LS4301-7R POWER-ONE [Power-One], LS4301-7R Datasheet - Page 9

• Manufacturer Part Number: LS4301-7R
• Description: 100 Watt AC-DC Converters with PFC
• Manufacturer: POWER-ONE [Power-One]

Cassette Style
Edition 01/01.2001
Thermal Considerations
If a converter is located in free, quasi-stationary air (con-
vection cooling) at the indicated maximum ambient tem-
perature T
is operated at its nominal input voltage and output power,
the temperature measured at the Measuring point of case
temperature T
indicated value T
the relationship between T
conditions of operation and integration into a system. The
thermal conditions are influenced by input voltage, output
current, airflow and temperature of surrounding compo-
nents and surfaces. T
an indicative value only.
Notes: Sufficient forced cooling or an additional heat sink
allows T
exceeded.
For -7 or -9 units at an ambient temperature T
only convection cooling, the maximum permissible current
for each output is approx. 40% of its nominal value as per
figure.
Fig. 8
Output current derating versus temperature for -7 and -9
units.
Thermal Protection
A temperature sensor generates an internal inhibit signal
which disables the outputs if the case temperature exceeds
T
perature drops below this limit.
It is recommended that continuous operation under simul-
taneous extreme worst case conditions of the following
three parameters be avoided: Minimum input voltage,
maximum output power and maximum temperature.
Output Protection
Each output is protected against overvoltage which could
occur due to a failure of the control circuit by means of a
voltage suppressor diode which, under worst case condi-
tions, may become a short circuit. The suppressor diodes
are not designed to withstand externally applied over-
voltages. Overload at any of the two outputs will cause a
shut-down of both outputs. A red LED indicates the over-
load condition.
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
C max
Caution: The installer must ensure that under all operat-
ing conditions T
table: Temperature specifications.
0
I
o
T
/I
A min
o nom
. The outputs are automatically re-enabled if the tem-
A
to be higher than 71 C (e.g. 85 C) if T
A max
50
Convection cooling
C
(see table: Temperature specifications) and
(see: Mechanical Data ) will approach the
C max
C
remains within the limits stated in the
60
A max
after the warm-up phase. However,
A
70
Forced cooling
is therefore, contrary to T
and T
C
80
depends heavily on the
90
100 Watt AC-DC Converters
A
of 85 C with
100
C max
T
C max
T
A
C max
is not
[ C]
,
Parallel or Series Connection of Units
Single or double output units with equal nominal output volt-
age can be connected in parallel without any precautions
using option T.
With option T (current sharing), all units share the current
approximately equally.
Single output units and/or main and second outputs of dou-
ble output units can be connected in series with any other
(similar) output.
Note:
– Parallel connection of double output units should always
– Not more than 5 units should be connected in parallel.
– Series connection of second outputs without involving
– The maximum output current is limited by the output with
Output Voltage Regulation of Single or Double Output
Modules with Outputs 1 and 2 Connected in Series
Fig. 9
U
Output Voltage Regulation of Double Output Modules
Output 1 is under normal conditions regulated to U
independent of the output currents.
U
are loaded with more than 10% of I
U
figures show the regulation with varying load distribution. If
I
viation of U
vided that a total load of more than 10% of I
Two outputs of a single S 5000 module connected in paral-
lel will behave like the output of a S 4000 module; the paral-
leled output is fully regulated. No precautions are neces-
sary in using the R-input and the test sockets.
o1
o1
o2
o2
include both, main and second output to maintain good
regulation of both outputs.
their main outputs should be avoided as regulation may
be poor.
the lowest current limitation if several outputs are con-
nected in series.
= I
0.98
vs. I
is dependent upon the load distribution. If both outputs
remains within 5% of the value of U
0.5
o2
U
0
o nom
U
or the two outputs are connected in series, the de-
o1
o
(typ.) of single output units
o2
remains within 1% of the value of U
0.5
o nom
1.0
o1
, the deviation of
. The following 3
S Series PFC
o nom
I
I
o1
oL
is applied.
I
o nom
05001
o1
I
o1 nom
o
9/27
pro-
,