ixld02 IXYS Corporation, ixld02 Datasheet - Page 6

• Manufacturer Part Number: ixld02
• Description: Ixld02si Differential 2a Ultra Fast Laser Diode Driver
• Manufacturer: IXYS Corporation

Figure 4 - Duty Cycle
Figure 4 illustrates the Duty Cycle (DC), FIN and PDN relation ships. The PDN command must be in a TTL “High”
state 30ns prior to the first FIN pulse. It must stay in this state for the duration of the laser light burst, T1 to T2.
The Duty cycle is defined as:
Power in the IC is:
Figure 5 - IPW And IOP Modulation
Figure 5 illustrates the simultaneous modulation of both the IPW control current and the IOP control current. The FIN
frequency in this figure is held constant. At T0 the IPW and the IOP signals are near zero, both begin to ramp up at
T1 and reach their maximums at T2. As illustrated, the output current rises in amplitude with the increasing IOP and
the pulse width widens with the IPW ramp.
An additional mode of modulation can be added to the two above by also modulating the frequency of the FIN signal.
This will allow three mode of simultaneous modulation. The three modes do not have to be used together; each is
fully independent. The obvious caveat is that the pulse width must be consistent with the chosen frequency. This
agility provides the designer with a broad range of design choices.
Directed Energy, Inc.
An IXYS Company
2401 Research Blvd. Ste. 108
Ft. Collins, CO 80526
Tel: [phone]; Fax: [phone]
e-mail: [e-mail]
www.directedenergy.com
DC
Total dc Power X DC
T
T
2
3
T
T
1
1
6
Doc #9200-0258 Rev 2
IXLD02SI