HT8691

Class D Audio Amplifier

Copyright ©2016, Jiaxing Heroic Technology Co., Ltd

-4-

11/2016 – V0.1

VBAT=3.6V, RL=8Ω+33uH,

THD+N = 10%

80

%

Quiescent current

IBAT

No Load

Input

Grounded

20

mA

With Load*6

20

mA

Maximum Input Signal

VINmax

fIN = 1kHz, THD+N≤10%, ACF

ON

1.2

Vrms

Class AB Channel*7

VSS=0V, VBAT =3.6V, Av=20dB, Ta=25ºC, CIN=0.1uF, unless otherwise specified

Output Power

PO

RL=4Ω,

VBAT=3.6V

f=1kHz,

THD+N=10%

1.3

W

RL=4Ω,

VBAT=4.2V

1.8

RL=4Ω,

VBAT=5.0V

2.65

W

RL=4Ω,

VBAT=3.6V

f=1kHz,

THD+N=1%

1.0

W

RL=4Ω,

VBAT=4.2V

1.5

RL=4Ω,

VBAT=5.0V

2.1

W

Total

Harmonic

Distortion plus Noise

THD+N

PO=0.01W

RL=4Ω,

f=1kHz

0.12

%

PO=0.1W

0.1

%

Output Noise

VN

f=20Hz~20kHz, A weighted,

Av=20dB

75

µVrms

Signal to Noise Ratio

SNR

A weighted, Av=20dB, THD+N

= 1%

90

dB

Output offset voltage

VOS

±

4

mV

Efficiency

η

RL=4Ω+22uH, THD+N = 10%

70

%

RL=8Ω+33uH, THD+N = 10%

74.5

%

Quiescent current

IBAT

No Load

Input

Grounded

20

mA

With Load

20

mA

System Gain

Av0

RIN=56 kΩ

20

dB

Start-up time

(power-on, shutdown

release, or switch from

Class D to Class AB)

tSTUP

270

ms

Digital Input/Output

ACF-Off (Class D)

mode setting threshold

voltage

VMOD1

0.75×

PVDD

PVDD

V

ACF ON (Class D)

mode setting threshold

voltage

VMOD2

0.50×

PVDD

0.60×

PVDD

V

Class AB mode setting

threshold voltage*8

VMOD3

0.15×

PVDD

0.35×

PVDD

V

SD mode setting

threshold voltage

VMOD4

0

0.06×

PVDD

V

SD wake up voltage

VCTRL_ON

0.8

Internal pull-down

Resistor of CTRL

RCTRL

Class D

125

KΩ

Class AB

+∞

MISCELLANEOUS

VBAT start-up threshold

voltage

VUVLH

2.5

V

VBAT shut-down

threshold voltage

VUVLL

2.3

V

*5:

Depending on parts and pattern layout, characteristics may be changed.

*6: 4ohm resistor and 22uH coil are used as an output load in order to simulate a speaker.

*7: In Class AB amplifier mode, boost converter is shutdown automatically. Due to the schottky rectifier, the voltage of PVDD terminal can

be lower than VBAT, depending on the forward voltage of the rectifier.

*8: ACF ON mode is only available in Class D amplifier mode.