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NCP1654BD133R2G Datasheet(PDF) 16 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) 16 Page - ON Semiconductor

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NCP1654
http://onsemi.com
16
Input and output power (Pin and Pout) are derived in (Equation 15) when the circuit efficiency η is obtained or assumed.
The variable Vac stands for the rms input voltage.
Pin +
Vac 2
Zin
+
2pRCS @ (Vcontrol * VCONTROL(min)) @ VREF @ Vac
2 RMRSENSEVoutKBO
(eq. 15)
T
(Vcontrol * VCONTROL(min))Vac
Vout
Pout + h Pin + h
2pRCS @ (Vcontrol * VCONTROL(min)) @ VREF @ Vac
2 RMRSENSEVoutKBO
(eq. 16)
T
(Vcontrol * VCONTROL(min))Vac
Vout
Follower Boost
The “Follower Boost” is an operation mode where the
pre−converter output voltage stabilizes at a level that varies
linearly versus the ac line amplitude. This technique aims
at reducing the gap between the output and input voltages
to optimize the boost efficiency and minimize the cost of
the PFC stage (refer to MC33260 data sheet for more
details at
http://www.onsemi.com ).
The NCP1654 operates in follower boost mode when
Vcontrol is constant, i.e. Vcontrolraises to its maximum value
VCONTROL(max). Re−formulate (Equation 16) to become
(Equation 17) and (Equation 18) by replace Vcontrol by
VCONTROL(max). If Vcontrol is constant based on
(Equation 15), for a constant load or power demand the
output voltage Vout of the converter is proportional to the
rms input voltage Vac. It means the output voltage Vout
becomes lower when the rms input voltage Vac becomes
lower. On the other hand, the output voltage Vout becomes
lower when the load or power demand becomes higher.
Pout + h
2pRCS @ (VCONTROL(max) * VCONTROL(min)) @ VREF @ Vac
2 RMRSENSEVoutKBO
(eq. 17)
+ h
2pRCS @ DVCONTROL @ VREF @ Vac
2 RMRSENSEVoutKBO
Vout + h
2pRCS @ DVCONTROL @ VREF
2 RMRSENSEKBO
@
Vac
Pout
(eq. 18)
where
VCONTROL(max) is the maximum control voltage.
DVCONTROL is the gap between VCONTROL(max) and
VCONTROL(min).
It is illustrated in Figure 39.
Figure 39. Follower Boost Characteristics
Vout (Traditional Boost)
Vout (Follower Boost)
Vin
Pout
Time
Time
Follower Boost Benefits
The follower boost circuit offers and opportunity to
reduce the output voltage Vout whenever the rms input
voltage Vac is lower or the power demand Pout is higher.
Because of the step−up characteristics of boost converter,
the output voltage Vout will always be higher than the input
voltage Vin even though Vout is reduced in follower boost
operation. As a result, the on time t1 is reduced. Reduction
of on time makes the loss of the inductor and power
MOSFET smaller. Hence, it allows cheaper cost in the
inductor and power MOSFET or allows the circuit
components to operate at a lower stress condition in most
of the time.
Reference Section
The internal reference voltage (VREF) is trimmed to be
±2% accurate over the temperature range (the typical value
is 2.5 V). VREF is the reference used for the regulation.
VREF also serves to build the thresholds of the fast transient
response, Overvoltage (OVP), brown out (BO), and
Undervoltage protections (UVP).
Output Feedback
The output voltage Vout of the PFC circuits is sensed at
Vfb pin via the resistor divider (RfbL and RfbU) as shown in
Figure 38. Vout is regulated as described in (Equation 19).
Vout + VREF
RfbU ) RfbL
RfbL
(eq. 19)


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