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Typical Characteristics

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

7

1013

1619

2225

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4

7

1013

1619

0

0.1

0.2

0.3

0.4

0.5

0.6

7

111519

PT78NR105 -5.0 VDC

(See Note A)

PT78NR109 -9.0 VDC

(See Note A)

Efficiency vs Output Current

Ripple vs Output Current

(See Note B)

Power Dissipation vs Output Current

Note A:

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 B:

Thermal derating graphs are developed in free air convection cooling of 40-60 LFM. (See Thermal Application Notes.)

Iout-(Amps)

Iout-(Amps)

Iout-(Amps)

Iout-(Amps)

Iout-(Amps)

Iout-(Amps)

Vin-(Volts)

Vin-(Volts)

Vin-(Volts)

40

50

60

70

80

90

100

0

0.2

0.4

0.6

0.8

1

7.0V

12.0V

15.0V

20.0V

25.0V

Vin

0

40

80

120

160

200

0

0.2

0.4

0.6

0.8

1

25.0V

20.0V

15.0V

12.0V

7.0V

Vin

85°C

60°C

85°C

70°C

85°C

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

0

0.1

0.2

0.3

0.4

0.5

21.0V

18.0V

15.0V

12.0V

7.0V

Vin

40

50

60

70

80

90

100

0

0.1

0.2

0.3

0.4

0.5

7.0V

12.0V

15.0V

18.0V

21.0V

Vin

0

40

80

120

160

200

0

0.1

0.2

0.3

0.4

0.5

21.0V

18.0V

15.0V

12.0V

7.0V

Vin

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2

0

0.2

0.4

0.6

0.8

1

25.0V

20.0V

15.0V

12.0V

7.0V

Vin

70°C

70°C

Efficiency vs Output Current

Efficiency vs Output Current

Ripple vs Output Current

Ripple vs Output Current

(See Note B)

(See Note B)

Power Dissipation vs Output Current

Power Dissipation vs Output Current

PT78NR100 Series

1 Amp Plus to Minus Voltage

Integrated Switching Regulator

40

50

60

70

80

90

100

0

0.1

0.2

0.3

0.4

Iout-(Amps)

7.0V

9.0V

12.0V

15.0V

18.0V

0

50

100

150

200

250

0

0.1

0.2

0.3

0.4

Iout-(Amps)

18.0V

15.0V

12.0V

9.0V

7.0V

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

0

0.1

0.2

0.3

0.4

Iout-(Amps)

18.0V

15.0V

12.0V

9.0V

7.0V