Datasheet

www.recom-power.com
REV.: 0/2019 P-2
Reference Design
Specifi cations (measured @ Ta= 25°C, full load after warm up unless otherwise stated)
R-REF04-RIA12
1. Fit the appropriate DC/DC converter (mounting holes are provided for fi xing screws) on to the board. Carefully solder the pins, checking
that the solder connections are clean and there are no dry joints
2. If required, mount a suitable cooling fan (supply voltage = DC/DC output voltage) and connect to the fan supply connector, CON6
3. If necessary, connect an external hold-up capacitor using CON4
The required total hold-up capacitance can be calculated from the following relationship:
Examples:
1: For a 10ms hold-up time for RPA120-11024SW (120W, 110VDC input, 24VDC output) R-REF04-RIA12-1 is used:
No external hold-up capacitor is required (450µF is on-board)
2: For a 30ms hold-up time for RP180-2415SW (144W, 24VDC input, 15VDC output) R-REF04-RIA12-2 is used:
A 18000µF external hold-up capacitor bank is required (1410µF is on-board)
4. Connect the supply voltage to CON1 and, if necessary, enable the device via CON5 (/N versions are normally on if EN is left fl oating)
Quick Start Guide
C
hold-up
= total hold-up capacitance [µF]
P
out
= output power [W]
t
hold-up
= required hold-up time [ms]
η
full load
= effi ciency of converter (from datasheet) [%]
V
in nom.
= nom. input voltage [V]
V
in min.
= min. operating input voltage [V]
of converter (from datasheet)
P
out
= 120W
t
hold-up
= 10ms
η
full load
= 88.5%
V
in nom.
= 110V
V
in min.
= 53V
P
out
= 144W
t
hold-up
= 30ms
η
full load
= 90%
V
in nom.
= 24V
V
in min.
= 9V
C
hold-up
=
200 x P
out x
t
hold-up
1000 x η
full load
x ( V
in nom.
2
- V
in min.
2
)
C
hold-up
=
200 x 120 x 10
1000 x 88.5 x ( 110
.
2
-53
.
2
)
C
hold-up
=
200 x 144 x 30
1000 x 90 x ( 24
.
2
-9
.
2
)
C
hold-up
=
292µF
C
hold-up
=
19400µF