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NCP1654BD133R2G Datenblatt(PDF) 14 Page - ON Semiconductor

Teilenummer NCP1654BD133R2G
Bauteilbeschribung  Power Factor Controller for Compact and Robust, Continuous Conduction Mode Pre-Converters
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Hersteller  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
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Vramp is the internal ramp voltage, the positive input of the
PFC modulation comparator,
Vm is the multiplier voltage appearing on Vm pin,
Ich is the internal charging current,
Cramp is the internal ramp capacitor, and
VREF is the internal reference voltage, the negative input of
the PFC modulation comparator.
Ich, Cramp, and VREF also act as the ramp signal of
switching frequency. Hence the charging current Ich is
specially designed as in (Equation 5). The multiplier
voltage Vm is therefore expressed in terms of t1 in
(Equation 6).
(eq. 5)
Ich +
CrampVREF
T
(eq. 6)
Vm + VREF *
t1
Cramp
CrampVREF
T
+ VREF
T * t1
T
From (Equation 3) and (Equation 6), the input impedance
Zin is re−formulated in (Equation 7).
(eq. 7)
Zin +
Vm
VREF
Vout
IL*50
Because VREF and Vout are roughly constant versus time,
the multiplier voltage Vm is designed to be proportional to
the IL−50 in order to have a constant Zin for PFC purpose.
It is illustrated in Figure 34.
Figure 34. Multiplier Voltage Timing Diagram
Time
Time
Time
VM
IL
Iin
Vin
It can be seen in the timing diagram in Figure 33 that Vm
originally consists of a switching frequency ripple coming
from the inductor current IL. The duty ratio can be
inaccurately generated due to this ripple. This modulation
is the so−called “peak current mode”. Hence, an external
capacitor CM connected to the multiplier voltage Vm pin is
essential to bypass the high−frequency component of Vm.
The modulation becomes the so−called “average current
mode” with a better accuracy for PFC.
Figure 35. External Connection on the Multiplier
Voltage Pin
PFC Duty
Modulation
Vm +
RMIcsVbo
4(Vcontrol * VCONTROL(min))
RM
CM
Vm
Im
2
The multiplier voltage Vm is generated according to
(Equation 8).
(eq. 8)
Vm +
RMIcsVbo
4(Vcontrol * VCONTROL(min))
Where,
RM is the external multiplier resistor connected to Vm pin,
which is constant.
Vbo is the input voltage signal appearing on the BO pin,
which is proportional to the rms input voltage,
Ics is the sense current proportional to the inductor current
IL as described in (Equation 11).
Vcontrol is the control voltage signal, the output voltage of
Operational Trans−conductance Amplifier (OTA), as
described in (Equation 12).
RM directly limits the maximum input power capability
and hence its value affects the NCP1654 to operate in either
“follower boost mode” or “constant output voltage mode”.
Figure 36. External Connection on the Brown Out Pin
Vbo
BO
4
+
RboL
Vin
RboU
CBO
+
-
VboH / VboL
VboH = 1.3 V, VboL = 0.7 V
Refer to Figure 36,
(eq. 9)
Vbo + KBO(Vin) + KBO @
22
p Vac
(eq. 10)
KBO +
RboL
RboU ) RboL
where
Vbo is the voltage on BO pin.
KBO is the decay ratio of Vin to Vbo.
<Vin> is the average voltage signal of Vin, the voltage
appearing on Cfilter.
Vac is the RMS input voltage.


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