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L482D1 데이터시트 PDF




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부품번호 L482D1 기능
기능 HALL.EFFECT PICKUP IGNITION CONTROLLER
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L482D1 데이터시트, 핀배열, 회로
L482
HALL–EFFECT PICKUP IGNITION CONTROLLER
. DIRECT DRIVING OF THE EXTERNAL PO-
WER DARLINGTON
. COIL CURRENT CHARGING ANGLE (DWELL)
CONTROL
. COIL CURRENT PEAK VALUE LIMITATION
. CONTINUOUS COIL CURRENT PROTECTION
. CONDUCTION AND DESATURATION TIME
OUTPUT SIGNALS
. PERMANENT CONDUCTION PROTECTION
RESET OUTPUT SIGNAL
. OVERVOLTAGE PROTECTION FOR EXTER-
NAL DARLINGTON
. LOAD DUMP PROTECTION
DIP16
DE S CRI P T IO N
The L482 is an integrated circuit designed for use
with an NPN darlington in breakerless ignition sy-
stems with hall-effect pickup sensors and high ener-
gy ignition coils.
It controls the energy stored in the ignition coil and
the desaturation time of the external darlington to
limit the power dissipation.
PIN CONNECTIONS (top views)
SO16
ORDERING NUMBERS : L482 (DIP16)
L482D1 (SO16)
The L482 is also particularly suitable for use as igni-
tion control and driving stage in more sophisticated
car electronic systems which employ microproces-
sor circuits.
DIP16
SO16
November 1991
1/11




L482D1 pdf, 반도체, 판매, 대치품
L482
PIN FUNCTIONS (continued)
N° Name
13 GROUND
14 DRIVER COLLECTOR
15 OVERVOLTAGE
LIMITATION
Function
This pin must be connected to ground.
The collector current for the internal driver which drives the external
darlington is supplied through this pin. The external resistor R10 limits the
dissipation in the IC. The value of the resistor depends is a function of the
darlington used and on the limiting current in the coil.
The external is protected against overvoltage by means of an internal
zener available at this pin. The external divider R5/R6 defines the limitation
value, given as first approximation by:
Vovp
=
30
R5
+
5
103
R6
+
30
16
DRIVING STAGE
Current Driver for the External Darlington. To ensure stability and precision
OUTPUT
of Tdesat C3 and R3 must be used. Recommended value for R3 is 2Kin
order not to change the open loop gain of the system.
RC may be added to C3 to obtain greater flexibility in various application
situations.
C3 and RC values ranges are 1 to 100nF and 5 to 30Kdepending on the
external darlington type.
(*) These pins refer only to the DIP package type.
For the SO 16 version the permanent conduction reset output signal is not available and the pin 9 becomes the current sensing input. Pin 10
replaces the pin 11 function, pin 11 becomes the power supply input and pin 12 is used as the signal ground.
ELECTRICAL CHARACTERISTICS (VS = 14 V, – 40°C Tj 125°C referred to application circuit of
figure 3 regarding DIP-16 package version)
Symbol
VS
IS
VZ
VI
II
VHz
IHZ
VCE sat
(V14–V16)
VSENS
I3D
I3C
I3C/I3D
VOVZ
V7
td
Parameter
Test Conditions
Operating Supply Voltage
Supply Current
V12 = 4.5V
Zener Voltage (pin 12)
Sensor Input (pin 2)
LOW Voltage
HIGH
IZ = 80mA
Sensor Input Current (pin 2)
VI = LOW
VS = 6 to 16V
Hall-cell Supply Zener Voltage IHz = 10mA
(pin5)
Hall-cell Supply Zener Current t = 10ms
(pin5)
TAMB = 25°C
Series Darlington Driver Sat. Io = 70mA
Voltage
Io = 150mA
Current Limit. Sensing Voltage VS = 6 to 16V
(pin10)
C2 Discharge Current
C2 Charge Current
VS = 6 to 16V
(*) Note 1
External Darlington Overvoltage IOVZ = 5mA to 15mA
Protection Zener Voltage
TAMB = 25°C
Reference Voltage
Desaturation Time
f = 40Hz VS = 14V
Min.
6
6.5
Typ.
Max.
28
25
8.8
Unit
V
mA
V
0.5 V
2.5 V
–12 –1 mA
19 22 25
V
100 mA
0.6
0.4 1.0
V
V
200 400 mV
0.2 3.4 µA
5 20 µA
6 35
25 30 35
V
2.5 3.5 V
0.6 1.2 1.57 ms
4/11

4페이지










L482D1 전자부품, 판매, 대치품
Figure 4 : Application Circuit (SO–16).
L482
CIRCUIT OPERATION
The L482controlthe conduction time (dwell) and the
peak value of the primary current in the coil over the
full range of operating conditions.
The coil current is limited to a predetermined level
by means of a negative feedback circuit including a
current sensing resistor, a comparator, the driver
stage and the power switch.
The dwell control circuit maintains the output stage
in its active region during current limitation. The time
the output stage is in the active region (desaturation
time) is sufficient to compensate for possible varia-
tions in the nergy stored due to the acceleration of
the motor ; moreover this time is limited to avoid ex-
cessive power dissipation.
CONTROL OF THE DWELL ANGLE (fig. 1 and 4)
The dwell angle control circuit calculates the con-
duction time D for the output transistor in relation to
the speed of rotation, to the supply voltage and to
the characteristic of the coil.
On the negative edge of the Hall-effect input signal
the capacitor C2 begins discharging with a constant
current I3D. When the set peak value of the coil cur-
rent is reached, this capacitor charges with a con-
stant current I3C = 13.3 x I3D and the coil current is
kept constant by desaturating the driver stage and
the external darlington.
The capacitor C5 starts charging on the positive
edge of the Hall-effect input signal with a constant
current I4C.
The dwell angle, and consequentlythe starting point
of the coil current production, is decided by the com-
parison between VC2 and VC5. A positive hysteresis
is added to the dwell comparator to avoid spurious
effects and C5 is rapidly discharged on the negative
edge of Hall-effects input signal.
In this way the average voltage on C2 increases if
the motor speed decreases and viceversa in order
to maintain constant the ratiotd at any motor speed.
T
td is kept constant (and not d = cost) to control the
power dissipation and to have sufficient time to
avoid low energy sparks during acceleration.
The charging time D – td depends on the coil and
the voltage supply.
DESATURATION TIMES IN STATIC CONDI-
TIONS.In static conditions, if C2 = C5 as recommen-
ded and if the values of the application circuit of fig.
3, 4 are used.
td 1
=
T 1 + I3C/I3D
7/11

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L482D1

HALL.EFFECT PICKUP IGNITION CONTROLLER

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