PT78HT200 Datasheet, PDF (2/3 Pages) Texas Instruments – 2 AMP POSITIVE STEP-DOWN INTEGRATED SWITCHING REGULATOR

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PT78HT200 S e r i e s
CHARACTERISTIC DATA
PT78HT233 3.3 VDC (See Note 1)
PT78HT205 5.0 VDC (See Note 1)
Efficiency vs Output Current
100
90
80
70
60
50
40
0
0.5
1
1.5
Iout-(Amps)
Vin
9.0V
10.0V
15.0V
2
Ripple vs Output Current
120
100
80
60
40
20
0
0
0.5
1
1.5
Iout-(Amps)
Vin
26.0V
20.0V
15.0V
10.0V
9 .0V
2
Thermal Derating (T_a) (See Note 2)
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
9
70°C
60°C
50°C
85°C
12
15
18
21
24
27
30
Vin-(Volts)
Power Dissipation vs Output Current
2.5
2
Vin
26.0V
1.5
20.0V
15.0V
10.0V
1
9.0V
0.5
0
0
0.5
1
1.5
2
Iout-(Amps)
Efficiency vs Output Current
100
90
80
70
60
50
40
0
0.5
1
1.5
Iout-(Amps)
Vin
9.0V
12.0V
15.0V
18.0V
24.0V
28.0V
2
Ripple vs Output Current
120
100
80
60
40
20
0
0
0. 5
1
1. 5
Iout-(Amps)
Vin
28.0V
24.0V
18.0V
15.0V
12.0V
9.0V
2
Thermal Derating (Ta) (See Note 2)
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
9
70°C
50°C
60°C
85°C
12
15
18
21
24
27
30
Vin-(Volts)
Power Dissipation vs Output Current
2. 5
2
1. 5
1
0. 5
0
0
0. 5
1
1. 5
Iout-(Amps)
Vin
28.0V
24.0V
18.0V
15.0V
12.0V
9.0V
2
Note 1: All data listed in the above graphs, except for derating data, has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
Note 2: Thermal derating graphs are developed in free air convection cooling of 40-60 LFM. (See Thermal Application Notes.)
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