LM48520TL/NOPB National Semiconductor, LM48520TL/NOPB Datasheet - Page 14

• Manufacturer Part Number: LM48520TL/NOPB
• Description: IC AMP AUDIO PWR 1.3W D 25USMD
• Manufacturer: National Semiconductor
• Series: Boomer®r
• Type: Class Dr

Specifications of LM48520TL/NOPB

• Output Type: 2-Channel (Stereo)
• Max Output Power X Channels @ Load: 1.3W x 2 @ 8 Ohm
• Voltage - Supply: 2.4 V ~ 5.5 V
• Features: Depop, Differential Inputs, Short-Circuit Protection, Shutdown
• Mounting Type: Surface Mount
• Package / Case: 25-MicroSMD
• Operational Class: Class-D
• Audio Amplifier Output Configuration: 2-Channel Stereo
• Output Power (typ): 1.3x2@8OhmW
• Audio Amplifier Function: Speaker
• Total Harmonic Distortion: 0.04@8Ohm@500mW%
• Single Supply Voltage (typ): Not RequiredV
• Dual Supply Voltage (typ): 3/5V
• Power Supply Requirement: Triple
• Rail/rail I/o Type: No
• Power Supply Rejection Ratio: 82dB
• Single Supply Voltage (min): Not RequiredV
• Single Supply Voltage (max): Not RequiredV
• Dual Supply Voltage (min): 2.4/2.7/3V
• Dual Supply Voltage (max): 5/5.5V
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 25
• For Use With: LM48520TLBD - BOARD EVALUATION FOR LM48520TL
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM48520TL; LM48520TL; LM48520TLTR

www.national.com
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:
or
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
R
L
= 8Ω, V
Vout clipped = 1/2 * (PV1 — 3/8 * Vout clipped)
Vout clipped = 8/3 * (PV1 — 2 * Vlimit)
IN
= 2V
DD
P
= 3.3V, A
.
V
= 6dB, PV1 = 5V, Vlimit = 2V,
14
FIGURE 2. Soft Clipping vs No Clipping
20198729