Data Sheet
Table Of Contents
- 1. Intended Use
- 2. Installation Requirements
- 3. Input Voltage
- 4. Soft-start and Input Inrush Current Surge
- 5. Output
- 6. Hold-up Time
- 7. Efficiency and Power Losses
- 8. Functional Diagram
- 9. Front Side and User Elements
- 10. Terminals and Wiring
- 11. Reliability
- 12. EMC
- 13. Environment
- 14. Protection Features
- 15. Safety Features
- 16. Dielectric Strength
- 17. Approvals
- 18. RoHS, REACH and Other Fulfilled Standards
- 19. Physical Dimensions and Weight
- 20. Accessories
- 21. Application Notes
- 21.1. Peak Current Capability
- 21.2. Back-feeding Loads
- 21.3. Inductive and Capacitive Loads
- 21.4. External Input Protection
- 21.5. Requirements for the Supplying Source
- 21.6. Parallel Use to Increase Output Power
- 21.7. Parallel Use for Redundancy
- 21.8. Series Operation
- 21.9. Charging of Batteries
- 21.10. Use in a Tightly Sealed Enclosure
- 21.11. Mounting Orientations
CD5.241-L1
CD-Series
DC/DC Converter 24V, 3.8A
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. 13.8ms input 24Vdc, output: 24Vdc, 1.9A, see Fig. 6-1
typ. 7ms input 24Vdc, output: 24Vdc, 3.8A, 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) 24V, 1.9A, typ.
(b) 24V, 1.9A, min.
(c) 24V, 3.8A, typ.
(d) 24V, 3.8A, min.
10
26
(
a
)
(
b
)
(
c
)
(
d
)
Fig. 6-2 Shut-down test setup Fig. 6-3 Shut-down behavior, definitions
7/21
Load
+
-
DC/DC
Converter
DC
Source
+
-
Input
Output
+
-
CD5
S1
- 5%
Hold-up Time
Output
Voltage
Intput
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.
Mar. 2016 / Rev. 1.2 DS-CD5.241-L1-EN
All parameters are specified at 24V, 3.8A, 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