OPA2354-Q1 Datasheet, PDF (11/23 Pages) Texas Instruments – 250 MHz, RAIL-TO-RAIL I/O, CMOS OPERATIONAL AMPLIFIERS

OPA354-Q1
OPA2354-Q1
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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.
R₁
10kΩ
R₃
V_IN ^10kΩ
+
−
1V In = 100mA
Out, as Shown
C₁
50pF
R₂
1kΩ
1µF
V+
OPA354
V−
R₄
1kΩ
+
V₁
− ^5V
R_SHUNT
1Ω
Laser Diode
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.
R₂
10kΩ
C₁
200pF
R₁
100kΩ
+5V
1µF
R₅
1Ω
OPA2354
R₃
100kΩ
+
−
2V In = 200mA
R₆
Out, as Shown
1Ω
OPA2354
R_SHUNT
1Ω
R₄
10kΩ
Laser Diode
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.
Copyright © 2009, Texas Instruments Incorporated
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