HT37B90 datasheet(47/80 Pages) HOLTEK

47 / 80 page

HT37B90/HT37B70/HT37B50/HT37B30

Rev.1.00

June22,2017

TheIntegratedPowerAmp.

The Power Amp. is an integrated class AB mono

speaker driver contained in HT37B90/70/50/30. It pro-

vides property of high S/N ratio, high slew rate, low dis-

tortion, large output voltage swing, excellent power

supply ripple rejection, low power consumption, low

standbycurrentandpoweroffcontroletc.

AudIn:Audioinput

VBIAS:Speakernon-invertinginputvoltagereference

SP0:AudioNegativeoutput

SP1:AudioPositiveoutput

OUTP RisingTime(tR)

When AMP_EN enable, the Power Amp. need rising

time to output fully on OUTP pin. However, the rising

timedependson.

C1.(*TheC1connectswith VBIAS andVss)

A M P 1

A M P 2

V B I A S

1 0 R

S P 1

A u d I n

B I A S

S P 0

A M P _ E N

S P K

C 1

0 . 1 m F

L C H / R C H

A M P _ E N

O U T P

t R

Capacitor

0.1mF

1mF

4.7mF

10mF

Voltage

2.2V

15ms

30ms

90ms

185ms

15ms

30ms

90ms

185ms

15ms

30ms

90ms

185ms

For battery based applications, power consumption is a key issue, therefore the amplifier should be turned off when in

the standby state. In order to eliminate any speaker sound bursts while turning the amplifier on, the application circuit,

which will incorporate a capacitance value of C1, should be adjusted in accordance with the speaker s audio frequency

response. A greater value of C1 will improve the noise burst while turning on the amplifier. The recommended operation

sequenceis:

TurnOn:audiosignalstandby(1/2VDD)

® enableamplifier ® wait t

R foramplifierready ® audiooutput

TurnOff:audiosignalfinished

® disableamplifier ® wait t

R foramplifieroff ® audiosignaloff

If the application is not powered by batteries and there is no problem with amplifier On/Off issue, a capacitor value of

0.1

mFforC1isrecommended.

HowtouseintegratedpowerAmp?

· Connectthe

²InternalPowerAmpCircuit²,pleaserefertoApplicationCircuits.

· Set DACC.3toenableintegratedpoweramp.Clear DACC.3todisableintegratedpoweramp.

· Usercancontrolitat

²PowerAmpDisable² and ²PowerAmpEnable² of HT-MDS.

L C H / R C H

A M P _ E N

t R

HT37B90 Datasheet(PDF) 47 Page - Holtek Semiconductor Inc

HT37B90 Datasheet(HTML) 47 Page - Holtek Semiconductor Inc

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