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
20. H
OLD
-
UP
T
IME
C
IRCUITRY
The hold time is defined as the time period during which the DC-DC converter output remains active after a
loss of input power. The DC-DC converter itself is not capable of providing a hold time. For this, an external
circuit with a large hold-up (storage capacitor) is required. The lower the operating voltage of the system, the
larger this hold-up capacitor must be.
D1, D2:
200V/10A
.
17/17
DOC-ID: 260921 – Issue 1
ed.
age
TRIM 4
- Vout 5
+ Vout 3
Load
PYD
6 RC
2 -Vin
1 +Vin
+
D1
C1
R1
D2
+Vin
-Vin
D2:
To prevent the stored energy from flowing in
the wrong direction and not being available for the
DC-DC converter. Use only if need
R1:
100
Ω
, 10W
C1:
see table below, voltage must be larger than
the supply volt
Sizing the hold-up capacitor
Input
Voltage 24Vdc 36Vdc 48Vdc 72Vdc 96Vdc 110Vdc
Hold-up capacitor
(C1) for 10ms
1100µF
460µF 250µF 110µF 68µF 50µF
Hold-up capacitor
(C1) for 30ms
3300µF 1400µF 750µF 330µF 200µF 150µF
21. C
LEANING
P
ROCESS AND
S
OLDERING
P
ROFILE
Cleaning process
Clean the soldered side of the module with a brush, prevent liquid from getting into the module. Do not clean
by soaking the module into liquid. Do not allow solvent to come in contact with product labels or resin case
as this may changed the color of the resin case or cause deletion of the letters printed on the product label.
After cleaning, dry the modules well.
Hand soldering
The suggested soldering iron is 420±10°C for up to 4~15seconds (less than 90W).
Lead free wave soldering
