參數(shù)資料
型號： L584
廠商： 意法半導(dǎo)體
英文描述： MULTIFUNCTION INJECTION INTERFACE
中文描述： 多功能注射液界面
文件頁數(shù)： 11/13頁
文件大?。?/td> 178K
代理商： L584
Figure 9
: Applicationcircuit showinghow two separatesuppliescan be used.
In this application it is assumed that the 5V supply
for L584 is taken from a logic supply, which is al-
ready protected,againstload dump transientsand
vol-tagereversal.
Pin 1 must be left open,as shownin fig. 9, if V
S
is
alwL
sieR
Note that t
off
is also related to the required current
ripple
I on the peak or on the holdingcurrent level
by :
(I
o
–
I) R
L
+ V
off
t
off
= –
ln
I
o
R
L
+ V
off
Where:IoistheinitialcurrentvalueinOFFcondition
(equalto Ip or IHin accordanceto the current level
considered),
V
OFF
= V
DIODE
+ V
CEQ1
R
L
is the series resistance value of the induc-
tanceL :
ThereforeC
2
canbe dimensioneddirectly by :
I
REF
L
12
ln
R
L
(I
o
–
I) R
L
+ V
OFF
I
o
R
L
+ V
OFF
C
2
=
Notethatt
off
isthe sameforboth thepeakandhold-
ingcurrent.
t
on
timeis given by:
L
V
on
– R(I1 –
I)
t
on
=
ln
R
V
on
– RI1
where : I1 is the final current valuein ONcondition
(equalto I
p
or I
H
in accordanceto the current level
considered),
R =R
L
+ R
SENSE
V
on
= V
S
– V
CE
satQ2
If the constanttimes are respectively
L
>20 t
off
and
R
it is possibleto considerapurelyinductiveload and
therefore:
I
t
off
= L
V
o
L
R
> 20 t
on
I
V
on
; t
on
= L
L584
11/13
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