MC33368P Datasheet MC33368DG, MC33368P, MC33368D | P13-P15

MC33368

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13

Figure 18. Power Factor Test Setup

10

AC Power

Analyzer

PM 1000

A V

Voltech

EMI Filter

T

2X Step−up

Isolation

Transformer

Autoformer

115 Vrms

Input

Line

Neutral

0 to 270 Vac

Output to

Power Factor

Correction

Circuit

HI HI

L.O. L.O.

0.1 1.0

WVAPFV

rms

A

rms

V

D

Acf Ainst Freq HARM

An RFI filter is required for best performance when connecting the preconverter directly to the ac line. The filter attenuates the level of high

frequency switching that appears on the ac line current waveform. Figures 16 and 17 work well with commercially available two stage filter

s

such as the Delta Electronics 03DPCG6. Shown above is a single stage test filter that can easily be constructed with four ac line rated

capacitors and a common−mode transformer. Coilcraft CMT3−28−2 was used to test Figures 16 and 17. It has a minimum inductance of 28 mH

and a maximum current rating of 2.0 A. Coilcraft CMT4−17−9 was used to test Figure 20. It has a minimum inductance of 17 mH and a

maximum current rating of 9.0 A. Circuit conversion efficiency η (%) was calculated without the power loss of the RFI filter.

Figure 19. On/Off Control

Multiplier

8

C1

22

Frequency

Clamp

R

S

Q

R

S

Timer R

V

ref

Leading Edge

Blanking

Low

Load Detect

Comp FB

6

LEB

13

PGND

Gate

ZCD

V

CC

Line

RD

AGND

MC33368

16

12

7

11

10

FC

9

314

Quickstart

Overvoltage

Comparator

Set Dominant

1.5 V

15 V

Q

5.0 V

Reference

DC

Out

D5

C3

330

MTW14N50E

Q1

D6

C4

100

T

R4

22 k

EMI

Filter

92 to

270 Vrms

R7

0.1

C5

1.0

R5

1.3 M

R3

10 k

C2

0.01

R1

10 k

R2

820 k

R8

10 k

C9

330 mF

D1 D3

D2 D4

R11

10

15 V

C6

0.1

13/8.0

UVLO

1.2/1.0

R13

51

D8

R

S

Latch

V

ref

V

ref

V

ref

CS

2

5

Mult

V

CC

6.9 V

1.0 k

10 k

1.0 k

2N3904

1N4148

On/Off

Input

Zero

Current

Detect

1.08 x V

ref

5.0 V Off

0 V On

MC33368

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14

Figure 20. 400 W Power Factor Controller

Multiplier

8

C1

1.0

Frequency

Clamp

R

S

Q

R

S

Timer R

V

ref

Leading Edge

Blanking

Low

Load Detect

Comp FB

6

LEB

13

PGND

Gate

ZCD

V

CC

Line

RD

AGND

MC33368

16

12

7

11

10

FC

9

314

Quickstart

Overvoltage

Comparator

Set Dominant

1.5 V

15 V

Q

5.0 V

Reference

400 V

MUR460

D5

C3

330

MTW20N50E

Q1

D6

C4

100

T

R4

22 k

EMI

Filter

92 to

270

Vac

R7

0.1

C5

1.0

R5

1.3 M

R3

10.5 k

C2

0.01

R1

10 k

R2

820 k

R8

1.0 M

C9

330 mF

D1 D3

D2 D4

R11

10

15 V

C6

0.1

13/8.0

UVLO

1.2/1.0

R13

51

D8

R

S

Latch

V

ref

V

ref

V

ref

CS

2

5

Mult

1.5 V

Zero

Current

Detect

1.08 x V

ref

1N5406

R10

10 k

C7

470 pF

V

ref

C8

0.001

R9

10

1N4744

1N4934

MC33368

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15

Figure 21. Printed Circuit Board and Component Layout

(Circuits of Figures 16 and 17)

DC Output

C6

R3

C2

D1

D3

AC Input

C5

Transformer

D5

DGS

D8

J

R10

C7

C9

R2

R8

C1

R4

C8

D6

R6

D2 D4

R5

R1

D7

IC1

R11

R9

J

R13

R7

C4

Q1

(Top View)

(Bottom View)

4.5″

3.0″

MC33368

C3

J = Jumper

MC33368P

MC33368P

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