Vicor Corp.

Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715

HAM, High-Boost Harmonic Attenuation Module

Rev. 2.5

Page 8 of 10

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Line Filter for High Boost HAM

A line filter is required to provide attenuation of conducted

emissions generated by the HAM module and to protect it from

line transients. It also presents a well defined high frequency AC

line impedance to the input of the HAM. To meet the listed

specifications, Vicor’s P/N 30205 line filter/transient suppressor

or equivalent must be used, see Figure 10. The addition of a

MOV external to this filter is required to meet normal mode

transient surge requirements.

For applications using HAMD + BAMD or where the user

desires to construct a custom HAM filter, the filter should be

designed following Figure 10, the schematic of Vicor’s P/N

30205 filter. The current carrying capability of the inductors must

be scaled proportionally to the number of HAM modules used.

Inductance values must be selected according to Table 1. These

limits are to ensure proper operation of the HAM and do not

guarantee a system will meet conducted emissions specifications.

For applications requiring magnetic field shielding, do not place

a ferrous EMI shield over the plastic cover of the HAM module.

This can cause thermal problems due to induction heating effects.

FACE MAY BE

BOWED 0.04 MAX

4-40 INSERT

0.25 DP 4 PL

ø0.080 PIN

6 PLACES

0.900

0.100

1.200

0.500

0.500

4.60

±0.02

0.060

1.00

MAX

0.13

±0.02

1.45

±0.02

2.800

2.50

2.00

0.30

±0.02

1.800

2.40

±0.02

Figure 11 — HAM filter #30205 mechanical diagram

90

80

70

60

50

40

CURRENT (AMPS)

RATED CURRENT VS AMBIENT TEMPERATURE

1.0

2.0

3.0

4.0

5.0

6.0

7.0

Figure 12 — HAM filter #30205 current rating vs. temperature

90

80

70

60

50

40

30

20

10

0

DM

CM

0.01

0.04

0.1

0.4

1

4

10

40

100

0.02

0.07

0.2

0.7

2

7

20

70

FREQUENCY (MEGAHERTZ)

Figure 13 — HAM filter #30205 insertion loss vs. frequency

R

Cx

LD

LC

Cy

Cy

D1

D2

D3

HAM Filter P/N 30205

R = 235 KΩ D1,2 = 1.5KE130CA D3 = 1.5KE150CA

MOV

*

P/N 30076

Cx = 1.5 uF(x2)SH Cy = 0.01 uF, Y2 type LC = 6.9 mH LD = 0.72 mH

*MOV required external to filter to meet normal mode transient surge requirements

Figure 10 — Required HAM filter, Vicor part # 30205

Parameter

Min

Typ

Max

Unit

Differential Mode

0.2

0.35

0.75

mH

Inductance (LD)

Common Mode

36

mH

Inductance (LC)

Table 1 — HAM filter inductance range

PIN FUNCTION / DESCRIPTION (CONT.)