LM8261 datasheet(21/29 Pages) TI

21 / 29 page

LM8261

www.ti.com

SNOS469I – APRIL 2000 – REVISED MARCH 2013

The table entries are normalized to VS

2/ R

L. To figure out the AC load current component of power dissipation,

simply multiply the table entry corresponding to the output waveform by the factor VS

2/ R

L. For example, with

±15V supplies, a 600

Ω load, and triangular waveform power dissipation in the output stage is calculated as:

PAC= (46.9 x 10

−3) · [302/600]= 70.4mW

Other Application Hints

The use of supply decoupling is mandatory in most applications. As with most relatively high speed/high output

current Op Amps, best results are achieved when each supply line is decoupled with two capacitors; a small

value ceramic capacitor (

∼0.01µF) placed very close to the supply lead in addition to a large value Tantalum or

Aluminum (> 4.7µF). The large capacitor can be shared by more than one device if necessary. The small

ceramic capacitor maintains low supply impedance at high frequencies while the large capacitor will act as the

charge "bucket" for fast load current spikes at the Op Amp output. The combination of these capacitors will

provide supply decoupling and will help keep the Op Amp oscillation free under any load.

LM8261 ADVANTAGES

Compared to other Rail-to-Rail Input/Output devices, the LM8261 offers several advantages such as:

•

Improved cross over distortion.

•

Nearly constant supply current throughout the output voltage swing range and close to either rail.

•

Consistent stability performance for all input/output voltage and current conditions.

•

Nearly constant Unity gain frequency (fu) and Phase Margin (Phim) for all operating supplies and load

conditions.

•

No output phase reversal under input overload condition.

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LM8261 Datasheet(PDF) 21 Page - Texas Instruments