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參數(shù)資料
| 型號： | L6223A |
| 文件頁數(shù)： | 20/33頁 |
| 文件大?。?/td> | 1335K |
| 代理商： | L6223A |
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R
DSON
L =
α
1.2 = 2
R
DSON
H =
α
0.7 = 1.15
R
S
= 0.36
R
tot
= 12.5
V
ON
= 26.24V
V
OFF
= 9.7
DC= 15.6%
T
p
= 8 msec
T
1
= 250
μ
s
PdL = 1.1W
PdH = 0.4W
Pdch = 0.20W
Pdo = 0.24W
At last:
P
tot
= 1.94W
The needed thermal resistance between junction
and ambient must be equalto:
(During the chopping)
(Duringthe chopping)
(Duringthe phasechange)
R
thj
amb
=
T
jmasc
T
ambmasc
The worst casP
heatsink of 25
°
C/W. The calculation of the power
dissipation by considering the current imbalance
and by simulating a typical motion needed to
carry the head of a printer for example, becomes
full of difficulties. The use of the Personal Com-
puter is helpful in such a case: few examplesare
shown from Fig. 28ab untilFig. 31 ab.
Each figure shows the Application Datas and one
diagram where the Total Dissipated Powerversus
the peak of the motor current is plotted.
A max Ambient temperature of 70
°
C and a max
junction temperatureof 150
°
C have been consid-
ered for a few applications using one single de-
vice and a dual device configuration to drive one
tot
39
°
C/W
Figure24:
Motor currentIp duringt
ON
(phaseMA; Q5 and R
S
sre commonwhit the phaseMB).
Figure25:
Slowdecay of the motor current I
p
/2 during t
off
(phaseMA).
L6223A
20/33
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