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2011.06 - Rev.C

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.

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

Summary of content (34 pages)

PAGE 1
Middle Power Class-D Speaker Amplifiers Class-D Speaker Amplifier for Digital Input BD5446EFV No.11075ECT14 ●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.
PAGE 2
Technical Note BD5446EFV ●Absolute maximum ratings (Ta=25℃) Parameter Supply voltage Symbol VCC Ratings Unit Conditions 30 V Pin 25, 28, 29, 53, 54 2.0 W *3 *4 *1 *2 Power dissipation Pd 4.5 W 6.2 W *5 Input voltage VIN -0.3 ~ 4.5 V Pin 7 ~ 18, 21 *1 Pin24 *1 Open-drain terminal voltage VERR -0.
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Technical Note BD5446EFV ●Electrical characteristics (Unless otherwise specified Ta=25℃,Vcc=13V,f=1kHz,RL_SP=8Ω,RL_DA=20kΩ,RESETX=3.3V,MUTEX=3.3V,PDX=3.3V, Gain=20dB,fs=48kHz) Limits Item Symbol Unit Conditions Min Typ Max Total circuit Circuit current Pin 25, 28, 29, 53, 54 No load Pin 25, 28, 29, 53, 54,No load RESETX=0V,MUTEX=0V,PDX=0V ICC1 - 45 90 mA ICC2 - 1.5 3 mA VERR - - 0.8 V Pin 24,IO=0.5mA Regulator output voltage 1 VREG_G 5.0 5.5 6.
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Technical Note BD5446EFV ●Electrical characteristic curves(VCC=13V,Ta=25℃,RL_SP=8Ω,RL_DA=20kΩ,Gain=20dB,fin=1kHz,fs=48kHz) Measured by ROHM designed 4 layer board. 80 Sampling 60 50 40 Mute 30 20 10 0 3 THD=10% THD=1% 0 Fig.1 VOLTAGE GAIN(dB) EFFICIENCY(%) 80 70 60 50 40 30 20 10 0 8 10 30 28 26 24 22 20 18 16 14 12 10 20 25 30 Without signal BW=20～20KHz -20 -40 -60 -80 -100 -140 100 1k 10k 100k 10 100 1k 10k FREQUENCY(Hz) FREQUENCY(Hz) Fig.4 Fig.5 Fig.
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Technical Note BD5446EFV ●Electrical characteristic curves(VCC=18V,Ta=25℃,RL_SP=8Ω,RL_DA=20kΩ,Gain=20dB,fin=1kHz,fs=48kHz) Measured by ROHM designed 4layer board. 100 70 60 50 40 30 20 10 36 34 Po=1W L=22µH C=0.47µF Cg=0.068µF 32 30 28 26 5 10 15 20 -80 -100 -140 10 100 OUTPUT POWER(W /ch) 1k 10k 10 100k 100 1k 10k 100k FREQUENCY(Hz) FREQUENCY(Hz) Fig.13 Fig.14 Fig.
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Technical Note BD5446EFV ●Pin configuration and Block diagram VCCP1 1 REG_G1 54 2 FILP 53 3 Power Limiter NC 52 4 FILA 51 5 REG_3 50 REG_G1 GNDA 6 49 Driver 1P 7 NC 48 NC 47 8 9 I2S/LJ Interface 46 Driver 1N 10 45 GNDP1 11 44 12 43 Control Interface 13 14 15 REG_G1 I2S/LJ Selector 42 ×8 Over Sampling Digital Filter PWM Modulator NC 40 REG_G2 39 16 17 Gain Selector 38 Driver 2N 18 19 37 GNDP2 TEST 36 NC 35 20 21 41 DAC Selector Driver 2P NC 34 22 33 DAC
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Technical Note BD5446EFV ●Pin function explanation (Provided pin voltages are typ. Values) No. Pin name Pin voltage Pin explanation Internal equivalence circuit 53,54 28,29 1 27 REG_G1 REG_G2 5.5V Internal power supply pin for ch1 Gate driver Internal power supply pin for ch2 Gate driver 1 27 550K Please connect the capacitor. 45,46 36,37 25 Bias pin for PWM signal 2 FILP 1.75V~2.55V 2 Please connect the capacitor.
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Technical Note BD5446EFV No.
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Technical Note BD5446EFV No. Pin name Pin voltage Pin explanation Internal equivalence circuit 25 OUT_DAC2 OUT_DAC1 22,23 2.5V Please connect it with the latter part circuit through the capacitor. 50K 22 23 ch2 DAC output pin ch1 DAC output pin 6 25 Error flag pin 500 24 ERROR 3.3V Please connect pull-up resistor. H: While Normal L: While Error 24 6 25 VCCA VCC 26,30 34,35 41,47 48,52 N.C. － www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved.
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Technical Note BD5446EFV No. Pin name Pin voltage 28,29 VCCP2 Vcc 31,32 OUT2P Vcc~0V Pin explanation Internal equivalence circuit Power supply pin for ch2 PWM signal 28,29 33 BSP2P － 36,37 GNDP2 0V 38,39 OUT2N Vcc~0V Output pin of ch2 positive PWM Please connect to Output LPF. Boot-strap pin of ch2 positive Please connect the capacitor. 33 40 31,32 38,39 GND pin for ch2 PWM signal Output pin of ch2 negative PWM Please connect to Output LPF.
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Technical Note BD5446EFV ●GAIN1 pin, GAIN2 pin, GAIN3 pin function GAIN3 (18pin) GAIN2 (17pin) GAIN1 (16pin) Speaker output gain L L L 20dB L L H 22dB L H L 24dB L H H 26dB H L L 28dB H L H 30dB H H L 32dB H H H 34dB ●SEL_DAC pin function SEL_DAC (21pin) OUT_DAC1 (23pin) OUT_DAC2 (24pin) L The Lch signal of SDATA1 is output The Rch signal of SDATA1 is output H The Lch signal of SDATA2 is output The Rch signal of SDATA2 is output ●RESETX pin function RESETX (10pi
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Technical Note BD5446EFV ●Input digital audio signal sampling frequency (fs) explanation PWM sampling frequency, Soft-start, Soft-mute time, and the detection time of the DC voltage protection in the speaker depends on sampling frequency (fs) of the digital audio input. Sampling frequency of the digital audio input (fs) 32kHz PWM sampling frequency (fpwm) Soft-start / Soft-mute time DC voltage protection in the speaker detection time 512kHz 64msec. 64msec. 44.1kHz 705.6kHz 46msec. 46msec.
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Technical Note BD5446EFV ●I2S data format 1/64fs LRCLK Lch Rch BCLK SDATA1 MSB 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 LSB MSB 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 LSB (SDATA2) 32 clocks 32 clocks Fig.20 I2S Data Format 64fs, 24 bit Data Lch LRCLK Rch BCLK SDATA1 MSB 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 MSB LSB 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 LSB (SDATA2) Fig.
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Technical Note BD5446EFV ●Audio Interface format and timing Recommended timing and operating conditions (MCLK, BCLK, LRCLK, SDATA) 1/ｆ / SYS_CLK SYS_CLK 1/fLRCLK LRCLK 1/fBCLK BCLK Fig-26 Clock timing LRCLK tHD;LR tSU;LR BCLK tHD ; SD tSU ; SD SDATA Fig-27 Audio Interface timing (1) SYS_CLK tHD ; BC tSU ; BC BCLK Fig-28 Audio Interface timing (2) Parameter Symbol Limit Unit Min. Max. fSYS_CLK 8.192 12.
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Technical Note BD5446EFV ●Power supply start-up sequence VCCA (25pin) VCCP1 (53, 54pin) VCCP2 (28, 29pin) ①Power up VCCA, VCCP1, VCCP2 simultaneously. t REG_3 (5pin) REG_G1 (1pin) REG_G2 (27pin) REG_G1, REG_G2 REG_3 t RESETX (12pin) ②Set RESETX to High after power up. t SYS_CLK (7pin) BCLK (8pin) LRCLK (9pin) SDATA1 (10pin) SDATA2 (11pin) ③Degital audio data communication. t PDX (14pin) ④Set PDX to High. t OUT_DAC1 (23pin) OUT_DAC2 (22pin) t MUTEX (13pin) ⑤Set MUTEX to High.
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Technical Note BD5446EFV ●Power supply shut-down sequence VCCA (25pin) VCCP1 (53, 54pin) VCCP2 (28, 29pin) ⑤Power down VCCA, VCCP1, VCCP2, simultaneously. t REG_3 (5pin) REG_G1 (1pin) REG_G2 (27pin) REG_G1, REG_G2 REG_3 t RESETX (12pin) ④Set RESETX to Low t SYS_CLK (7pin) BCLK (8pin) LRCLK (9pin) SDATA1 (10pin) SDATA2 (11pin) ③Stop digital audio date signal. t PDX (14pin) ②Set PDX to Low. t OUT_DAC1 (23pin) OUT_DAC2 (22pin) t MUTEX (13pin) ①Set MUTEX to Low.
PAGE 17
Technical Note BD5446EFV ●About the protection function Protection function Detecting & Releasing condition Output short protection Detecting condition Detecting current = 10A (TYP.) DC voltage protection in the speaker Detecting condition PWM output Duty=0% or 100% 43msec(fs=48kHz) above fixed Detecting condition Chip temperature to be above 150℃ (TYP.) High temperature protection Under voltage protection DAC Output Normal operation Chip temperature to be below 120℃ (TYP.
PAGE 18
Technical Note BD5446EFV 1) High temperature protection This IC has the high temperature protection circuit that prevents thermal reckless driving under an abnormal state for the temperature of the chip to exceed Tjmax=150℃. Detecting condition - It will detect when MUTE pin is set High and the temperature of the chip becomes 150℃(TYP.) or more. The speaker output is muted through a soft-mute when detected.
PAGE 19
Technical Note BD5446EFV 2) Under voltage protection This IC has the under voltage protection circuit that make speaker output mute once detecting extreme drop of the power supply voltage. Detecting condition – It will detect when MUTE pin is set High and the power supply voltage becomes lower than 8V. The speaker output is muted through a soft-mute when detected. Releasing condition – It will release when MUTE pin is set High and the power supply voltage becomes more than 9V.
PAGE 20
Technical Note BD5446EFV 3) Clock stop protection This IC has the clock stop protection circuit that make the speaker output mute when the SYS_CLK signal of the digital audio input stops. Detecting condition - It will detect when MUTE pin is set High and the SYS_CLK signal stops for about 1usec or more. The speaker output is muted through a soft-mute when detected. Releasing condition - It will release when MUTE pin is set High and the SYS_CLK signal returns to the normal clock operation.
PAGE 21
Technical Note BD5446EFV 4)Output short protection(Short to the power supply) This IC has the PWM output short protection circuit that stops the PWM output when the PWM output is short-circuited to the power supply due to abnormality. Detecting condition - It will detect when MUTE pin is set High and the current that flows in the PWM output pin becomes 10A(TYP.) or more. The PWM output instantaneously enters the state of HiZ-Low if detected, and IC does the latch.
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Technical Note BD5446EFV 6) DC voltage protection in the speaker When the DC voltage in the speaker is impressed due to abnormality, this IC has the protection circuit where the speaker is defended from destruction. Detecting condition - It will detect when MUTE pin is set High or Low and PWM output Duty=0% or 100% , 43msec(fs=48kHz) or above. Once detected, The PWM output instantaneously enters the state of HiZ-Low, and IC does the latch.
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Technical Note BD5446EFV ●Output power limiter function This IC is provided with an output power limiter function to protect speakers from destruction by an excessive output. Limiter values are freely specified by changing external resistors R1/R2 as shown in Fig-26. Fig-27 shows a speaker output waveform that is generated with use of the output limiter function. Because the waveform is soft-clipped, unusual noises on audible signals are significantly reduced under operation of limiter.
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Technical Note BD5446EFV ●Application Circuit Example(RL_SP=8Ω) C1 3.
PAGE 25
Technical Note BD5446EFV ●BOM list(RL_SP=8Ω) Parts Parts No. Value Company Product No. Rated Voltage Tolerance Size IC U1 － ROHM BD5446EFV －－ 18.5mm×9.5mm TOKO 1168ER-0001 - (±20%) 10.3mm×7.6mm SAGAMI DBE7210H-220M - (±20%) 10.5mm×6.4mm ROHM MCR18PZHZFL5R60 1/4W F(±1%) 3.2mm×1.6mm Inductor Resistor Capacitor L31, L38, L43, L50 22μH R31B, R38B R43B, R50B 5.6Ω C31, C38, C42, C49 1μF GRM185B31C105KE43 16V B(±10%） 1.6mm×0.8mm C25, C28, C53 0.
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Technical Note BD5446EFV ●Application Circuit Example(RL_SP=6Ω) C1 3.
PAGE 27
Technical Note BD5446EFV ●BOM list(RL_SP=6Ω) Parts Parts No. Value Company Product No. Rated Voltage Tolerance Size IC U1 － ROHM BD5446EFV －－ 18.5mm×9.5mm Inductor L31, L38, L43, L50 15μH SAGAMI DBE7210H-150M － (±20%) 10.5mm×6.4mm Resistor R31B, R38B R43B, R50B 5.6Ω ROHM MCR18PZHZFL5R60 1/4W F(±1%) 3.2mm×1.6mm C31, C38, C42, C49 1µF GRM185B31C105KE43 16V B(±10%） 1.6mm×0.8mm C25, C28, C53, C31A, C38A, C43A, C48A 0.1μF GRM188B31H104KA92 50V B(±10%） 1.6mm×0.
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Technical Note BD5446EFV ●Output LC Filter Circuit An output filter is required to eliminate radio-frequency components exceeding the audio-frequency region supplied to a load (speaker). Because this IC uses sampling clock frequencies from 200kHz to 400kHz in the output PWM signals, the high-frequency components must be appropriately removed. This section takes an example of an LC type LPF shown in Fig.
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Technical Note BD5446EFV ●Notes for use 1 ) Absolute maximum ratings Use of the IC in excess of absolute maximum ratings such as the applied voltage or operating temperature range may result in IC damage. Assumptions should not be made regarding the state of the IC (short mode or open mode) when such damage is suffered. A physical safety measure such as a fuse should be implemented when use of the IC in a special mode where the absolute maximum ratings may be exceeded is anticipated.
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Technical Note BD5446EFV ●Allowable Power Dissipation 7 PCB③ 6.2W Power Dissipation Pd （W) 6 5 PCB② 4.5W 4 3 PCB① 2.0W 2 1 0 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 Ambient Temperature:Ta( ℃) Measuring instrument : TH-156(Shibukawa Kuwano Electrical Instruments Co., Ltd.) Measuring conditions : Installation on ROHM’s board Board size : 70mm×70mm×1.6mm(with thermal via on board) Material : FR4 ・The board on exposed heat sink on the back of package are connected by soldering.
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Technical Note BD5446EFV ●Ordering part number B D 5 Part No. 4 4 6 Part No. E F V - Package EFV : HTSSOP-B54 E 2 Packaging and forming specification E2: Embossed tape and reel HTSSOP-B54 18.5±0.1 (MAX 18.85 include BURR) +6° 4° −4° (6.0) 1PIN MARK 1.0±0.2 0.5±0.15 (5.0) 1 Embossed carrier tape (with dry pack) Quantity 1500pcs 28 7.5±0.1 9.5±0.
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Datasheet Notice Precaution on using ROHM Products 1. Our Products are designed and manufactured for application in ordinary electronic equipments (such as AV equipment, OA equipment, telecommunication equipment, home electronic appliances, amusement equipment, etc.).
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Datasheet Precautions Regarding Application Examples and External Circuits 1. If change is made to the constant of an external circuit, please allow a sufficient margin considering variations of the characteristics of the Products and external components, including transient characteristics, as well as static characteristics. 2. You agree that application notes, reference designs, and associated data and information contained in this document are presented only as guidance for Products use.
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Datasheet General Precaution 1. Before you use our Pro ducts, you are requested to care fully read this document and fully understand its contents. ROHM shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny ROHM’s Products against warning, caution or note contained in this document. 2. All information contained in this docume nt is current as of the issuing date and subj ect to change without any prior notice.