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=

(8)

The output capacitance must be calculated by two

different methods. The first equation determines the

capacitor value based on the allowable ripple voltage at

the minimum line frequency. It is important to remember

that the scaled version of this ripple is present at the FB

pin. The feedback voltage is continuously monitored by

the non-latching over voltage protection circuit. Its

threshold is about 8% higher the nominal output voltage.

To avoid triggering the OVP protection during normal

operation, V

OUT,RIPPLE

should be limited to less 12% of

the nominal output voltage, V

OUT

.

The second expression yields the minimum output

capacitance based on the required hold-up time based

on the power supply specification. Ultimately, the larger

of the two values satisfies both design requirements and

has to be selected for C

OUT

.

Step 5

: Boost Inductance per Channel

CH

MAX,

OUT

MIN

SW,

OFF

LINE,

OUT

2

OFF

LINE,

OFF

LINE,

P

V

f

2

V

2

V

?/DIV>

L

?/DIV>

=

(9)

CH

MAX,

OUT

SW,MIN

LINE,MAX

OUT

2

LINE,MAX

P

V

f

2

V

2

V

?/DIV>

L

?/DIV>

=

(10)

The minimum switching frequency can occur either at

the lowest or at the highest input line voltage.

Accordingly, two boost inductor values are calculated

and the lower of the two inductances must be selected.

This L value keeps the minimum operating frequency

above f

SW,MIN

under all operating conditions.

Step 6

: Maximum On-Time per Channel

2

OFF

LINE,

CH

MAX,

MAX

ON,

V

?/DIV>

P

L

2

t

?/DIV>

=

(11)

Step 7

: Peak Inductor Current per Channel

ON,MAX

OFF

LINE,

L,PK

t

L

V

2

I

?/DIV>

=

(12)

Step 8

: Maximum DC Output Current

OUT

CH

MAX,

OUT,MAX

V

P

2

I

?/DIV>

=

(13)

Step 9

: Zero Current Detect Resistors

0.5mA

N

V

0.5

R

OUT

ZCD2

ZCD1

?/DIV>

=

(14)

where 0.5?/SPAN>V

OUT

is the maximum amplitude of the

resonant waveform across the boost inductor during

zero current detection; N is the turns ratio of the boost

inductor and the auxiliary winding utilized for the zero

current detection; and 0.5 mA is the maximum current

of the ZCD pin during the zero current detection period.

Step 10

: Maximum On-Time Setting

Resistor

MAX

ON,

6

MOT

t

10

4340

R

?/DIV>

=

(15)

where R

MOT

should be between 40 k?and 130 k?

Step 11

: Output Voltage Setting Resistors

(Feedback)

FB

OUT

FB2

I

3V

P

V

3V

R

=

?/DIV>

=

(16)

where 3 V is the reference voltage of the error amplifier

at its non-inverting input and P

FB

or I

FB

are selected by

the designer. If the power loss associated to the

feedback divider is critical to meet stand-by power

consumption regulations, it might be beneficial to start

the calculation by choosing P

FB

. Otherwise, the current

of feedback divider, I

FB

should be set to approximately

0.4 mA at the desired output voltage set point. This

value ensures that parasitic circuit board and pin

capacitances do not introduce unwanted filtering effect

in the feedback path.

If the feedback divider is used to provide startup power

for the FAN9612 (see AN-6086 for implementation

details

), the following equation is used to calculate R

FB2

:

(

)

OUT

ON

LINE,

FB2

V

0.12mA

0.7V

3

12.5V

V

2

3V

R

?/DIV>

+

?/DIV>

=

(17)

where 3 V is the reference voltage of the error amplifier

at its non-inverting input; 12.5 V is the controllers

UVLO turn-on threshold; 0.12 mA is the worst-case

startup current required to start operation; and 3?/SPAN>0.7 V

accounts for the forward voltage drop of three diodes in

series of the startup current. Once the value of R

FB2

is

determined, R

FB1

is given by the following formula:

FB2

OUT

FB1

R

1

3V

V

R

?/DIV>

=

(18)

R

FB1

can be implemented as a series combination of two

or three resistors; depending on safety regulations,

maximum voltage, and or power rating of the selected

resistor type.

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型號(hào)：	FAN9612MX
廠商：	Fairchild Semiconductor
文件頁數(shù)：	24/36頁
文件大?。?/td>	1561K
描述：	IC CTLR PFC DUAL BCM 16SOICN
標(biāo)準(zhǔn)包裝：	1
模式：	臨界傳導(dǎo)（BCM）
頻率 - 開關(guān)：	16.5kHz ~ 525kHz
電流 - 啟動(dòng)：	80µA
電源電壓：	9 V ~ 18 V
工作溫度：	-40°C ~ 125°C
安裝類型：	表面貼裝
封裝/外殼：	16-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝：	16-SOIC N
包裝：	標(biāo)準(zhǔn)包裝
其它名稱：	FAN9612MXFSDKR

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