R-726.5D डेटा पत्रक PDF( Datasheet डाउनलोड )

		



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