BL6331CP datasheet(2/12 Pages) BELLING

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BL6331

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Function Block Diagram

33nF

Pre

AMP

Data

precessor

Driver

Non-clip

Modulator

Digtal

Controller

Internal

Oscillator

VREF

Generator

VDD

IN+

IN-

VREF

AGND

CTRL

PGND

PVDD

VO+

VO-

BL6331

Class D

Modulator

UVP

OTP

OCD

Description of operating functions

&Component Recommended

1、

、

、 Digital amplifier function

BL6331 The BL6311 is a 3-W high efficiency filter-free class-D audio power amplifier in a wafer

chip scale package (WLCSP) that requires only four external components.

•

Use a capacitor (1 μ F or more) with low enough ESR between VDD and GND as a

decoupling capacitor.

•

Use a capacitor (1μF) between VREF and GND to stabilize the VDD/2 Common-mode

voltage.

•

Use a capacitance of 0.1μF or less (e.g. 33nF), ±10% as a DC-cut capacitor (CIN) to

reduce pop noise.

For a differential input, input signal to IN+ and IN- pins via DC-cut capacitor (CIN). For a single-

ended input, input a signal to IN+ via DC-cut capacitor (CIN). At this time, IN- pin should be

connected to AGND via a DC-cut capacitor (CIN) with the same capacitance.

BL6331

CIN

33nF

CIN

33nF

IN+

IN-

Zout

<600ohm

FrontCircuit

BL6331

CIN

33nF

CIN

33nF

IN+

IN-

Zout

<600ohm

Differential input

Singe input

FrontCircuit

Notice：Please start up the former source circuit first to stabilize the DC bias point and then cancel

the shutdown state of BL6331. The time required to stabilize the voltage is decided by CIN, ZOUT of

front circuit and the input impedance of BL6331 (28.6K

typ.). The cut-off frequency of an input

signal is 169Hz at CIN=33nF.

2、

、

、 Non-clip control Function

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