JUN 06, 2006 revised to JUL 25, 2006

Page 9 of 12

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HHS60 DC-DC Series Data Sheet

48VDC Input, 60 Amp Half-Brick Converter

An open collector switch is recommended to control

the voltage between the ON/OFF pin and the -Vin

pin of the converter. The ON/OFF pin is pulled up

internally, so no external voltage source is required.

The user should avoid connecting a resistor between

the ON/OFF pin and the +Vin (# 4) pin.

When the ON/OFF pin is used to achieve remote

control, the user must take care to insure that the pin

reference for the control is actually the -Vin pin. The

control signal must not be referenced ahead of EMI

filtering, or remotely from the unit. Optically coupling

the information and locating the optical coupler

directly at the module will solve any of these

problems.

Note:

If the ON/OFF pin is not used, it can be left floating (positive logic),

or connected to the -Vin pin (negative logic).

Remote Sense

The HHS60 Series converters have the capability to

remotely sense both lines of the output. This feature

moves the effective output voltage regulation point

from the output of the unit to the point of connection

of the remote sense pins. This feature automatically

adjusts the real output voltage of the converter in

order to compensate for voltage drops in distribution

and maintain a regulated voltage at the point of load.

This is shown in Figures 16 & 17.

If the remote sense feature is not to be used, the

sense pins should be connected locally.

The

+Sense (#8) pin should be connected to the +Vout

(#9) pin directly at the output of the converter and the

–Sense (#6) pin should be connected to the -Vout

(#5) pin directly at the output of the converter.

If sense pins are not connected to load, or the

respective output pins, the converter will not be

damaged, but may not meet the output voltage

regulation specifications.

Output Voltage Trim

The trim feature allows the user to adjust the output

voltage from the nominal value. This can be used to

compensate for distribution drops, perform margining

in production, or accommodate other requirements

when output voltage needs to be adjusted from the

nominal value. There are two trim options available

in the HHS60 Series.

Negative Trim (No P/N suffix)

All HHS60 negative-trim models trim up with a

resistor connected from the TRIM (#7) pin to the

(-) Sense (#6) pin and trim down with a resistor from

the TRIM pin to the (+) Sense (#8) pin as shown in

Figure 16.

Figure 16

. HHS60 Series Negative Trim Schematic

The following equation determines the required

external resistor value to obtain an output voltage

change of

Δ%.

Vo*(100-

Δ%)-122.5

Vo*

Δ%

122.5*R1

Vo*

Δ%

Where R1 and R2 are constants from the table

below

Model

R1 (k

Ω)

R2 (k

Ω)

HHS60ZA

0. 223

0.15

HHS60ZB

0.474

1

HHS60ZD

1.039

3.92

HHS60ZE

4.220

5.11