DTC646 datasheet(10/30 Pages) MICROCHIP

10 / 30 page

TC646

DS21446D-page 10

 2002-2012 Microchip Technology Inc.

5.0

TYPICAL APPLICATIONS

Designing with the TC646 involves the following:

(1) The

temperature

sensor

network

must

configured to deliver 1.25V to 2.65V on VIN for 0%

to 100% of the temperature range to be regulated.

(2) The auto-shutdown temperature must be set

with a voltage divider on VAS.

(3) The output drive transistor and associated circuitry

must be selected.

(4) The SENSE network, RSENSE and CSENSE, must

designed

for

maximum

efficiency

while

delivering adequate signal amplitude.

(5) If shutdown capability is desired, the drive require-

ments of the external signal or circuit must be

considered.

The TC642 demonstration and prototyping board

(TC642DEMO)

and

the

TC642

Evaluation

Kit

(TC642EV) provide working examples of TC646 cir-

cuits and prototyping aids. The TC642DEMO is a

printed circuit board optimized for small size and ease

of inclusion into system prototypes. The TC642EV is a

larger board intended for benchtop development and

analysis. At the very least, anyone contemplating a

design using the TC646 should consult the documenta-

tion for both TC642EV (DS21403) and TC642DEMO

(DS21401). Figure 5-1 shows the base schematic for

the TC642DEMO.

FIGURE 5-1:

Typical Application Circuit.

FAULT

SENSE

NTC

GND

*See cautions regarding latch-up considerations in Section 5.0, "Typical Applications".

**Optional. See Section 5.0, "Typical Applications", for details.

NOTES:

Thermal

Shutdown

Shutdown**

+12V

+5V*

VDD

VIN

VAS

VOUT

RBASE

RSENSE

CSENSE

μF

TC646

Fan

0.01

μF

0.01

μF

+5V

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