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Power supplies for d.c. control circuits
Phaseo
®
regulated switch mode power supplies
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.
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.
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.
Derating
0
0
10 20 30 40 50 60
70
20
40
50
60
80
100
120
140
123
Maximum operating temperature (°C)
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
voltage
The nominal power is fixed.
Increasing the output voltage means that the current delivered must be
reduced
Parallel connection
to increase the
power (except
ABL 7CEM)
The total power is equal to the sum of the power supplies used, but the
maximum ambient temperature for operation is 50 °C (+ 122 °F).
To improve heat dissipation, the power supplies must not be in contact
with each other
Presentation :
pages
58, 59
References :
page
67
Dimensions :
page 68
Schemes :
page
69
P/Pn (%)
Courtesy of Steven Engineering, Inc. ● 230 Ryan Way, South San Francisco, CA 94080-6370 ● General Inquiries: (800) 670-4183 ● www.stevenengineering.com