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TS4984 датащи(PDF) 20 Page - STMicroelectronics |
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TS4984 датащи(HTML) 20 Page - STMicroelectronics |
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20 / 29 page ![]() TS4984 Application Information 20/29 The following graph (Figure 65) shows an example of Cin and Cfeed influence. 4.4 Power dissipation and efficiency Hypotheses: l Voltage and current in the load are sinusoidal (Vout and Iout). l Supply voltage is a pure DC source (Vcc). Regarding the load we have: and and Therefore, the average current delivered by the supply voltage is: The power delivered by the supply voltage is: Figure 65: Frequency response gain versus Cin & Cfeed 10 100 1000 10000 -25 -20 -15 -10 -5 0 5 10 Rin = Rfeed = 22k Ω Tamb = 25 °C Cfeed = 2.2nF Cfeed = 680pF Cfeed = 330pF Cin = 470nF Cin = 82nF Cin = 22nF Frequency (Hz) V out = VPEAK sinωt (V) I out = V out R L -------------- (A) P out = V PE AK 2 2R L ------------------------- (W) I CC AV G = 2 V PEAK πR L ------------------- (A) P su ppl y V CC I CC AVG ⋅ = W () |
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