INNOLINE
DC/DC-Converter
Output Current vs Input Voltage
R-5xxxPA_DA
Series
How to calculate the max output current
The internal power dissipation(P
D
)follows the equation:
P
D
= Io × Vo × (1-η)
Io = P
D
/ Vo × (1-η)
Where
P
D
= Internal power dissipation
Io = Output current
Vo = Output voltage
η
= Efficiency
Example: R-545.0P , at Vin = 18Vdc , Vo = 5Vdc ,η=93% (see "Selection Guide" table)
(a) When Ta = 60°C , P
D
= 1.4 Watt (see adjacent diagram)
Io = 1.4(W) / 5(V) × (1-0.93) = 4(A)
(b) When Ta = 85°C , P
D
= 1 Watt (see adjacent diagram)
Io = 1(W) / 5(V) × (1-0.93) = 2.857(A)
(c)
At Vin = 12Vdc efficiency = 94% (see "Selection Guide" table)
When Ta = 85°C , P
D
= 1 Watt (see adjacent diagram)
Io = 1(W) / 5(V) × (1-0.94) =3.33(A)
Ambient Temperature (°C)
90
85
80
60
40
20
0
0.5
1
1.4
Internal Power Dissipation (W)
Characteristics
R-53xx / R-54xx
Output Voltage Line Regulation VS Vout
1
R-52xx / R-55xx
Output Voltage Line Regulation VS Vout
1
Line Regulation (%)
Line Regulation (%)
0
1.8
1.2
Output Voltage (V)
2.3
3.3
5.0
0.5
0.5
0
1.8
1.2
Output Voltage (V)
2.3
3.3
5.0
R-53xx / R-54xx
Intput Voltage Load Regulation VS Vin
2.0
1.5
1.2V
1.8V
2.5V
3.3V
5.0V
R-52xx / R-55xx
Intput Voltage Load Regulation VS Vin
2.0
1.5
Load Regulation (%)
1.0
0.5
Load Regulation (%)
1.0
0.5
1.2V
1.8V
2.5V
3.3V
5.0V
0
0
5
Input Voltage (V)
10
15
20
5
Input Voltage (V)
10
15
20
158
27-March-2007
www.recom-international.com
RECOM [ RECOM INTERNATIONAL POWER ]
