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TS4871IDT Datasheet(PDF) 23 Page - STMicroelectronics |
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TS4871IDT Datasheet(HTML) 23 Page - STMicroelectronics |
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23 / 28 page  TS4871 23/28 which gives 16Hz. In Higher frequency we want 20kHz (-3dB cut off frequency). The Gain Bandwidth Product of the TS4871 is 2MHz typical and doesn’t change when the amplifier delivers power into the load. The first amplifier has a gain of: and the theoretical value of the -3dB cut-off higher frequency is 2MHz/3 = 660kHz. We can keep this value or limit the bandwidth by adding a capacitor Cfeed, in parallel on Rfeed. Then: So, we could use for Cfeed a 220pF capacitor value that gives 24kHz. Now, we can calculate the value of Cb with the formula τb = 50kΩxCb >> τin = (Rin+Rfeed)xCin which permits to reduce the pop and click effects. Then Cb >> 0.8µF. We can choose for Cb a normalized value of 2.2µF that gives good results in THD+N and PSRR. In the following tables, you could find three another examples with values required for the demoboard. Remark : components with (*) marking are optional. Application n°1 : 20Hz to 20kHz bandwidth and 6dB gain BTL power amplifier. Components : Application n°2 : 20Hz to 20kHz bandwidth and 20dB gain BTL power amplifier. Components : CIN = 1 2 π RinFCL ------------------------------ = 795nF Rfee d Rin ----------------- = 3 C FEED = 1 2 π RFEEDFCH --------------------------------------- = 265pF Designator Part Type R1 22k / 0.125W R4 22k / 0.125W R6 Short Cicuit R7 330k / 0.125W R8* (Vcc-Vf_led)/If_led C5 470nF C6 100µF C7 100nF C9 Short Circuit C10 Short Circuit C12 1µF S1, S2, S6, S7 2mm insulated Plug 10.16mm pitch S8 3 pts connector 2.54mm pitch P1 PCB Phono Jack D1* Led 3mm U1 TS4871ID or TS4871IS Designator Part Type R1 110k / 0.125W R4 22k / 0.125W R6 Short Cicuit R7 330k / 0.125W R8* (Vcc-Vf_led)/If_led C5 470nF C6 100µF C7 100nF |
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