TDK-Lambda PAH300 Series, Instruction Manual

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PAH300
･
350S24 -SERIES
TDK-Lambda
14
■
Before concluding power module damage
Verify following items before concluding power
module damage.
1) No output voltage
・ Is specified input voltage applied?
・ Are the ON/OFF control terminal (CNT), remote
sensing terminal (+S, -S), output voltage trimming
terminal (TRM) correctly connected?
・ For cases where output voltage adjustment is used, is
the resistor or variable resistor setting, connections
correctly done?
・ Are there no abnormalities in the output load used?
・ Is the baseplate temperature within the specified
temperature range?
2) Output voltage is high
・
Are the remote sensing terminals (+S, -S) correctly
connected?
・ Is the measurement done at the sensing points?
・
For cases where output voltage adjustment is used, is
the resistor or volume setting, connections correctly
done?
3) Output voltage is low
・ Is specified input voltage applied?
・ Are the remote sensing terminals (+S, -S) correctly
connected?
・ Is the measurement done at the sensing points?
・ For cases where output voltage adjustment is used, is
the resistor or variable resistor setting, connections
correctly done?
・ Are there no abnormalities in the output load used?
4) Load regulation and line regulation is large
・ Is specified input voltage applied?
・
Are the input terminals and the output terminals
firmly connected?
・ Is the measurement done at the sensing points?
・
Is the input or output wire too thin?
5) Output ripple voltage is large
・
Is the measuring method used the same or equivalent
with the specified method in the Application Notes?
・ Is the input ripple voltage value within the specified
value?