PYD20 Manual
DC-DC Converter Isolated, 20W, 2x1”, PCB Mount
All parameters are typical values specified at nominal input voltage, nominal output load, 25°C ambient and after a 5 minutes run-in time unless
otherwise noted. The information presented in this document is believed to be accurate and reliable and may change without notice.
For additional information, please visit
https://product.tdk.com/en/power/py
.
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DOC-ID: 260921 – Issue 1
16. T
HERMAL
C
ONSIDERATION AND
D
ERATING
The DC-DC converters operate over a wide temperature range. Even if the heat generated by the DC-DC
converters are very low, it must be removed. This can be done either by
convection cooling, forced air cooling or radiation.
It is important that the enclosure temperature at the indicated temperature
reference point does not exceed the maximum enclosure temperature, which
is 105°C.
If the DC-DC converter is used in vertical mounting position with natural
convection cooling without airflow obstruction, the following output loads can be powered depending on the
ambient (air) temperature.
Allowed Output Load
0
-40
105°C
100%
Ambient (Air) Temperature
20%
40%
60%
80%
80
77
67
+55
1...For 5V output
2...For ±24V output
3...For all remaining models
2
3
1
The derating is not hardware controlled. The user has to take this into consideration to stay below the de-
rated current limits in order not to overload the unit.
17. EMC
C
ONSIDERATIONS
In terms of EMC, this DC-DC converter module is considered a component for installation in an end device by
a device manufacturer. In order to meet all the requirements of the end device, additional components may
have to be deployed and final EMC measurements must be carried out in the end application.
The following tests and measurements were performed according to EN 55032 and EN 50121-3-2 (emission)
and EN 55024 and EN 50121-3-2 (immunity).
All tests and measurements were carried out with standardized test set-ups.
EMC Immunity
Electrostatic discharge
EN 61000-4-2
Air discharge
Contact discharge
±
8kV
±
6kV
Criterion A
Criterion A
Electromagnetic RF field
EN 61000-4-3
80MHz-1GHz
20V/m
Criterion A
Fast transients (Burst)
EN 61000-4-4
Input, with additional
components see note 1)
±
2kV
Criterion A
Surge voltage
EN 61000-4-5
Input, with additional
components see note 1)
±
2kV
Criterion A
Conducted disturbance
EN 61000-4-6
0.15-80MHz
10V
Criterion A
Performance criterion A:
The device shows normal operation behavior within the defined limits.
Note 1)
Burst and surge tests were performed with an additional 100µF/200V capacitor and 180V suppressor diode
SMCJ180A.
2''
1''
Top View
Temperature
reference
point
