DRV593_15 Datasheet, PDF (13/27 Pages) Texas Instruments – 3−A HIGH−EFFICIENCY PWM POWER DRIVER

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DRV593
DRV594
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.
VDD
IN +
IN −
0
VDD
PWM
0
VDD
H/C
0
Figure 20. Transition From Cooling to Heating
V_DD
10 µF
1 µF
1 µF
120 kΩ
DC Control
Voltage
1 kΩ
220 pF
1 µF
1 kΩ _{Shutdown Control}
AVDD
AGND (Connect to PowerPAD)
ROSC
COSC
AREF
IN+
DRV593
DRV594
IN−
SHUTDOWN
PWM
PGND
PGND
PGND
PGND
PGND
PGND
H/C
10 µH
To TEC or Laser
Diode Anode
10 µF
FAULT1
FAULT0
1 µF
Figure 21. Typical Application Circuit
To TEC or Laser
Diode Cathode
Copyright © 2002–2010, Texas Instruments Incorporated
Product Folder Link(s): DRV593 DRV594
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