LM3875T National Semiconductor, LM3875T Datasheet - Page 18
![IC AMP AUDIO PWR 56W AB TO220-11](/photos/7/0/70011/14-to-220-11_nonisolated_staggered_and_bent_sml.jpg)
LM3875T
Manufacturer Part Number
LM3875T
Description
IC AMP AUDIO PWR 56W AB TO220-11
Manufacturer
National Semiconductor
Series
Overture™r
Type
Class ABr
Datasheet
1.LM3875TFNOPB.pdf
(20 pages)
Specifications of LM3875T
Output Type
1-Channel (Mono)
Max Output Power X Channels @ Load
56W x 1 @ 8 Ohm
Voltage - Supply
20 V ~ 84 V, ±10 V ~ 42 V
Features
Short-Circuit and Thermal Protection
Mounting Type
Through Hole
Package / Case
TO-220-11 (Bent and Staggered Leads)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
*LM3875T
*LM3875T/NOPB
LM3875T/NOPB
*LM3875T/NOPB
LM3875T/NOPB
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LM3875T
Manufacturer:
NS/国半
Quantity:
20 000
Company:
Part Number:
LM3875TF/NOPB
Manufacturer:
ABB
Quantity:
12
www.national.com
Definition of Terms
is also an excellent equation to determine the 3 dB point of a
closed-loop gain, assuming that you know the GBWP of the
device. Refer to the diagram below.
Bi-amplification: The technique of splitting the audio fre-
quency spectrum into two sections and using individual
power amplifiers to drive a separate woofer and tweeter.
Crossover frequencies for the amplifiers usually vary be-
tween 500 Hz and 1600 Hz. “Biamping” has the advantages
of allowing smaller power amps to produce a given sound
pressure level and reducing distortion effects produced by
overdrive in one part of the frequency spectrum affecting the
other part.
C.C.I.R./A.R.M.:
Literally: International
Average Responding Meter
Radio
Consultative
(Continued)
Committee
FIGURE 3.
18
This refers to a weighted noise measurement for a Dolby B
type noise reduction system. A filter characteristic is used
that gives a closer correlation of the measurement with the
subjective annoyance of noise to the ear. Measurements
made with this filter cannot necessarily be related to un-
weighted noise measurements by some fixed conversion
factor since the answers obtained will depend on the spec-
trum of the noise source.
S.P.L.: Sound Pressure Level — usually measured with a
microphone/meter combination calibrated to a pressure level
of 0.0002 µBars (approximately the threshold hearing level).
Where P is the R.M.S sound pressure in microbars. (1 Bar =
1 atmosphere = 14.5 lb./in
S.P.L. = 20 Log 10P/0.0002 dB
01144914
2
= 194 dB S.P.L.).