CD5.243 Datasheet, PDF (7/22 Pages) PULS GmbH – DC/DC Converter

CD-Series
CD5.243
DC/DC Converter 24V, 4A
Peak current capability (up to several milliseconds)
The DC/DC converter can deliver a peak current, which is higher than the specified short term current. This helps to
start current demanding loads or to safely operate subsequent circuit breakers.
The extra current is supplied by the output capacitors inside the DC/DC converter. During this event, the capacitors will
be discharged and causes a voltage dip on the output. Detailed curves can be found in chapter 21.1.
Peak current voltage dips
typ. from 24V to 18V at 8A for 50ms, resistive load
typ. from 24V to 12.5V at 16A for 2ms, resistive load
typ. from 24V to 10V at 16A for 5ms, resistive load
6. HOLD-UP TIME
The input side of the DC/DC converter is equipped with a bulk capacitor which keeps the output voltage alive for a
certain period of time when the input voltage dips or is removed. The bulk capacitor can be discharged by loading the
DC/DC converter on the output side or through a load which is parallel to the input. There is no protection in the
DC/DC converter which prevents current from flowing back to the input terminals. If prevention is needed, an external
diode should be used.
Hold-up Time
typ.
5.8ms
input 12Vdc, output: 24Vdc, 2A, see Fig. 6-1
typ.
3.0ms
input 12Vdc, output: 24Vdc, 4A, see Fig. 6-1
Fig. 6-1 Hold-up time vs. input voltage
Hold-up Time
6ms
5
(a) _(b)
4
3
(c) _(d)
2
1
0
9
Input Voltage
(a) 24V, 2A, typ.
(b) 24V, 2A, min.
(c) 24V, 4A, typ.
(d) 24V, 4A, min.
10
11 12 13 14Vdc
Fig. 6-2 Shut-down test setup
S1
+
DC
Source
-
DC/DC
Converter
Input ₊
CD5
Output ^-
+
Load
-
Fig. 6-3 Shut-down behavior, definitions
Intput
Voltage
S1 opens
Output
Voltage
Hold-up Time
- 10%
Note: At no load, the hold-up time can be up to several seconds. The green DC-ok lamp is also on during this time.
Mar. 2016 / Rev. 1.3 DS-CD5.243-EN
All parameters are specified at 24V, 4A, 12Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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