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LM4865MM Datasheet(PDF) 5 Page - National Semiconductor (TI) |
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LM4865MM Datasheet(HTML) 5 Page - National Semiconductor (TI) |
5 / 9 page Typical Performance Characteristics (Continued) Application Information BRIDGE CONFIGURATION EXPLANATION As shown in Figure 1 , the LM4865 has two operational am- plifiers internally, allowing for a few different amplifier con- figurations. The first amplifier’s gain is DC voltage controlled, while the second amplifier is internally fixed in a unity-gain, inverting configuration. The closed-loop gain of the first am- plifier is set by an external DC voltage (refer to ( Figure 1), while the second amplifier’s gain is fixed by the two internal 20 k Ω resistors. Figure 1 shows that the output of amplifier one serves as the input to amplifier two which results in both amplifiers produc- ing signals identical in magnitude, but out of phase 180˚. By driving the load differentially through outputs V O1 and V O2, an amplifier configuration commonly referred to as “bridged mode” is established. Bridged mode operation is different from the classical single-ended amplifier configura- tion where one side of its load is connected to ground. A bridge amplifier design has a few distinct advantages over the single-ended configuration, as it provides differential drive to the load, thus doubling output swing for a specified supply voltage. Four times the output power is possible as compared to a single-ended amplifier under the same condi- tions. This increase in attainable output assumes that the amplifier is not current limited or clipped. In order to choose an amplifier’s closed-loop gain without causing excessive clipping, please refer to the Audio Power Amplifier Design section. THD+N vs Output Power DS101025-23 THD+N vs Output Power DS101025-24 THD+N vs Output Power DS101025-28 Output Power vs Load Resistance DS101025-29 Clipping Voltage vs Supply Voltage DS101025-30 Output Power vs Supply Voltage DS101025-31 Output Power vs Supply Voltage DS101025-32 Supply Current vs Supply Voltage DS101025-33 www.national.com 5 |
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