Datasheet

www.recom-power.com
REV.: 5/2018 I-2
DC/DC Converter
Specifications (refer to standard application circuit, Ta= 25°C)
R-7xxxP_D
Series
BASIC CHARACTERISTICS
Parameter Condition Min. Typ. Max.
Quiescent Current min. Vin to max.
30mA
Internal Power Dissipation ta<60°C
1.4W
Output Current Limit
R-72xxx
R-73xxx
R-74xxx
2.5A
3.75A
5.0A
3.0A
4.25A
5.5A
Minimum Load 10%
ON/OFF CTRL
(4)
DC-DC ON
DC-DC OFF
Open or high, 4.5V min. / 28V max.
Low (Power OFF) 0.8V max.
Input Current of CTRL Pin DC-DC OFF
100µA
Internal Operating Frequency
270kHz 300kHz 330kHz
Output Ripple and Noise
40mVp-p 70mVp-p
Maximum Capacitive Load
normal start-up time, no external diodes 200µF
<1 second start-up time + diode protection circuit 6800µF
continued on next page
How to calculate the max output current
Calculation 1: Calculation 2:
Calculation 3:
Notes:
Note4: ON/OFF pin driven by TTL (logic gate), open-collector bipolar transistor or open-drain MOSFET
0 0.5
0
20
40
60
80
85
100
Ambient Temperature [°C]
Internal Power Dissipation [W]
1.4
1
Vin = 28V
Vout = 5V
Eff
max Vin
= 91%
P
D
= 1.4W
T
Ambient
= 60°C
Vin = 28V
Vout = 5V
Eff
max Vin
= 91%
P
D
= 1.0W
T
Ambient
= 85°C
Vin = 12V
Eff
max Vin
= 94%
P
D
= 1.0W
T
Ambient
= 85°C
Example: R-745.0P
Iout=
1.4W
= 3.11A
5V x (1-0.91 )
Iout=
1W
= 2.222A
5V x (1-0.91 )
Iout=
1W
= 3.33A
5V x (1-0.94 )
Iout=
P
D
Vout x (1-Eff
max Vin
)
P
D
= Iout x Vout x (1-Eff
max Vin
)
The internal power dissipiation (P
D
) follows the equation: