Datasheet
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. Charging of Batteries
- 21.5. External Input Protection
- 21.6. Requirements for the Supplying Source
- Parallel Use to Increase Output Power
- 21.8. Parallel Use for Redundancy
- 21.9. Daisy Chaining of Outputs
- Series Operation
- 21.11. Use in a Tightly Sealed Enclosure
- 21.12. Mounting Orientations
CD5.121
CD-Series
DC/DC Converter 12V, 8A
21.4. CHARGING OF BATTERIES
The DC/DC converter can be used to charge lead-acid or maintenance free 12V VRLA batteries.
Instructions for charging batteries:
a) Ensure that the ambient temperature of the DC/DC converter is below 45°C
b) Do not use DC/DC converters in mounting orientations other than the standard mounting orientation (input
terminals on the bottom and output terminals on top of the unit).
c) Set output voltage (measured at no load and at the battery end of the cable) very precisely to the end-of-charge
voltage.
End-of-charge voltage 13.9V 13.75V 13.6V 13.4V
Battery temperature 10°C 20°C 30°C 40°C
d) Use a 10A circuit breaker (or blocking diode) between the DC/DC converter and the battery.
e) Ensure that the output current of the DC/DC converter is below the allowed charging current of the battery.
f) The return current to the DC/DC converter (battery discharge current) is typ. 15mA when the DC/DC converter is
switched off (except in case a blocking diode is utilized).
21.5. EXTERNAL INPUT PROTECTION
The unit is tested and approved for branch circuits up to 50A. An external protection is only required, if the supplying
branch has an ampacity greater than this. Check also local codes and local requirements. In some countries local
regulations might apply.
If an external fuse is necessary or utilized, minimum requirements need to be considered to avoid nuisance tripping of
the circuit breaker. A minimum value of 10A B- or 8A C-Characteristic breaker should be used.
21.6. REQUIREMENTS FOR THE SUPPLYING SOURCE
In certain circumstances, the input filter of the DC/DC converter can show a resonant effect which is caused by the
supplying network. Especially when additional external input filters are utilized, a superimposed AC voltage can be
generated on the input terminals of the DC/DC converter which might cause a malfunction of the unit. Therefore,
additional input filters are not recommended. To avoid the resonant effects, the minimal resistance of the supplying
network which depends on the inductance of the input network, shall be above the boundary curve in Fig. 21-3.
Fig. 21-3 External input filter requirements to
avoid filter instabilities
1 mOhm
10 mOhm
100 mOhm
1 Ohm
0.1mH 1mH 10mH
Inductance of the supplying network
Resistance of the
supplying network
(a) max.
(b) typ.
(
a
)
(
b
)
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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