17-Apr-07

Derating Curves

ICH/IFH Series

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Power Dissipated vs Ambient Temperature And Air Flow - ICH50-150S

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Ambient Temperature (˚C)

Natural Convection

20ft./min. (0.1 m/s)

100 ft./min. (0.5 m/s)

200 ft./min. (1.0 m/s)

300 ft./min. (1.5 m/s)

400 ft./min. (2.0 m/s)

500 ft./min. (2.5 m/s)

600 ft./min. (3.0 m/s)

700 ft./min. (3.5 m/s)

800 ft./min. (4.0 m/s)

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Power Dissipated vs Ambient Temperature And Air Flow - IFH200S

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5

10

15

20

25

30

35

40

45

Ambient Temperature (C)

Natural Convection

20ft./min. (0.1 m/s)

100 ft./min. (0.5 m/s)

200 ft./min. (1.0 m/s)

300 ft./min. (1.5 m/s)

400 ft./min. (2.0 m/s)

500 ft./min. (2.5 m/s)

600 ft./min. (3.0 m/s)

700 ft./min. (3.5 m/s)

800 ft./min. (4.0 m/s)

THERMAL RESISTANCE vs AIR FLOW

Air Flow Rate

Typical Rca

Natural Convection 20 ft./min (0.1 m/s)

7.12 ˚C/W

100 ft./min (0.5 m/s)

6.21 ˚C/W

200 ft./min (1.0 m/s)

5.17 ˚C/W

300 ft./min (1.5 m/s)

4.29 ˚C/W

400 ft./min (2.0 m/s)

3.64 ˚C/W

500 ft./min (2.5 m/s)

2.96 ˚C/W

600 ft./min (3.0 m/s)

2.53 ˚C/W

700 ft./min (3.5 m/s)

2.37 ˚C/W

800 ft./min (4.0 m/s)

2.19 ˚C/W

Temperature Rise = Pd x Rca

Output may be trimmed by ±10% (±5% for dual output models)

with a fixed resistor or an external trimpot as shown.

ON/OFF

-Vin

A HIGH SIGNAL HERE

WILL DISABLE OUTPUT

+SENSE

-SENSE

TRIM DOWN

TRIM UP

TRIM

+SENSE

TRIM

-SENSE

10K ohms

TRIMPOT

+Vo

-Vo

Ceramic

0.1 µF

Solid tantalum

10 µF

To

Scope

Resistor

Load

Output noise is measured with a 10 µF tantalum capacitor

and 0.1 µF ceramic capacitor across output.

Application Notes

Remote On/Off Control

External Output Trimming

Output Noise

LOGIC TABLE

Logic State (Pin 2)

Negative Logic

Positive Logic

Logic Low Switch Closed

Module On

Module Off

Logic High Switch Open

Module Off

Module On