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HT876
2×10.9W Class D Audio Amplifier with Flexible Limiter

HT876 is a stereo Class D and Class AB audio amplifier, which can deliver 2×10.9W (4Ω Load, BTL mode) power at the condition of VDD = 9.0V, THD+N = 10%, 1kHz sine wave in Class D mode.

HT876 integrates adjustable Limiter Function, which can be set by a resistor at the LIM pin to ground or AVDD, so that the output music can be limited below the preset power and THD+N. 

The HT876 Thermal Foldback (TFB) is designed to protect the HT876 from excessive die temperature in case of the device being operated beyond the recommended temperature or power limit (more easily happened in Class AB mode), or with a weaker thermal system than recommended. The TFB works by reducing the on-die power dissipation by reducing Gain if the temperature trig point is exceeded, so that the peak audio power is significantly increased.

HT876 has a filter-less modulation circuit which can directly drive speakers. HT876 can be shut down so that the power consumption can be minimized. As for protection function, over temperature protection function and low supply voltage malfunction preventing function are also prepared.


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FEATURES

  • Flexible Limiter Function adjusted by outside resistor so that the output music is limited under a preset THD+N and power

  • Integrated Thermal Foldback (TFB) Function

  • Significantly increase the peak audio power

  • Paralleled Bridge Tied Load (PBTL)

  • Both Class D and Class AB is available

  • THD+N: 0.02%(VDD = 8.4V, RL = 4Ω, fIN = 1kHz, Po = 2×1.0W, BTL)

  • Output Power (fIN = 1kHz, THD+N = 10%)
    2×10.9W (VDD=9.0V, RL=4Ω, BTL)
    18W (VDD=8.4V, RL=2Ω, PBTL)

  • Power Supply VDD: 2.5V~9.8V

  • Multiple Gain Available: 21dB, 25.5dB, 30dB

  • Filter-less Modulation

  • Thermal/Low voltage malfunction prevention function with auto recovery

  • Pb-free Packages, TSSOP20L-PP


APPLICATIONS

  • Bluetooth/Smart Speakers 

  • Portable Speakers

  • 2.1Channel Speakers    

  • Megaphone

  • Portable Gamers          

  • MP4, GPS

  • LCD TV/Monitor      

  • Tablet PC/Note Book


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TERMINAL FUNCTION

HT876B Terminal

No.

PIN NAME

I/O

Description

1, 3, 11, 20

NC

/

No connection inside the device, connect to GND for better thermal performance

2

AVDD

P

Analog power supply terminal

4

INL+

I

Positive input terminal (differential+) for left channel

5

INL-

I

Negative input terminal (differential-) for left channel

6

INR-

I

Negative input terminal (differential-) for right channel

7

INR+

I

Positive input terminal (differential+) for right channel

8

ABD

I

Class AB and Class D switch terminal; configure the device to operate in Class AB mode when it is
pulled high, and Class D mode when it is pulled low

9

MUTE

I

Mute control terminal; configure the device to operate in mute mode when it is pulled high

10

LIM

I

Limiter function terminal; disable the function when it is pulled low

12

GAIN

O

Gain selection terminal

13

OUTR+

O

Positive output terminal (BTL+) for right channel

14

PVDDR

O

Power supply terminal for right channel

15

OUTR-

O

Negative output terminal (BTL-) for right channel

16

OUTL-

O

Negative output terminal (BTL-) for left channel

17

PVDDL

P

Power supply terminal for left channel

18

OUTL+

O

Positive output terminal (BTL+) for left channel

19

EN

I

Enable terminal; the device goes into shutdown mode when it is pulled low

PAD

GND

G

Power ground

 I: input, O: output, P: power, G: ground