전자부품 데이터시트 검색엔진 |
|
AD22001 데이터시트(PDF) 4 Page - Analog Devices |
|
AD22001 데이터시트(HTML) 4 Page - Analog Devices |
4 / 8 page AD22001 REV. A –4– cause their common output, OUT 3 & 4, to indicate failure (registered as a one or high). These 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. This 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). This circuit signals a zero or low level at OUT (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. These 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 Table I. Signal Outputs The signal outputs, OUT 1 & 2, OUT 3 & 4, OUT (3 4), and OUT 5, are NPN collectors with pull-up currents provided by the power control section. These currents are about 75 µA each, and are intended to be sufficient to drive high level CMOS inputs. Table I. Summary of Recommended Applications and Tests Performed for Each Channel In a common automotive application, the AD22001 can be used to monitor the following lamps: Recommended Tests Channel Applications Performed 1, 2 Fog Light Front I, II, III Fog Light Rear Number Plate Light 3, 4 Low Beam Headlight I, II, IV Parking/Position Taillight 5 Brake Light I, III The following tests are performed and status indicated with the AD22001: Test Description I Hot Lamp Test: Lamp is functional. Test performed while lamp is switched on. II Cold Lamp Test: Lamp is functional. Test performed while lamp is switched off. III Fuse is in place and functional. IV The two monitored light bulbs are powered simulta- neously. This 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 INPUTS AND SUPPLY OUTPUTS +V S IN FUSE 1 & 2 IN FUSE 5 R S R S R S R S V OUTPS R S Figure 3. AD22001 Connection Diagram Thus, 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 Test In addition to the standard hot lamp test, four of the compara- tors have a cold lamp test current of about 60 µA 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 µA each. Description of Channel 5 The 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. The comparator is combined with a fuse test circuit which checks for battery voltage at its input. This input normally connects between the fuse and brake-light switch. The 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. The 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 |
유사한 부품 번호 - AD22001 |
|
유사한 설명 - AD22001 |
|
|
링크 URL |
개인정보취급방침 |
ALLDATASHEET.CO.KR |
ALLDATASHEET 가 귀하에 도움이 되셨나요? [ DONATE ] |
Alldatasheet는? | 광고문의 | 운영자에게 연락하기 | 개인정보취급방침 | 링크교환 | 제조사별 검색 All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |