Vicor Corp.

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

HAM, High-Boost Harmonic Attenuation Module

Rev. 2.5

Page 6 of 10

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A/S

The HAM provides a low voltage non isolated output Auxiliary

Supply (A/S) that may be used to power primary side control

and monitoring circuitry. This output is 19 – 23 Vdc, referenced

to -OUT, at 3 mA max. Do not overload or short this output as

the HAM will fail. A typical use for A/S is to power an optical

coupler that isolates the Power OK signal (Figure 6).

E/O

The Enable Output (E/O) is used to inhibit the DC-DC

converters at start up until the hold up capacitors are charged,

at which time Enable is asserted high (open state, Figure 8).

If the AC line fails, E/O goes low when the DC output of the

HAM drops below 250 Vdc.

E/O must be connected to the Gate Input of all VI-26x and

VI-J6x drivers and / or the PC pin of the V375 DC-DC converters

(Figure 4); failure to do so may cause the converters to toggle

on and off. If an external load is connected directly to the

output of the HAM, do not apply the load until the output hold

up capacitor(s) are fully charged.

In applications using VI-26x drivers and VI-26x boosters, the

E/O pin should be connected to the Gate In pin of the driver

module only, it is not necessary to connect this pin to boosters

as they are controlled by their respective driver.

The E/O pin ancillary circuitry illustrated in Figures 4 and 5

provides transient immunity. The illustrated circuitry is the

minimum required, see Figures 4 and 5.

Component

Description

Vicor

Designation

Part Number

C1

0.1 μF ceramic, 50 V

C2, C3

0.01 μF ceramic, 50 V

C4

Hold up capacitor,

Available as a HUB

1000 to 6000 μF

from Vicor (see

adjoining table)

C5–C8

4,700 pF Y2 cap.

01000

C9,C10

0.2 μF, 500 V

Film or Ceramic

D1

1N4691 zener, 6.2 V

D2, D3

1N4006 diode, 800 V

00670

D4, D5

1N5817 schottky diode, 20 V

26108

F1, F2

Use recommended fusing for specific

DC-DC Converters

F3

20 A, 250 V

R1

50 KΩ

R2, R3

250 Ω, 0.25 W

R4**

100 KΩ, 2 W

V1

275 V MOV

30076

Z1, Z2

130 V Transorb

1.5KE130CA

Z3

150 V Transorb

1.5KE150CA

+IN

V375 DC-DC Converters

PC

PR

-IN

-IN

F2

+IN

F1

PC

PR

R1

R2

R3

C3

D3

D5

D1

D2

D4

C2

C4

C5

C6

C7

C8

JMK Filter

P/N 1319-13

12.6 A

*

+IN

GATE IN

GATE OUT

-IN

+OUT

-OUT

P/OK

E/O

A/S

VI-HAMD-xL

GATE IN

GATE OUT

-IN

+IN

+OUT

-OUT

VI-BAMD-xL

Input

Bridge

Rectifier

Vicor P/N 30660

L1

GND

L2/N

L1

L2/N

1N4006

1N4006

F3

R4

**

C1

V1

C9

C10

* Consult Vicor's Applications Engineering for specific

HAMD / BAMD filtering information.

** A 100 KΩ, 2 W resistor is used for every 1,000 μF

of hold up capacitance.

Hold up Box (HUB)

Z1

Z2

Z3

10 A

10 A

2000 μF HUB1000-P 1350 W

Figure 5 — Connection Diagram, HAMD / BAMD / V375 DC-DC Converters

HAMD-CL Driver HAM: No internal bridge rectifier or synchronization diodes.

BAMD-CL Booster HAM: Companion module to HAMD-CM used for additional output power. No internal bridge rectifier.

+OUT

P/OK

–OUT

E/O

A/S

18 k

Ω, 1/4 W

"Power OK" Status

Low = OK

A/S

E/O

P/OK

+OUT

–OUT

IAS ≤ 3 mA

19 – 23 V

+

–

DO NOT OVERLOAD

or directly connect a capacitor

to the A/S terminal.

Figure 6 — Auxiliary Supply (A/S)

PIN FUNCTION / DESCRIPTION (CONT.)