OPA569

SBOS264A

20

www.ti.com

FIGURE 21. Single Power Amplifier Driving Bidirectional Current through a TEC using Asymmetrical Bipolar Power Supplies.

FIGURE 19. Grounded Anode LED Driver.

APPLICATION CIRCUITS

FIGURE 20. Bridge Tied Load Driver.

Luxeon Star-0

High-Power LED

12,

13

5

3

R

SET

6

17,

18

(1)

14,

15

V

O

f

V

IN

OPA569

R

1

49.9k

Ω

R

SHUNT

1

Ω

I

O

R

2

4.99k

Ω

4.99k

Ω

0.0033

µF

R

3

49.9k

Ω

–5V

+1V

0V

0mA

–100mA

0V

–2.5V

Feedback for Constant Current,

1V Input per 100mA Output as Shown.

NOTE: (1) Bypass as recommended.

R

SET

R

M

I

I

TEC

475

V

SET

Optional to

monitor the

load current.

TEC

OPA569

1k

Ω

Heat/Cool

V

TEC

V

+

–

5

12,

13

17,

18

14,

15

Current

Limit

Set

Current

Limit

Set

17,

18

5

6

3

3

12,

13

14,

15

19

I

MONITOR

R

SET

NOTE: (1) Bypass as recommended.

5V

(1)

5V

6

1k

Ω

V

IN

OPA569

V

M

(1)

OPA569

5

12,

13

17,

18

19

–1.2V

14,

15

NOTE: Total Supply Must

be < 5.5V Cooling/Heating.

NOTE: (1) Bypass as recommended.

R

MONITOR

I

MONITOR

+3.3V

(1)

6

V

IN

TEC

I

L