13/18

AN1606 APPLICATION NOTE

B.O.M. for 800W Bridgeless Evaluation Circuit.

#Ferrites Hy_perm.' Diam.=20mm

Note: For the evaluation circuit and external coupled inductor EMC where utilized.

The filter has been achieved as follows: -

Coupled inductor (30 + 30) turns; wire diameter = 0.8mm on a toroidal (40x17x9 mm): -

Magnetizing inductance (each half inductor) Lm=8mH and a leakage inductance, Ld=50

µH.

Scaling down the application.

As a second step, based on the same circuit, a 600W P.F.C. has been built.

The target specification designed for server application is.

600W Target:

1- Wide range input mains 110Vrms to 220Vrms.

2- Output power = 600W.

2- Output voltage = 400Vdc.

The switching frequency has been set at 75kHz to use a reduced size and high performance PowerMOS.

Name

Value

Name

Value

Name

Value

Name

Value

Name

Value

68

Ω

10

Ω

1.8

Ω

100

Ω

5

Ω

2.7 k

Ω

1.5 k

Ω

1 M

Ω

22 k

Ω

25.5 k

Ω

3.9k

Ω

27 k

Ω

220 k

Ω

2.7 k

Ω

5.6 k

Ω

30 k

12 k

Ω

RSN

12

Ω

1

µF

220

µF

330

µF

10 nF

1

µF

1.8 nF

1

µF

120 nF

1 nF

5.6 nF

470 nF

2.7 nF

100 nF

390 nF

NTC

2.5

B57364

F1

20A