HT338

Stereo Class D Amplifier

Copyright©2023, Heroic Technology

-4-

8/2023 – V1.1

◼ TERMINAL CONFIGURATION

28

27

26

25

24

23

22

21

1

2

3

4

5

6

7

8

NC

SD/FAULT

LINP

LINN

GAIN

TEST

AVCC

AGND

PVDDL

PVDDL

BSPL

LOUTP

NC

LOUTN

BSNL

BSNR

EP

PGND

9

10

11

12

13

14

GVDD

NC

RINN

RINP

MUTE

NC

20

19

18

17

16

15

ROUTN

NC

ROUTP

BSPR

PVDDR

PVDDR

HT338 Top View

◼ TERMINAL FUNCTION

Terminal No.

Name

I/O1

Description

2

\SD/FAULT

I

SD/FAULT, multi-function pin. When pulled down, place the speaker amplifier in

shutdown mode. General fault reporting including Over-Temp, Over-Current, DC Detect.

3

LINP

I

Positive input terminal for L channel

4

LINN

I

Negative input terminal for L channel

5

GAIN

I

Gain select pin. Low = 26dB gain; High or floating = 32dB

6

TEST

I

Test mode select pin. Connect to GND

7

AVCC

P

Analog power supply.

8

AGND

G

Analog signal GND. Connect to PGND.

9

GVDD

O

Voltage regulator derived from AVDD supply, connect 1uF to GND

11

RINN

I

Negative input terminal for R channel

12

RINP

I

Positive input terminal for R channel

13

MUTE

I

When pulled high, place the speaker amplifier in MUTE mode. When pulled low or be

floating, place the speaker amplifier in normal operation.

15/16

PVDDR

P

Power Supply for amplifier drivers of R channel

17

BSPR

BST

Connection point for the ROUTP bootstrap capacitor, which is used to create a power

supply for the high-side gate drive for ROUTP

18

ROUTP

O

Positive pin for differential speaker amplifier output R

20

ROUTN

O

Negative pin for differential speaker amplifier output R

21

BSNR

BST

Connection point for the ROUTN bootstrap capacitor, which is used to create a power

supply for the high-side gate drive for ROUTN

22

BSNL

BST

Connection point for the LOUTN bootstrap capacitor, which is used to create a power

supply for the high-side gate drive for LOUTN

23

LOUTN

O

Negative pin for differential speaker amplifier output L

25

LOUTP

O

Positive pin for differential speaker amplifier output L

26

BSPL

BST

Connection point for the LOUTP bootstrap capacitor, which is used to create a power

supply for the high-side gate drive for LOUTP

27/28

PVDDL

P

Power Supply for amplifier drivers of L channel

1/10/

14/19/24

NC

-

NC, Connect to Ground for better thermal performance

EP

GND

G

Provides both electrical and thermal connection from the device to the board. A matching

ground pad must be provided on the PCB and the device connected to it via solder. For

proper electrical operation, this ground pad must be connected to the system ground. 既

是地，又是散热PAD

1

I: Input; O: Output; G: Ground; P: Power; BST: BOOT Strap;