LM3875T National Semiconductor, LM3875T Datasheet - Page 4

• Manufacturer Part Number: LM3875T
• Description: IC AMP AUDIO PWR 56W AB TO220-11
• Manufacturer: National Semiconductor
• Series: Overture™r
• Type: Class ABr

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

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SNR
IMD
Symbol
Electrical Characteristics
The following specifications apply for V
25˚C.
*DC Electrical Test; refer to Test Circuit #1.
**AC Electrical Test; refer to Test Circuit #2.
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which
guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit
is given, however, the typical value is a good indication of device performance.
Note 2: All voltages are measured with respect to supply GND, unless otherwise specified.
Note 3: For operating at case temperatures above 25˚C, the device must be derated based on a 150˚C maximum junction temperature and a thermal resistance
of θ
Note 4: Human body model, 100 pF discharged through a 1.5 kΩ resistor.
Note 5: The operating junction temperature maximum is 150˚C, however, the instantaneous Safe Operating Area temperature is 250˚C.
Note 6: Typicals are measured at 25˚C and represent the parametric norm.
Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 8: The LM3875T package TA11B is a non-isolated package, setting the tab of the device and the heat sink at V
to the heat sink using only thermal compound. If a mica washer is used in addition to thermal compound, θ
isolated from V
Note 9: The feedback compensation network limits the bandwidth of the closed-loop response and so the slew rate will be reduced due to the high frequency roll-off.
Without feedback compensation, the slew rate is typically 16V/µs.
Note 10: The output dropout voltage is the supply voltage minus the clipping voltage. Refer to the Clipping Voltage vs. Supply Voltage graph in the Typical
Performance Characteristics section.
Test Circuit #1
JC
= 1.0˚C/W (junction to case). Refer to the Thermal Resistance figure in the Application Information section under Thermal Considerations.
Signal-to-Noise Ratio
Intermodulation Distortion Test
−
.
Parameter
(DC Electrical Test Circuit)
+
= +35V, V
(Notes 1, 2) (Continued)
P
Measured at 1 kHz, R
P
Measured at 1 kHz, R
P
Measured at 1 kHz, R
60 Hz, 7 kHz, 4:1 (SMPTE)
60 Hz, 7 kHz, 1:1 (SMPTE)
−
O
O
pk
= −35V with R
= 1W, A-Weighted,
= 40W, A-Weighted,
= 100W, A-Weighted,
4
Conditions
L
= 8Ω unless otherwise specified. Limits apply for T
S
S
S
=25Ω
=25Ω
=25Ω
CS
(case to sink) is increased, but the heat sink will be
−
potential when the LM3875 is directly mounted
(Note 6)
Typical
114 dB
122 dB
98 dB
0.004
0.006
LM3875
01144903
(Note 7)
Limit
(Limits)
A
Units
=
dB
dB
dB
%