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.
FEATURES
| APPLICATIONS
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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 |
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