件頁數(shù)： 12/23頁
文件大?。?/td> 195K
代理商： NCP4331DR2G
NCP4331
http://onsemi.com
12
Figure 20. NCP4331 Post-Regulator Associated to a Forward Converter
X1
X2
Forward
Controller
D1
D2
L1
C1
D3
Forward
Input
Source
L2
C2
X12
X13
NCP4331
GND
NCP4331
Driven
Post-Regulator
Feed-back
with
isolation
Feed-back
LOAD2
LOAD1
Demag.
Winding
+
+
V
in
V
out2
V
out1
I
n the case of a forward operating in continuous
conduction mode (CCM) operation, the cycle is simply
given by the following equation (the converter losses being
neglected):
d
F
V
out1
N
S
N
P
V
inforward
(eq. 1)
Where:
d
F
is the forward duty cycle,
N
S
/N
P
is the transformer turn ratio (N
P
: primary number of
turns, N
S
: secondary number of turns),
(V
in
)
forward
is the forward converter input voltage,
V
out1
is the main output voltage of the forward converter.
Figure 21. Leading Edge Modulation
The duty-cycle of the
high-side MOSFET is
modulated by adjusting the
leading edge of its drive
(Leading Edge Modulation)
High-Side
MOSFET Drive
V
in
(Post-
Regulator
Input Voltage
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