HT338MTER datasheet(17/19 Pages) HEROIC

17 / 19 page

HT338

Stereo Class D Amplifier

-17-

8/2023 – V1.1

(4) Over-voltage Protection function (OVP)

The HT338 device monitors the voltage on AVDD voltage.

When the voltage on AVDD pin exceeds the over-voltage

threshold (32V typ), the OVP circuit puts the device into

shutdown mode. The device recovers automatically once the

over-voltage condition has been removed.

(5) Under-Voltage Protection (UVP)

This is the function to establish the under-voltage protection

mode when power supply becomes lower than the detection

voltage VUVLL (Typ 4.2V), and the protection mode is canceled

when the power supply becomes higher than the threshold

voltage VUVLH (Typ 4.4V). In the under-voltage protection

mode, the differential output pin becomes weak low state (a

stage grounded through resistivity). HT338 will start up within

start-up time when the under-voltage protection mode is

cancelled.

（

4）过压保护

HT338 监控 AVDD 电压上的电压。当 AVDD

引脚上的电压超过过电压阈值（

32V 典型值）时，

OVP 电路将 HT338 置于关机模式。一旦消除过

电压情况，设备将自动恢复。

（

5）欠压保护

该功能是当电源低于检测电压

VUVLL(Typ

4.2V)时建立欠压保护模式，当电源高于阈值电

压

VUVLH(Typ 4.4V)时取消保护模式。在欠压保

护模式下，输出引脚变为弱下拉状态

(通过电阻

接地

)。取消欠压保护模式后，HT338 会在启动

时间内启动。

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