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LM48520TL Datasheet(PDF) 14 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LM48520TL
Description  Boosted Stereo Class D Audio Power Amplifier with Output Speaker Protection and Spread Spectrum
PDF  18 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM48520TL Datasheet(HTML) 14 Page - National Semiconductor (TI)

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Output Speaker Protection Function
The LM48520’s output voltage limiter can be used to set a
minimum and maximum output voltage swing magnitude. The
voltage applied to the VLimit pin controls the limit on the out-
put voltage level. The output level is determined by the fol-
lowing equation:
Vout clipped = 8/3 * (PV1 — 2 * Vlimit)
or
Vout clipped = 1/2 * (PV1 — 3/8 * Vout clipped)
Where, Vout clipped = the desired output level measured in
Vpk, PV1 = Boost output voltage, and Vlimit is the voltage
applied the the Vlimit pin on the LM48520.
To disable the limiter, set Vlimit = 0V.
Figure 2 provides an example of how the output voltage limiter
functions with V
DD = 3.3V, AV = 6dB, PV1 = 5V, Vlimit = 2V,
R
L = 8Ω, VIN = 2VP.
20198729
FIGURE 2. Soft Clipping vs No Clipping
www.national.com
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