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BD5632NUX, BD5634NUX, BD5638NUX

www.rohm.com

2010.06 - Rev.A

© 2010 ROHM Co., Ltd. All rights reserved.

Technical Note

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Evaluation board Parts List

Qty.

Item

Description

SMD Size

Manufacturer / Part Number

2

C1, C2

Capacitor, 0.47μF

0603

Murata

GRM188R71A474KA01D

1

C3

Capacitor, 10μF

A (3216)

ROHM

TCFGA1A106M8R

1

S1

Slide Switch

4mm X 10.2mm

NKK

SS-12SDP2

1

U1

IC

Mono Class-D audio amplifier

2.0mm X 3.0mm

VSON Package

ROHM

BD5632/34/38NUX

1

PCB1

Printed-circuit board,

BD5632/34/38NUX EVM

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Description of External components

1. Input coupling capacitor (C1, C2)

It makes an Input coupling capacitor 0.47µF.

It sets cutoff frequency fc by the following formula by input coupling capacitor C1 (=C2) and input impedance Ri.

In case of C1 (=C2) =0.47µF

BD5632NUX Ri =100kΩ : fc=3.5Hz

BD5634NUX Ri =50kΩ : fc=7Hz

BD5638NUX Ri =25kΩ : fc=14Hz

2. Power decoupling capacitor (C3)

It makes a power decoupling capacitor 10µF.

When making capacitance of the power decoupling capacitor, there is an influence in the Audio characteristic.

When making small, careful for the Audio characteristic at the actual application.

[Hz]

1

C

Ri

2

1

fc







π