Datasheet

www.recom-power.com
REV.: 3/2019 I-2
DC/DC Converter
Specifications (measured at Ta= 25°C, minimum load, otherwise specified)
R-78C-1.0
Series
PROTECTIONS
Parameter Condition Value
Short Circuit Protection (SCP) continuous, automatic recovery
Short Circuit Input Current nom. Vin = 24VDC 65mA typ.
ENVIRONMENTAL
Parameter Condition
Value
Operating Temperature Range with derating (see graph) -40°C to +85°C
Max. Case Temperature +100°C
Temperature Coefficient 0.015%/°C
Case Thermal Impedance 70°C/W max.
Operating Altitude 2000m
Operating Humidity non condensing 5% - 95% max., RH
Pollution Degree PD2
MTBF MIL-HDBK 217F
+25°C
+68°C
8600 x 10
3
hours
3880 x 10³ hours
-40 -20 0 20 40 70
68 85
60-30 -10 10 30 50 80 90 100
100
80
60
40
90
70
50
30
20
10
0
Output Load [%]
Ambient Temperature [°C]
Derating Graph
External Zener Diode Calculation for Output Over Voltage Protection
+V
IN
+V
OUT
R-78Cxx-1.0
R-78C Vout Zener Voltage, Vz (Vzmin) Recommended Zener Diode
1.8V (1.85V max.) 2.0V (1.90V) MMSZ679T1G
3.3V (3.4V max.) 3.6V (3.42V) MMSZ4685T1G
5V (5.15V max.) 5.6V (5.32V) MMSZ4690T1G
9V (9.27V max.) 10V (9.50V) MMSZ4697T1G
12V (12.36V max.) 13V (12.35V) 14V (13.30V) MMSZ4700T1G / MMSZ4701T1G
15V (15.45V max.) 17V (16.15V) MMSZ4704T1G
Minimum Zener Breakdown Voltage (VZmin) ≥ VOUTnom + 3% Accuracy
SAFETY AND CERTIFICATIONS
Certificate Type (Safety) Report / File Number Standard
Information Technology Equipment, General Requirements for Safety 1603123
IEC60950-1:2005, 2nd Edition + AM 2:2013
EN60950-1:2006 + AM2:2013
RoHS 2+ RoHS 2011/65/EU + AM2015/863
EAC RU-AT.49.09571 TP TC 004/2011
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