MC34261 데이터 시트보기 (PDF) - ON Semiconductor

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MC34261

POWER FACTOR CONTROLLERS

ON Semiconductor 

2X Step−Up

Isolation

Line

Transformer

115 Vac

Input

Neutral

Autoformer

MC34261, MC33261

Figure 17. Power Factor Test Set−Up

AC POWER ANALYZER

PM 1000

HI

HI

IO

W VA PF Vrms Arms A

0 1235

V

0.1

Vcf Acf Ainst FREQ HARM

7 9 11 13

LO

LO

Voltech

RFI Filter

T

0.005

1.0

0.005

0 to 270 Vac

Output Power Factor

Controller Circuit

Earth

An RFI filter is required for best performance when connecting the preconverter directly to the AC line. Commercially available two stage filters

such as the Delta Electronics 03DPCG5 work excellent. The simple single stage test filter shown above can easily be constructed with a common

mode transformer. Transformer (T) is a Coilcraft CMT3−28−2 with 28 mH minimum inductance and a 2.0 A maximum current rating.

Figure 18. Soft−Start Circuit

+

0.5 mA

2

To VO

1

+

C

1.0M

To VCC

tSoft−Start ≈ 9000C in μF

Startup overshoot can be eliminated with the

addition of a Soft−Start circuit.

Figure 19. Error Amp Compensation

10μA

Error

Amp

+

R2

1

R1

6

2

C1

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