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參數(shù)資料
| 型號： | AD22001* |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 5-Channel Monolithic Comparator for Lamp Monitoring |
| 中文描述： | 5通道單片比較監(jiān)測燈 |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 146K |
AD22001
REV. A
–4–
cause their common output, OUT 3 & 4, to indicate failure
(registered as a one or high).
T hese comparators are intended for lamp circuits which are
switched simultaneously, but are fused independently. A special
linkage between the comparators causes them to indicate a fault
if common-mode voltage is applied to only one of the pair. T his
functions as a test of both fuses.
One additional output is provided which tests when both lamps
are switched on (whether the lamp circuit draws current or not).
T his circuit signals a zero or low level at OUT (3
3
4) whenever
both lamp circuits are powered (implying fuses are present) and
a one or high level otherwise.
Description of Channels 1 and 2
Comparators 1 and 2 are also linked and share a common out-
put. A fault at either input will register as a one or high at OUT
1 & 2. Otherwise this output will be low. Each of these com-
parators also has a cold lamp test current. T hese comparators
are intended for two lamp circuits which have a common fuse,
and a fuse test line, similar to the brake-light test, is brought
out.
A summary of the tests performed by each channel is given in
T able I.
Signal Outputs
T he signal outputs, OUT 1 & 2, OUT 3 & 4, OUT (3
3
4),
and OUT 5, are NPN collectors with pull-up currents provided
by the power control section. T hese currents are about 75
μ
A
each, and are intended to be sufficient to drive high level CMOS
inputs.
T able I. Summary of Recommended Applications and
T ests Performed for E ach Channel
In a common automotive application, the AD22001 can be used
to monitor the following lamps:
Recommended
Channel
Applications
T ests
Performed
1, 2
Fog Light Front
Fog Light Rear
Number Plate Light
I, II, III
3, 4
Low Beam Headlight
Parking/Position
T aillight
I, II, IV
5
Brake Light
I, III
T he following tests are performed and status indicated with the
AD22001:
T est
Description
I
Hot Lamp T est: Lamp is functional.
T est performed while lamp is switched on.
II
Cold Lamp T est: Lamp is functional.
T est performed while lamp is switched off.
III
Fuse is in place and functional.
IV
T he two monitored light bulbs are powered simulta-
neously. T his can be used as an implicit fuse test.
SWITCH &
LIMITER
4
5
6
9
8
CHANNEL 1
CHANNEL 2
CHANNEL 3
2
1
20
3
7
11
10
13
12
CHANNEL 4
CHANNEL 5
14
15
16
17
19
18
CHIP
ENABLE
GND
–IN1
+IN1
–IN2
+IN2
–IN3
+IN3
–IN4
+IN4
–IN5
+IN5
OUT 5
OUT 3 & 4
OUT (3
×
4)
OUT 1 & 2
SIGNAL OUTPUTS
POWER SUPPLY
OUTPUT
V
OUTPS
INPUTS AND SUPPLY
OUTPUTS
+V
S
IN
FUSE
1 & 2
IN
FUSE
5
R
S
R
S
R
S
R
S
R
S
Figure 3. AD22001 Connection Diagram
T hus, in the absence of voltage applied to light the lamp, the
lamp resistance holds the common-mode voltage low, and no
fault is indicated. When the lamp circuit is powered, voltage on
the comparator inputs activates the comparator which indicates
a fault if the lamp current does not cause the shunt voltage to
exceed the threshold.
Cold Lamp T est
In addition to the standard hot lamp test, four of the compara-
tors have a cold lamp test current of about 60
μ
A applied. If the
lamp circuit is not switched on but the lamp circuit is incom-
plete (failed lamp or connection), the small test current will
raise the common-mode voltage of the comparator at its input
and cause it to indicate a fault. Individual comparator inputs
draw about 10
μ
A each.
Description of Channel 5
T he single comparator in Channel 5 is intended for brake-light
testing. Comparator 5 does not have the cold test feature, since
this lamp is normally tested in conjunction with the brake-light
switch. T he comparator is combined with a fuse test circuit
which checks for battery voltage at its input. T his input
normally connects between the fuse and brake-light switch.
T he outputs of the hot lamp test and the fuse test are combined
at OUT 5 which indicates zero or low as the normal or okay
state and one or high if either test fails. T he output will indicate
a fault if battery voltage is lost from the fuse test line, or if the
lamp circuit is powered, but the circuit fails to draw current.
Description of Channels 3 and 4
Comparators 3 and 4 are linked to test pairs of lamp circuits. In
addition to the hot lamp test, Channels 3 and 4 each have a cold
lamp test current. A fault for either test at input 3 or 4 will
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