HT338 datasheet(14/19 Pages) HEROIC

14 / 19 page

HT338

Stereo Class D Amplifier

-14-

8/2023 – V1.1

2.3 PBTL Mode Configuration

The HT338 can be configured to drive a single speaker with

the two output channels connected in parallel. This mode of

operation is called Parallel Bridge Tied Load (PBTL) mode.

This mode of operation effectively reduces the output

impedance of the amplifier in half, which in turn reduces the

power dissipated in the device due to conduction losses

through the output FETs. Additionally, since the output

channels are working in parallel, it also doubles the amount of

current the speaker amplifier can source before hitting the

over-current error threshold.

To place the HT338 into PBTL Mode, the LINP and LINN pin

should be directly connected to Ground. When operated in

PBTL mode, the output pins should be connected as shown in

the Typical Application Circuit Diagrams.

In PBTL mode, the amplifier accepts its source signal from the

R channel of the stereo signal.

HT338 可工作在单声道输出的 PBTL 模式，

此时两个输出通道需要并联。在这种模式下，输

出线损降低了一般，从而减小了功率损耗，同时，

喇叭可流过的最大电流也翻倍了。

LINP 和 LINN 直接短接至地，可使 HT338

进入

PBTL 模式，输出需要短接，参见下图。此

时，信号从

R 通道进入。

1µF

120R Bead

Or 10uH

1nF or

0. 68µF

1µF

120R Bead

Or 10uH

1nF or

0. 68µF

LBSP

LBSN

RBSP

RBSN

LOUTP

ROUTP

LOUTN

ROUTN

1µF

RIN

1µF

RIN

LINP

LINN

RINN

RINP

Input

Figure 5 PBTL configuration

2.4 MUTE Function

HT338 can work in mute mode by setting MUTE therminal as

high. Otherwise, the mute terminal can be floating or

connected to GND, HT338 goes into normal operation.

For a better power on and power-off pop performance, place

the amplifier in the MUTE mode prior to delivering or

removing the power supply.

MUTE 引脚可控制芯片进入静音状态。即当

MUTE 引脚为高电平时，HT338 进入静音状态；

MUTE 引脚为悬空或低电平时，HT338 进入正

常播放状态。

上下电时，为减小

pop 声，在上、下电前，

将功放设置进入

MUTE 状态。

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