PWM

VDD

VDD

0

IN −

IN +

0

H/C

VDD

0

1

µF

AVDD

AGND (Connect to PowerPAD)

ROSC

COSC

AREF

IN+

IN−

IN−

H/C

PGND

PGND

PGND

PGND

PGND

PGND

PWM

120 k

Ω

220 pF

1

µF

Shutdown Control

1 k

Ω

1 k

Ω

DC Control

Voltage

10

µF

VDD

10

µH

1

µF

FAULT1

FAULT0

To TEC or Laser

Diode Anode

To TEC or Laser

Diode Cathode

1

µF

SHUTDOWN

DRV593

DRV594

10

µF

DRV593

DRV594

www.ti.com

SLOS401C – OCTOBER 2002 – REVISED JULY 2010

To avoid this phenomenon, hysteresis should be implemented in the control loop to prevent the device from

operating within this region. Although planning for operation during the zero-crossing is important, the normal

operating points for the DRV593 and DRV594 are outside of this region. For laser temperature/wavelength

regulation, the zero volts output condition is only a concern when the laser temperature or wavelength, relative to

the ambient temperature, requires no heating or cooling from the TEC element.

Figure 20. Transition From Cooling to Heating

Figure 21. Typical Application Circuit

Copyright © 2002–2010, Texas Instruments Incorporated

Submit Documentation Feedback

13

Product Folder Link(s): DRV593 DRV594