FA5591N 데이터 시트보기 (PDF) - Fuji Electric

부품명

상세내역

제조사

FA5591N

Power Supply Control IC(Power Factor Correction)

Fuji Electric 

FA5590N,FA5591N

(2) Power-factor correction operation

As explained in the switching operation, the

current flowing through the inductor repeats in

triangular waveforms. The mean value (IL 1(mean))

of the triangular wave current becomes 1/2 of the

peak value (IL 1(peak)). (Fig. 3)

By controlling to make outline linking the peak of

the inductor current to sine wave and removing

switching ripple current, the smoothed current

flowing from the AC input power source has sine

wave shape.

IL1(peak)

IL1

IL1(mean)

=1/2×IL1(peak)

FA5590/FA5591 uses fixed on time control

shown in Fig. 4.

This control determines the on time of the output

of IC (gate drive signal for Power Mos) with

combination of the error amplifier output and saw

tooth wave. While the load is constant, the output

of the error amplifier is constant, and on time also

stays constant.

Since an inclination of inductor current depends on

input voltage (an inclination of inductor current is

proportional to input voltage) and on time is

constant, the outline linking the peak of the inductor

current becomes same AC waveform as the input

voltage, which enables power-factor correction

operation.

拡en大larged

2×Iin(peak)

IL1

inpu入t 力vo電lta圧ge

Cfil1tでerスedイtッheチhンigグh に

freq伴ueうnリcッy プcoルntent

by C電1流を除去

eエrラroーr アamンプplifier

出o力utput

Iin

Iin(peak)

MOSFET

Fig.3 Outline of inductor and AC input current

Gate

inductor

current

インダクタ電流

While the output of the error

エラーアンプの出力が一定

(負am荷p一lif定ie)rのis場c合o、nオstンan幅tがand load is

一co定nとstなanるt(,オoンn幅ti固m定e 制sta御y)s constant

(Fixed on time control)

Outline linking the peak

イofンtダピhクーeタクi電nd流uctor current 入力電流のピークが入力

電圧と同じAC波形となる

(力率改善動作)

インaダvクeタr電ag流e waveform of

th平e均inductor current

when the inイdンuダctクoタr 電cu流rrゼenロtのgタoeイsミンdoグwでn

Power Mosがオンし、のこぎり波が

to zero, Power M立OちS上がtuるrn(臨s o界n動a作nd) saw

tooth wave starts to rise

Outline linking the peak of the inductor

current has the same waveform of the

input voltage

(Power factor correction operation)

Fig.4 Fixed on time control

Fuji Electric Co., Ltd.

AN-016E Rev.1.2

April-2011

12

http://www.fujielectric.co.jp/products/semiconductor/

Share Link: