HT8320 is a Class D stereo audio amplifier which can deliver continuous 2*4.5W output power into a 4Ω speaker with 4.2V battery supply when THD+N = 10%. The class D audio amplifier’s power supply is adaptively boosted by the integrated charge pump regulator which only works while the output power is big enough. This will significantly extend the playing time in battery supply applications.
HT8320 features Anti-Clipping Function (ACF) which detects output signal clip due to the over input signal and suppresses the output signal clip automatically. Also, it can adapt the output clip caused by power supply voltage down. It can significantly improve the sound quality, creating a very comfortable musical enjoyment, and to protect the speakers from overload damage. It provides 4 different ACF modes and ACF OFF mode to adjust different applications.
Class AB amplifier mode is also available for HT8320. Once the EMI Interference from class D and Boost Converter becomes an annoying problem, HT8320 can be changed into Class AB mode.
HT8320 has a filter-less modulation circuit which directly drives speakers while realizes low distortion and low noise characteristics. Thanks to filter-less, circuit design with fewer external parts can be made in portable applications.
HT8320 has an internal gain of 28dB and an independent Shutdown function which can minimize the power consumption. As for protection function, over current protection function for speaker output terminals, over temperature protection function, and low supply voltage malfunction preventing function are also prepared.
FEATURE
| APPLICATIONS
|
TSSOP24-PP Top View
TERMINAL FUNCTION
SOP Terminal No. | Name | I/O | ESD Protection | Description |
0 | GND | GND | -- | Ground |
1 | PVDD1 | POWER | PN | Power supply for audio amplifier 1 |
2 | OUT1N | O | PN | Negative BTL audio output 1 |
3 | PVBAT1 | POWER | PN | Power supply for the charge pump regulator 1 |
4 | CPOUT1 | POWER | PN | Boosted voltage output of the charge pump regulator 1 |
5 | C1P | I | PN | Flying capacitor positive terminal for charge pump 1 |
6 | C1N | I | PN | Flying capacitor negative terminal for charge pump 1 |
7 | OUT2N | O | PN | Negative BTL audio output 2 |
8 | OUT2P | O | PN | Positive BTL audio output 2 |
9 | CPOUT2 | POWER | PN | Boosted voltage output of the charge pump regulator 2 |
10 | PVBAT2 | POWER | PN | Power supply for the charge pump regulator 2 |
11 | C2P | I | PN | Flying capacitor positive terminal for charge pump 2 |
12 | C2N | I | PN | Flying capacitor negative terminal for charge pump 2 |
13 | GND | GND | -- | GND |
14 | ACF | I | PN | ACF selection terminal. ACF is disabled when it is pulled to VBAT directly. |
15 | AVBAT2 | POWER | PN | Analog power supply 2 |
16 | PVDD2 | POWER | PN | Power supply for audio amplifier 2 |
17 | IN2P | I | PN | Positive audio input terminal 2 |
18 | IN2N | I | PN | Negative audio input terminal 2 |
19 | BYPASS | O | PN | Analog reference terminal, connecting a 1uF capacitor to ground |
20 | AVBAT1 | POWER | PN | Analog power supply 1 |
21 | IN1P | I | PN | Positive audio input terminal 1 |
22 | IN1N | I | PN | Negative audio input terminal 1 |
23 | CTRL | I | PN | Mode selection terminal. When it is pulled low, the device goes into shutdown mode. |
24 | OUT1P | O | PN | Positive BTL audio output 1 |
I: Input; O: Output