LTC1531CSW View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LTC1531CSW

Self-Powered Isolated Comparator

Linear Technology 

LTC1531

TYPICAL APPLICATIONS

AC

120V

TECCOR

Q4008L4

OR EQUIVALENT

NEUTRAL

LOAD

25Ω

150Ω

1k

2N2222

1N4004

3k

3W

750Ω

0.5W

DANGER!

LETHAL VOLTAGES

IN THIS SECTION!

+

20µF

50V

R1

680k

R2

C1

47k

0.01µF

VCC

ZCDATA

SHDN

ZCPOS ZCNEG

5.6V

+

DATA

100µF

VALID

QD

GND

LTC1531

ISOLATION

BARRIER

TRIAC FIRING:

θ = DESIRED PHASE LAG

R2 • C1 = Tan(θ)/(2π60Hz)

R2/(R1 + R2) = ATTENUATION

+

VPW

2.5V VREG

V1

2.2µF

1

CADMIUM

LIGHT

SENSOR

100k

V2

+

V3

–

V4

1

CMPOUT

ISOGND

HYSTERESIS

560k

100k

1

1 = ISOLATED GROUND

1 1531 F07

Figure 7. Remote Light-Controlled Switch

AC

120V

LOAD

25Ω

TECCOR

Q4008L4

OR EQUIVALENT

NEUTRAL

150Ω

+

10µF

50V

1k

2N2222

DANGER!

LETHAL VOLTAGES

IN THIS SECTION!

470Ω

2W

1µF

275V

R1

680k

1N4004

R2

C1

47k

0.01µF

390Ω

LED

VCC

ZCDATA

SHDN

ZCPOS ZCNEG

5.6V

+

100µF

DATA

QD

VALID

GND

LTC1531

ISOLATION

BARRIER

VPW

TRIAC FIRING:

θ = DESIRED PHASE LAG

R2 • C1 = Tan(θ)/(2π60Hz)

R2/(R1 + R2) = ATTENUATION

+

1µF

2.5V VREG

V1

1

1M

V2

+

V3

–

V4

CMPOUT

LOW

VOLTAGE

SWITCH

ISOGND

1

1

1531 F08

1

1 = ISOLATED GROUND

Figure 8. Isolated Switch Control

10

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