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參數(shù)資料
| 型號： | L9480VB |
| 廠商： | 意法半導體 |
| 英文描述： | One Chip Car Alternator Regulator(單片汽車交流發(fā)電機穩(wěn)壓器) |
| 中文描述： | 單芯片汽車發(fā)電機調(diào)節(jié)器（單片汽車交流發(fā)電機穩(wěn)壓器） |
| 文件頁數(shù)： | 2/5頁 |
| 文件大小： | 75K |
| 代理商： | L9480VB |
PIN CONNECTION
(top view)
ABSOLUTE MAXIMUMRATINGS
Symbol
V
S
Parameter
Value
80
Unit
V
Transient Overvoltage :
Load Dump : 5ms
≤
T
rise
≤
10ms,
τ
f
Fall Time Constant
≤
100ms, R
source
≥
0.5
Current into Low Energy Clamping Zener
(T
rise
= 5
μ
s ; T
decay
≤
2ms ; duty cycle
≤
5%)
Maximum OutputCurrent
Junction and Storage Temperature Range
I
clamp
100
mA
I
out
5.5
A
°
C
T
j
, T
stg
– 55 to + 150
THERMAL DATA
Symbol
R
th i-case
Parameter
Value
3
Unit
°
C/W
Thermal Resistance Junction-case
Max.
DEVICE OPERATION
The alternatorvoltage, rectifiedby the auxiliary di-
ode trio, is compared with an external reference
and the resulting signal switches the output stage,
drivingthe alternator fieldcoil.
As the regulator is a self-oscillating type, the
switching frequency depends on the whole sys-
tem parameter set (including the alternator char-
acteristics).
The regulator has an integrated filter in the volt-
age sensing path. Consequently it doesn’t need -
in the standard application- any external compo-
nent.
Anyway an external capacitor (0.1 - 1
μ
F) must be
inserted between V
S
and Ground guaranteeing
the correct behaviour of the device when the rec-
tifying diodes feature very high switching spikes
that are not filtered by the devices.
This external capacitor must also be used when
the impedances of the cables connecting the al-
ternator to the battery are so high to cause a su-
perimposedripple on the alternatorvoltage higher
than3-4V.
The devices regulation voltage and the tempera-
ture coefficient may be independently set by
suited metal mask selections ; furthermore the
regulation voltage is trimmed within
±
1% of the
nominalvalue @25
°
C.
The devices have an unique -and patented- sys-
tem to compensatethe self-heatingof the die due
to the power dissipated in the output stage.In this
way the internal reference voltage tracks the case
temperaturerather than the die one.
The device can withstand the reverse battery and
the load dump (up to 80V) ; They can absorb, into
the internal clamping zeners, low energy spikes
up to a level of 100mA and its output is short cir-
cuit protected.
Finally the internal thermal shutdown avoids any
possible device damage due to overtemperature
problems.
L9444VB -L9448VB - L9480VB
2/5
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