samlex SDC-15 DC-DC Step-Down Converter Owner’s Manual

SDC-15 DC-DC Step-Down Converter
Owner’s Manual

WARNINGS!

• These units are not battery chargers! Hence, do not connect these units directly to a battery for battery charging purposes.
• These units are designed to be used on Negative Grounded Systems only. Do not connect the input/output sides to a Positive Grounded System.
• The input and output sides have a common Negative Ground. Hence, there is no isolation between the input and the output sides.

LAYOUT & DIMENSIONS

LEGEND FOR FIG 1

1. Input Terminal: +24 IN
2. Input Terminal: Negative / GND Terminal screw size:
3. Output Terminal: Negative / GND #6 x 32, 1 /4”
4.  Output Terminal: +13.8 OUT
5. Internal Input Fuse: SDC-15 : 10A, 250V | Bussman AGC-10 ; SDC-23 : 15A, 230V | Bussman AGC-15

DESCRIPTION

SDC-15 and SDC-23 are non-isolated DC to DC converters that convert 24 VDC nominal voltage (range 20 VDC to 35 VDC) to 12 VDC nominal voltage (13.8 VDC). The input and output sides have a common Negative Ground.
Hence, there is no isolation between the input and the output sides. Both the input and output sides are isolated from the chassis of the unit.

PROTECTIONS

Overload / Short Circuit
The units are protected against overload by current limiting. When the output current reaches the current limit value (please see the specs), the output voltage will drop and will no longer be regulated. The unit will reset automatically once the overload condition is removed.

Temperature Compensated Current Limit
As the temperature of the main switching MOSFET increases, the value of the current limit decreases.

Over Voltage on the Output Side
If the output voltage increases beyond 16.5 V +/-0.5 V, a crowbar circuit will activate and blow the internal input side fuse (5, Fig 1.1) / external input side fuse F1 (Fig 4.1) will blow.

Over Voltage / Transients on the Input Side
The input side is protected against over-voltage and transients through a Transient Voltage Suppressor. In case the input voltage exceeds 37 VDC, the internal input side fuse (5, Fig 1.1) / external input side fuse F1 (Fig 4.1) will blow.
Reversal of Polarity on the Input Side
In case the input side polarity is reversed, the internal input side fuse (5, Fig 1.1) / external input side fuse F1 F1 (Fig 4.1) will blow.

INSTALLATION & OPERATION

General Installation Requirements

• This unit is cooled by convection. Install the unit in a cool, dry & well-ventilated space. The ambient temperature should not exceed 40oC.
• Do not install the unit inside the engine compartment
• Do not connect/disconnect input and output connections when live voltages are present

Installation Diagram
Installation information is given at Fig 4.1 below:

Making Input & Output Connections & Operation
CAUTION!

1. Please ensure that the polarity of the input connection is not reversed. Connect the Positive of the battery to the Positive terminal and the Negative of the battery to the Negative. In case the input polarity is reversed, the internal input side fuse (5, Fig 1.1) / external input side fuse F1 (Fig 4.1) will blow.
2. Input and output connections should not be made when live voltages are present.
   – Switch off the load that is required to be powered from the converter
   – Connect the output wires to the load and then to the output side of the unit through the external fuse F2 (Fig 4.1). Observe correct polarity.
   – Remove the external input side fuse F1 (Fig 4.1) in the Positive input wire.
   – Connect the input side wires to the converter’s input side first. OBSERVE CORRECT POLARITY.
   – Connect the input wires to the battery.
   – Insert the external input side fuse F1 (Fig 4.1) in the Positive input wire.
   NOTE: A spark may be observed when inserting the fuse due to the initial inrush current to charge the input side capacitors inside the converter.
   – Output voltage will now be available on the output side of the unit.
   – Switch on the load.

SPECIFICATIONS

MODEL NO. SDC-15 SDC-23

CAUTION! There is no isolation between the input and the output sides.
Input and output have a common Negative.
OUTPUT
OUTPUT VOLTAGE| 13.8 VDC t 0.1V 0 12A| 13.8 VDC ± 0.1V 0 20A
CONTINUOUS OUTPUT CURRENT| 12A| 20A
PEAK OUTPUT CURRENT| 15A| 23A
CURRENT LIMIT| 16 ± 0.5A| 24 ± 0.5A
LOAD REGULATION| <1.5%| <1.5%
INPUT
INPUT VOLTAGE| 20 – 35 VDC| 20 – 35 VDC
INPUT CURRENT AT NO LOAD| < 150mA| < 150mA
LINE REGULATION| < 0.5%| < 0.5%
EFFICIENCY (At maximum output)| > 88%| > 88%
RIPPLE| < 10 mV P-P 0 12A| <50 mV P-P 0 20A
NOISE| < 40 mV P-P 0 12A| <120 mVP-P0 20A
FUSES
INTERNAL INPUT FUSE (inside the fuse holder)| 10A, 250V
(Bussmann AGC-10 or equivalent)| 15A, 250V
(Bussmann AGC-15 or equivalent)
EXTERNAL INPUT FUSE (At the battery end – Not supplied)| 10A, 32V
(Automotive blade type: ATO/ATC)| 15A, 32V
(Automotive blade type: ATO/ATC)
EXTERNAL OUTPUT FUSE
(not supplied)| 15A, 32V
(Automotive blade type: ATO/ATC)| 20A, 32V
(Automotive blade type: ATO/ATC)
PROTECTIONS
OUTPUT OVERLOAD / SHORT CIRCUIT| • Output current will be limited to 16 t 0.5A
• Output voltage will drop| • Output current will be limited to 24 t 0.5A
• Output voltage will drop
INPUT OVERVOLTAGE| Input side fuse(s) will blow at > 37 VDC| Input side fuse(s) will blow at > 37 VDC
OUTPUT OVER VOLTAGE| Input side fuse(s) will blow at > 16.5 t 0.5 VDC| Input side fuse(s) will blow at > 16.5 ± 0.5 VDC
REVERSE POLARITY ON INPUT SIDE| Input side fuse(s) will blow|
WIRES
INPUT WIRE SIZE| #12 AWG| #10 AWG
OUTPUT WIRE SIZE| #10 AWG| #8 AWG
ENVIRONMENT
OPERATING ENVIRONMENT| Indoor use| Indoor use
OPERATING TEMPERATURE RANGE| 0 – 40°C / 32 – 104°F| 0 – 40°C / 32 – 104°F
DIMENSIONS
(WXDXH),MM| 198 x 122 x 60| 198 x 122 x 60
(W X D X H), INCHES| 7.8 x 4.8 x 2.4| 7.8 x 4.8 x 2A
WEIGHT
KG| 0.9| 1.0
LBS| 2.0| 2.

NOTES:

1. All power ratings are specified for resistive load at Power Factor = 1.
2. All specifications given above are at an ambient temperature of 25°C / 77°F.
3. Specifications are subject to change without notice

WARRANTY

2 YEAR LIMITED WARRANTY
SDC-15 & SDC-23 are manufactured by Samlex America Inc. (the “Warrantor“) are warranted to be free from defects in workmanship and materials under normal use and service. The warranty period is 2 years for the United States and Canada and is in effect from the date of purchase by the user (the “Purchaser“).

Warranty outside of the United States and Canada is limited to 6 months. For a warranty claim, the Purchaser should contact the place of purchase to obtain a Return Authorization Number.

The defective part or unit should be returned at the Purchaser’s expense to the authorized location. A written statement describing the nature of the defect, the date of purchase, the place of purchase, and the Purchaser’s name, address, and telephone number should also be included.
If upon the Warrantor’s examination, the defect proves to be the result of defective material or workmanship, the equipment will be repaired or replaced at the

Warrantor’s option without charge and returned to the Purchaser at the Warrantor’s expense. (The contiguous US and Canada only)
No refund of the purchase price will be granted to the Purchaser unless the Warrantor is unable to remedy the defect after having a reasonable number of opportunities to do so. Warranty service shall be performed only by the Warrantor. Any attempt to remedy the defect by anyone other than the Warrantor shall render this warranty void. There shall be no warranty for defects or damages caused by faulty installation or hook-up, abuse or misuse of the equipment including exposure to excessive heat, salt or freshwater spray, or water immersion.

No other express warranty is hereby given and there are no warranties that extend beyond those described herein. This warranty is expressly in lieu of any other expressed or implied warranties, including any implied warranty of merchantability, fitness for the ordinary purposes for which such goods are used, or fitness for a particular purpose, or any other obligations on the part of the Warrantor or its employees and representatives.

There shall be no responsibility or liability whatsoever on the part of the Warrantor or its employees and representatives for injury to any persons, or damage to person or persons, or damage to property, or loss of income or profit, or any other consequential or resulting damage which may be claimed to have been incurred through the use or sale of the equipment, including any possible failure of malfunction of the equipment, or part thereof. The
Warrantor assumes no liability for incidental or consequential damages of any kind.

Samlex America Inc. (the “Warrantor”)
www.samlexamerica.com

Disclaimer of Liability
UNLESS SPECIFICALLY AGREED TO IN WRITING, SAMLEX AMERICA INC.:

1. MAKES NO WARRANTY AS TO THE ACCURACY, SUFFICIENCY OR SUITABILITY OF ANY TECHNICAL OR OTHER INFORMATION PROVIDED IN ITS MANUALS OR OTHER DOCUMENTATION.
2. ASSUMES NO RESPONSIBILITY OR LIABILITY FOR LOSSES, DAMAGES, COSTS OR EXPENSES, WHETHER SPECIAL, DIRECT, INDIRECT, CONSEQUENTIAL OR INCIDENTAL, WHICH MIGHT ARISE OUT OF THE USE OF SUCH INFORMATION. THE USE OF  ANY SUCH INFORMATION WILL BE ENTIRELY AT THE USERS RISK.

Samlex America reserves the right to revise this document and to periodically make changes to the content hereof without obligation or organization of such revisions or changes.

Copyright Notice/Notice of Copyright
Copyright © 2021 by Samlex America Inc. All rights reserved. Permission to copy, distribute and/or modify this document is prohibited without express written permission by Samlex America Inc.

103 – 4268 Lozells Ave.
Burnaby, BC
Canada V5A 0C6| T: 604 525 3836
F: 604 525 5221
TF: 1 800 561 5885
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www.samlexamerica.com
11001-SDC-15-23-1121

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SDC-15, SDC-23, SDC-15 DC-DC Step-Down Converter, DC-DC Step-Down Converter, Down Converter, Converter
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