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www.rohm.com
2011.06 - Rev.C
© 2011 ROHM Co., Ltd. All rights reserved.
Middle Power Class-D Speaker Amplifiers
Class-D Speaker Amplifier
for Digital Input
BD5446EFV
●Description
BD5446EFV is a Class D Speaker Amplifier designed for Flat-panel TVs in particular for space-saving and low-power
consumption, delivers an output power of 20W+20W. This IC employs state-of-the-art Bipolar, CMOS, and DMOS (BCD)
process technology that eliminates turn-on resistance in the output power stage and internal loss due to line resistances up
to an ultimate level. With this technology, the IC can achieve high efficiency of 87% (10W+10W output with 8Ω load). In
addition, the IC is packaged in a compact reverse heat radiation type power package to achieve low power consumption
and low heat generation and eliminates necessity of external heat-sink up to a total output power of 40W. This product
satisfies both needs for drastic downsizing, low-profile structures and many function, high quality playback of sound system.
●Features
1) BD5446EFV has two system of digital audio interface.
(I
2
S/LJ format, SDATA: 16 / 20 / 24bit, LRCLK: 32kHz / 44.1kHz / 48kHz, BCLK: 64fs (fixed), SYS_CLK: 256fs (fixed))
2) Within the wide range of the power supply voltage, it is possible to operate in a single power supply. (10~26V)
3) It contributes to miniaturizing, making to the thin type, and the power saving of the system by high efficiency and low heat.
4) S/N of the system can be optimized by adjusting the gain setting among 8 steps. (20~34dB / 2dB step)
5) It has the output power limitation function that can be adjusted to an arbitrary output power.
6) The decrease in sound quality because of the change of the power supply voltage is prevented with the feedback
circuitry of the output. In addition, a low noise and low distortion are achieved.
7) It provides with the best stereo DAC output for the headphone usage. As a result, the output of the selection of the
digital input in two systems is possible.
8) Eliminates pop noise generated when the power supply goes on/off, or when the power supply is suddenly shut off.
High quality muting performance is realized by using the soft-muting technology.
9) BD5446EFV is a highly reliable design to which it has various protection functions.
(High temperature protection, Under voltage protection, Output short protection, Output DC voltage protection and
Clock stop protection)
●Applications
Flat Panel TVs (LCD, Plasma), Home Audio, Desktop PC, Amusement equipments, Electronic Music equipments, etc.,
No.11075ECT14
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Indice de contenidos

Pagina 1 - Class-D Speaker Amplifier

1/31 www.rohm.com 2011.06 - Rev.C© 2011 ROHM Co., Ltd. All rights reserved. Middle Power Class-D Speaker Amplifiers Class-D Speaker Amplifier for Dig

Pagina 2

Technical Note 10/31 BD5446EFV www.rohm.com 2011.06 - Rev.C© 2011 ROHM Co., Ltd. All rights reserved. No. Pin name Pin voltage Pin explanation In

Pagina 3

Technical Note 11/31 BD5446EFV www.rohm.com 2011.06 - Rev.C© 2011 ROHM Co., Ltd. All rights reserved. ●GAIN1 pin, GAIN2 pin, GAIN3 pin function GAIN3

Pagina 4

Technical Note 12/31 BD5446EFV www.rohm.com 2011.06 - Rev.C© 2011 ROHM Co., Ltd. All rights reserved. ●Input digital audio signal sampling frequency (

Pagina 5

Technical Note 13/31 BD5446EFV www.rohm.com 2011.06 - Rev.C© 2011 ROHM Co., Ltd. All rights reserved. LRCLK(SDATA2)BCLKSDATA1LchRch32 clocks32 clocksF

Pagina 6

Technical Note 14/31 BD5446EFV www.rohm.com 2011.06 - Rev.C© 2011 ROHM Co., Ltd. All rights reserved. ●Audio Interface format and timing Recommended

Pagina 7

Technical Note 15/31 BD5446EFV www.rohm.com 2011.06 - Rev.C© 2011 ROHM Co., Ltd. All rights reserved. ●Power supply start-up sequence

Pagina 8

Technical Note 16/31 BD5446EFV www.rohm.com 2011.06 - Rev.C© 2011 ROHM Co., Ltd. All rights reserved. ●Power supply shut-down sequence VCCP1 (53, 54p

Pagina 9

Technical Note 17/31 BD5446EFV www.rohm.com 2011.06 - Rev.C© 2011 ROHM Co., Ltd. All rights reserved. ●About the protection function Protection fun

Pagina 10 - BD5446EFV

Technical Note 18/31 BD5446EFV www.rohm.com 2011.06 - Rev.C© 2011 ROHM Co., Ltd. All rights reserved. 1) High temperature protection This IC has the h

Pagina 11

Technical Note 19/31 BD5446EFV www.rohm.com 2011.06 - Rev.C© 2011 ROHM Co., Ltd. All rights reserved. 2) Under voltage protection This IC has the unde

Pagina 12

Technical Note 2/31 BD5446EFV www.rohm.com 2011.06 - Rev.C© 2011 ROHM Co., Ltd. All rights reserved. ●Absolute maximum ratings (Ta=25℃) Parameter Symb

Pagina 13

Technical Note 20/31 BD5446EFV www.rohm.com 2011.06 - Rev.C© 2011 ROHM Co., Ltd. All rights reserved. 3) Clock stop protection This IC has the clock s

Pagina 14

Technical Note 21/31 BD5446EFV www.rohm.com 2011.06 - Rev.C© 2011 ROHM Co., Ltd. All rights reserved. 4)Output short protection(Short to the power sup

Pagina 15

Technical Note 22/31 BD5446EFV www.rohm.com 2011.06 - Rev.C© 2011 ROHM Co., Ltd. All rights reserved. 6) DC voltage protection in the speaker When the

Pagina 16

Technical Note 23/31 BD5446EFV www.rohm.com 2011.06 - Rev.C© 2011 ROHM Co., Ltd. All rights reserved. ●Output power limiter function This IC is provid

Pagina 17

Technical Note 24/31 BD5446EFV www.rohm.com 2011.06 - Rev.C© 2011 ROHM Co., Ltd. All rights reserved. ●Application Circuit Example(RL_SP=8Ω)

Pagina 18

Technical Note 25/31 BD5446EFV www.rohm.com 2011.06 - Rev.C© 2011 ROHM Co., Ltd. All rights reserved. ●BOM list(RL_SP=8Ω) Parts Parts No. Value Com

Pagina 19

Technical Note 26/31 BD5446EFV www.rohm.com 2011.06 - Rev.C© 2011 ROHM Co., Ltd. All rights reserved. ●Application Circuit Example(RL_SP=6Ω)

Pagina 20

Technical Note 27/31 BD5446EFV www.rohm.com 2011.06 - Rev.C© 2011 ROHM Co., Ltd. All rights reserved. ●BOM list(RL_SP=6Ω) Parts Parts No. Value Com

Pagina 21

Technical Note 28/31 BD5446EFV www.rohm.com 2011.06 - Rev.C© 2011 ROHM Co., Ltd. All rights reserved. ●Output LC Filter Circuit An output filter is re

Pagina 22

Technical Note 29/31 BD5446EFV www.rohm.com 2011.06 - Rev.C© 2011 ROHM Co., Ltd. All rights reserved. ●Notes for use 1 ) Absolute maximum ratings Use

Pagina 23

Technical Note 3/31 BD5446EFV www.rohm.com 2011.06 - Rev.C© 2011 ROHM Co., Ltd. All rights reserved. ●Electrical characteristics (Unless otherwise spe

Pagina 24

Technical Note 30/31 BD5446EFV www.rohm.com 2011.06 - Rev.C© 2011 ROHM Co., Ltd. All rights reserved. ●Allowable Power Dissipation

Pagina 25

Technical Note 31/31 BD5446EFV www.rohm.com 2011.06 - Rev.C© 2011 ROHM Co., Ltd. All rights reserved. ●Ordering part number B D 5 4 4 6 E F V - E 2

Pagina 26

DatasheetDatasheet Notice - GE Rev.002© 2014 ROHM Co., Ltd. All rights reserved. Notice Precaution on using ROHM Products 1. Our Products are de

Pagina 27

DatasheetDatasheet Notice - GE Rev.002© 2014 ROHM Co., Ltd. All rights reserved. Precautions Regarding Application Examples and External Circuits

Pagina 28

DatasheetDatasheet Notice – WE Rev.001© 2014 ROHM Co., Ltd. All rights reserved. General Precaution 1. Before you use our Pro ducts, you are requ

Pagina 29

Technical Note 4/31 BD5446EFV www.rohm.com 2011.06 - Rev.C© 2011 ROHM Co., Ltd. All rights reserved. ●Electrical characteristic curves(VCC=13V,Ta=25℃,

Pagina 30 - Technical Note

Technical Note 5/31 BD5446EFV www.rohm.com 2011.06 - Rev.C© 2011 ROHM Co., Ltd. All rights reserved. ●Electrical characteristic curves(VCC=18V,Ta=25℃,

Pagina 31 - 5 4 4 6 E F V - E 2

Technical Note 6/31 BD5446EFV www.rohm.com 2011.06 - Rev.C© 2011 ROHM Co., Ltd. All rights reserved. ●Pin configuration and Block diagram

Pagina 32 - Datasheet

Technical Note 7/31 BD5446EFV www.rohm.com 2011.06 - Rev.C© 2011 ROHM Co., Ltd. All rights reserved. ●Pin function explanation (Provided pin voltages

Pagina 33

Technical Note 8/31 BD5446EFV www.rohm.com 2011.06 - Rev.C© 2011 ROHM Co., Ltd. All rights reserved. No. Pin name Pin voltage Pin explanation Int

Pagina 34 - DatasheetDatasheet

Technical Note 9/31 BD5446EFV www.rohm.com 2011.06 - Rev.C© 2011 ROHM Co., Ltd. All rights reserved. No. Pin name Pin voltage Pin explanation Int

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