GS-D200 datasheet(15/17 Pages) STMICROELECTRONICS

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Ppw =1.1

• [2•1.8•1•0.25+2•1•1•0.75 + 0.5 • 1]

Ppw =1.1

• [0.9 + 1.5 + 0.5] = 3.19 W

The factor 1.1 takes into account the power dissi-

pation during the switching transient.

SLOW DECAY. The power dissipation during the

ON period is the same. The RECIRCULATION is

made internally through a power transistor

(Vsatsink) and a diode. The power dissipation is,

therefore:

Ppw = 1.1

•[2 Vsat•Iph •D.C.+(Vsat+Vd)•Iph •(1-D.C.)]

Ppw =1.1

•[2•1.8 •1•0.25 + (1.8 + 1) • 1 • 0.75]

Ppw =1.1

• [0.9 + 2.1] = 3.3 W

WAVE MODE. When operating in this mode the

power dissipation is given by values of FAST and

SLOW DECAY mode, because one phase is ener-

gized at any given time.

NORMAL MODE. At any given time, two windings

are always energized. The power dissipation of the

power output stage is therefore multiplied by a

factor 2.

HALF STEP. The power sequence, one-phase-on,

two-phase-on forces the power dissipation to be

1.5 times higher than in WAVE MODE when the

motor is running. In stall condition the worst case

for power dissipation is with two-phase-on i.e. a

power dissipation as in NORMAL MODE.

The following table summarizes the power dissipa-

tions of the output power stage of the GS-D200

when running for this example:

Wave

Normal

Half Step

Fast Decay

3.19 W

6.38 W

Slow Decay

3.30 W

6.60 W

Calculate the total power dissipation for the GS-

D200 :

Ptot =Plogic +Ppw

In this example, for slow decay and normal mode

Ptot = 1.1 + 6.6 = 7.7 W

The case temperature can now be calculated:

Tcase =Tamb +(Ptot

•Rth) = 55 + (7.7 • 5) = 93.5 °C

If the calculated case temperature exceeds the

maximum allowed case temperature, as in this

example, an external heat-sink is required and the

thermal resistance can be calculated according to:

Rthtot

Tcmax

− Tamb

Ptot

− 55

7.7

= 3.9 °C

and then

Rthhs

Rth

⋅ Rthtot

Rth

− Rthtot

⋅ 3.9

− 3.9 =

17.7

°C

The following table gives the thermal resistance of

some commercially available heath-sinks that fit on

the GS-D200 module.

Manufacturer Part Number

Rth (°C/W)

Mounting

Thermalloy

6177

Horizontal

Thermalloy

6152

Vertical

Thermalloy

6111

Vertical

Fischer

SK18

Vertical

Assman

V5440

Vertical

Assman

V5382

Horizontal

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