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LM4782 Fiches technique(PDF) 8 Page - National Semiconductor (TI) |
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LM4782 Fiches technique(HTML) 8 Page - National Semiconductor (TI) |
8 / 26 page External Components Description (Figures 1-5) Components Functional Description 1R B Prevents current from entering the amplifier’s non-inverting input. This current may pass through to the load during system power down, because of the amplifier’s low input impedance when the undervoltage circuitry is off. This phenomenon occurs when the V + and V- supply voltages are below 1.5V. 2R i Inverting input resistance. Along with R f, sets AC gain. 3R f Feedback resistance. Along with R i, sets AC gain. 4R f2 (Note 16) Feedback resistance. Works with Cf and Rf creating a lowpass filter that lowers AC gain at high frequencies. The -3dB point of the pole occurs when: (R f -Ri)/2=Rf // [1/(2 πf cCf)+Rf2] for the Non-Inverting configuration shown in Figure 5. 5C f (Note 16) Compensation capacitor. Works with R f and Rf2 to reduce AC gain at higher frequencies. 6C C (Note 16) Compensation capacitor. Reduces the gain at higher frequencies to avoid quasi-saturation oscillations of the output transistor. Also suppresses external electromagnetic switching noise created from fluorescent lamps. 7C i (Note 16) Feedback capacitor which ensures unity gain at DC. Along with R i also creates a highpass filter at fc = 1/(2 πR iCi). 8C S Provides power supply filtering and bypassing. Refer to the Supply Bypassing application section for proper placement and selection of bypass capacitors. 9R V (Note 16) Acts as a volume control by setting the input voltage level. 10 R IN (Note 16) Sets the amplifier’s input terminals DC bias point when C IN is present in the circuit. Also works with CIN to create a highpass filter at f C = 1/(2 πR INCIN). If the value of RIN is too large, oscillations may be observed on the outputs when the inputs are floating. Recommended values are 10k Ω to 47kΩ. Refer to Figure 5. 11 C IN (Note 16) Input capacitor. Prevents the input signal’s DC offsets from being passed onto the amplifier’s inputs. 12 R SN (Note 16) Works with C SN to stabilize the output stage by creating a pole that reduces high frequency instabilities. 13 C SN (Note 16) Works with R SN to stabilize the output stage by creating a pole that reduces high frequency instabilities. The pole is set at f C = 1/(2 πR SNCSN). Refer to Figure 5. 14 L (Note 16) Provides high impedance at high frequencies so that R may decouple a highly capacitive load and reduce the Q of the series resonant circuit. Also provides a low impedance at low frequencies to short out R and pass audio signals to the load. Refer to Figure 5. 15 R (Note 16) 16 R A Provides DC voltage biasing for the transistor Q1 in single supply operation. 17 C A Provides bias filtering for single supply operation. 18 R INP (Note 16) Limits the voltage difference between the amplifier’s inputs for single supply operation. Refer to the Clicks and Pops application section for a more detailed explanation of the function of R INP. 19 R BI Provides input bias current for single supply operation. Refer to the Clicks and Pops application section for a more detailed explanation of the function of R BI. 20 R E Establishes a fixed DC current for the transistor Q1 in single supply operation. This resistor stabilizes the half-supply point along with C A. 21 R M Limits the current drawn into the logic gates for the MUTE and STANDBY pins. 22 S 1 Standby switch. When switched to GND, the amplifier will be in PLAY mode. 23 S 2 Mute switch. When switched to GND, the amplifier will be in PLAY mode. 24 R OUT Reduces current flow between outputs that are caused by Gain or DC offset differences between the amplifiers. Note 16: Optional components dependent upon specific design requirements. www.national.com 8 |
Numéro de pièce similaire - LM4782 |
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Description similaire - LM4782 |
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