Typical Characteristics
PT4120 Series
20-W 48-V Input Isolated
DC/DC Converter
PT4121, 3.3 VDC (See Note A)
PT4122, 5.0 VDC (See Note A)
PT4123, 12.0 VDC (See Note A)
Efficiency vs Output Current
Efficiency vs Output Current
Efficiency vs Output Current
90
90
90
85
85
80
75
70
65
60
55
50
80
70
60
50
80
Vin
Vin
Vin
75
36.0V
48.0V
75.0V
36.0V
36.0V
48.0V
75.0V
70
65
60
55
50
48.0V
75.0V
0
1
2
3
4
5
0
0.5
1
1.5
2
2.5
3
3.5
4
0
0.2 0.4 0.6 0.8
Iout (A)
1
1.2 1.4 1.6
Iout (A)
Iout (A)
Ripple vs Output Current
Ripple vs Output Current
Ripple vs Output Current
12
10
8
16
14
12
10
8
70
60
50
40
30
20
10
0
Vin
Vin
Vin
75.0V
48.0V
36.0V
75.0V
48.0V
36.0V
75.0V
48.0V
36.0V
6
6
4
4
2
2
0
0
0
1
2
3
4
5
0
0.5
1
1.5
2
2.5
3
3.5
4
0
0.2 0.4 0.6 0.8
Iout (A)
1
1.2 1.4 1.6
Iout (A)
Iout (A)
Power Dissipation vs Output Current
Power Dissipation vs Output Current
Power Dissipation vs Output Current
6
5
4
3
2
1
0
6
5
4
3
2
1
0
6
5
4
3
2
1
0
Vin
Vin
Vin
75.0V
48.0V
36.0V
75.0V
48.0V
36.0V
75.0V
48.0V
36.0V
0
1
2
3
4
5
0
0.5
1
1.5
2
2.5
3
3.5
4
0
0.2 0.4 0.6 0.8
Iout (A)
1
1.2 1.4 1.6
Iout (A)
Iout (A)
Safe Operating Area, Vin =48V (See Note B)
Safe Operating Area, Vin =48V (See Note B)
Safe Operating Area, Vin =48V (See Note B)
90
80
70
60
50
40
30
20
90
80
70
60
50
40
30
20
90
80
70
60
50
40
30
20
Airflow
Airflow
Airflow
200LFM
120LFM
60LFM
200LFM
120LFM
60LFM
200LFM
120LFM
60LFM
Nat conv
Nat conv
Nat conv
0
1
2
3
4
5
0
1
2
3
4
0
0.25 0.5 0.75
1
1.25 1.5 1.75
Iout (A)
Iout (A)
Iout (A)
Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the Converter.
Note B: SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures
For technical support and more information, see inside back cover or visit www.ti.com
ETC [ ETC ]
