LT1185 datasheet(13/16 Pages) LINER

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LT1185

TYPICAL APPLICATIO S

Time Delayed Start-Up

Low Input Voltage Monitor Tracks Dropout Characteristics

R6**

–

2.37k

2.6k

27k

2.2

µF

TANT

VOUT

–

OPTIONAL HYSTERSIS

≈2M

LT1006

†

V–

V+

“LOW” FOR LOW INPUT

OUTPUT SWINGS FROM VIN

+ TO V

–

360k

R4**

R5*

0.01

Ω

2.2

µF

TANT

REF

GND

VOUT

LT1185

VIN

–

VIN

*3" #26 WIRE

**R4 DETERMINES TRIP POINT AT IOUT = 0

R6 DETERMINES INCREASE OF TRIP POINT AS IOUT INCREASES

TRIP POINT FOR VIN = VOUT

()

1 + R4 • R7

R3 • R6

+ IOUT

R5 • R7

FOR VALUES SHOWN, TRIP POINT FOR VIN IS:

VOUT + 0.37V AT IOUT = 0 AND VOUT = 1.18V AT IOUT = 3A

†DO NOT SUBSTITUTE. OP AMP MUST HAVE COMMON MODE

RANGE EQUAL TO NEGATIVE SUPPLY

LT1185 • TA05

–

REF

GND

VOUT

LT1185

VIN

RLIM***

R3**

15k

C3*

†

2.2

µF

VIN

2.37k

2.2

µF

TANT

–

VOUT

LT1185 • TA06

ALL DIODES 1N4148

*SEE CHART FOR DELAY TIME VERSUS (C3)(R3//RLIM) PRODUCT

**FOR LONG DELAY TIMES, REPLACE D2 WITH 2N3906 TRANSISTOR AND USE R3 ONLY FOR

CALCULATING DELAY TIME. R3 CAN INCREASE TO 100k

***ILIM IS ≈11k/RLIM, INSTEAD OF 15k, BECAUSE OF VOLTAGE DROP IN D1. TEMPERATURE

COEFFICIENT OF ILIM 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)

1.5

2.0

2.5

LT1185 • TA07

1.0

0.5

510

3.0

3.5

4.0

*t = (R3//RLIM)(C3) =

()

R3 • RLIM

R3 + RLIM

(C3)

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