MAX6645 Ver la hoja de datos (PDF) - Maxim Integrated

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MAX6645

Automatic PWM Fan-Speed Controllers with Overtemperature Output

Maxim Integrated 

Automatic PWM Fan-Speed Controllers with

Overtemperature Output

3) Route the DXP and GND traces parallel and close to

each other, away from any high-voltage traces such

as +12VDC. Avoid leakage currents from PCB conta-

mination. A 20MΩ leakage path from DXP to ground

causes approximately +1°C error.

4) Route as few vias and crossunders as possible to

minimize copper/solder thermocouple effects.

5) When introducing a thermocouple, make sure that

both the DXP and the GND paths have matching

thermocouples. In general, PCB-induced thermocou-

ples are not a serious problem. A copper solder ther-

mocouple exhibits 3µV/°C, and it takes

approximately 200µV of voltage error at DXP/GND to

cause a +1°C measurement error, so most parasitic

thermocouple errors are swamped out.

6) Use wide traces. Narrow traces are more inductive

and tend to pick up radiated noise. The 10-mil widths

and spacings are recommended, but are not

absolutely necessary (as they offer only a minor

improvement in leakage and noise), but use them

where practical.

7) Placing an electrically clean copper ground plane

between the DXP traces and traces carrying high-

frequency noise signals helps reduce EMI.

Chip Information

TRANSISTOR COUNT: 12,518

PROCESS: BiCMOS

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