PAH300
･
350S24
-SERIES
TDK-Lambda
10
+
+
+
-
Load
Load
+
-
+V
+S
-S
-V
TRM
+V
+S
-S
-V
TRM
Fig.12-2 Series Operation due to
±
Output
13. Operating ambient Temperature
There is no restriction on mounting direction but there
should be enough consideration for airflow so that heat
does not accumulate around the power module vicinity.
Determine external components configuration and
mounting direction on PCB such that air could flow
through the heatsink at forced cooling and conventional
cooling.
By maintaining actual baseplate temperature below
100
℃
, operation is possible.
For details on thermal design, refer to Application
Notes “Thermal Design”.
Note :
Maximum baseplate temperature is 100
℃
. For worst
case operating condition, verify baseplate temperature at
measurement point indicated in fig. 13-1.
Measurement Point
of Baseplate
Temperature
21mm
Input Side
Output Side
CL
Fig.13-1 Measurement Point of
Baseplate Temperature
For better improvement of power module reliability,
derating of baseplate temperature when using is
recommended.
14. Operating Ambient Humidity
Take note that moisture could lead to power module
abnormal operation or damage.
15. Storage Ambient Temperature
Abrupt temperature change would cause moisture
formation that leads to poor solderabilty of each
terminal of the power module.
16. Storage Ambient Humidity
Take enough care when storing the power module
because rust which causes poor solderability would form
in each terminal when stored in high temperature, high
humidity environment.
17. Cooling Method
Operating temperature range is specified by the
baseplate temperature. Therefore, several methods of
heat dissipation are possible.
For details on thermal design, refer to Application Notes
“Thermal Design”.
18. Baseplate Temperature vs. Output
Voltage Drift
Output voltage drift is defined as the rate of voltage
change when baseplate temperature only is changed during
operation.
19. Withstand Voltage
This power module is designed to have a withstand
voltage of 1.5kVDC between input and baseplate,
1.5kVDC between input and output and 500VDC
between output and baseplate for 1 minute. When
conducting withstand voltage test during incoming
inspection, be sure to apply DC voltage. Also, set the
current limit value of the withstand voltage testing
equipment to 10mA.
Be sure to avoid conducting test with AC voltage
because this would cause power module damage.
Furthermore, avoid throw in or shut off of the testing
equipment when applying or when shutting down the
test voltage. Instead, gradually increase or decrease the
applied voltage. Take note especially not to use the
timer of the test equipment because when the timer
switches the applied voltage off, impulse voltage which
has several times the magnitude of the applied voltage
is generated causing damage to the power module.
Connect the terminals as shown in the diagram below.
