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L294 Datasheet

  • L294

  • SWITCH-MODE SOLENOID DRIVER

  • 8頁

  • STMICROELECTRONICS   STMICROELECTRONICS

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L294
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.
R
L
where : V1 = V
s
- V
sat L
- V
sat H
_ V
R sens
L
t
r
= 鈭?/div>
In
(1 鈭?/div>
鈥?/div>
I
p
)
V
1
R
L
where : V2 = V
s
+ V
D1
+ V
D2
L
V2
t
f
= 鈭?/div>
In
R
L
V2
+
R
L
鈥?/div>
I
o
I
K
鈮?/div>
I
o
鈮?/div>
I
p
I
o
is the value of the load current at the end of t
on
.
t
1
= t
3
= t
5
= ...
0.9 I
p
鈥?/div>
R
L
+
V3
L
In
I
p
R
L
+
V3
R
L
=
1
b)
鈭?/div>
R1 C1 In 0.9
鈮?/div>
R1
C1
10
V1
鈭?/div>
I
p
R
L
L
In
(
)
= 鈭?/div>
R
L
V1
鈭?/div>
I
K
R
L
錚?/div>
錚?/div>
錚?/div>
a)
鈭?/div>
where
V3 = V
sat L
+ V
R sens
+ V
D1
t
2
= t
4
= t
6
= ...
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
鹵
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
鈭?/div>
t
1
R
L
t
1
R
L
V3
鈭?/div>
(1 鈭?/div>
e
鈭?/div>
)
L
L
R
L
With the typical application circuit, in the conditions Vs = 40V, Ip = 4A, the following switching times result:
t
f
= 174
碌s
@ I
o
= I
p
t
r
= 255
碌s
a) 70
碌s
t1 = b) 16
碌s
6/8
t2 = 29
碌s
f = 10.2 KHz

L294 產(chǎn)品屬性

  • 25

  • 集成電路 (IC)

  • PMIC - 電機(jī)和風(fēng)扇控制器，驅(qū)動(dòng)器

  • -

  • 直流電機(jī)驅(qū)動(dòng)器

  • -

  • 1

  • 4.5A

  • -

  • 12 V ~ 46 V

  • -40°C ~ 150°C

  • 通孔

  • Multiwatt-11（垂直，彎曲和錯(cuò)列引線）

  • Multiwatt-11（垂直，彎曲和錯(cuò)列引線）

  • 管件

  • 497-2938-5

L294相關(guān)型號(hào)PDF文件下載

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    SWITCH-MODE SOLENOID DRIVER
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  • 英文版
    LINEAR INTEGRATED CIRCUIT
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