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TDA2005S Fiches technique(PDF) 6 Page - STMicroelectronics |
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TDA2005S Fiches technique(HTML) 6 Page - STMicroelectronics |
6 / 20 page Voltage and current swings are twice for a bridge amplifier in comparison with single ended amplifier. In order words, with the same RL the bridge con- figuration can deliver an output power that is four times the output power of a single ended amplifier, while, with the same max output current the bridge configuration can deliver an output power that is twice the output power of a single ended amplifier. Core must be taken when selecting VS and RL in order to avoid an output peak current above the absolute maximum rating. From the expression for IOmax, assuming VS = 14.4V and VCE sat = 2V, the minimum load that can be driven by TDA2005 in bridge configuration is : RL min = VS − 2VCEsat IOmax = 14.4 −4 3.5 = 2.97 Ω The voltage gain of the bridge configurationis given by (see Figure 34) : GV = V0 V1 =1 + R1 R2 ⋅ R4 R2 + R4 + R3 R4 For sufficiently high gains (40 to 50dB) it is possible to put R2 =R4 and R3 =2 R1, simplifing the formula in : GV =4 R1 R2 Gv (dB) R1 ( Ω)R2 =R4 (Ω)R3 (Ω) 40 50 1000 1000 39 12 2000 2000 Figure 6 : Bridge Configuration Figure 7 : Typical Application Circuit STEREO AMPLIFIER APPLICATION (TDA2005S) TDA2005 6/20 |
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