HT338MTER datasheet(12/19 Pages) HEROIC

12 / 19 page

HT338

Stereo Class D Amplifier

-12-

8/2023 – V1.1

◼ APPLICATION INFORMATION

1 Power Supply

The power supply for the HT338 only require one voltage

from 4.5V to 26V, which supplies the analog circuitry and the

power stage

The AVDD supply feeds internal LDO including GVDD. This

LDO output is connected to external pins for filtering purposes,

but should not be connected to external circuits. The filtering

capacitor for GVDD is recommended to be 1uF.

The PVDD (pin27/pin28) feeds the power stage of L channel

and the PVDD (pin15/pin16) feeds the power stage of R

channel. Filtering capacitors of 100nF//1uF//220uF for PVDD

of each channel should be placed close to the PVDD pin and

PGND.

HT338 的电源只需要一个 4.5V 到 26V 的

电压，用于提供模拟电路和功率电路。

AVDD 电源为内部 LDO(包括 GVDD)供电。

这个

LDO 输出连接到外部引脚用于滤波，但不

应该连接到外部电路。

GVDD 的滤波电容建议

为

1uF。

PVDDL (pin27/pin28)为 L 通道的功率级供

电，

PVDDR (pin15/pin16)为 R 通道的功率级供

电。每个通道

PVDD 的 100nF//1uF//220uF 滤

波电容应放置在

PVDD 引脚和 PGND 引脚附近。

2 Amplifier Input and Output

2.1 Amplifier Input Configuration

HT338 is an amplifier with analog input (single-ended or

differential).

For a differential operation, input signals into INP and INN

pins via DC-cut capacitors (CIN) and external input resistors

REIN. See as figure 1. The system gain can be calculated by

Gain≈ 20×log (

R��

RIIN+REIN

), where RF = 400k, RIIN = 10k if

Gain pin = H or floating, RIIN = 20k if Gain pin = L, . And the

high pass cut-off frequency of input signal can be calculated

by �� =

2��(��IIN+��EIN)×��IN

For a single-ended operation, input signals to INP pin via a

DC-cut capacitor (CIN) and external input resistor (REIN). INN

pin should be connected to ground via a DC-cut capacitor and

external input resistor (with the same value of CIN and REIN).

See as figure 2. The Gain and high pass Cut-off frequency are

the same as the above case.

HT338 接受模拟差分或单端音频信号输入，

产生

PWM 脉冲输出信号驱动扬声器。

对差分输入，通过隔直电容

CIN 和输入电阻

REIN 分别输入到 INP 和 INN 端，见图 1。系统

增益Gain≈ 20×log (

R��

RIIN+REIN

), RF = 400k, RIIN =

10k (Gain 脚为高或悬空时)，RIIN = 20k (Gain 脚

为低时

) 。高通滤波器截止频率为 �� =

2��(��IIN+��EIN)×��IN

。

对单端输入，则通过

CIN 耦合到 INP 端。

INN 端必须通过输入电阻和电容（与 CIN、REIN

值相同）接地，见图

2。增益 Gain 和截止频率

fc 与差分输入时相同。。

INP

INN

CIN

REIN

HT338

Front Circuit

ZOUT

RIIN

REIN

RIIN

Figure 1 Differential Input configuration

INP

INN

CIN

REIN

HT338

Front Circuit

ZOUT

RIIN

REIN

RIIN

CIN

Figure 2 Single-ended Input configuration

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