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NCP1654BD133R2G Datasheet(PDF) 15 Page - ON Semiconductor

Part No. NCP1654BD133R2G
Description  Power Factor Controller for Compact and Robust, Continuous Conduction Mode Pre-Converters
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1654BD133R2G Datasheet(HTML) 15 Page - ON Semiconductor

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15
RboL is low side resistor of the dividing resistors between
Vin and BO pin.
RboU is upper side resistor of the dividing resistors between
Vin and BO pin.
Figure 37. Current Sensing
Gnd
+
RSENSE
IL
RCS
ICS
CS
VCS
NCP1654
+
IL
Refer to Figure 37, sense current Ics is proportional to the
inductor current IL as described in (Equation 11). IL
consists of the high−frequency component (that depends on
di/dt or inductor L) and low−frequency component (that is
IL−50).
(eq. 11)
Ics +
RSENSE
RCS
IL
where
RSENSE is the sense resistor to sense IL.
RCS is the offset resistor between CS pin and RSENSE.
Figure 38. Vcontrol Low−Pass Filtering
+
-
VREF
OTA
6
5
Vcontrol
±20 mA
Vout
+
+
VCONTROL(min)
To Vm Pin
Vfb
RZ
CZ
CP
RfbL
RfbU
Vin
Refer to Figure 38, the Operational Trans−conductance
Amplifier (OTA) senses Vout via the feedback resistor
dividers, RfbU and RfbL. The OTA constructs a control
voltage, Vcontrol, depending on the output power and hence
Vout. The operating range of Vcontrol is from
VCONTROL(min) to VCONTROL(max). The signal used for
PFC duty modulation is after decreasing a offset voltage,
VCONTROL(min), i.e. Vcontrol−VCONTROL(min).
This control current Icontrol is a roughly constant current
that comes from the PFC output voltage Vout that is a slowly
varying signal. The bandwidth of Icontrol can be
additionally limited by inserting the external type−2
compensation components (that are RZ, CZ, and CP as
shown in Figure 38). It is recommended to limit fcontrol, that
is the bandwidth of Vcontrol (or Icontrol), below 20 Hz
typically to achieve power factor correction purpose.
The transformer of Vout to Vcontrol is as described in
(Equation 12) if CZ is >> CP. GEA is the error amplifier gain.
Vcontrol
Vout
+
RfbL @ GEARZ
RfbL ) RfbU
@
1 ) sRZCZ
sRZCZ(1 ) sRZCP)
(eq. 12)
From (Equation 7) − (Equation 11), the input impedance
Zin is re−formulated in (Equation 13).
Zin +
2 RMRSENSEVoutVacKBOIL
2pRCS @ (Vcontrol * VCONTROL(min)) @ VREFIL*50
(eq. 13)
When IL is equal to IL−50, (Equation 13) is re−formulated
in (Equation 14)
Zin +
2 RMRSENSEVoutVacKBO
2pRCS @ (Vcontrol * VCONTROL(min)) @ VREF
(eq. 14)
The multiplier capacitor CM is the one to filter the
high−frequency component of the multiplier voltage Vm.
The high−frequency component is basically coming from
the inductor current IL. On the other hand, the filter
capacitor Cfilter similarly removes the high−frequency
component of inductor current IL. If the capacitors CM and
Cfiltermatch with each other in terms of filtering capability,
IL becomes IL−50. Input impedance Zin is roughly constant
over the bandwidth of 50 or 60 Hz and power factor is
corrected.


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