VI-HAM™, VE-HAM™

Rev 2.7

Page 6 of 10

08/2017

VxHAMxL

Pin Function / Description (Cont.)

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

at 3mA 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

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.

P/OK

P/OK function is no longer supported.

Component Description

Vicor

Designation

Part Number

C1

0.1µF ceramic, 50V

C2, C3

0.01µF ceramic, 50V

C4

Hold up capacitor,

Available as a HUB

1000 to 6000µF

from Vicor (see

adjoining table)

C5–C8

4,700pF Y2 cap.

01000

C9,C10

0.2µF, 500V

Film or Ceramic

D1

1N4691 zener, 6.2V

D2, D3

1N4006 diode, 800V

00670

D4, D5

1N5817 schottky diode,20V

26108

F1, F2

Use recommended fusing for specific

DC-DC Converters

F3

20A, 250V

R1

50k

R2, R3

250 , 0.25W

R4**

100k , 2W

V1

275V MOV

30076

Z1, Z2

130V Transorb

1.5KE130CA

Z3

150V 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

12.6A

*

+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 100k , 2W resistor is used for every 1,000µF

of hold up capacitance.

Hold up Box (HUB)

Z1

Z2

Z3

10A

10A

2000µF HUB1000-P 1350W

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.

A/S

E/O

P/OK

+OUT

–OUT

19 – 23V

+

–

DO NOT OVERLOAD

or directly connect a capacitor

to the A/S terminal.

Figure 6 — Auxiliary Supply (A/S)