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TFA9810TN1 Datasheet(PDF) 5 Page - NXP Semiconductors |
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TFA9810TN1 Datasheet(HTML) 5 Page - NXP Semiconductors |
5 / 29 page TFA9810_3 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 03 — 20 February 2008 5 of 29 NXP Semiconductors TFA9810 Audio amplifier 2 x 12 W 8. Functional description 8.1 General The TFA9810 is a dual-switching power comparator. It is the main building block for a stereo high-efficiency Class D audio power amplifier system. It contains two full-bridge BTL power stages, drive logic, protection-control logic and full differential input comparators and references (see Figure 1). By using this power comparator a compact closed-loop self-oscillating digital amplifier system or open-loop system can be built. A second-order low-pass filter converts the Pulse Width Modulation (PWM) output signal into an analog audio signal across the speaker. 8.2 Interfacing The pins ENABLE and SO/OL control the operating mode of the TFA9810. Both the ENABLE and the SO/OL pins refer to VSSD(HW). When the SO/OL pin is connected to VSSA the TFA9810 is in self-oscillating mode: when the SO/OL pin is floating the TFA9810 is in open-loop mode. The TEST pin needs to be connected to VDDA in both situations. The device has two modes: SLEEP and OPERATING. IN2N 14 Negative input comparator channel 2 IN2P 15 Positive input comparator channel 2 STAB2 18 Decoupling of internal 11 V regulator for channel 2 drivers VSSP2 19 Negative power-supply voltage channel 2 BOOT2N 20 Bootstrap high-side driver negative output channel 2 OUT2N 21 Negative output channel 2 BOOT2P 22 Bootstrap high-side driver positive output channel 2 OUT2P 23 Positive output channel 2 VDDP2 24 Positive supply voltage power channel 2 VDDP1 25 Positive power supply voltage channel 1 OUT1P 26 Positive output channel 1 BOOT1P 27 Bootstrap high-side driver positive output channel 1 OUT1N 28 Negative output channel 1 BOOT1N 29 Bootstrap high-side driver negative output channel 1 VSSP1 30 Negative supply voltage power channel 1 STAB1 31 Decoupling of internal 11 V regulator for channel 1 drivers Table 3. Pin description …continued Symbol Pin Description Table 4. SO/OL connections Interfacing SO/OL connected to Configuration VSSD(HW) Self-oscillating Open Open-loop |
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