Rainbow-electronics MAX6508 Manual de usuario descargar pdf (Pagina 6)

MAX6505–MAX6508

Dual Trip SOT Temperature Switches

6 _______________________________________________________________________________________

Figure 2. Temperature Response—MAX6507A04B Outputs

with 2°C Hysteresis

Figure 3. Low-Power, High-Reliability, Fail-Safe Temperature

Monitor

+75°C

-10

°C

HYSTERESIS ≈ 2°C

-10°C

HYSFERESIS ≈ 2

°C

OVER

TEMPERATURE

+2.5V TO +5.5V

SYSTEM

SHUTDOWN

FAN CONTROL

WARN

GND

ALARM

MAX6506

*∆T

= T

ALARM

- T

WARN

IS SET TO +30°C.

Table 2. Hysteresis Selection

TYPICAL THRESHOLD HYSTERESIS

PART

ALARM CONDITIONS WARN CONDITIONS OK, OVER

2°C — 5°C ∆T

= 5°C or 10°C

MAX6505

MAX6506

——10°C ∆T

= 20°C or 30°C

—

-—— — — 2°C S0 = GND

MAX6507

MAX6508

-—— — — 10°C S0 = V

power is dissipated within the IC. This corresponds to a

+0.288°C shift in the die temperature in the SOT23-6.

Power Supply and Bypassing

The MAX6505 and MAX6508 operate from a single-

supply voltage in the +2.5V to +5.5V range. Connect a

0.1µF capacitor on the supply voltage line close to the

pin for bypassing.

Low-Cost, Fail-Safe Temperature Monitor

The MAX6505/MAX6506 provide two outputs that can be

used for fail-safe temperature applications (Figure 3). For

example, the first output can activate a fan when the die

temperature exceeds a certain preset temperature. The

second output asserts at a higher temperature that could

be caused by a wide variety of destructive fault condi-

tions, including latchup, short circuit, and cooling system

failure. This output can be used to initiate such actions

as shutdown of the entire system (see Typical Operating

Circuits).

The high-level integration, low cost, and small size of the

MAX6505–MAX6508 facilitate the use of multiple temper-

ature monitors to increase system reliability.

1 2 3 4 5 6 7 8 9 10 11 12

MAX6505–MAX6508 1

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