Puls CD5.121 DC/DC Converter Specification Guide
CD5.121
CD-Series
DC/DC Converter 12V, 8A
22. A
PPLICATION
N
OTES
22.1. P
EAK
C
URRENT
C
APABILITY
Solenoids, contactors and pneumatic modules often have a steady state coil and a pick-up coil. The inrush current
demand of the pick-up coil is several times higher than the steady-state current and usually exceeds the nominal
output current (including the PowerBoost) The same situation applies, when starting a capacitive load.
demand of the pick-up coil is several times higher than the steady-state current and usually exceeds the nominal
output current (including the PowerBoost) The same situation applies, when starting a capacitive load.
Branch circuits are often protected with circuit breakers or fuses. In case of a short or an overload in the branch circuit,
the fuse needs a certain amount of over-current to trip or to blow. The peak current capability ensures the safe
operation of subsequent circuit breakers.
the fuse needs a certain amount of over-current to trip or to blow. The peak current capability ensures the safe
operation of subsequent circuit breakers.
Assuming the input voltage is turned on before such an event, the built-in large sized output capacitors inside the
DC/DC converter can deliver extra current. Discharging this capacitor causes a voltage dip on the output. The following
two examples show typical voltage dips:
DC/DC converter can deliver extra current. Discharging this capacitor causes a voltage dip on the output. The following
two examples show typical voltage dips:
Fig. 22-1 Peak loading with 2x the nominal
current for 50ms, typ.
Fig. 22-2 Peak loading with 5x the nominal
current for 5ms, typ.
10ms/DIV
Output
Voltage
Voltage
Output
Current
Current
12V
1A
16A
8.3V
1ms/DIV
Output
Voltage
Voltage
Output
Current
Current
12V
1A
40A
4.3V
Peak load 16A (resistive load) for 50ms
Output voltage dips from 12V to 8.3V.
Output voltage dips from 12V to 8.3V.
Peak load 40A (resistive load) for 5ms
Output voltage dips from 12V to 4.3V.
Output voltage dips from 12V to 4.3V.
22.2. B
ACK
-
FEEDING
L
OADS
Loads such as decelerating motors and inductors can feed voltage back to the DC/DC converter. This feature is also
called return voltage immunity or resistance against Back- E.M.F. (Electro Magnetic Force).
called return voltage immunity or resistance against Back- E.M.F. (Electro Magnetic Force).
This DC/DC converter is resistant and does not show malfunctioning when a load feeds back voltage to the DC/DC
converter. It does not matter, whether the DC/DC converter is on or off.
converter. It does not matter, whether the DC/DC converter is on or off.
The maximum allowed feed-back-voltage is 16Vdc. The absorbing energy can be calculated according to the built-in
large sized output capacitance which is specified in chapter 5.
large sized output capacitance which is specified in chapter 5.
22.3. I
NDUCTIVE AND
C
APACITIVE
L
OADS
The unit is designed to supply any kind of loads, including unlimited capacitive and inductive loads.
Oct 2009 / Rev. 1.3 DS-CD5.121-EN
All parameters are specified at 12V, 8A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
All parameters are specified at 12V, 8A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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