Datasheet

V
IN
V
1
5V
R
SHUNT
1
Ω
Laser Diode
OPA354
C
1
50pF
R
1
10k
Ω
R
3
10k
Ω
R
4
1k
Ω
R
2
1k
Ω
1
µ
F
+
−
+
−
V+
V
−
1V In = 100mA
Out, as Shown
R
SHUNT
1Ω
Laser Diode
OPA2354
C
1
200pF
R
1
100kΩ
R
6
1Ω
R
5
1Ω
R
3
100kΩ
R
4
10kΩ
R
2
10kΩ
1µF
+
−
2V In = 200mA
Out, as Shown
OPA2354
+5V
OPA354-Q1
OPA2354-Q1
www.ti.com ....................................................................................................................................................... SBOS492A –JUNE 2009–REVISED AUGUST 2009
Output Drive
The OPA354's output stage can supply a continuous output current of ±100 mA and still provide approximately
2.7-V output swing on a 5-V supply, as shown in Figure 2.
Figure 2. Laser Diode Driver
For maximum reliability, it is not recommended to run a continuous dc current in excess of ±100 mA. See the
typical characteristic curve Output Voltage Swing vs Output Current. For supplying continuous output currents
greater than ±100 mA, the OPA354 may be operated in parallel, as shown in Figure 3.
Figure 3. Parallel Operation
The OPA354 provides peak currents up to 200 mA, which corresponds to the typical short-circuit current.
Therefore, an on-chip thermal shutdown circuit is provided to protect the OPA354 from dangerously high junction
temperatures. At 160°C, the protection circuit shuts down the amplifier. Normal operation resumes when the
junction temperature cools to below 140°C.
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