SMFL2805SSLASHKR datasheet(2/15 Pages) INTERPOINT

2 / 15 page

SenSe anD trim

Single output models provide sense to maintain voltage at the

load. The converters output voltage can also be trimmed up. See

Figure 1.

current Sharing anD Parallel OPeratiOn

For increased power parallel up to 3 converters. The maximum

recommended power is 80% of the total available power. Multiple

SMFL converters may be used in parallel to drive a common

load. Only single output models with Sense and Sense Return

can be used in the share mode. In this mode of operation the

load current is shared by two or three SMFL converters.

In current sharing mode, one SMFL converter is designated as a

master. The Slave pin (pin 11) of the master is left unconnected

and the Master/Inhibit 2 pin (pin 12) of the master is connected to

the Slave pin (pin 11) of the slave units.

The units designated as slaves have the Master/Inhibit 2 pin (pin

12) connected to the Sense Return pin (pin 9) of the master unit.

Figure 2 on page 3 shows the typical setup for two or three

units in parallel.

A second slave unit may be placed in parallel with a master and

slave; this requires the Triple pin (pin 3) of the master unit to be

connected to the Sense Return pins (pin 9) shown in Figure 2 on

page 3.

In current sharing mode, the converters function as a current

source. For this reason it is important that their outputs be

connected to the common ground at all times to prevent an

excessively high voltage at their outputs.

REMOTE SENSE CONNECTION

–

28V

–

Inhibit

Sync In

OUTPUT VOLTAGE ADJUST CONNECTION

28V

–

Inhibit

Sync In

Positive Input

Input Common

Triple (TRI)

Inhibit 1

Sync Out

Sync In

Master/Inhibit 2

Slave

Positive Sense

Sense Return

Output Common

Positive Output

Positive Input

Input Common

Triple (TRI)

Inhibit 1

Sync Out

Sync In

Master/Inhibit 2

Slave

Positive Sense

Sense Return

Output Common

Positive Output

–

Figure 1: SenSe cOnnectiOnS anD trim table – Single OutPut mODelS

Notes

1. When using remote sense for voltage

compensation or when using remote sense

for trim, the output will drift over temperature.

Contact Applications Engineering for more

information powerapps@crane-eg.com.

2. Do not exceed the maximum rated power.

VOuT INCREASE

RA (Ω)

VOLTS

3.3 V

5 V

12 V

15 V

0.1

0.2

131

153

0.3

196

230

0.4

262

307

109

0.5

349

396

139

109

Crane Aerospace & Electronics Power Solutions

www.craneae.com/interpoint

Page 2 of 15

sMFL single and dual dc-dc converters

28 VoLt input – 65 Watt

SMFL Rev AC - 2016.02.17

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