BD5451EFV_1106

Middle Power Class-D Speaker Amplifiers Class-D Speaker Amplifier for Digital Input BD5451EFV No.11075EAT17 ●Description BD5451EFV 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 15W+15W. 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 90% (15W+15W 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 toｓ a total output power of 30W. This product satisfies both needs for drastic downsizing, low-profile structures and many function, high quality playback of sound system. ●Features 1) This IC has one system of digital audio interface. 2 (I S format, SDATA: 16 / 20 / 24bit, LRCLK: 32kHz / 44.1kHz / 48kHz, BCLK: 64fs(fixed), MCLK: 256fs(fixed)) 2) Low supply current at RESET mode. 3) 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. Eliminate large electrolytic-capacitors for high performance of Power Supply Rejection. 4) S/N of the system can be optimized by adjusting the gain setting among 2 steps. (20dB / 26dB) 5) Available for Monaural mode. 6) Within the wide range of the power supply voltage, it is possible to operate in a single power supply. (10～18V) 7) It contributes to miniaturizing, making to the thin type, and the power saving of the system by high efficiency and low heat. 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) This IC 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, (MCLK, BCLK, LRCLK)) 10) Small package (HTSSOP-B28 package) contributes to reduction of PCB area. ●Applications Flat Panel TVs (LCD, Plasma), Home Audio, Desktop PC, Amusement equipments, Electronic Music equipments, etc. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 1/34 2011.06 - Rev.A BD5451EFV ●Absolute maximum ratings (Ta=25℃) Parameter Supply voltage Symbol VCC Ratings 22 3.3 Power dissipation Pd 4.7 Input voltage Terminal voltage 1 Terminal voltage 2 Terminal voltage 3 Open-drain terminal voltage Operating temperature range Storage temperature range Maximum junction temperature VIN VPIN1 VPIN2 VPIN3 VERR Topr Tstg Tjmax -0.3 ～ 4.5 -0.3 ～ 7.0 -0.3 ～ 4.5 22 -0.3 ～ 22 -25 ～ +85 -55 ～ +150 +150 W V V V V V ℃ ℃ ℃ ※4 Pin 1 ～ 6, 13 Pin 8, 11, 12 Pin 9 Unit V W Technical Note Parameter Pin 14, 15, 16, 27, 28 ※3 ※1 ※2 ※1 ※1 ※1 Pin 17, 18, 20 ～ 23, 25, 26 ※1 Pin 10 ※1 ※1 The voltage that can be applied reference to GND (Pin 7, 19, 24). ※2 Do not, however exceed Pd and Tjmax=150℃. ※3 70mm×70mm×1.6mm, FR4, 2-layer glass epoxy board (Copper on bottom layer : 70mm×70mm) Derating in done at 26.4mW/℃ for operating above Ta=25℃. There are thermal via on the board. ※4 70mm×70mm×1.6mm, FR4, 4-layer glass epoxy board (Copper on bottom layer : 70mm×70mm) Derating in done at 37.6mW/℃ for operating above Ta=25℃. There are thermal via on the board. ●Operating conditions (Ta=25℃) Parameter Supply voltage Symbol VCC Ratings 10 ～ 18 3.6 Minimum load impedance ※5 Do not, however exceed Pd. ※ No radiation-proof design. Unit V Parameter Pin 14, 15, 16, 27, 28 VCC ≦ 18V ※1 ※2 ※5 ※5 RL 3.2 Ω VCC ≦ 16V www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 2/34 2011.06 - Rev.A BD5451EFV Technical Note ●Electrical characteristics (Unless otherwise specified Ta=25℃, Vcc=12V, f=1kHz, RL=8Ω, RSTX=3.3V, MUTEX=3.3V, Gain=20dB, fs=48kHz Output LC filter: L=10µH, C=0.1µF) Limits Parameter Symbol Unit Conditions Min. Typ. Max. Total circuit Circuit current (Reset mode) Circuit current (Mute mode) Circuit current (Sampling mode) Open-drain terminal Low level voltage Regulator output voltage 1 Regulator output voltage 2 High level input voltage Low level input voltage Input current (Input pull-down terminal) Speaker Output Maximum output power 1 Maximum output power 2 PO1 PO２ GV20 Voltage gain GV26 Total harmonic distortion Crosstalk PSRR Output noise voltage (Sampling mode) THD CT PSRR VNO fPWM1 PWM sampling frequency fPWM2 fPWM3 25 66 26 0.07 80 70 100 256 352.8 384 27 200 dB % dB dB μ Vrms kHz kHz kHz PO=1W, Gain=26dB PO=1W, BW=20～20kHz PO=1W, BW=IHF-A Vropple=1Vrms, f= 1kHz -∞dBFS, BW=IHF-A fs=32kHz fs=44.1kHz fs=48kHz ※6 ※6 ※6 ※6 ※6 ※6 ※6 ※6 19 10 15 20 21 W W dB THD+n=10% GAIN=20dB VCC=15V, THD+n=10% GAIN =26dB PO=1W, Gain=20dB ※6 ※6 ※6 ICC1 ICC２ ICC3 VERR VREG_G VREG_3 VIH VIL IIH 4.7 3.0 2.0 0 50 0.1 15 50 5.0 3.3 66 0.2 25 80 0.8 5.3 3.6 3.3 0.9 95 mA mA mA V V V V V μA Pin 14, 15, 16, 27, 28, No load RSTX=0V, MUTEX=0V Pin 14, 15, 16, 27, 28, No load RSTX=3.3V, MUTEX=0V Pin 14, 15, 16, 27, 28, No load RSTX=3.3V, MUTEX=3.3V Pin 10, IO=0.5mA Pin 11 Pin 9 Pin 1 ～ 6, 13 Pin 1 ～ 6, 13 Pin 1 ～ 6, 13, VIN = 3.3V ※6 These items show the typical performance of device and depend on board layout, parts, and power supply. The standard value is in mounting device and parts on surface of ROHM’s board directly. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 3/34 2011.06 - Rev.A BD5451EFV ●Electrical characteristic curves (VCC=12V, Ta=25℃, RL=8Ω, Gain=26dB, fin=1kHz, fs=48kHz) Measured by ROHM designed 4 layer board. 0.20 0.18 0.16 0.14 0.12 ICC [mA] 0.10 0.08 0.06 20 ICC [mA] 50 40 30 80 Technical Note RSTX=MUTEX=L RL=8Ω No signal 70 60 RSTX=H RL=8Ω No signal MUTEX=H MUTEX=L 0.04 0.02 0 .00 8 10 12 14 VCC [V] 16 18 20 10 0 8 10 12 14 VCC [V] 16 18 20 Fig.1 Current consumption - Power supply voltage Fig.2 Current consumption - Power supply voltage 100 90 80 70 EFFICIENCY [%] 60 RL=8Ω 3.5 RL=6Ω RL=4Ω 3 RL=4Ω 2.5 RL=6Ω ICC [A] 2 50 40 30 20 10 0 0 2 4 6 8 10 12 OUTPUT POWER [W/CH] 14 16 18 20 RL=8Ω 1.5 1 VCC=12V Gain=20dB fin=1KHz 0.5 VCC=12V Gain=20dB fin=1KHz 0 2 4 6 8 10 12 OUTPUT POWER [W/CH] 14 16 18 20 0 Fig.3 Efficiency - Output power Fig.4 Current consumption - Output power 5ms/div Speaker output 2V/div VCC=12V RL=8Ω Po=1W fin=500Hz 5ms/div Speaker output VCC=12V RL=8Ω Po=1W fin=500Hz 2V/div MUTEX(2pin) 5V/div MUTEX(2pin) 5V/div Fig.5 Wave form when releasing soft-mute Fig.6 Wave form when activating soft-mute www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 4/34 2011.06 - Rev.A BD5451EFV ●Electrical characteristics (VCC=12V, Gain=26dB, fin=1kHz, fs=48kHz) Measured by ROHM designed 4 layer board. 25 Technical Note RL=8Ω 20 THD+N=10% 3 2.5 THD+N=1% OUTP P ER [W UT OW /CH] RL=8Ω 2 ICC [A] VCC=15V VCC=12V VCC=18V 15 1.5 1 0.5 10 5 0 0 0 8 10 12 14 VCC [V] 16 18 20 10 20 30 40 50 60 TOTAL OUTPUT POWER [W] Fig.7 Output power – Power supply voltage Fig.8 Current consumption - Output power 30 RL=6Ω 25 THD+N=10% 4 3.5 RL=6Ω VCC=15V VCC=12V VCC=18V THD+N=1% 20 O UTP P W [W H] UT O ER /C 3 2.5 ICC [A ] 2 1.5 15 10 1 5 0.5 0 0 8 10 12 14 VCC [V] 16 18 20 0 10 20 30 40 TOTAL OUTPUT POWER [W] 50 60 Fig.9 Output power – Power supply voltage Fig.10 Current consumption - Output power 40 5 35 RL=4Ω THD+N=10% 4.5 4 VCC=15V VCC=12V VCC=18V 30 THD+N=1% IC C [A ] 3.5 3 2.5 2 1.5 O UTP T P W [W H] U O ER /C 25 20 15 10 1 0.5 0 5 0 8 10 12 14 VCC [V] 16 18 20 0 10 20 30 40 TOTAL OUTPUT POWER [W] 50 60 Fig.11 Output power – Power supply voltage Fig.12 Current consumption - Output power ※Dotted line means internal dissipation is over package power. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 5/34 2011.06 - Rev.A BD5451EFV ●Electrical characteristic curves(VCC=12V, Ta=25℃, RL=8Ω, Gain=20dB, fin=1kHz, fs=48kHz) Measured by ROHM designed 4layer board. 0 -10 -20 -30 -40 NOISE FFT [dBV] -50 -60 -70 -80 -90 -100 -110 -120 -130 - 140 10 100 1k FREQUENCY [Hz] 10k 100k 12 10 10 100 1k FREQUENCY [Hz] VOLTAGE GAIN [dB] 30 Technical Note No signal 28 26 24 22 20 18 16 14 Po=1W 10k 100k Fig.13 FFT of output noise voltage Fig.14 Voltage gain - Frequency 100 100 BW=20~20KHZ BW=20~20KHz Po=1W 10 10 THD+N [%] 6KHZ 1KHZ THD+N [%] 1 1 0.1 100HZ 0.01 0.01 0.1 1 OUTPUT POWER [W/CH] 10 100 0.1 0 .01 10 100 1k FREQUENCY [Hz] 10k 100k Fig.15 THD+N – Output power Fig.16 THD+N – Frequency 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 0.01 0.1 1 OUTPUT POWER [W/CH] 10 100 0 BW=20~20KHZ -10 -20 -30 CROSS-TALK [dB] -40 -50 -60 -70 -80 -90 -100 10 100 1k FREQUENCY [Hz] 10k BW=20~20KHz Po=1W CROSS-TALK[dB] 100k Fig.17 Crosstalk – Output power Fig.18 Crosstalk – Frequency www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 6/34 2011.06 - Rev.A BD5451EFV ●Electrical characteristic curves(VCC=12V, Ta=25℃, RL=6Ω, Gain=20dB, fin=1kHz, fs=48kHz) Measured by ROHM designed 4layer board 0 -10 -20 -30 Technical Note No signal 30 28 26 VOLTAGE GAIN [dB] 24 22 20 18 16 14 12 10 10 100 1k FREQUENCY [Hz] 10k 100k Po=1W -40 NOISE FFT [dBV] -50 -60 -70 -80 -90 -100 -110 -120 -130 - 140 10 100 1k FREQUENCY [Hz] 10k 100k Fig.19 FFT of output noise voltage Fig.20 Voltage gain - Frequency 100 100 BW=20~20KHZ 10 THD+N [%] BW=20~20KHz Po=1W 10 6KHZ THD+N [%] 1 1KHZ 1 0.1 100HZ 0.01 0.01 0.1 1 OUTPUT POWER [W/CH] 10 100 0.1 0 .01 10 100 1k FREQUENCY [Hz] 10k 100k Fig.21 THD+N – Output power Fig.22 THD+N – Frequency 0 -10 -20 -30 CROSS-TALK [dB] -40 -50 -60 -70 -80 -90 -100 0.01 0.1 1 OUTPUT POWER [W/CH] 10 100 0 BW=20~20KHZ -10 -20 -30 CROSS-TALK [dB] -40 -50 -60 -70 -80 -90 -100 10 100 1k FREQUENCY [Hz] BW=20~20KHz Po=1W 10k 100k Fig.23 Crosstalk – Output power Fig.24 Crosstalk – Frequency www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 7/34 2011.06 - Rev.A BD5451EFV ●Electrical characteristic curves(VCC=12V, Ta=25℃, RL=4Ω, Gain=20dB, fin=1kHz, fs=48kHz) Measured by ROHM designed 4layer board 0 -10 -20 -30 -40 NOISE FFT [dBV] -50 -60 -70 -80 -90 -100 -110 -120 -130 - 140 10 100 1k FREQUENCY [Hz] 10k 100k 12 10 10 100 1k FREQUENCY [Hz] VOLTAGE GAIN [dB] 30 Technical Note No signal 28 26 24 22 20 18 16 14 Po=1W 10k 100k Fig.25 FFT of output noise voltage Fig.26 Voltage gain - Frequency 100 100 BW=20~20KHZ 10 THD+N [%] BW=20~20KHz Po=1W 10 6KHZ THD+N [%] 1KHZ 1 1 0.1 0.1 100HZ 0.01 0.01 0.1 1 OUTPUT POWER [W/CH] 10 100 0 .01 10 100 1k FREQUENCY [Hz] 10k 100k Fig.27 THD+N – Output power Fig.28 THD+N – Frequency 0 -10 -20 -30 CROSS-TALK [dB] -40 -50 -60 -70 -80 -90 -100 0.01 CROSS-TALK [dB] 0 BW=20~20KHZ -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 BW=20~20KHz Po=1W 0.1 1 OUTPUT POWER [W/CH] 10 100 10 100 1k FREQUENCY [Hz] 10k 100k Fig.29 Crosstalk – Output power Fig.30 Crosstalk – Frequency www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 8/34 2011.06 - Rev.A BD5451EFV ●Pin configuration and Block diagram Technical Note RSTX 1 MUTEX 2 SDATA LRCLK BCLK MCLK GNDA FILP 3 4 5 6 7 8 Control I/F Driver FET 1P I2S I/F Feedback Feedback 28 VCCP1 VCCP1 27 VCCP1 26 OUT1P 25 OUT1P 24 GNDP1 GNDP1 23 OUT1N 22 OUT1N 21 OUT2N Driver FET 2N Feedback Driver FET 1N GNDA FILP REG3 ×8 Over Sampling Digital Filter PWM Modulator REG3 9 ERROR 10 REG_G 11 FILA 12 GAIN 13 VCCA 14 20 OUT2N 19 GNDP2 GNDP2 18 OUT2P 17 OUT2P 16 VCCP2 VCCP2 15 VCCP2 GNDA REG_G FILA Gain Selector Feedback Driver FET 2P Output Short Protection Output DC Voltage Protection Under Voltage Protection Over Voltage Protection Clock Stop Protection High Temperature Protection VCCA www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 9/34 2011.06 - Rev.A BD5451EFV ●Pin function explanation (Provided pin voltages are typ. Values) Pin No. Pin name Pin voltage Pin explanation Technical Note Internal equivalence circuit 14 1 RSTX 0V Reset pin for Digital circuit H: Reset OFF L: Reset ON 17.3k 1 32.7k 7 2 3 4 5 6 12 MUTEX SDATA LRCLK BCLK MCLK GAIN Speaker output mute control pin H: Mute OFF L: Mute ON 14 0V Digital audio signal input pin 2, 3, 4 5, 6, 13 50K Gain setting terminal L: 20dB H: 26dB 7 7 GNDA 0V GND pin for Analog signal － 14 Bias pin for PWM signal 8 FILP 1.75V~2.55V Please connect the capacitor. 8 7 14 Internal power supply pin for Digital circuit 9 REG3 3.3V Please connect the capacitor. 9 500 K 7 14 500 10 Error flag pin 10 ERROR 3.3V Please connect pull-up resister. H: While Normal L: While Error 7 14 Internal power supply pin for Gate driver 11 REG_G 5.2V Please connect the capacitor. 11 500 K 7 www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 10/34 2011.06 - Rev.A BD5451EFV Technical Note Pin No. Pin name Pin voltage Pin explanation Internal equivalence circuit 14 Bias pin for PWM signal. 12 FILA 2.5V Please connect the capacitor. 12 50K 50K 7 14 VCCA Vcc Power supply pin for Analog signal － Power supply pin for ch2 PWM signal 15,16 VCCP2 Vcc Vcc～0V Please connect the capacitor. Output pin of ch2 positive PWM Please connect to Output LPF. 0V GND pin for ch2 PWM signal Output pin of ch2 negative PWM 20,21 OUT2N Vcc～0V Please connect to Output LPF. Output pin of ch1 negative PWM 22,23 OUT1N Vcc～0V Please connect to Output LPF. GND pin for ch1 PWM signal Output pin of ch1 posotive PWM 25,26 OUT1P Vcc～0V Please connect to Output LPF. Power supply pin for ch1 PWM signal 27,28 VCCP1 － Please connect the capacitor. 15,16 17,18 OUT2P 19 GNDP2 17,18 20,21 19 27,28 24 GNDP1 0V 25,26 22,23 24 www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 11/34 2011.06 - Rev.A BD5451EFV ●Terminal setting (1) Gain pin function GAIN (13pin) L H (2) RSTX pin, MUTEX pin function RSTX (1pin) L H H MUTEX (2pin) L or H L H Normalcy PWM output (OUT1P, 1N, 2P, 2N) HiZ_L (Reset mode) HiZ_L (MUTE ON) Normal operation (MUTE OFF) ERROR Output H H H Speaker output gain 20dB 26dB Technical Note Error detecting PWM output (OUT1P, 1N, 2P, 2N) HiZ_L (Reset mode) HiZ_L (MUTE ON) HiZ_L (MUTE ON) ERROR Output H L L ※RSTX(1pin)terminal, MUTEX(2pin)terminal are internally pulled down by 50 kΩ(Typ.) ※With RSTX=L data of every register within IC (I2S / I/F part, ×8 over sampling digital filter part, latch circuit when detecting ERROR) becomes unnecessary. ●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 44.1kHz 48kHz PWM sampling frequency (fpwm) 256kHz 352.8kHz 384kHz DC voltage protection in the speaker detection time 64msec. 46msec. 43msec. Soft-start / Soft-mute time 32msec. 23msec. 21.5msec. ●For voltage gain (Gain setting) BD5451EFV prescribe voltage gain at speaker output (BTL output) under the definition 0dBV (1Vrms) as full scale input of the digital audio input signal. For example, digital audio input signal = -20dBFS (0.1Vrms), Gain setting = 20dB, Load resistance RL = 8Ω will give speaker output (BTL output) amplitude as Vo=1Vrms. (Output power Po = Vo2/R = 0.125W ) www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 12/34 2011.06 - Rev.A BD5451EFV ●Format of digital audio input Technical Note ・MCLK: It is System Clock input signal. It will input LRCLK, BCLK, SDATA that synchronizes with this clock that are 256 times of sampling frequency (256fs). ・LRCLK: It is L/R clock input signal. It corresponds to 32kHz / 44.1kHz / 48kHz with those clock (fs) that are same to the sampling frequency (fs) . The data of a left channel and a right channel for one sample is input to this section. ・BCLK: It is Bit Clock input signal. It is used for the latch of data in every one bit by sampling frequency’s 64 times sampling frequency (64fs). ・SDATA: It is Data input signal. It is amplitude data. The data length is different according to the resolution of the input digital audio data. It corresponds to 16/ 20/ 24 bit. 2 ●I S data format LRCLK 1/64fs Lch Rch BCLK SDATA 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 LSB MSB LSB MSB 32 clocks 2 Fig.31 I S Data Format 64fs, 24 bit Data 32 clocks LRCLK Lch Rch BCLK SDATA MSB 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 LSB MSB 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 LSB Fig.32 I2S Data Format 64fs, 20 bit Data Lch LRCLK Rch BCLK SDATA MSB 14 13 12 11 10 9 8 7 6 5 4 3 2 1 LSB MSB 14 13 12 11 10 9 8 7 6 5 4 3 2 1 LSB Fig.33 I2S Data Format 64fs, 16 bit Data The Low section of LRCLK becomes Lch, the High section of LRCLK becomes Rch. After changing LRCLK, second bit becomes MSB. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 13/34 2011.06 - Rev.A BD5451EFV ●Audio Interface format and timing Recommended timing and operating conditions (MCLK, BCLK, LRCLK, SDATA) 1/ f MCLK / Technical Note MCLK 1 / f LRCLK LRCLK 1/f BCLK BCLK Fig.34 Clock timing LRCLK tHD;LR tSU;LR BCLK tSU ; SD tHD ; SD SDATA Fig.35 Audio Interface timing (1) MCLK tHD ; BC tSU ; BC BCLK Fig.36 Audio Interface timing (2) Parameter 1 2 3 4 5 6 7 8 9 MCLK frequency LRCLK frequency BCLK frequency Setup time, LRCLK※1 Hold time, LRCLK※1 Setup time, SDATA Hold time, SDATA Setup time, BCLK※2 Hold time, BCLK※2 Symbol fMCLK fLRCLK fBCLK tSU;LR tHD;LR tSU;SD tHD;SD tSU;BC tHD;BC Limit Min. 8.192 32 2.048 20 20 20 20 3 7 Max. 12.288 48 3.072 － － － － － － Unit MHz kHz MHz ns ns ns ns ns ns ※1 This regulation is to keep rising edge of LRCK and rising edge of BCLK from overlapping. ※2 This regulation is to keep rising edge of MCLK and rising edge of BCLK from overlapping. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 14/34 2011.06 - Rev.A BD5451EFV ●Power supply start-up sequence Technical Note VCCA (14pin) VCCP1 (15, 16pin) VCCP2 (27, 28pin) ①Power up VCCA, VCCP1, VCCP2 simultaneously. t REG_G (12pin) FILA (11pin) REG3 (9pin) FILP (8pin) REG_G REG_3 FILA FILP t With VCC＞10V, waiting time unnecessary. RSTX (1pin) ②Set RSTX to High after power up. t MCLK (6pin) BCLK (5pin) LRCLK (4pin) SDATA (3pin) ③Degital audio data communication. t With VCC＞10V, there are no problem sending digital audio data at RSTX=L.. MUTEX (2pin) about20msec ④After RSTX=L→H wait more than 20msec to MUTEX=L→H. t Soft-start 21.5msec(fs=48kHz) Speaker output t www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 15/34 2011.06 - Rev.A BD5451EFV ●Power supply shut-down sequence Technical Note VCCA (14pin) VCCP1 (15, 16pin) VCCP2 (27, 28pin) ④Power down VCCA, VCCP1, VCCP2, simultaneously. t REG_G (11pin) FILP (12pin) REG3 (9pin) FILA (8pin) REG_G REG_3 FILA FILP t RSTX (1pin) ③Set RSTX to Low t MCLK BCLK LRCLK SDATA (6pin) (5pin) (4pin) (3pin) ②After stopping speaker output, turn off the transmission of digital audio signal. t With VCC＞10V, there are no problem sending digital audio data even by RSTX=L. MUTEX (2pin) ①Set MUTEX to Low. about 50msec t Soft-mute 21.5msec(fs=48kHz) Speaker output t www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 16/34 2011.06 - Rev.A BD5451EFV ●About the protection function Protection function Detecting condition Detecting & Releasing condition Technical Note PWM Output HiZ_Low (Latch) HiZ_Low (Latch) HiZ_Low ERROR Output L (Latch) L (Latch) Output short protection Detecting current = 10A (TYP.) PWM output Duty=0% or 100% 43msec(fs=48kHz) above fixed Chip temperature to be above 150℃ (TYP.) DC voltage protection in Detecting the speaker condition Detecting condition High temperature protection H Releasing Chip temperature to be below 120℃ (TYP.) condition Detecting condition Power supply voltage to be below 8V (TYP.) Normal operation HiZ_Low H Releasing Power supply voltage to be above 9V (TYP.) condition Detecting condition Power supply voltage to be above 21.5V(TYP.) Normal operation HiZ_Low H Releasing Power supply voltage to be below 20.5V(TYP.) condition Detecting condition No change to MCLK more than 1µsec (TYP.) or no change to BCLK more than 1µsec (TYP.) or no change to LRCLK more than 21µsec (at fs=48kHz.). Normal operation HiZ_Low H Normal operation Under voltage protection Over voltage Protection Clock stop protection Releasing Normal input to MCLK, BCLK and LRCLK. condition * * The ERROR pin is Nch open-drain output. Once an IC is latched, the circuit is not released automatically even after an abnormal status is removed. The following procedures ① or ② is available for recovery. ①After turning MUTEX terminal to Low(holding time to Low = 10msec(Min.)) turn back to High again. ②Restore power supply after dropping to power supply voltage Vcc＜3V(10msec (Min.) holding) which internal power on reset circuit activates. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 17/34 2011.06 - Rev.A BD5451EFV Technical Note 1) 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 MUTEX 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. Releasing method - ①After turning MUTEX terminal to Low(holding time to Low = 10msec(Min.)) turn back to High again. ②Restore power supply after dropping to power supply voltage Vcc＜3V(10msec (Min.) holding) which internal power on reset circuit activates. Short to VCC Release from short to VCC OUT1P (25,26 pin) OUT1N (22,23 pin) OUT2N (20,21 pin) OUT2P (17,18 pin) t PWM out ：IC latches with HiZ-Low. Over current Released from latch state . 10A(TYP .) t ERROR (10pin ) t 1µsec(TYP.) MUTEX(2pin) Latch release t 10msec(Min.) www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 18/34 2011.06 - Rev.A BD5451EFV Technical Note 2) Output short protection(Short to GND) This IC has the PWM output short protection circuit that stops the PWM output when the PWM output is short-circuited to GND due to abnormality. Detecting condition - It will detect when MUTEX pin is set High and the current that flows in the PWM output terminal becomes 10A(TYP.) or more. The PWM output instantaneously enters the state of HiZ-Low if detected, and IC does the latch. Releasing method – ①After turning MUTEX terminal to Low(holding time to Low = 10msec(Min.)) turn back to High again. ②Restore power supply after dropping to power supply voltage Vcc＜3V(10msec (Min.) holding) which internal power on reset circuit activates. Short to GND Release from short to GND OUT1P (25,26pin) OUT1N (22,23pin) OUT2P (17,18pin) OUT2N (20,21pin) t PWM out ：　IC latches with HiZ-Low. Released from latch state. Over current 10A(TYP.) t ERROR (10pin) １μsec(TYP.) MUTEX(2pin) t Latch release t １0msec(Min.) www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 19/34 2011.06 - Rev.A BD5451EFV Technical Note 3) 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 MUTEX 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. Releasing method – ①After turning MUTEX terminal to Low(holding time to Low = 10msec(Min.)) turn back to High again. ②Restore power supply after dropping to power supply voltage Vcc＜3V(10msec (Min.) holding) which internal power on reset circuit activates. PWM out locked duty=100% abnormal state. Abnormal state release. OUT1P (25, 26pin) OUT1N (22, 23pin) OUT2P (17, 18pin) OUT2N (20, 21pin) PWM output ：　IC latche with HiZ-Low. t Latch release state. Speaker output t Soft-start 21.5msec(fs=48kHz) ERROR (10pin) t MUTEX(2pin) Latch release t １0msec(Min.) www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 20/34 2011.06 - Rev.A BD5451EFV Technical Note 4) 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 MUTEX pin is set High and the temperature of the chip becomes 150℃(TYP.) or more. Speaker output turn MUTE immediately, when High temperature protection is detected. Releasing condition - It will release when MUTEX pin is set High and the temperature of the chip becomes 120℃ (TYP.) or less. The speaker output is outputted through a soft-start when released. Temperature of IC chip junction(℃) 150℃ 120℃ t OUT1P (25,26pin) OUT1N (22,23pin) OUT2P (17,18pin) OUT2N (20,21pin) HiZ-Low t Soft-start 21.5msec(fs=48KHz) Speaker output t ERROR (10pin) 3.3V t www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 21/34 2011.06 - Rev.A BD5451EFV Technical Note 5) 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 MUTEX pin is set High and the power supply voltage becomes lower than 8V.Speaker output turn MUTE immediately, when Under voltage protection is detected. Releasing condition – It will release when MUTEX pin is set High and the power supply voltage becomes more than 9V. The speaker output is outputted through a soft-start when released. VCCA (14pin) VCCP1 (15, 16pin) VCCP2 (27, 28pin) 9V 8V t OUT1P (25,26pin) OUT1N (22,23pin) OUT2P (17,18pin) OUT2N (20,21pin) HiZ-Low t Speaker output Soft-start 21.5msec(fs=48KHz) t ERROR (10pin) 3.3V t www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 22/34 2011.06 - Rev.A BD5451EFV Technical Note 6) Over 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 MUTEX pin is set High and the power supply voltage becomes more than 21.5V.Speaker output turn MUTE immediately, when over voltage protection is detected. Releasing condition – It will release when MUTEX pin is set High and the power supply voltage becomes lower than 20.5V. The speaker output is outputted through a soft-start when released. VCCA (14pin) VCCP1 (15, 16pin) VCCP2 (27, 28pin) 21V 19V t OUT1P (25,26pin) OUT1N (22,23pin) OUT2P (17,18pin) OUT2N (20,21pin) HiZ-Low t Speaker output Soft-start 21.5msec(fs=48KHz) t ERROR (10pin) 3.3V t www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 23/34 2011.06 - Rev.A BD5451EFV Technical Note 7-1) Clock stop protection(MCLK) This IC has the clock stop protection circuit that make the speaker output mute when the MCLK signal of the digital audio input stops. Detecting condition - It will detect when MUTEX pin is set High and the MCLK signal stops for about 1µsec or more. 21.5V. Speaker output turn MUTE immediately, clock stop protection is detected. Releasing condition - It will release when MUTEX pin is set High and the MCLK signal returns to the normal clock operation. The speaker output is outputted through a soft-start when released. Clock stop Clock recover MCLK (6pin) t Protection start with about 1µ clock stop. OUT1P (25,26pin) OUT1N (22,23pin) OUT2N (20,21pin) OUT2P (17,18pin) HiZ - Low t Soft - start 21.5msec (fs=48 kHz ) Speaker output t ERROR (10pin) 3.3V t www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 24/34 2011.06 - Rev.A BD5451EFV Technical Note 7-2) Clock stop protection(BCLK) This IC has the clock stop protection circuit that make the speaker output mute when the BCLK signal of the digital audio input stops. Detecting condition - It will detect when MUTEX pin is set High and the BCLK signal stops for about 1µsec or more. 21.5V.Speaker output turn MUTE immediately, when clock stop protection is detected. Releasing condition - It will release when MUTEX pin is set High and the BCLK signal returns to the normal clock operation. The speaker output is outputted through a soft-start when released. Clock stop Clock recover BCLK (5pin) t Protection start with about 1μ sec clock stop . OUT1P (25,26pin) OUT1N (22,23pin) OUT2N (20,21pin) OUT2P (17,18pin) HiZ - Low t Soft - start 21.5msec ( fs= 48kHz) Speaker output t ERROR(10pin) 3.3V t www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 25/34 2011.06 - Rev.A BD5451EFV Technical Note 7-3) Clock stop protection (LRCLK) This IC has the clock stop protection circuit that make the speaker output mute when the LRCLK signal of the digital audio input stops. Detecting condition - It will detect when MUTEX pin is set High and the LRCLK signal stops for about 21µsec (at fs=48kHz) or more. Speaker output turn MUTE immediately, when clock stop protection is detected. Releasing condition - It will release when MUTEX pin is set High and the LRCLK signal returns to the normal clock operation. The speaker output is outputted through a soft-start when released. Clock stop Clock recover LRCLK (4pin) t Protection start with about 21us (fs=48kHz) clock stop. OUT1P (25,26pin) OUT1N (22,23pin) OUT2P (17,18pin) OUT2N (20,21pin) HiZ-Low t Soft-start 21.5msec(fs=48kHz) Speaker output t ERROR (10pin) 3.3V t www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 26/34 2011.06 - Rev.A BD5451EFV ●Application Circuit Example (Stereo BTL Output, RL=8Ω, VCC=10V～16V, Po=～15W) Technical Note RSTX μ-con MUTEX 0 SDATA 0 LRCLK 0 0 BCLK (NOP) MCLK 1 2 3 4 5 6 7 Control I/F Driver FET 1P IS I/F 2 28 VCCP1 27 26 25 24 GNDP1 23 22 21 Driver FET 2N Feedback VCCP1: 10V～16V L26 10μH C26 0.1μF C27 10μF GNDP1 GNDP1 L23 10μH C23 0.1μF SP 1ch (8Ω) Digital Audio Source Feedback Feedback Driver FET 1N GNDA FILP REG3 ×8 Over Sampling Digital Filter PWM Modulator GNDA C8 0.1μF C9 0.1μF R10 100kΩ C11 0.1μF C12 0.1μF 8 9 10 11 L20 10μH GNDP2 C20 0.1μF C15 10μF GNDP2 L17 10μH C17 0.1μF SP 2ch (8Ω) 20 19 GNDP2 18 17 16 VCCP2 15 VCCP2: 10V～16V ERROR GNDA REG_G Feedback 12 13 FILA Gain Selector Driver FET 2P Output Short Protection Output DC Voltage Protection Under Voltage Protection Over Voltage Protection Clock Stop Protection High Temperature Protection C14 10μF VCCA: 10V～16V 14 VCCA ●BOM list (Stereo BTL Output, RL=8Ω, VCC=10V～16V, Po=～15W) Parts IC Inductor Resistor Capacitor Parts No. U1 L17, L20, L23, L26 R10 C14, C15, C27 C8, C9, C11, C12 C17, C20, C23, C26 Value － Company ROHM TOKO ROHM MURATA Product No. BD5451EFV B1047DS-100M=3P MCR03EZPJ104 GRM31CB11E106KA75L GRM188B11A104KA92D GRM188B11E104KA01D Rated Voltage － - Tolerance － Size 9.7mm×6.4mm 7.6mm×7.6mm 1.6mm×0.8mm 3.2mm×1.6mm 1.6mm×0.8mm 1.6mm×0.8mm 10μH 100kΩ 10µF 0.1µF 0.1µF (±20%) J(±1%) B(±10%) B(±10%) B(±10%) 1/10W 25V 10V 25V As return of current regenerated by back EMF of output coil happens, take steps such as putting capacitor between power supply and GND as a electric pathway for the regenerated current. Be sure that there is no problem with each property such as emptied capacity at lower temperature regarding electrolytic capacitor to decide capacity value. If the connected power supply does not have sufficient current absorption capacity, regenerative current will cause the voltage on the power supply line to rise, which combined with the product and its peripheral circuitry may exceed the absolute maximum ratings. It is recommended to implement a physical safety measure such as the insertion of a voltage clamp diode between the power supply and GND pins. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 27/34 2011.06 - Rev.A BD5451EFV ●Application Circuit Example (Monaural BTL Output, RL=8Ω, VCC=10V～16V, Po=～15W) Technical Note RSTX μ-con MUTEX 0 SDATA 0 LRCLK Digital Audio Source 0 0 BCLK (NOP) 1 2 3 4 5 6 7 Control I/F Driver FET 1P IS I/F 2 28 VCCP1 27 26 25 24 GNDP1 23 22 21 Driver FET 2N Feedback VCCP1: 10V～16V L26 10μH C26 0.1μF C27 10μF GNDP1 GNDP1 L23 10μH C23 0.1μF SP 1ch (8Ω) Feedback Feedback MCLK Driver FET 1N GNDA FILP REG3 ×8 Over Sampling Digital Filter PWM Modulator GNDA C8 0.1μF C9 0.1μF R10 100kΩ C11 0.1μF C12 0.1μF 8 9 10 11 20 GNDP1 19 GNDP2 18 17 16 VCCP2 15 ERROR GNDA REG_G Feedback 12 13 FILA Gain Selector Driver FET 2P Output Short Protection Output DC Voltage Protection Under Voltage Protection Over Voltage Protection Clock Stop Protection High Temperature Protection C14 10μF VCCA: 10V～16V 14 VCCA ●BOM list (Monaural BTL Output, RL=8Ω, VCC=10V～16V, Po=～15W) Parts IC Inductor Resistor Capacitor Parts No. U1 L23, L26 R10 C14, C27 C8, C9, C11, C12 C23, C26 Value － 10μH 100kΩ 10µF 0.1µF 0.1µF MURATA Company ROHM TOKO ROHM Product No. BD5451EFV B1047DS-100M=3P MCR03EZPJ104 GRM31CB11E106KA75L GRM188B11A104KA92D GRM188B11E104KA01D Rated Voltage － 1/10W 25V 10V 25V Tolerance － (±20%) F(±1%) B(±10%) B(±10%) B(±10%) Size 9.7mm×6.4mm 7.6mm×7.6mm 1.6mm×0.8mm 3.2mm×1.6mm 1.6mm×0.8mm 1.6mm×0.8mm As return of current regenerated by back EMF of output coil happens, take steps such as putting capacitor between power supply and GND as a electric pathway for the regenerated current. Be sure that there is no problem with each property such as emptied capacity at lower temperature regarding electrolytic capacitor to decide capacity value. If the connected power supply does not have sufficient current absorption capacity, regenerative current will cause the voltage on the power supply line to rise, which combined with the product and its peripheral circuitry may exceed the absolute maximum ratings. It is recommended to implement a physical safety measure such as the insertion of a voltage clamp diode between the power supply and GND pins. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 28/34 2011.06 - Rev.A BD5451EFV Technical Note ●Application Circuit Example (Stereo BTL Output, RL=8Ω, VCC=16V～18V, Po=～20W) ※To prevent going over absolute maximum rating by the leap out of power supply and the linking of PWM output wave form, please provide countermeasure shown below diagram (dot-line ※) when using at Vcc＞16V. RSTX μ-con MUTEX 0 SDATA 0 LRCLK Digital Audio Source 0 0 BCLK (NOP) 1 2 3 4 5 6 7 Control I/F Driver FET 1P IS I/F 2 28 VCCP1 27 ※ 26 25 24 GNDP1 23 ※ 22 21 Driver FET 2N Feedback C26B 680pF L26 10μH C26 0.1μF Feedback Feedback C27 10μF GNDP1 GNDP1 R26 6.8Ω R23 6.8Ω GNDP1 C23B 680pF L23 VCC: 16V～18V C14B 220μF MCLK Driver FET 1N GNDA FILP REG3 ×8 Over Sampling Digital Filter PWM Modulator C23 0.1μF 10μH SP 1ch (8Ω) GNDA C8 0.1μF C9 0.1μF R10 100kΩ 8 9 10 11 GND 20 GNDP2 19 GNDP2 18 17 ※ 16 VCCP2 15 C15 10μF GNDP2 C20B 680pF R20 6.8Ω L20 10μH C20 0.1μF ERROR C11 0.1μF C12 0.1μF GNDA REG_G Feedback 12 13 14 FILA Gain Selector Driver FET 2P Output Short Protection Output DC Voltage Protection Under Voltage Protection Over Voltage Protection Clock Stop Protection High Temperature Protection R17 6.8Ω GNDP2 C17B 680pF L17 C17 0.1μF 10μH SP 2ch (8Ω) C14 10μF VCCA ●BOM list Parts IC (Stereo BTL Output, RL=8Ω, VCC=16V～18V, Po=～20W) Parts No. U1 L17, L20, L23, L26 R10 R17, R20, R23, R26 C14, C15, C27 C8, C9, C11, C12 C17, C20, C23, C26 C17,B C20B, C23B, C26B Value － 10μH 100kΩ 6.8Ω 10µF 0.1µF 0.1µF 680pF 220μF Panasonic MURATA Company ROHM TOKO ROHM ROHM Product No. BD5451EFV B1047DS-100M=3P MCR03EZPJ104 MCR03EZPFL6R80 GRM31CB11E106KA75L GRM188B11A104KA92D GRM188B11E104KA01D GRM188B11E681KA01 ECA1EMH221 Rated Voltage － 1/10W 1/10W 25V 10V 25V 25V 25V Tolerance － (±20%) J(±5%) F(±1%) B(±10%) B(±10%) B(±10%) B(±10%) ±20% Size 9.7mm×6.4mm 7.6mm×7.6mm 1.6mm×0.8mm 1.6mm×0.8mm 3.2mm×1.6mm 1.6mm×0.8mm 1.6mm×0.8mm 1.6mm×0.8mm φ8mm×11.5mm Inductor Resistor Capacitor Electrolytic Capacitor C14B As return of current regenerated by back EMF of output coil happens, take steps such as putting capacitor between power supply and GND as a electric pathway for the regenerated current. Be sure that there is no problem with each property such as emptied capacity at lower temperature regarding electrolytic capacitor to decide capacity value. If the connected power supply does not have sufficient current absorption capacity, regenerative current will cause the voltage on the power supply line to rise, which combined with the product and its peripheral circuitry may exceed the absolute maximum ratings. It is recommended to implement a physical safety measure such as the insertion of a voltage clamp diode between the power supply and GND pins. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 29/34 2011.06 - Rev.A BD5451EFV Technical Note ●Application Circuit Example (Monaural BTL Output, RL=8Ω, VCC=16V～18V, Po=～20W) ※To prevent going over absolute maximum rating by the leap out of power supply and the linking of PWM output wave form, please provide countermeasure shown below diagram (dot-line ※) when using at Vcc＞16V. RSTX μ-con MUTEX 0 SDATA 0 LRCLK Digital Audio Source 0 0 BCLK (NOP) 1 2 3 4 5 6 7 Control I/F Driver FET 1P IS I/F 2 28 VCCP1 27 ※ 26 25 24 GNDP1 23 ※ 22 21 Driver FET 2N Feedback C14B 220μF C27 10μF C26B 680pF R26 6.8Ω R23 6.8Ω L26 10μH C26 0.1μF Feedback Feedback MCLK Driver FET 1N GNDA FILP REG3 ×8 Over Sampling Digital Filter PWM Modulator GNDP1 GNDP1 GNDP1 C23B 680pF C23 0.1μF SP 1ch (8Ω) L23 10μH VCC: 16V～18V GNDA C8 0.1μF C9 0.1μF R10 100kΩ C11 0.1μF C12 0.1μF 8 9 10 11 GND 20 GNDP1 19 GNDP2 18 17 16 VCCP2 15 ERROR GNDA REG_G Feedback 12 13 14 FILA Gain Selector Driver FET 2P Output Short Protection Output DC Voltage Protection Under Voltage Protection Over Voltage Protection Clock Stop Protection High Temperature Protection C14 10μF VCCA ●BOM list Parts IC (Monaural BTL Output, RL=8Ω, VCC=16V～18V, Po=～20W) Parts No. U1 L23, L26 R10 R23, R26 C14, C27 Value － 10μH 100kΩ 6.8Ω 10µF 0.1µF 0.1µF 680pF 220μF Panasonic MURATA Company ROHM TOKO ROHM Product No. BD5451EFV B1047DS-100M=P3 MCR03EZPJ104 MCR03EZPFL6R80 GRM31CB31E106KA75L GRM188B11A104KA92D GRM188B11E104KA01D GRM188B11E681KA01 ECA1EMH221 Rated Voltage － 1/10W 1/10W 25V 10V 25V 25V 25V Tolerance － (±20%) J(±5%) F(±1%) B(±10%) B(±10%) B(±10%) B(±10%) ±20% Size 9.7mm×6.4mm 7.6mm×7.6mm 1.6mm×0.8mm 1.6mm×0.8mm 3.2mm×1.6mm 1.6mm×0.8mm 1.6mm×0.8mm 1.6mm×0.8mm φ8mm×11.5mm Inductor Resistor Capacitor C8, C9, C11, C12 C23, C26 C23B, C26B Electrolytic Capacitor C14B As return of current regenerated by back EMF of output coil happens, take steps such as putting capacitor between power supply and GND as a electric pathway for the regenerated current. Be sure that there is no problem with each property such as emptied capacity at lower temperature regarding electrolytic capacitor to decide capacity value. If the connected power supply does not have sufficient current absorption capacity, regenerative current will cause the voltage on the power supply line to rise, which combined with the product and its peripheral circuitry may exceed the absolute maximum ratings. It is recommended to implement a physical safety measure such as the insertion of a voltage clamp diode between the power supply and GND pins. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 30/34 2011.06 - Rev.A BD5451EFV Technical Note ●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 256kHz (fs=32kHz) to 384kHz (fs=48kHz) in the output PWM signals, the high-frequency components must be appropriately removed. This section takes an example of an LC type LPF shown below, in which coil L and capacitor C compose a differential filter with an attenuation property of -12dB / oct. A large part of switching currents flow to capacitor C, and only a small part of the currents flow to speaker RL. This filter reduces unwanted emission this way. In addition, coil L and capacitor Cg compose a filter against in-phase components, reducing unwanted emission further. 25,26 or 17,18 L C C 22,23 or 20,21 RL L Following presents output LC filter constants with typical load impedances. RL 4Ω 6Ω 8Ω L 10µH 10µH 10µH C 0.47µF 0.15µF 0.1µF Use coils with a low direct-current resistance and with a sufficient margin of allowable currents. A high direct-current resistance causes power losses. In addition, select a closed magnetic circuit type product in normal cases to prevent unwanted emission. Use capacitors with a low equivalent series resistance, and good impedance characteristics at high frequency ranges (100kHz or higher). Also, select an item with sufficient withstand voltage because flowing massive amount of high-frequency currents is expected. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 31/34 2011.06 - Rev.A BD5451EFV ●Notes for use Technical Note 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. 2 ) Power supply lines As return of current regenerated by back EMF of output coil happens, take steps such as putting capacitor between power supply and GND as a electric pathway for the regenerated current. Be sure that there is no problem with each property such as emptied capacity at lower temperature regarding electrolytic capacitor to decide capacity value. If the connected power supply does not have sufficient current absorption capacity, regenerative current will cause the voltage on the power supply line to rise, which combined with the product and its peripheral circuitry may exceed the absolute maximum ratings. It is recommended to implement a physical safety measure such as the insertion of a voltage clamp diode between the power supply and GND pins. 3 ) GND potential(Pin 7, 19, 24). Any state must become the lowest voltage about GND terminal and VSS terminal. 4 ) Input terminal The parasitic elements are formed in the IC because of the voltage relation. The parasitic element operating causes the wrong operation and destruction. Therefore, please be careful so as not to operate the parasitic elements by impressing to input terminals lower voltage than GND and VSS. Please do not apply the voltage to the input terminal when the power-supply voltage is not impressed. 5 ) Setting of heat Use a thermal design that allows for a sufficient margin in light of the power dissipation (Pd) in actual operating conditions. This IC exposes its frame of the backside of package. Note that this part is assumed to use after providing heat dissipation treatment to improve heat dissipation efficiency. Try to occupy as wide as possible with heat dissipation pattern not only on the board surface but also the backside. Class D speaker amplifier is high efficiency and low heat generation by comparison with conventional Analog power amplifier. However, In case it is operated continuously by maximum output power, Power dissipation (Pdiss) may exceed package dissipation. Please consider about heat design that Power dissipation (Pdiss) does not exceed Package dissipation (Pd) in average power (Poav). (Tjmax : Maximum junction temperature=150℃, Ta : Peripheral temperature[℃], θja : Thermal resistance of package[℃/W], Poav: Average power[W], η: Efficiency) Package dissipation: Pd (W) = (Tjmax - Ta)/θja Power dissipation : Pdiss(W)= Poav ×(1/η- 1) 6 ) Actions in strong magnetic field Use caution when using the IC in the presence of a strong magnetic field as doing so may cause the IC to malfunction. 7 ) Thermal shutdown circuit This product is provided with a built-in thermal shutdown circuit. When the thermal shutdown circuit operates, the output transistors are placed under open status. The thermal shutdown circuit is primarily intended to shut down the IC avoiding thermal runaway under abnormal conditions with a chip temperature exceeding Tjmax = 150℃. 8 ) Shorts between pins and misinstallation When mounting the IC on a board, pay adequate attention to orientation and placement discrepancies of the IC. If it is misinstalled and the power is turned on, the IC may be damaged. It also may be damaged if it is shorted by a foreign substance coming between pins of the IC or between a pin and a power supply or a pin and a GND. 9 ) Power supply on/off (Pin 14, 15, 16, 27, 28) In case power supply is started up, RSTX (Pin 1) and MUTEX (Pin 2) always should be set Low. And in case power supply is shut down, it should be set Low likewise. Then it is possible to eliminate pop noise when power supply is turned on/off. And also, all power supply terminals should start up and shut down together. 10 ) ERROR terminal(Pin 10) A error flag is outputted when Output short protection and DC voltage protection in the speaker are operated. These flags are the function which the condition of this product is shown in. 11) Precautions for Spealer-setting If the impedance characteristics of the speakers at high-frequency range while increase rapidly, the IC might not have stable-operation in the resonance frequency range of the LC-filter. Therefore, consider adding damping-circuit, etc., depending on the impedance of the speaker. Notes about the phase of MCLK (Pin6) and BCLK (Pin5) If the rising edge of MCLK (Pin6) and BCLK (Pin5) becomes simultaneous, noise or sound shutdown may occur. Please cope with it, when the rising edge of MCLK and BCLK becomes simultaneous. (Example: Insert RC filter in BCLK) 12) www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 32/34 2011.06 - Rev.A BD5451EFV ●Package outline (HTSSOP-B28) Technical Note BD5451EFV Lot No. (UNIT: mm) PKG: HTSSOP-B28 Drawing No: EX199-5002-1 ●Allowable Power Dissipation 6 HTSSOP-B28 Package PCB② 4.7W 5 Power dissipation :Pd (W) 4 PCB① 3.3W 3 2 1 0 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 A mbient temperature :Ta (°C) 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. PCB①: 2-layer board(back copper foil size: 70mm×70mm)，θja=37.9℃/W PCB②: 4-layer board(back copper foil size: 70mm×70mm)，θja=26.6℃/W www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 33/34 2011.06 - Rev.A BD5451EFV ●Ordering part number Technical Note B D 5 Part No. 4 5 1 E F V - E 2 Part No. Package EFV: HTSSOP-B28 Packaging and forming specification E2: Embossed tape and reel HTSSOP-B28 9.7±0.1 (MAX 10.05 include BURR) (5.5) 28 15 Tape +6° 4° −4° 0.5±0.15 1.0±0.2 Embossed carrier tape (with dry pack) 2500pcs E2 The direction is the 1pin of product is at the upper left when you hold Quantity Direction of feed 6.4±0.2 4.4±0.1 (2.9) ( reel on the left hand and you pull out the tape on the right hand ) 1 14 0.625 1.0MAX 1PIN MARK S +0.05 0.17 -0.03 0.85±0.05 0.08±0.05 0.08 S 0.65 +0.05 0.24 -0.04 0.08 M 1pin Direction of feed (Unit : mm) Reel ∗ Order quantity needs to be multiple of the minimum quantity. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 34/34 2011.06 - Rev.A Notice Notes No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. The content specified herein is subject to change for improvement without notice. The content specified herein is for the purpose of introducing ROHM's products (hereinafter "Products"). If you wish to use any such Product, please be sure to refer to the specifications, which can be obtained from ROHM upon request. Examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the Products. The peripheral conditions must be taken into account when designing circuits for mass production. Great care was taken in ensuring the accuracy of the information specified in this document. However, should you incur any damage arising from any inaccuracy or misprint of such information, ROHM shall bear no responsibility for such damage. The technical information specified herein is intended only to show the typical functions of and examples of application circuits for the Products. ROHM does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by ROHM and other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. The Products specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices). The Products specified in this document are not designed to be radiation tolerant. While ROHM always makes efforts to enhance the quality and reliability of its Products, a Product may fail or malfunction for a variety of reasons. Please be sure to implement in your equipment using the Products safety measures to guard against the possibility of physical injury, fire or any other damage caused in the event of the failure of any Product, such as derating, redundancy, fire control and fail-safe designs. ROHM shall bear no responsibility whatsoever for your use of any Product outside of the prescribed scope or not in accordance with the instruction manual. The Products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuelcontroller or other safety device). ROHM shall bear no responsibility in any way for use of any of the Products for the above special purposes. If a Product is intended to be used for any such special purpose, please contact a ROHM sales representative before purchasing. If you intend to export or ship overseas any Product or technology specified herein that may be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to obtain a license or permit under the Law. Thank you for your accessing to ROHM product informations. More detail product informations and catalogs are available, please contact us. ROHM Customer Support System http://www.rohm.com/contact/ www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. R1120A