Output characteristics

Power supplies

Power supplies for d.c. control circuits

Phaseo® regulated switch mode power supplies

Derating

The ambient temperature is a determining factor which limits the power that an electronic power supply can deliver continuously. If the temperature around the electronic components is too high, their life will be significantly reduced. Conversely, a power supply can deliver more than its nominal power if the ambient temperature remains largely below the rated operating temperature.

The rated ambient temperature for Phaseo power supplies is 50 °C (+ 122 °F). Above this, derating is necessary up to a maximum temperature of 60 °C (+ 140 °F).

The graph below shows the power (in relation to the nominal power) which the power supply can deliver continuously, according to the ambient temperature.

P/Pn (%)

 

 

 

 

 

 

 

140

 

 

 

 

 

 

 

120

 

 

 

 

 

 

 

100

 

 

 

 

 

 

 

80

 

 

 

 

 

 

 

 

 

 

 

3

2

 

1

60

 

 

 

 

 

 

 

50

 

 

 

 

 

 

 

40

 

 

 

 

 

 

 

20

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

0

10

20

30

40

50

60

70

Maximum operating temperature (°C)

1 ABL 7RE, ABL 7RP, ABL 7U mounted vertically

2 ABL 7CEM mounted vertically

3 ABL 7CEM mounted horizontally

Derating should be considered in extreme operating conditions:

-intensive operation (output current permanently close to the nominal current, combined with a high ambient temperature),

-output voltage set above 24 V (to compensate for line voltage drops, for example),

-parallel connection to increase the total power.

General rules to be complied with

Intensive operation

See derating on above graph.

 

Example for ABL 7RE:

 

- without derating, from 0 °C to 50 °C (+ 32 to + 122 °F),

 

- derating of nominal current by 2 %, per additional °C, up to 60 °C (+ 140

 

°F).

 

 

Rise in output

The nominal power is fixed.

voltage

Increasing the output voltage means that the current delivered must be

 

reduced

Parallel connection

The total power is equal to the sum of the power supplies used, but the

to increase the

maximum ambient temperature for operation is 50 °C (+ 122 °F).

power (except

To improve heat dissipation, the power supplies must not be in contact

ABL 7CEM)

with each other

 

 

In all cases, there must be adequate convection round the products to ensure easier cooling. There must be a clear space of 50 mm (1.97") above and below Phaseo power supplies and of 15 mm (0.59") at the sides.

Presentation :

References :

Dimensions :

Schemes :

pages 58, 59

page 67

page 68

page 69

 

 

 

 

64

Courtesy of Steven Engineering, Inc. ● 230 Ryan Way, South San Francisco, CA 94080-6370 ● General Inquiries: (800) 670-4183 ● www.stevenengineering.com

Page 63 Page 65
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Quantum Instruments Splitter Boxes manual Derating, General rules to be complied with, ABL 7CEM
Page 63 Page 65

Splitter Boxes specifications

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