CD5.121 Datasheet, PDF (7/22 Pages) PULS GmbH – DC/DC Converter 12V, 8A

CD-Series
CD5.121
DC/DC Converter 12V, 8A
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.
12.8ms
input 24Vdc, output: 12Vdc, 4A, see Fig. 6-1
typ.
7ms
input 24Vdc, output: 12Vdc, 8A, see Fig. 6-1
Fig. 6-1 Hold-up time vs. input voltage
Hold-up Time
12ms
10
(a)
(b)
8
(c)
(d)
6
4
2
0
18
Input Voltage
(a) 12V, 4A, typ.
(b) 12V, 4A, min.
(c) 12V, 8A, typ.
(d) 12V, 8A, min.
20
22 24 26 28Vdc
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
- 5%
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. 1.5 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.
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