Long Term Safe Operating Area Curves*

Disable Circuit

Thermal Considerations

20 mA Max.

Disable

DIS+

DIS–

+

V

TIME (SECONDS)

1s

0

10

100ms

-1

10

10ms

-2

10

1ms

-3

10

100

µs

-4

10

10

µs

-5

10

1

µs

-6

10

-600

-500

-400

-300

-200

-100

0

100

200

300

400

500

600

Ratings Exceeded

Reverse Polarity

Protection

50V

OVP

TIME (SECONDS)

1s

0

10

100ms

-1

10

10ms

-2

10

1ms

-3

10

100

µs

-4

10

10

µs

-5

10

1

µs

-6

10

600

400

200

0

200

400

600

800

Ratings Exceeded

Reverse Polarity

Protection

500V

OVP

400V

28Vdc Input

270Vdc Input

* 1% duty cycle max., for short duration transient capability refer to specifications

• Thermal impedance, chassis-to-air, is provided for 1-up, 2-up and 3-up MI-ComPAC

package configurations as a function of air flow.

• Case temperature = (total power dissipated x thermal impedance) + ambient temperature.

• Watts dissipated per output = (output power ÷ efficiency) – output power.

Thermal Impedance — Case-to-Air (°C/W)

Standard Units

1-up

2-up

3-up

1-up

2-up

3-up

Free Air (Horiz.)

3.6

1.7

1.4

2.1

1.3

1.0

Forced Convection Through Heat Sink Fins

50 LFM

2.7

1.4

1.3

1.5

1.1

0.9

100 LFM

2.3

1.3

1.1

1.2

0.9

0.7

250 LFM

1.6

1.0

0.8

0.7

0.5

0.4

500 LFM

1.2

0.7

0.6

0.4

0.3

0.3

750 LFM

0.9

0.5

0.5

0.3

0.2

0.2

1000 LFM

0.8

0.4

0.4

0.2

0.2

0.2

Disable Current

• 4mA DC minimum for 1-up ComPAC

• 8mA DC minimum for 2-up ComPAC

• 12mA DC minimum for 3-up ComPAC

The MI-ComPAC incorporates an optically isolated master disable input which will shut down the

MI-ComPAC when a current is driven through the disable terminals.

MI-ComPAC 11/02

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