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參數(shù)資料
| 型號： | 522979E |
| 英文描述： | Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits |
| 中文描述： | 集成電路 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 292K |
| 代理商： | 522979E |
13
LT1185
TYPICAL APPLICATIO U
Time Delayed Start-Up
Low Input Voltage Monitor Tracks Dropout Characteristics
R6**
1k
+
+
–
4k
R1
2.37k
R2
2.6k
R7
27k
+
C1
2.2
μ
F
TANT
V
OUT
–
+
LT1006
V
–
OPTIONAL HYSTERSIS
≈
2M
V
+
3
2
4
7
“LOW” FOR LOW INPUT
OUTPUT SWINGS FROM V
IN+
TO V
IN–
R3
360k
R4**
1k
R5*
0.01
C2
2.2
μ
F
TANT
REF
GND
FB
V
OUT
LT1185
V
IN
+
–
V
IN
*3" #26 WIRE
**R4 DETERMINES TRIP POINT AT I
OUT
= 0.
R6 DETERMINES INCREASE OF TRIP POINT AS I
OUT
INCREASES.
TRIP POINT FOR V
IN
= V
OUT
FOR VALUES SHOWN, TRIP POINT FOR V
IS:
V
OUT
+ 0.37V AT I
OUT
= 0 AND V
OUT
= 1.18V AT I
OUT
= 3A
DO NOT SUBSTITUTE. OP AMP MUST HAVE COMMON-MODE
RANGE EQUAL TO NEGATIVE SUPPLY.
1 +R3
×
R7
×
R6
+ I
OUT
R5
×
R7
R6
LT1185 TA05
+
–
REF
GND
FB
V
OUT
LT1185
V
IN
R
LIM
***
D1
D2
R3**
15k
C3*
D3
C2
2.2
μ
F
V
IN
+
R2
R1
2.37k
C1
2.2
μ
F
TANT
+
+
–
V
OUT
LT1185 TA06
ALL DIODES 1N4148
*SEE CHART FOR DELAY TIME VERSUS (C3)(R3//R
LIM
) PRODUCT.
**FOR LONG DELAY TIMES, REPLACE D2 WITH 2N3906 TRANSISTOR AND USE R3 ONLY FOR
CALCULATING DELAY TIME. R3 CAN INCREASE TO 100k.
***I
LIM
IS
≈
11k/R
LIM
, INSTEAD OF 15k, BECAUSE OF VOLTAGE DROP IN D1. TEMPERATURE
COEFFICIENT OF I
WILL BE
≈
0.11%/°C, SO ADEQUATE MARGIN MUST BE ALLOWED
FOR COLD OPERATION.
D3 PROVIDES FAST RESET OF TIMING. INPUT MUST DROP TO A LOW VALUE TO RESET TIMING.
Q1**
Delay Time
INPUT VOLTAGE (V)
0
T
1.5
2.0
2.5
15
25
LT1185 TA07
1.0
0.5
0
5
10
20
3.0
3.5
4.0
30
*t = (R3//R
LIM
)(C3) =
(
)
R3
×
R
LIM
R3 + R
LIM
(C3)
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|---|---|
| 522980H | IC |
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| 522980H | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:IC |
| 522981F | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:IC |
| 522982D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:IC-OFFLINE SWITCHING REGULATOR |
| 522983B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:IC |
| 522984X | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:IC |
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