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參數(shù)資料
| 型號： | GS-D200S |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 2/2.5A Bipolar Stepper Motor Driver Modules(2/2.5A雙極型步進電機驅(qū)動器模塊) |
| 中文描述： | 2/2.5A雙極步進電機驅(qū)動器模塊（2/2.5A雙極型步進電機驅(qū)動器模塊） |
| 文件頁數(shù)： | 15/17頁 |
| 文件大?。?/td> | 183K |
| 代理商： | GS-D200S |
P
pw
= 1.1
[2
1.8
1
0.25+2
1
1
0.75 + 0.5
1]
P
pw
= 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
(V
satsink
) and a diode. The power dissipation is,
therefore:
P
pw
= 1.1
[2 V
sat
I
ph
D.C.+(V
sat
+V
d
)
I
ph
(1-D.C.)]
P
pw
= 1.1
[2
1.8
1
0.25 + (1.8 + 1)
1
0.75]
P
pw
= 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 DECAYmode, because one phase is ener-
gized at any given time.
NORMALMODE. At any given time, two windings
are alwaysenergized. 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
powerdissipation 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
6.38 W
Slow Decay
3.30 W
6.60 W
6.60 W
G
Calculate the total power dissipation for the GS-
D200 :
P
tot
= P
logic
+ P
pw
In this example, for slow decay and normal mode
P
tot
= 1.1 + 6.6 = 7.7 W
G
The case temperature can now be calculated:
T
case
= T
amb
+ (P
tot
R
th
) = 55+ (7.7
5)= 93.5
°
C
G
If the calculated case temperature exceeds the
maximum allowed case temperature, as in this
example,an external heat-sink is required and the
thermalresistance canbe calculated according to:
Rth
tot
=
T
cmax
Tamb
P
tot
=
85
55
7.7
=
3.9
°
C
and then
Rth
hs
=
Rth
Rth
tot
Rth
Rth
tot
=
5
3.9
5
3.9
=
17.7
°
C
The following table gives the thermal resistanceof
some commerciallyavailable heath-sinksthat fit on
the GS-D200 module.
Manufacturer Part Number
R
th
(
°
C/W)
Mounting
Thermalloy
6177
3
Horizontal
Thermalloy
6152
4
Vertical
Thermalloy
6111
10
Vertical
Fischer
SK18
3
Vertical
Assman
V5440
4
Vertical
Assman
V5382
4
Horizontal
15/17
GS-D200/GS-D200S
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