Datasheet

LM8272
www.ti.com SNOS515D –OCTOBER 2000–REVISED MARCH 2013
The table entries are normalized to V
S
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 V
S
2
/R
L
. For example, with
±12V supplies, a 600Ω load, and triangular waveform power dissipation in the output stage is calculated as:
P
AC
= (46.9 × 10
−3
) · [24
2
/600] = 45.0mW
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.
LM8272 ADVANTAGES:
Compared to other Rail-to-Rail Input/Output devices, the LM8272 offers several advantages such as:
• Improved cross over distortion
• Nearly constant supply current throughout the output voltage swing range and close to either rail.
• Nearly constant Unity gain frequency (f
u
) and Phase Margin (Phi
m
) for all operating supplies and load
conditions.
• No output phase reversal under input overload condition.
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