Rainbow-electronics MAX5085 Manual de usuario descargar pdf (Pagina 8)

MAX5084/MAX5085

Use Figure 3 to determine the allowable package dissi-

pation for a given ambient temperature. Alternately, use

the following formula to calculate the allowable pack-

age dissipation:

After determining the allowable package dissipation,

calculate the maximum output current using the follow-

ing formula:

The above equations do not include the negligible

power dissipation from self-heating due to the device’s

ground current.

Example 1:

= +85°C

= 14V

OUT

= 5V

Find the maximum allowable output current. First calcu-

late package dissipation at the given temperature as

follows:

= 1.905W – 0.0238W/°C (85°C – 70°C) = 1.548W

Then determine the maximum output current:

Example 2:

= +125°C

= 14V

OUT

= 3.3V

Calculate package dissipation at the given temperature

as follows:

= 1.905W – 0.0238W/°C (125°C – 70°C) = 596mW

And establish the maximum output current:

Example 3:

= +50°C

= 9V

OUT

= 5V

OUT MAX()

−

596

14 3 3

OUT MAX

()

−

1 548

14 5

172

OUT(MAX)

– V

OUT

≤ 200mA

W for T C

WWCxTCfor C T C

.–. / ( )

≤+ °

°−°+°<≤+°













1 905 70

1 905 0 0238 70 70 125

65V, 200mA, Low-Quiescent-Current

Linear Regulators in TDFN

8 _______________________________________________________________________________________

= 6.5V

TO 65V

OUT

= 2.5V TO 11V

(200mA)

10µF

OUT

OUT_SENSE

SET

LOAD

GND

MAX5084

MAX5085

Figure 2. Adjustable Output Voltage Operation

MAX5084 fig03

TEMPERATURE (°C)

(W)

20 40 60 80 100 120 140-20 0

0.6

0.4

0.2

0.8

1.0

1.2

1.4

1.6

1.8

2.0

2.2

2.4

-40

MAXIMUM POWER

1.905W

DERATE

23.8mW/°C

Figure 3. Calculated Maximum Power Dissipation vs.

Temperature

1 2 3 4 5 6 7 8 9 10 11

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Rainbow-electronics MAX5085 Manual de usuario Pagina 8

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