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參數(shù)資料
| 型號： | L482D1 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO16 |
| 封裝： | SO-16 |
| 文件頁數(shù)： | 10/11頁 |
| 文件大小： | 797K |
| 代理商： | L482D1 |
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DESATURATION TIMES IN LOW AND HIGH FRE-
QUENCY OPERATION. Due to the upper limit of the
voltage range of pin 3, if the components of fig. 3, 4
are used, below 10Hz (300RPM for a 4 cylinder en-
gine) the OFF time reaches its maximum value
(about 50ms) and then the circuit gradually loses the
control of the dwell angle because D = T – 50ms
Over 200Hz (6000RPM for a 4 cylinder engine) the
available time for the conduction is less than 3.5ms.
If the used coil is 6mH, 6A, the OFF time is reduced
to zero and the circuit loses the dwell angle control.
TRANSIENT RESPONSE. The ignition system
must deliver constant energy even during the con-
dition of acceleration and deceleration of the motor
below 80Hz/s. These conditions can be simulated
by means of a signal generator with a linearly modu-
lated frequency between 1Hz and 200Hz (this corre-
sponds to a change between 30 and 6000RPM for
a 4 cylinders engine.
CURRENT LIMIT. The current in the coil is moni-
tored by measuring the Isense current flowing in the
sensing resistor Rs on the emitter of the external dar-
lington. Isense is given by :
Isense = Icoil + I16
When the voltage drop across Rs reaches the inter-
nal comparator threshold value the feedback loop is
activated and Isense kept constant (fig. 1) forcing the
external darlington in the active region. In this con-
dition :
Isense = Icoil
When a precise peak coil current is required R5 must
be trimmed or an auxiliary resistor divider (R1, R2)
added :
VSENS
R1
Icpeak (A)
=
(
+ 1)
RS
R2
PROTECTION CIRCUIT
PERMANENT CONDUCTION PROTECTION
The battery voltage is applied to ignition module by
means of the ignition key. In these conditions, with
the motor stopped, it is necessary that there is no
permanent conduction in the ignition coil irrespec-
tive of the polarity of the input signal.
The L482 incorporates a timing circuit to implement
this protection ; the duration of the intervention is set
by means of a capacitor C1 at pin 8 = 1
F, and
R11 = 100k
, when the input signal is high for more
than 1 s, the coil current gradually decreases down
to zero to avoid spurious sparks (see fig. 2).
This timing allows normal operation of the module
above 30RPM.
DARLINGTON OVERVOLTAGE LIMITATION
The darlington is protected against overvoltage by
means of an external divider R5/R6 (pin 15) and an
internal zener. This zener drives the external dar-
lington in order to limit the collector voltage.
REVERSE BATTERY PRTOTECTION. Due to the
presence of external impedance at pin 5, 10, 11, 14,
15, L482 is protected against reverse battery volt-
age.
DUMP PROTECTION.
The load dump protection withstands up to 100V
with a decay time
≤ 300ms. The intervention thre-
shold for load dump is fixed by means of an external
divider connected to pin 11 (DIP-16 package ver-
sion) or to pin 10 using a Micropackage type.
NEGATIVE SPIKE PROTECTION.If correct oper-
ation is requested also during short negative spikes,
the diode DS and capacitor Cs must be used.
USE OF THE IC ELECTRONIC ADVANCE SYS-
TEM
When the device is digitally controlled the control
unit transmits a suitable input signal to the power
module, receiving in turn information that allows the
control of the dwell and the on time of the final tran-
sistor.
For this reason L482 provides the following outputs :
.
a time signal equal to the time in which the final
Darlington is in the active region i.e. when the coil
current is limited (Vds) as shown in figure 1. This
signal must be TTL compatible.
.
a TTL compatible output from the timing circuit
(Vrs in figure 2). This pulse, available only using
the DIP-16 package version is present after the
protection against cranking transients.
.
a time signal equal to the time in which the final
Darlington, is in "on" condition (Von) i.e. when the
current flows through the coil, see fig. 1.
OTHER APPLICATION INFORMATION
If the supply voltage is disconnected - or the battery
wire is broken - while the current is flowing through
the coil, the external diode D1 keeps the coil current
from recirculating into the device : in this way both
device and darlington are protected.
L482
8/11
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