Datasheet

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ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
MDC_ULS-30W_C07 Page 10 of 30
TYPICAL PERFORMANCE CURVES, ULS-5/6-D48
Current Limit
Effi ciency vs. Line Voltage and Load Current @ 25°C
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
VIN = 75V
V
IN = 60V
V
IN = 48V
V
IN = 36V
Efficiency (%)
Load Current (Amps)
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
7.0 7.2 7.4 7.6 7.8 8.0 8.2
VIN = 75V
V
IN = 60V
V
IN = 48V
V
IN = 36V
Output Load Current (Amps)
INFRARED THERMAL IMAGE, ULS-5/6-D48
Thermal image with hot spot at half current with 25°C ambient temperature. Natural convention is used with no forced airfl ow. Identifi able and recommended maximum value to
be verifi ed in application. Vin=48V, Q7 max temp=120°C/IPC9592 guidelines.
47.9°C
91.5°C
50
60
70
80
90
Q7: 82.9
R4: 80.1
R20: 82.3
Q6: 81.3
T1: 78. 1
(+Vin) (+Vout)
(-Vin) (-Vout)
Power Dissipation vs. Load Current @ 25°C
0.5
1.0
1.5
2.0
2.5
3.0
3.5
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
VIN = 75V
V
IN = 60V
V
IN = 48V
V
IN = 36V
Loss (Watts)
Load Current (Amps)
Maximum Current Temperature Derating at Sea Level
(VIN = 36-75V, airfl ow is from pin 3 to pin 1)
0
1
2
3
4
5
6
7
30 35 40 45 50 55 60 65 70 75 80 85
0.33 to 2.0 m/s (65 to 400 LFM)
Output Current (Amps)
Ambient Temperature (ºC)