NCP1601BDR2 datasheet(11/18 Pages) ONSEMI

Part #	NCP1601BDR2

Description	Compact Fixed Frequency Discontinuous or Critical Conduction Voltage Mode Power Factor Correction Controller

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP1601A, NCP1601B

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11

Vton + Vcontrol

(eq.5b)

for CRM

It is noted that Vton is always greater than or equal to

Vcontrol (i.e., Vton

≥ Vcontrol).

In summary, the input impedance Zin in (eq.6) is obtained

from (eq.1)−(eq.5)

Zin +

Vin

Iin

+

2LIch

Cramp Vcontrol

(eq.6)

Control voltage Vcontrol comes from the PFC output

voltage Vout which is a slowly varying signal. The

bandwidth of Vcontrol can be additionally limited by

inserting an external capacitor Ccontrol to the Vcontrol pin

(Pin 2) in Figure 28. The internal 300 k

W resistor and the

capacitor Ccontrol create a low−pass filter which has a

bandwidth fcontrol in (eq.7). It is generally recommended to

limit the bandwidth below 20 Hz to achieve power factor

correction. Typical value of Ccontrol is 0.1

mF.

Ccontrol u

1

2

p300kW fcontrol

(eq.7)

If the bandwidth of Vcontrol is much less than the 50 or

60 Hz line frequency, the input impedance Zin is slowly

varying or roughly constant. Then, the power factor

correction is achieved in DCM and CRM.

Figure 30. Vcontrol Low−Pass Filtering

300k

Regulation Block

2

Ccontrol

Vcontrol

Vreg

Iref

96%

IFB

Vcontrol

Processing

Circuit

Maximum Power

Input and output power (Pin and Pout) are derived in

(eq.8) when the circuit efficiency

h is obtained or assumed.

The variable Vac stands for the RMS input voltage.

(eq.8a)

Pin +

Vac2

Zin

+

Vac2CrampVcontrol

2LIch

(eq.8b)

Pout + h Pin +

hVac2CrampVcontrol

2LIch

From (eq.8), control voltage Vcontrol controls the amount

of output power, input power, or input impedance. The

maximum value of the control voltage Vcontrol is 1.05 V

(i.e., Vcontrol(max) = 1.05 V). A parameter called maximum

power resistor Rpower (10.5 k

W typical) is defined in (eq.9)

and restricted to have a maximum

±10% variation

(i.e., 9.5 k

W ≤ Rpower ≤ 11.5 kW) for defining the maximum

power in an application.

Rpower +

Vcontrol(max)

Ich

+

1.05 V

100

mA +

10.5 k

W

(eq.9)

It means that the maximum input and output power

(Pin(max) and Pout(max)) are limited to

±10% variation.

(eq.10a)

Pin(max) +

Vac2CrampRpower

2L

(eq.10b)

Pout(max) +

hVac2CrampRpower

2L

The maximum input current Iac(max) to deliver the

maximum input power Pin(max) is also derived in (eq.11).

The suffix ac stands for RMS value.

(eq.11)

Iac(max) +

Pin(max)

Vac

+

VacCrampRpower

2L

Output Feedback

The output voltage Vout of the PFC circuit is sensed as a

feedback current IFB flowing into the FB pin (Pin 1) of the

device. The FB pin voltage VFB1 is typically less than 5 V

referring to Figure 11. It is much lower than Vout which is

typically 400 V. Therefore, VFB1 is generally neglected.

(eq.12)

IFB +

Vout * VFB1

RFB

[

Vout

RFB

where RFB is the feedback resistor connected between the

FB pin (Pin 1) and the output voltage referring to Figure 2.

Then, the feedback current IFB represents the output

voltage Vout and will be used in the output voltage

regulation,

Undervoltage

Protection

(UVP),

and

Overvoltage Protection (OVP).

Output Voltage Regulation

Feedback current IFB, which presents output voltage

Vout, is regulated with a reference current (Iref = 203

mA

typical) as shown in Figure 31.

Figure 31. Regulation Block

Vreg

Iref

96%

IFB

1.05 V

When IFB is lower than 96% of Iref, the Vreg which is the

output of the regulation block is as high as Vcontrol(max)

(1.05 V typical) that gives the maximum value on Vton. As

a result, it gives the maximum MOSFET on time and Vout

increases. When IFB is higher than Iref, the Vreg becomes 0

V that gives no MOSFET on time and Vout decreases. As

a result, the output voltage Vout is regulated around the

range between 96% and 100% of the nominal value of RFB

× Iref.

Based on (eq.8) for a particular power level, the Vcontrol

is inversely proportional to Vac2. Hence, in high Vac

condition Vcontrol is lower. It means that IFB or output

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