Datasheet

PWM
VDD
VDD
0
IN −
IN +
0
H/C
VDD
0
1 µF
AVDD
AGND (Connect to PowerPAD)
ROSC
COSC
AREF
IN+
IN−IN−
FAULT1 FAULT0 PVDD PVDD PVDD H/C H/C H/C
H/C
PGND
PGND
PGND
PGND
PGND
PGND
PWM
PWM PWM PWM
PVDD PVDD PVDD FREQ
120 kΩ
220 pF
1 µF
Shutdown Control
1 kΩ
1 kΩ
DC Control
Voltage
10 µF
V
DD
10 µH
1 µF
FAULT1
FAULT0
To TEC or Laser
Diode Anode
To TEC or Laser
Diode Cathode
1 µF
SHUTDOWN
INT/EXT
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
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Product Folder Link(s): DRV593 DRV594