Inverted

Output

Light

Drive

Ckt.

Drive

Ckt.

Light

Output

R

Light

D

Output

RL

Light

Output

Inverted

RL

D

R

D

R

RL

RD

RL

D

D

I

CC

R

V

=

LED

- V

L

L

I

CC

R

V

=

CE

- V

L

R

CE

CC

=

L

I

- V

V

LED

CC

R =

D

D

I

V

- V

- VCE

VCC

CC

V

CC

V

CC

V

EE

V

(GND)

EE

V

(GND)

EE

V

(GND)

EE

V

(GND)

I

L

L

R

- V

V

= CC

CE

ID

D

- V

R

V

= CC

LED

L

R

I

=

L

- V

CC

V

CE

- V

I

D=

R

D

CC

V

- VLED CE

Pulsed - Driver Circuits for LED & Phototransistor

DC—Drive Circuit for LED & Phototransistor

Pulsed—Drive Circuit for LED & Phototransistor

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

Distance (inches)

Normalized at 1.00 inches