參數(shù)資料
型號(hào): L294
廠商: 意法半導(dǎo)體
英文描述: SWITCH-MODE SOLENOID DRIVER
中文描述: 開(kāi)關(guān)模式電磁驅(qū)動(dòng)
文件頁(yè)數(shù): 6/8頁(yè)
文件大?。?/td> 115K
代理商: L294
6/8
Figure 5. Safe Operating Areas.
Figure 6. Turn-off Phase.
CALCULATION OF THE SWITCHING TIMES
Referring to the block diagram and to the waveforms of fig. 1, it is possible to calculate the switching times
by means of the following relationships.
t
r
=
L
V
1
I
p
)
t
f
=
L
R
L
V2
+
R
L
I
o
R
L
In
(
1
R
L
where : V1 = V
s
- V
sat L
- V
sat H
_ V
R sens
In
V2
where : V2 = V
s
+ V
D1
+ V
D2
I
K
I
o
I
p
I
o
is the value of the load current at the end of t
on
.
t
1
= t
3
= t
5
= ...
a
)
L
R
L
In
0.9 I
p
R
L
+
V3
I
p
R
L
+
V3
b
)
R1 C1 In 0.9
1
where
V3 = V
sat L
+ V
R sens
+ V
D1
10
R1
C1
t
2
= t
4
= t
6
= ...
=
L
R
L
In
(
V1
I
p
R
L
V1
I
K
R
L
)
Note that the time interval t
1
= t
3
= t
5
= ... takes the longer value between case a) and case b). The switching
frequency is always :
f
switching
=
1
t
1
+
t
2
In the case a) the main regulation loop is always closed and it forces :
I
K
= (0.9
±
S) I
p
where : S = 3 % @ Vi = 1 V
S = 1.5 % @ Vi = 4 V
In the case b), the same loop is open in the recirculation phase and I
K
, which is always lower than 0.9 I
p
,
is obtained by means of the following relationship.
I
K
=
I
p
e
t
1
R
L
L
V3
R
L
(
1
e
t
1
R
L
L
)
With the typical application circuit, in the conditions Vs = 40V, Ip = 4A, the following switching times result:
t
r
= 255
μ
s t
f
= 174
μ
s @ I
o
= I
p
μ
s
t1 = a) 70
μ
s t2 = 29
μ
s f = 10.2 KHz
=
L294
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