NCP1654BD200R2G 查看數據表（PDF） - ON Semiconductor

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NCP1654BD200R2G

Power Factor Controller for Compact and Robust, Continuous Conduction Mode Pre-Converters

ON Semiconductor 

NCP1654

Before Device Operates

After Device Operates

Vin

Vac

IN

+

+

−

RboU

RboL

CBO

Vbo

4

- BO

+

VboH / VboL

VboH = 1.3 V, VboL = 0.7 V

Figure 45. Brown−Out Protection

Hence a larger hysteresis of the brown out comparator is

needed, which is 0.7 V typical in this device. When Vbo

goes below than VBOL (0.7 V typical), the device turns off

the Drive output and keeps it off till Vbo exceeds VBOH

(1.3 V typical). When the device awakes after an off−state

(Undervoltage lockout or shutdown), the default threshold

is VBOH.

Vin

Overpower Limitation (OPL)

This is a second OCP with a threshold that is line

dependent. Sense current Ics represents the inductor current

IL and hence represents the input current approximately.

Input voltage signal Vbo represents the rms input voltage.

The product (Ics ⋅ Vbo) represents an approximated input

power (IL ⋅ Vac). It is illustrated in Figure 46.

RCS ICS

RSENSE

IL

CS

3

4

ICS

+

IL

RSENSE

RCS

Current Mirror

Vbo

+

OPL

>200 mVA?

Figure 46. Over−Power Limitation

When the product (Ics ⋅ Vbo) is greater than a permissible

level 200 mVA, the device turns off the drive output so that

the input power is limited. The OPL is automatically

deactivated when the product (Ics ⋅ Vbo) is lower than the

200 mVA level. This 200 mVA level corresponds to the

approximated input power (IL ⋅ Vac) to be smaller than the

particular expression in (Equation 23).

ǒ Ǔ ǒ Ǔ IcsVbo t 200 mVA

IL

RSENSE

RCS

@

2

Ǹ2 K

p

BO

@

Vac

(eq. 23)

t 200 mVA

Bias the Controller

It is recommended to add a typical 1 nF to 100 nF

decoupling capacitor next to the Vcc pin for proper

operation. When the NCP1654 operates in follower boost

mode, the PFC output voltage is not always regulated at a

particular level under all application range of input voltage

and load power. It is not recommended to make a

low−voltage bias supply voltage by adding an auxiliary

winding on the PFC boost inductor. Alternatively, it is

recommended to get the Vcc biasing supply from the

2nd−stage power conversion stage.

IL @ Vac

t

RCS

RSENSE

@

@

p

KBO

@

50

Ǹ2

mVA

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