lm4701 National Semiconductor Corporation, lm4701 Datasheet
lm4701
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lm4701 Summary of contents
Page 1
... Audio Power Amplifier with Mute and Standby Modes General Description The LM4701 is an audio power amplifier capable of deliver- ing typically 30W of continuous average output power into an 8 load with less than 0.1% (THD + N). The LM4701 has an independent smooth transition fade-in/ out mute and a power conserving standby mode which can be controlled by external logic ...
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... 150˚C 1.8˚C/W 43˚C/W 260˚C −40˚ +150˚C (Notes 4, 5) −20˚C T +85˚C MAX (Note 1) 20V to 64V CC EE LM4701 Units (Limits) Typical Limit (Note 9) (Note 10 (min (max W/ch (min W/ch (min) 0. V/µ ...
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... LM4701 can deliver typically 22 Watts of continuous average power per channel with less than 0.1% (THD+N). ± With supplies above 20V, the LM4701 cannot deliver more than 22 watts into 4 due to current limiting of the output transistors. Thus, increasing the power supply ± above 20V will only increase the internal power dissipation, not the possible output power ...
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Test Circuit # 1 (Note 2) (DC Electrical Test Circuit) Test Circuit # 2 (Note 3) (AC Electrical Test Circuit) Bridged Amplifier Application Circuit FIGURE 2. Bridged Amplifier Application Circuit www.national.com DS100835-3 DS100835-4 DS100835-5 4 ...
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Single Supply Application Circuit FIGURE 3. Single Supply Amplifier Application Circuit Auxillary Amplifier Application Circuit FIGURE 4. Auxillary Amplifier Application Circuit DS100835-6 DS100835-7 5 www.national.com ...
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Equivalent Schematic (Excluding Active Protection Circuitry) www.national.com 6 DS100835-8 ...
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External Components Description Components 1 R Prevents currents from entering the amplifier’s non-inverting input which may be passed through to the B load upon power down of the system due to the low input impedance of the circuitry when the ...
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Typical Performance Characteristics THD + N vs Frequency DS100835-10 THD + N vs Output Power DS100835-13 THD + N vs Output Power DS100835-16 Clipping Voltage vs Supply Voltage DS100835-19 www.national.com THD + N vs Frequency DS100835-11 THD + N vs ...
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Typical Performance Characteristics Power Dissipation vs Output Power DS100835-22 Output Power vs Load Resistance DS100835-25 Pulse Response DS100835-28 (Continued) Power Dissipation vs Ouput Power DS100835-23 Output Power vs Supply Voltage DS100835-26 Large Signal Response DS100835-29 9 Power Dissipation vs Output ...
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Typical Performance Characteristics Power Supply Rejection Ratio DS100835-31 Safe Area DS100835-34 Pulse Thermal Resistance DS100835-37 www.national.com (Continued) Common-Mode Rejection Ratio DS100835-32 Spike Protection Response DS100835-35 Pulse Thermal Resistance DS100835-38 10 Open Loop Frequency Response DS100835-33 Supply Current vs Supply Voltage ...
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... Characteristics section for curves concerning Mute Attenu- ation vs Mute Pin Voltage. STANDBY MODE The standby mode of the LM4701 allows the user to drasti- cally reduce power consumption when the amplifier is idle. By placing a logic-high voltage on the standby pin, the ampli- fier will go into Standby Mode. In this mode, the current drawn from the V supply is typically less than 10 µ ...
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... SINGLE-SUPPLY AMPLIFIER APPLICATION The typical application of the LM4701 is a split supply ampli- fier. But as shown in Figure 3 , the LM4701 can also be used in a single power supply configuration. This involves using some external components to create a half-supply bias + ...
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... To achieve a transient free power-up and power-down, the voltage seen at the input terminals should be ideally the same. Such a signal will be common-mode in nature, and will be rejected by the LM4701. In Figure 3 , the resistor R serves to keep the inputs at the same potential by limiting the voltage difference possible between the two nodes. This should significantly reduce any type of turn-on pop, due to an uneven charging of the amplifier inputs ...
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... GBWP of 2.1 MHz is H less than the minimum GBWP of 5 MHz for the LM4701. This will ensure that the high frequency response of the amplifier in will be no worse than 0.17 dB down at 20 kHz which is well I within the bandwidth requirements of the design ...
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... National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. For Staggered Lead Non-Isolated Package Only a 9-Pin Package Order Number LM4701T NS Package Number TA9A 2. A critical component is any component of a life ...