NCP1603 ON Semiconductor, NCP1603 Datasheet - Page 23

• Manufacturer Part Number: NCP1603
• Description: PFC/PWM Combo Controller
• Manufacturer: ON Semiconductor

a 9.0 V ESD zener diode. The 3.9 V maximum limit of this
V
control voltage V
inductor current. The circuit in Figure 61 makes
Equations 9 and 10 where the value of resistor R
higher than the value of resistor R
V
obtained from Equations 3 through 10.
circuit output voltage (i.e., bulk voltage V
slowly varying signal. The bandwidth of V
additionally limited by inserting an external capacitor
C
internal 300 kW resistor and the capacitor C
low−pass filter that has a bandwidth f
It is generally recommended to limit the bandwidth below
20 Hz to achieve power factor correction. Typical value of
C
C
control
control
ton
control
The V
control
It is noted that V
In summary, the input impedance Z
Control voltage V
indirectly limits the maximum on time.
V
is 0.1 mF.
(V
to the V
control
control
Figure 61. V
ton
q V
V ton +
10
C control u
Z in +
V ton + V control for CRM
processing circuit generates V
control
control
control
ton
V in
I in
control
control
T V control
is always greater than or equal to
R
t 1 ) t 2
).
pin (Pin 10) in Figure 62. The
+
1
and time information of zero
2p300kW f control
C ramp V control
Processing Circuit
comes from the PFC boost
−
+
closed when zero current
C
2LI ch
1
R
1
2
for DCM
2
(R
control
1
in
>> R
in Equation 11 is
in Equation 12.
control
R
bulk
control
2
3
).
) that is a
1
ton
is much
create a
(eq. 10)
(eq. 12)
(eq. 11)
can be
(eq. 9)
http://onsemi.com
from
V
C
ton
NCP1603
3
23
60 Hz line frequency, the input impedance Z
varying or roughly constant. Then, the power factor
correction is achieved in DCM and CRM.
Maximum Power in PFC Section
Equations 13 and 14 when the circuit efficiency η is
obtained or assumed. The variable V
input voltage.
controls the amount of output power, input power, or input
impedance. The maximum value of the control voltage
V
called maximum power resistor R
defined in Equation 18 and restricted to have a maximum
±10% variation (i.e., 9.5 kW p R
defining the maximum power in an application.
(P
maximum input power P
The suffix ac stands for RMS value.
R power +
control
If the bandwidth of V
Input and output power (P
From Equations 13 and 14, control voltage V
It means that the maximum input and output power
in(max)
The maximum input current I
Regulation Block
V
I ac(max) +
96%
reg
Figure 62. V
is 1.05 V (i.e., V
P in +
P out + h P in +
and P
P in(max) +
P out(max) +
I
ref
V control(max)
I
ref
out(max)
V ac 2
P in(max)
Z in
I ch
I
FB1
V ac
control
V ac 2 C ramp R power
+
) are limited to ±10% variation.
hV ac 2 C ramp R power
control
control(max)
V ac 2 C ramp V control
in(max)
hV ac 2 C ramp V control
+
300k
+
V
Low−Pass Filtering
control
V acC ramp R power
100 mA
1.05 V
2 L
in
is much less than the 50 or
2LI ch
2 L
is also derived in (eq.14).
and P
power
10
2LI ch
= 1.05 V). A parameter
ac(max)
power
2 L
C
ac
+ 10.5 kW
control
out
stands for the RMS
(10.5 kW typical) is
) are derived in
p 11.5 kW) for
V
Processing
Circuit
to deliver the
control
in
is slowly
(eq. 13)
(eq. 14)
(eq. 15)
(eq. 16)
(eq. 17)
(eq. 18)
control