DC/DC CONVERTER 24V DC-Input Isolated 12Vdc Output Efficiency up to 88.2% Width only 32mm 20% Output Power Reserves Full Power Between -25°C and +60°C Soft-start Function Included Minimal Inrush Current Surge Reverse Input Polarity Protection 3 Year Warranty GENERAL DESCRIPTION SHORT-FORM DATA The Dimension CD-Series offer DIN-rail DC/DC converters in the 92-120W output power range in a very compact housing. These DC/DC converters are allowed to run with a battery or similar sources. Output voltage Adjustment range Output current The CD5.121 converts a 24V voltage to a 12V voltage. The CD5.121 includes all the essential basic functions and has a power reserve of 20% included. This extra power can be used continuously up to +45°C. The output is electrically isolated from the input in a safe way. The input is protected against reversed voltages and contains a soft start function. 24V->24V, NEC Class 2, CD5.241-L1 Spring-clamp-terminals, 24V->24V, CD5.241-S1 Spring-clamp-terminals, Input-low, DC-OK signals ORDER NUMBERS DC 12V 12 - 15V 8 – 6.4A 9.6 – 7.7A Output power 96W 115W Output ripple < 75mVpp Input voltage DC 24V Input voltage range 18 to 32.4Vdc 14,4 to 18Vdc Input current typ. 4.6A Input inrush current typ. 1.2A peak Efficiency 88.2% Losses 12.8W Temperature range -25°C to +70°C Derating 2.5W/°C Hold-up time typ. 7ms Dimensions 32x124x102mm ambient <60°C ambient <45°C ambient <60°C ambient <45°C 20Hz to 20MHz full specified with derating at 24Vdc input at 24Vdc input at 24Vdc input operational +60 to +70°C at 24Vdc input WxHxD DC/DC Converter Standard unit Wall mount bracket Side mount bracket Jan. 2014 / Rev. 1.4 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. www.pulspower.com Phone +49 89 9278 0

The information presented in this document is believed to be accurate and reliable and may change without notice. Some parts of this unit are patent by PULS (US patent No 091662,063, Des. 424,529, …). No part of this document may be reproduced or utilized in any form without permission in writing from PULS GmbH. PE is the abbreviation for Protective Earth and has the same meaning as the symbol Earth, Ground This document uses the term “earth” which is the same as the U.S. term “ground”. To be defined, value or description will follow later. A figure displayed with the AC or DC before the value...

1. INTENDED USE This device is designed for installation in an enclosure and is intended for the general use such as in industrial control, office, communication, and instrumentation equipment. Do not use this DC/DC converter in equipment where malfunction may cause severe personal injury or threaten human life. This device is designed for use in hazardous, non-hazardous, ordinary or unclassified locations. 2. INSTALLATION REQUIREMENTS This device may only be installed and put into operation by qualified personnel. This device does not contain serviceable parts. The tripping of an internal fuse...

3. INPUT VOLTAGE Input voltage Input voltage range max. Allowed voltage between input and earth Turn-on voltage Shut-down voltage Input current Start-up delay Rise time Turn-on overshoot Input capacitance Allowed input ripple voltage full specified maximal 60 seconds or with de-rating see Fig. 3-2 absolute maximum continuous input voltage with no damage to the DC/DC converter in case the output voltage is not grounded. 47Hz-40kHz, the momentary input voltage must always be within the specified limits. steady-state value, see Fig. 3-1 steady-state value, see Fig. 3-1 steady-state value, see Fig....

□IfUiefDSIOfl) CD-Series I 4. SOFT-START AND INPUT INRUSH CURRENT SURGE Inrush current limitation An active inrush limitation circuit (inrush limiting resistor which is bypassed by a relay contact) limits the input inrush current after turn-on of the input voltage. The charging current into EMI suppression capacitors is disregarded in the first microseconds after switch-on. Inrush current Inrush energy Fig. 4-1 Input inrush current, typical behavior Input Voltage Output: 12V, 8A, constant current load Upper curve: Input current 2A/DIV Middle curve: Input voltage 20V/DIV Lower curve: Output voltage...

□IfUiefDSIOfl) CD-Series Output voltage Adjustment range Factory setting Line regulation Load regulation Ripple and noise voltage Output current Output power Short-circuit current Output capacitance at clockwise end position of potentiometer ±0.2%, at full load, cold unit_ Input voltage variations between 18 to 32.4Vdc continuous current, short circuit impedance 150mOhm continuous current, short circuit impedance 150mOhm Fig. 5-1 Output voltage vs. output current at Output Voltage Fig. 5-2 Current limitation vs. input voltage, (11.5V constant voltage load), typ. Output Current ' ' Input Voltage...

□innefUSIOfU CD-Series DC/DC Converter 12V, 8A 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....

□IfUiefDSIOfl) CD-Series I 7. EFFICIENCY AND POWER LOSSES Power losses Fig. 7-1 Efficiency vs. output current at 12V output and 24Vdc input voltage, typ. Fig. 7-2 Losses vs. output current at 12V output and 24Vdc input voltage, typ. Power Losses Fig. 7-3 Efficiency vs. input voltage at 12V, Fig. 7-4 Losses vs. input voltage at 12V, 8A, Power Losses Input Voltage All parameters are specified at 12V, 8A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted. 8/22