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TA0102A Arkusz danych(PDF) 9 Page - Tripath Technology Inc. |
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TA0102A Arkusz danych(HTML) 9 Page - Tripath Technology Inc. |
9 / 12 page Tripath Technology, Inc. - Technical Information 9 TA0102A, Rev. 3.1/06.01 Functional Description TA0102A Amplifier Operation Figure 3 is a simplified diagram of one channel (channel 1) of a TA0102A amplifier to assist in understanding its operation. Figure 3. Simplified TA0102A Amplifier The audio input signal (IN1) is fed into the processor internal to the TA0102A, where a modulation pattern is generated. This pattern is spread spectrum and varies between approximately 200kHz and 1.5MHz. Complementary copies of the switching pattern are level-shifted by the MOSFET drivers and output from the TA0102A where they drive the gates (HO1 and LO1) of external power MOSFETs that are connected as a half bridge. The output of the half bridge is a power-amplified version of the switching pattern that switches between VSPOS and VSNEG. This signal is then low-pass filtered to obtain amplified audio. Processing & Modulation TA0102A MUTE OVERLOADB IN1 P Gnd A Gnd OCS1H- HO1 HO1COM OCS1L+ OCR1 FDBKN1 VN12 R S V SPOS M R OCR1 BBM0 BBM1 R L 6 4 11 7 8 128 18 OCS1H+ 15 16 22 OCS1L- 14 17 20 21 9 GNDKELVIN1 HMUTE V SNEG V SPOS 19 23 24 2 R G M R G R S V SNEG LO1 35 Low-pass Filter Over-current Detection Over-current Detection 13 LO1COM Over/Under Voltage V BOOT V5 3 R IN C IN |
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