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TA2131FLG Datasheet(PDF) 8 Page - Toshiba Semiconductor |
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TA2131FLG Datasheet(HTML) 8 Page - Toshiba Semiconductor |
8 / 21 page TA2131FLG 2006-04-19 8 2. Low-Pass Compensation 2-1. Function In C-couple type power amplifiers, it is necessary to give the output condenser C a large capacity to flatten out the frequency characteristics to the low frequency band (this is because the loss in the low frequency bandwidth becomes larger due to the effect of the high-pass filter comprising C and RL). Particularly when the headphone load is approximately 16 Ω and an attempt is being made to achieve frequency characteristics of ±3 dB at 20 Hz, a large capacity condenser of C = 470 µF is required. Bearing this situation in mind, a low-pass compensation function was built in to the TA2131FLG, and while reducing the capacity of the output coupling condenser, almost flat ( ±3 dB) frequency characteristics in all audible bandwidths (20 Hz to 20 kHz) have been achieved. Fig.3 shows the low-pass system diagram, and Fig.4 shows the frequency characteristics at each point. In Fig.4, (a) represents the status lost by the low-pass as a result of the high-pass filter comprising the headphone load (RL = 16 Ω) and the output coupling condenser (220 µF) in the C-coupling system. DAC OUT 22 21 2 Vref ADD Vref INA BST2 PWA PWB 8 4 RL INB OUTB BST NF2 OUTA 10 k Ω 10 k Ω 15 kΩ 10 k Ω 15 kΩ 10 k Ω 10 k Ω 20 k Ω 16 Ω 220 µF 220 µF V (OUT) RL 16 Ω 20 k Ω 20 k Ω 1 µF 10 µF 10 µF V (RL) Figure 3 Low-Pass Compensation System Diagram f (Hz) 1 10 100 1 k 10 k 100 k −60 40 20 0 −20 −40 V (OUT) V (BST OUT) V (LPF1) V (NF1) V (RL) V (LPF2) V (NF2) Figure 2 During Bass Boost (Frequency Characteristics to Each Terminal) |
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