Datasheet > TFA9878BUK/N1

TFA9878BUK/N1

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TFA9878BUK/N1 技术参数

TFA9878_SDS

High Efficiency Class-D Audio Amplifier

Rev. 2 — 5 November 2019

Product data sheet

1 General description

The TFA9878 is a high efficiency 10.0 V boosted class-D audio amplifier. It can deliver

up to 10.0 W peak output power into an 8 Ω speaker and up to 11.8 W peak output

power into a 6 Ω speaker, at a supply voltage of 4.0 V. The internal adaptive DC-to-DC

converter raises the supply voltage up to 10.0 V, providing ample headroom for major

improvements in sound quality.

Internal adaptive DC-to-DC conversion boosts the supply rail to provide additional

headroom and power output. The supply voltage is only raised when necessary,

maximizing the output power of the class-D audio amplifier while limiting quiescent power

consumption.

The device can be configured to drive either a hands-free speaker (4 Ω to 8 Ω) for audio

playback or a receiver speaker (32 Ω), for handset playback. So, it can be embedded in

platforms supporting both a hands-free speaker and a handset speaker. The maximum

output power and the noise levels are lower in handset call use case than in hands-free

call use case.

The TFA9878 also incorporates battery protection. By limiting the supply current when

the battery voltage is low, it prevents the audio system from drawing excessive load

currents from the battery, which could cause a system under voltage. This circuitry

minimizes the impact of a falling battery voltage by preventing unexpected device switch

off due to excessive current drawn from the battery.

The device contains MIPI v 1.1 compliant SoundWire interface which is used for audio

data and control communication with the audio host. Furthermore, it can be used in

legacy mode where TDM is used as audio interface and I²C used for controlling the

device.

The TFA9878 is available in a 36-bump wafer level chip-size package (WLCSP) with a

400 μm pitch.

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