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參數(shù)資料
| 型號： | L9305A |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Dual High Current Relay Driver(雙大電流繼電器驅(qū)動器) |
| 中文描述： | 雙高電流繼電器驅(qū)動器（雙大電流繼電器驅(qū)動器） |
| 文件頁數(shù)： | 4/6頁 |
| 文件大小： | 116K |
| 代理商： | L9305A |
APPLICATION INFORMATIONS
(refer to application circuit)
D1 andD2 diodes arerequiredonly for reverse po-
larity protection.
If V
S
maybehigherthanV
ZS
aresistor R
S
isneces-
sary to limit the zener current I
ZS
. In order to deter-
mineR
S
valuethefollowingequationscanbeused:
V
S MAX
– V
D1
– V
ZS min
1)
R
S
2) V
S min
– V
D1
– R
S
– I
SON MAX
> V
ST min
where from T
amb
= 25
°
C :
- V
S MAX
andV
S min
are themaximum and minimum
valuesof power supplyvoltage
- V
D1
is the forwarddiodeD1 voltagedrop
- V
ZS min
= 20 V
- I
ZS MAX
=30 mAfor d.c.mode andI
ZSMAX
=80 mA
for pulsed mode (see Absolutemaximum ratings)
- I
SOM MAX
= 30 mA
- V
ST min
= 3.5V
< I
ZS MAX
If no R
S
value can satisfy the system 1), 2) a more
powerfullexternalzenerD
Z
= 18 V is required.
Then 1) becomes:
V
S MAX
– V
D1
– 18
R
S
< I
DZ MAX
whereI
DZ MAX
is the maximum allowed D
Z
current.
V
A
voltage cannot be higher than 20 V otherwise
output overvoltage protection may be activated.
Morever V
A
must be less than 16 V if short circuit
protectionis required.
D
Z2
=22 to 24 V is a mandatoryforoutput7protec-
tion if V
S
maybe higher than26 V.
MOUNTING INSTRUCTION
TheL9305Aisassembledinanewplasticpackage,
thePowerdip,in which 8 pins (from 9 to 16) areat-
tachedtotheframeandremovertheheatproduced
by the chip.
Figure2and3showtwoways ofheatsinking.In the
first case, a PC board copper area is used as a
heatsinkI = 65 mm. While in the second case, the
device is soldered to an externalheatsink. In both
examples,the thermalresistance junction-ambient
is 35
°
C/W.
Figure2 :
Exampleof HeatsinkUsing PC Board
Copper(I =65 mm).
Figure 3 :
Exampleof an ExternalHeatsink.
L9305A
4/6
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