Parallel and Series Connec�on

PST26 Rev. 00

Page 4 of 11

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Redundant Systems Opera�on

Hold-up �me

The converters provide internal hold-up �me (see curve).

Hot Swap

The hot swap is not recommended because of the inrush current. Ne-

vertheless with some external cau�ons it may be possible. We recom-

mend to consult our technical support before opera�ng in this mode.

Output Current Limita�on

All outputs are con�nously protected against short-circuit by a constant

current limita�on.(no foldback)

Thermal Considera�ons

When a converter is mounted in free air, in convec�on cooling, and is

opera�ng at its nominal output power at the max. ambiant temperatu-

re, the temperature measured on the heatsink should not exeed 95°C.

The dera�ng curves show the max power available from the converter

versus ambiant temperature.

Thermal protec�on

A temperature protec�on is integrated in each Vicor module, disabling

output when heatsink temperature exceeds 105°C the converter auto-

ma�cally restarts, when the temperature drops below this limit. Never-

theless, exeeding the max opera�ng temperature may cause failures of

the converter.

25

50

75

100

125

150

175

200

225

250

275

300

325

350

375

400

-20

0°C

20°C

40°C

60°C

80°C

T°C

PST26300 Output power vs Ambiant temp.

Free air

2 m/s

A converter output can be connected in series with an output from a

separate converter, an external diode across each output is required.

The maximum output current of a serial-connected outputs is limited

by the output with the lowest current limit.Output voltages above 48V

(SELV - Safety Extra Low Voltage) require addi�onal safety measures in

order to comply with interna�onal safety requirements.

Parrallel opera�on is possible with the addi�on of external diodes in

series with each output.

When systems require a very high level of reliability and should work

normally in the event of a failure, N+1 redundancy is implemented

where N is the number of converter to support power requirement.

If one converter fail, the remaining ones s�ll delivers the power to the

loads.

External diodes are required with the PST26 to ensure proper N+1

opera�on .

25

50

75

100

125

150

175

200

225

-20

-10

0°C 10°C 20°C 30°C 40°C 50°C 60°C 70°C 80°C 85°C

T°C

PST26150 Output power vs ambiant temp.

Free air

2m/s