Puls CD5.121 DC/DC Converter Specification Guide
CD5.121
CD-Series
DC/DC Converter 12V, 8A
6. H
OLD
-
UP
T
IME
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.
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
0
2
4
6
8
12ms
18
20
22
24
28Vdc
Input Voltage
Hold-up Time
(a) 12V, 4A, typ.
(b) 12V, 4A, min.
(c) 12V, 8A, typ.
(d) 12V, 8A, min.
(b) 12V, 4A, min.
(c) 12V, 8A, typ.
(d) 12V, 8A, min.
10
26
(a)
(b)
(c)
(d)
Fig. 6-2 Shut-down test setup
Fig. 6-3 Shut-down behavior, definitions
Load
+
-
DC/DC
Converter
DC
Source
+
-
Input
Output
+
-
CD5
S1
- 5%
Hold-up Time
Output
Voltage
Voltage
Intput
Voltage
Voltage
S1 opens
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.
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.
www.pulspower.com Phone +49 89 9278 0 Germany
7/21