ncp1910 ON Semiconductor, ncp1910 Datasheet - Page 20
![no-image](/images/manufacturer_photos/0/4/495/on_semiconductor_sml.jpg)
ncp1910
Manufacturer Part Number
ncp1910
Description
Ncp1910 High Performance Combo Controller For Atx Power Supplies
Manufacturer
ON Semiconductor
Datasheet
1.NCP1910.pdf
(37 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ncp1910A65DWR2G
Manufacturer:
ON Semiconductor
Quantity:
1 000
Part Number:
ncp1910B10
Manufacturer:
ON/安森美
Quantity:
20 000
Company:
Part Number:
ncp1910B65DWR2G
Manufacturer:
ON Semiconductor
Quantity:
35
Part Number:
ncp1910B65DWR2G
Manufacturer:
ON/安森美
Quantity:
20 000
PFC Methodology
particularly designed for CCM operation. The PFC
methodology is described in this section.
switching period T includes a charging phase for duration t
and a discharging phase for duration t
conversion ratio is obtained in Equation 1.
Where:
The NCP1910 uses a proprietary PFC methodology
As shown in Figure 42, the inductor current I
♦
V
bulk
Figure 42. Inductor Current in CCM
is the output voltage of PFC stage,
V
V
bulk
V
in
in
+
+
t
T * t
1
) t
t
T
2
V in
1
2
V
+
bulk
I in
T * t
T
1
Figure 41. CCM PFC Boost Converter
C in
R SENSE
2
. The voltage
L
L
(eq. 1)
http://onsemi.com
I L
in a
1
20
filter absorbs the high−frequency component of inductor
current I
signal only of the inductor current.
Where:
formulated.
where: Z
Equation 3 is constant or varies slowly in the 50 or 60 Hz
bandwidth.
The input filter capacitor C
From Equations 1 and 2, the input impedance Z
Power factor is corrected when the input impedance Z
♦
♦
♦
♦
♦
♦
♦
means it is with a 50 Hz bandwidth of the original
I
V
T is the switching period,
t
t
I
I
I
1
2
L
in
L
L−50
in
.
is the MOSFET on time, and
is the MOSFET off time.
is the inductor current.
L
is the input AC current.
in
is the rectified input voltage,
. It makes the input current I
is input impedance.
supposes a 50 Hz operation. The suffix 50
C bulk
Z
in
+
Bulk voltage (V
V
I
I
in
in
in
+
+ I
T * t
in
L−50
T
and the front−ended EMI
bulk
1
)
I
V
L*50
bulk
in
a low−frequency
(eq. 2)
(eq. 3)
in
in
in
is