參數(shù)資料
型號(hào)： 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)： 6/13頁
文件大小： 178K
代理商： L584
ferred,inthe followingformula,toI
E
, emittercurrent
of the external darlingtonQ2,
I
E
= I
LOAD
+ I
dn
becausethe sensing detectionis on the darlington
emitter (not directly on theload).
The peak current level I
p
, is set by the sensingre-
sistor,R
s
, and is found from :
I
p
=0.45 /R
s
(typ)
The peakvalue of holding current level,I
h
, is set by
a voltage(V
set
) applied to pin 2, giving :
I
hp
= V
setth
/ R
s
= (V
set
±
10mV)/R
s
The peak to holdcurrent ratio is fixed by V
set
:
I
p
/I
hp
= 0.45/ V
setth
V
set
is fixed by an externalreferenceand a voltage
divider (V
ext
, R1, R2 infig 2) :
V
set
= V
ext
* R2 / (R1 + R2)
Dueto theparticulardarlingtonstoragetimeandthe
devicereaction timenot very significant differences
canbefoundbetweenI
p
andI
h
valuesbasedonthe
previousformulaandtherealvaluesseenin theap-
plications.
Iftheholding current functionisnotused,pin2can-
notbeleftfloatinganditmustbeconnectedtoGND.
Figure 2
: ApplicationCircuit Showingthe OptionalComponents.In particularit illustrates how theholding
currentlevel is adjustedindependentlyofthepeakcurrent(with R1, R2,V
ext
) andhow theinternal
zener clamp is connected.This circuit producesthe waveformsshownin Fig. 4.
I
o
(A)
4
8
12
Q1
Q2
BDX54
BDW94
BDV64
BDX53
BDW93
BDV65
Figure 3
: P.C. Board and ComponentsLayout of theCircuit of Fig. 2 (1 : 1 scale).
L584
6/13
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