Data Sheet

www.recom-power.com
REV.: 5/2019 I-4
DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
R-78AA-0.5
Series
PROTECTIONS
Parameter Condition Value
Short Circuit Protection (SCP) continuous, automatic recovery
Short Circuit Input Current nom. Vin= 24VDC 60mA typ. / 100mA max.
Optional Diode Protection Circuit
+V
in
+V
out
+V
out
Output Voltage Adjustability
up 1 diode drop
GNDGND
R-78AAxx
-0.5SMD
R-78AAxx
-0.5SMD
CTRL
+V
in
+V
out
GND V
adj
CTRL
+V
in
+V
out
GNDCTRL
CTRL
+V
in
GNDGND
+V
in
+V
out
+V
out
Output Voltage Adjustability
up 1 diode drop
GNDGND
R-78AAxx
-0.5SMD
R-78AAxx
-0.5SMD
CTRL
+V
in
+V
out
GND V
adj
CTRL
+V
in
+V
out
GNDCTRL
CTRL
+V
in
GNDGND
Add a blocking diode to Vout if
current can flow backwards into
the output, as this can damage the
converter when it is powered down.
The diode can either be fitted
across the device if the source is
low impedance or fitted in series
with the output (recommended).
Optional Protection 1: Optional Protection 2:
ENVIRONMENTAL
Parameter Condition
Value
Operating Temperature Range with derating (see graph) -40°C to +85°C
Maximum Case Temperature +100°C
Temperature Coefficient ±0.015%/°C
Thermal Impedance 0.1m/s, horizontal 70°C/W
Operating Altitude 2000m
Operating Humidity non-condensing 5% - 95% RH max.
Pollution Degree PD2
MTBF according to MIL-HDBK-217F, G.B.
+25°C
+ 71°C
21098 - 29253 x 10
3
hours
4214 - 7365 x 10
3
hours
Derating Graph
-40 -20 0 20 40 70
71 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]
REGULATIONS
Parameter Condition Value
Output Accuracy full load ±2.0% typ. / ±3.0% max.
Line Regulation
low line to high line
at full load
1.5 VDC tp 6.5VDC
9VDC to 15VDC
±0.2% typ. / ±0.4% max.
±0.1% typ. / ±0.2% max.
Load Regulation 10% to 100% load
1.5 VDC tp 6.5VDC
9VDC to 15VDC
±0.7% typ. / ±1.0% max.
±0.25% typ. / ±0.4% max.
Transient Response
with a 100µF output
capacitor
100% <-> 50% load
100% <-> 10% load
±85mV typ. / ±100mV max.
±100mV typ.