ROHM BD5451EFV

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.
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1/34
2011.06 - Rev.A
Technical Note
BD5451EFV
●Absolute maximum ratings (Ta=25℃)
Parameter
Symbol
Ratings
Unit
Supply voltage
VCC
22
V
Pin 14, 15, 16, 27, 28
3.3
W
※3
Power dissipation
Pd
4.7
W
※4
VIN
-0.3 ～ 4.5
V
Pin 1 ～ 6, 13
※1
Terminal voltage 1
VPIN1
-0.3 ～ 7.0
V
Pin 8, 11, 12
※1
Terminal voltage 2
VPIN2
-0.3 ～ 4.5
V
Pin 9
※1
Terminal voltage 3
VPIN3
22
V
Pin 17, 18, 20 ～ 23, 25, 26 ※1
Open-drain terminal voltage
VERR
-0.3 ～ 22
V
Pin 10
Operating temperature range
Topr
-25 ～ +85
℃
Storage temperature range
Tstg
-55 ～ +150
℃
Maximum junction temperature
Tjmax
+150
℃
Input voltage
Parameter
※1 ※2
※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
Symbol
Ratings
Unit
Supply voltage
VCC
10 ～ 18
V
Minimum load impedance
RL
3.6
Parameter
Pin 14, 15, 16, 27, 28
※1 ※2
VCC ≦ 18V
※5
VCC ≦ 16V
※5
Ω
3.2
※5 Do not, however exceed Pd.
※ No radiation-proof design.
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2/34
2011.06 - Rev.A
Technical Note
BD5451EFV
●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
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
ICC1
-
0.1
0.2
mA
ICC２
-
15
25
mA
ICC3
-
50
80
mA
VERR
-
-
0.8
V
Regulator output voltage 1
VREG_G
4.7
5.0
5.3
V
Pin 11
Regulator output voltage 2
VREG_3
3.0
3.3
3.6
V
Pin 9
High level input voltage
VIH
2.0
-
3.3
V
Pin 1 ～ 6, 13
Low level input voltage
VIL
0
-
0.9
V
Pin 1 ～ 6, 13
Input current
(Input pull-down terminal)
IIH
50
66
95
μA
Maximum output power 1
PO1
-
10
-
W
Maximum output power 2
PO２
-
15
-
W
GV20
19
20
21
GV26
25
26
THD
-
CT
Pin 1 ～ 6, 13, VIN = 3.3V
Speaker Output
THD+n=10%
GAIN=20dB
VCC=15V, THD+n=10%
GAIN =26dB
※6
dB
PO=1W, Gain=20dB
※6
27
dB
PO=1W, Gain=26dB
※6
0.07
-
%
PO=1W, BW=20～20kHz
※6
66
80
-
dB
PO=1W, BW=IHF-A
※6
PSRR
-
70
-
dB
Vropple=1Vrms, f= 1kHz
※6
VNO
-
100
200
μ
Vrms
-∞dBFS, BW=IHF-A
※6
fPWM1
-
256
-
kHz
fs=32kHz
※6
fPWM2
-
352.8
-
kHz
fs=44.1kHz
※6
fPWM3
-
384
-
kHz
fs=48kHz
※6
※6
Voltage gain
Total harmonic distortion
Crosstalk
PSRR
Output noise voltage
(Sampling mode)
PWM sampling frequency
※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.
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3/34
2011.06 - Rev.A
Technical Note
BD5451EFV
●Electrical characteristic curves (VCC=12V, Ta=25℃, RL=8Ω, Gain=26dB, fin=1kHz, fs=48kHz)
Measured by ROHM designed 4 layer board.
80
0.20
RSTX=MUTEX=L
RL=8Ω
No signal
0.18
0.16
RSTX=H
RL=8Ω
No signal
70
MUTEX=H
60
0.14
50
ICC [mA]
ICC [mA]
0.12
0.10
0.08
40
30
0.06
MUTEX=L
20
0.04
10
0.02
0.00
0
8
10
12
14
VCC [V]
16
18
20
8
Fig.1
Current consumption - Power supply voltage
100
RL=8Ω
90
12
14
VCC [V]
16
18
20
Fig.2
Current consumption - Power supply voltage
3.5
RL=4Ω
RL=6Ω
3
RL=4Ω
80
2.5
70
RL=6Ω
60
ICC [A]
EFFICIENCY [%]
10
50
40
30
2
RL=8Ω
1.5
1
VCC=12V
Gain=20dB
fin=1KHz
20
10
VCC=12V
Gain=20dB
fin=1KHz
0.5
0
0
0
2
4
6
8
10
12
OUTPUT POWER [W/CH]
14
16
18
0
20
Fig.3
Efficiency - Output power
5ms/div
Speaker output
2
6
8
10
12
OUTPUT POWER [W/CH]
14
16
18
20
Fig.4
Current consumption - Output power
5ms/div
VCC=12V
RL=8Ω
Po=1W
fin=500Hz
Speaker output
2V/div
VCC=12V
RL=8Ω
Po=1W
fin=500Hz
2V/div
MUTEX(2pin)
MUTEX(2pin)
5V/div
5V/div
Fig.5
Wave form when releasing soft-mute
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© 2011 ROHM Co., Ltd. All rights reserved.
4
Fig.6
Wave form when activating soft-mute
4/34
2011.06 - Rev.A
Technical Note
BD5451EFV
●Electrical characteristics (VCC=12V, Gain=26dB, fin=1kHz, fs=48kHz)
Measured by ROHM designed 4 layer board.
25
3
THD+N=10%
RL=8Ω
2.5
20
VCC=15V
RL=8Ω
15
VCC=18V
VCC=12V
2
ICC [A]
OUTPUT POWER [W/CH]
THD+N=1%
1.5
10
1
0.5
5
0
0
10
20
30
40
50
60
0
8
10
12
14
VCC [V]
16
18
TOTAL OUTPUT POWER [W]
20
Fig.7
Output power – Power supply voltage
Fig.8
Current consumption - Output power
30
4
THD+N=10%
RL=6Ω
25
THD+N=1%
VCC=15V
3
20
VCC=12V
2.5
ICC [A ]
OUTPUT POWER [W/CH]
VCC=18V
RL=6Ω
3.5
15
2
1.5
10
1
0.5
5
0
0
0
8
10
12
14
VCC [V]
16
18
10
20
Fig.9
Output power – Power supply voltage
20
30
40
TOTAL OUTPUT POWER [W]
50
60
Fig.10
Current consumption - Output power
40
5
THD+N=10%
RL=4Ω
35
VCC=15V
4
30
THD+N=1%
VCC=18V
VCC=12V
3.5
25
3
IC C [A ]
OUTPUT POWER [W/CH]
4.5
20
2.5
2
15
1.5
10
1
0.5
5
0
0
0
8
10
12
14
VCC [V]
16
18
20
Fig.11
Output power – Power supply voltage
10
20
30
40
TOTAL OUTPUT POWER [W]
50
60
Fig.12
Current consumption - Output power
※Dotted line means internal dissipation is over package power.
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5/34
2011.06 - Rev.A
Technical Note
BD5451EFV
●Electrical characteristic curves(VCC=12V, Ta=25℃, RL=8Ω, Gain=20dB, fin=1kHz, fs=48kHz)
Measured by ROHM designed 4layer board.
0
30
-10
No signal
-20
-40
24
VOLTAGE GAIN [dB]
26
-50
NOISE FFT [dBV]
Po=1W
28
-30
-60
-70
-80
-90
22
20
18
-100
16
-110
14
-120
12
-130
-140
10
10
100
1k
FREQUENCY [Hz]
10k
100k
10
100
Fig.13
FFT of output noise voltage
1k
FREQUENCY [Hz]
10k
100k
Fig.14
Voltage gain - Frequency
100
100
BW=20~20KHz
Po=1W
BW=20~20KHZ
6KHZ
THD+N [%]
THD+N [%]
10
10
1KHZ
1
1
0.1
0.1
100HZ
0.01
0.01
0.1
1
10
100
0.01
10
OUTPUT POWER [W/CH]
Fig.15
THD+N – Output power
1k
FREQUENCY [Hz]
10k
100k
Fig.16
THD+N – Frequency
0
0
-10
BW=20~20KHz
Po=1W
-10
BW=20~20KHZ
-20
-20
-30
-30
CROSS-TALK [dB]
CROSS-TALK[dB]
100
-40
-50
-60
-70
-40
-50
-60
-70
-80
-80
-90
-90
-100
-100
0.01
0.1
1
OUTPUT POWER [W/CH]
10
100
10
Fig.17
Crosstalk – Output power
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© 2011 ROHM Co., Ltd. All rights reserved.
100
1k
FREQUENCY [Hz]
10k
100k
Fig.18
Crosstalk – Frequency
6/34
2011.06 - Rev.A
Technical Note
BD5451EFV
●Electrical characteristic curves(VCC=12V, Ta=25℃, RL=6Ω, Gain=20dB, fin=1kHz, fs=48kHz)
Measured by ROHM designed 4layer board
0
-10
30
No signal
-20
28
-30
26
VOLTAGE GAIN [dB]
-40
NOISE FFT [dBV]
-50
-60
-70
-80
-90
-100
24
22
20
18
16
-110
14
-120
12
-130
Po=1W
10
-140
10
100
1k
FREQUENCY [Hz]
10k
10
100k
100
1k
Fig.19
FFT of output noise voltage
100
BW=20~20KHz
Po=1W
BW=20~20KHZ
10
6KHZ
1KHZ
1
THD+N [%]
THD+N [%]
100k
Fig.20
Voltage gain - Frequency
100
10
10k
FREQUENCY [Hz]
1
0.1
0.1
100HZ
0.01
0.01
0.1
1
10
100
0.01
10
OUTPUT POWER [W/CH]
Fig.21
THD+N – Output power
1k
FREQUENCY [Hz]
10k
100k
Fig.22
THD+N – Frequency
0
0
BW=20~20KHZ
-10
-20
-20
-30
-30
-40
-50
-60
-40
-50
-60
-70
-70
-80
-80
-90
-90
-100
-100
0.01
0.1
1
OUTPUT POWER [W/CH]
10
100
10
Fig.23
Crosstalk – Output power
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© 2011 ROHM Co., Ltd. All rights reserved.
BW=20~20KHz
Po=1W
-10
CROSS-TALK [dB]
CROSS-TALK [dB]
100
100
1k
FREQUENCY [Hz]
10k
100k
Fig.24
Crosstalk – Frequency
7/34
2011.06 - Rev.A
Technical Note
BD5451EFV
●Electrical characteristic curves(VCC=12V, Ta=25℃, RL=4Ω, Gain=20dB, fin=1kHz, fs=48kHz)
Measured by ROHM designed 4layer board
0
30
-10
28
No signal
-20
26
-40
24
VOLTAGE GAIN [dB]
-30
NOISE FFT [dBV]
-50
-60
-70
-80
-90
Po=1W
22
20
18
-100
16
-110
14
-120
12
-130
-140
10
10
100
1k
FREQUENCY [Hz]
10k
100k
10
100
Fig.25
FFT of output noise voltage
1k
FREQUENCY [Hz]
100
BW=20~20KHz
Po=1W
BW=20~20KHZ
THD+N [%]
100k
Fig.26
Voltage gain - Frequency
100
10
10k
10
6KHZ
THD+N [%]
1KHZ
1
0.1
1
0.1
100HZ
0.01
0.01
0.1
1
10
0.01
100
10
OUTPUT POWER [W/CH]
Fig.27
THD+N – Output power
10k
100k
0
BW=20~20KHZ
BW=20~20KHz
Po=1W
-10
-20
-20
-30
-30
CROSS-TALK [dB]
CROSS-TALK [dB]
1k
FREQUENCY [Hz]
Fig.28
THD+N – Frequency
0
-10
-40
-50
-60
-40
-50
-60
-70
-70
-80
-80
-90
-100
0.01
100
-90
-100
0.1
1
OUTPUT POWER [W/CH]
10
100
10
Fig.29
Crosstalk – Output power
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© 2011 ROHM Co., Ltd. All rights reserved.
100
1k
FREQUENCY [Hz]
10k
100k
Fig.30
Crosstalk – Frequency
8/34
2011.06 - Rev.A
Technical Note
BD5451EFV
●Pin configuration and Block diagram
RSTX
1
MUTEX 2
SDATA
3
LRCLK
4
BCLK
5
VCCP1
27 VCCP1
Driver
FET
1P
I2S
I/F
6
GNDA
7
GNDA
FILP
8
FILP
×8 Over
Sampling
Digital
Filter
21 OUT2N
Driver
FET
2N
REG_G
Gain
Selector
VCCA 14
VCCA
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20 OUT2N
19 GNDP2
GNDP2
Feedback
GNDA
GAIN 13
23 OUT1N
22 OUT1N
Feedback
FILA
24 GNDP1
GNDP1
PWM
Modulator
REG3
FILA 12
25 OUT1P
Feedback
ERROR 10
REG_G 11
26 OUT1P
Feedback
Driver
FET
1N
MCLK
REG3 9
28 VCCP1
Control
I/F
18 OUT2P
Driver
FET
2P
Output Short Protection
Output DC Voltage Protection
Under Voltage Protection
Over Voltage Protection
Clock Stop Protection
High Temperature Protection
9/34
17 OUT2P
16 VCCP2
VCCP2
15 VCCP2
2011.06 - Rev.A
Technical Note
BD5451EFV
●Pin function explanation (Provided pin voltages are typ. Values)
Pin No.
Pin name
Pin voltage
Pin explanation
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
MUTEX
3
4
5
6
SDATA
LRCLK
BCLK
MCLK
12
GAIN
7
GNDA
Speaker output mute control pin
H: Mute OFF
L: Mute ON
0V
14
2, 3, 4
5, 6, 13
Digital audio signal input pin
50K
7
Gain setting terminal
L: 20dB
H: 26dB
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
Error flag pin
10
ERROR
3.3V
Please connect pull-up resister.
500
10
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
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10/34
2011.06 - Rev.A
Technical Note
BD5451EFV
Pin No.
Pin name
Pin voltage
Pin explanation
Internal equivalence circuit
14
50K
Bias pin for PWM signal.
12
FILA
2.5V
Please connect the capacitor.
12
50K
7
14
VCCA
Vcc
15,16
VCCP2
Vcc
17,18
OUT2P
Power supply pin for Analog signal
Power supply pin for ch2 PWM signal
Vcc～0V
GNDP2
0V
20,21
OUT2N
Vcc～0V
22,23
OUT1N
Vcc～0V
24
GNDP1
0V
15,16
Please connect the capacitor.
Output pin of ch2 positive PWM
Please connect to Output LPF.
19
－
GND pin for ch2 PWM signal
17,18
20,21
Output pin of ch2 negative PWM
Please connect to Output LPF.
19
Output pin of ch1 negative PWM
Please connect to Output LPF.
GND pin for ch1 PWM signal
Output pin of ch1 posotive PWM
25,26
OUT1P
Vcc～0V
27,28
VCCP1
－
25,26
22,23
Please connect to Output LPF.
Power supply pin for ch1 PWM signal
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27,28
24
Please connect the capacitor.
11/34
2011.06 - Rev.A
Technical Note
BD5451EFV
●Terminal setting
(1) Gain pin function
GAIN
(13pin)
Speaker output gain
L
20dB
H
26dB
(2) RSTX pin, MUTEX pin function
RSTX
(1pin)
MUTEX
(2pin)
L
Normalcy
Error detecting
PWM output
(OUT1P, 1N, 2P, 2N)
ERROR
Output
PWM output
(OUT1P, 1N, 2P, 2N)
ERROR
Output
L or H
HiZ_L
(Reset mode)
H
HiZ_L
(Reset mode)
H
H
L
HiZ_L
(MUTE ON)
H
HiZ_L
(MUTE ON)
L
H
H
Normal operation
(MUTE OFF)
H
HiZ_L
(MUTE ON)
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)
PWM sampling frequency
(fpwm)
Soft-start / Soft-mute time
DC voltage protection in
the speaker detection time
32kHz
256kHz
32msec.
64msec.
44.1kHz
352.8kHz
23msec.
46msec.
48kHz
384kHz
21.5msec.
43msec.
●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 )
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12/34
2011.06 - Rev.A
Technical Note
BD5451EFV
●Format of digital audio input
・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
1/64fs
LRCLK
Lch
Rch
BCLK
SDATA
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
32 clocks
LSB
32 clocks
2
Fig.31 I S Data Format 64fs, 24 bit Data
Lch
LRCLK
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.
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13/34
2011.06 - Rev.A
Technical Note
BD5451EFV
●Audio Interface format and timing
Recommended timing and operating conditions (MCLK, BCLK, LRCLK, SDATA)
1// f MCLK
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
Symbol
Limit
Min.
Max.
8.192
12.288
Unit
1
MCLK frequency
fMCLK
MHz
2
LRCLK frequency
fLRCLK
32
48
kHz
3
BCLK frequency
fBCLK
2.048
3.072
MHz
4
Setup time, LRCLK※1
tSU;LR
20
－
ns
5
Hold time, LRCLK※1
tHD;LR
20
－
ns
6
Setup time, SDATA
tSU;SD
20
－
ns
7
Hold time, SDATA
tHD;SD
20
－
ns
8
Setup time, BCLK※2
tSU;BC
3
－
ns
9
Hold time, BCLK※2
tHD;BC
7
－
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.
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14/34
2011.06 - Rev.A
Technical Note
BD5451EFV
●Power supply start-up sequence
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
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15/34
2011.06 - Rev.A
Technical Note
BD5451EFV
●Power supply shut-down sequence
④Power down VCCA, VCCP1,
VCCP2, simultaneously.
VCCA (14pin)
VCCP1 (15, 16pin)
VCCP2 (27, 28pin)
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
Speaker output
Soft-mute
21.5msec(fs=48kHz)
t
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16/34
2011.06 - Rev.A
Technical Note
BD5451EFV
●About the protection function
PWM
Output
ERROR
Output
Detecting current = 10A (TYP.)
HiZ_Low
(Latch)
L
(Latch)
PWM output Duty=0% or 100%
43msec(fs=48kHz) above fixed
HiZ_Low
(Latch)
L
(Latch)
Chip temperature to be above 150℃ (TYP.)
HiZ_Low
Releasing
Chip temperature to be below 120℃ (TYP.)
condition
Normal
operation
Detecting
condition
HiZ_Low
Protection function
Output short protection
Detecting & Releasing condition
Detecting
condition
DC voltage protection in Detecting
the speaker
condition
High temperature
protection
Detecting
condition
H
Power supply voltage to be below 8V (TYP.)
Under voltage protection
H
Releasing
Power supply voltage to be above 9V (TYP.)
condition
Normal
operation
Detecting
condition
Power supply voltage to be above 21.5V(TYP.)
HiZ_Low
Releasing
Power supply voltage to be below 20.5V(TYP.)
condition
Normal
operation
Over voltage Protection
H
Detecting
condition
Clock stop protection
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.).
Releasing
Normal input to MCLK, BCLK and LRCLK.
condition
*
*
HiZ_Low
H
Normal
operation
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.
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17/34
2011.06 - Rev.A
Technical Note
BD5451EFV
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
Released from latch state .
PWM out ：IC latches with HiZ-Low.
Over current
10A(TYP .)
t
ERROR (10pin )
t
1µsec(TYP.)
MUTEX(2pin)
Latch release
t
10msec(Min.)
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© 2011 ROHM Co., Ltd. All rights reserved.
18/34
2011.06 - Rev.A
Technical Note
BD5451EFV
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.
Release from short to
GND
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)
t
１μsec(TYP.)
MUTEX(2pin)
Latch release
t
１0msec(Min.)
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19/34
2011.06 - Rev.A
Technical Note
BD5451EFV
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.
OUT1P (25, 26pin)
OUT1N (22, 23pin)
OUT2P (17, 18pin)
OUT2N (20, 21pin)
Abnormal state release.
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.)
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© 2011 ROHM Co., Ltd. All rights reserved.
20/34
2011.06 - Rev.A
Technical Note
BD5451EFV
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
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© 2011 ROHM Co., Ltd. All rights reserved.
21/34
2011.06 - Rev.A
Technical Note
BD5451EFV
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
Soft-start
21.5msec(fs=48KHz)
Speaker output
t
ERROR (10pin)
3.3V
t
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© 2011 ROHM Co., Ltd. All rights reserved.
22/34
2011.06 - Rev.A
Technical Note
BD5451EFV
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
Soft-start
21.5msec(fs=48KHz)
Speaker output
t
ERROR (10pin)
3.3V
t
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© 2011 ROHM Co., Ltd. All rights reserved.
23/34
2011.06 - Rev.A
Technical Note
BD5451EFV
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
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24/34
2011.06 - Rev.A
Technical Note
BD5451EFV
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 recover
Clock stop
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
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© 2011 ROHM Co., Ltd. All rights reserved.
25/34
2011.06 - Rev.A
Technical Note
BD5451EFV
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
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© 2011 ROHM Co., Ltd. All rights reserved.
26/34
2011.06 - Rev.A
Technical Note
BD5451EFV
●Application Circuit Example (Stereo BTL Output, RL=8Ω, VCC=10V～16V, Po=～15W)
RSTX
μ-con
1
MUTEX
2
0 SDATA
0 LRCLK
Digital
Audio
Source
0
BCLK
(NOP)
0
MCLK
GNDA
C8
0.1μF
C9
0.1μF
R10
100kΩ
ERROR
27
Driver
FET
1P
4
2
GNDA
8
FILP
9
×8 Over
Sampling
Digital
Filter
11
C12
0.1μF
12
23
21
Gain
Selector
13
14
VCCA
VCCA: 10V～16V
C20
0.1μF
GNDP2
C15
10μF
GNDP2
18
Driver
FET
2P
FILA
L20
10μH
19
Feedback
REG_G
SP 1ch
(8Ω)
20
Feedback
GNDA
C23
0.1μF
L23
10μH
22
Driver
FET
2N
10
GNDP1
GNDP1
GNDP1
PWM
Modulator
REG3
C27
10μF
24
Driver
FET
1N
7
C26
0.1μF
25
Feedback
6
L26
10μH
26
Feedback
IS
I/F
5
VCCP1: 10V～16V
VCCP1
3
C11
0.1μF
C14
10μF
28
Control
I/F
GNDP2
17
C17
0.1μF
SP 2ch
(8Ω)
L17
10μH
16
Output Short Protection
Output DC Voltage Protection
VCCP2
15
Under Voltage Protection
Over Voltage Protection
Clock Stop Protection
High Temperature Protection
VCCP2: 10V～16V
●BOM list (Stereo BTL Output, RL=8Ω, VCC=10V～16V, Po=～15W)
Parts
Parts No.
Value
Company
IC
U1
－
ROHM
Product No.
BD5451EFV
Inductor
L17, L20, L23, L26
10μH
TOKO
B1047DS-100M=3P
Resistor
R10
100kΩ
ROHM
MCR03EZPJ104
C14, C15, C27
10µF
Capacitor
C8, C9, C11, C12
0.1µF
C17, C20, C23, C26
0.1µF
MURATA
Rated
Voltage
Tolerance
Size
－
－
9.7mm×6.4mm
-
(±20%)
7.6mm×7.6mm
1/10W
J(±1%)
1.6mm×0.8mm
GRM31CB11E106KA75L
25V
B(±10%)
3.2mm×1.6mm
GRM188B11A104KA92D
10V
B(±10%)
1.6mm×0.8mm
GRM188B11E104KA01D
25V
B(±10%)
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.
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© 2011 ROHM Co., Ltd. All rights reserved.
27/34
2011.06 - Rev.A
Technical Note
BD5451EFV
●Application Circuit Example (Monaural BTL Output, RL=8Ω, VCC=10V～16V, Po=～15W)
RSTX
μ-con
1
MUTEX
2
0 SDATA
0 LRCLK
Digital
Audio
Source
0
BCLK
(NOP)
0
MCLK
GNDA
C8
0.1μF
C9
0.1μF
R10
100kΩ
ERROR
C11
0.1μF
C12
0.1μF
27
3
4
2
GNDA
8
FILP
9
×8 Over
Sampling
Digital
Filter
23
12
GNDP1
19
Gain
Selector
14
VCCA
VCCA: 10V～16V
GNDP2
18
Driver
FET
2P
FILA
SP 1ch
(8Ω)
20
Feedback
REG_G
C23
0.1μF
21
Feedback
GNDA
11
GNDP1
L23
10μH
22
Driver
FET
2N
10
GNDP1
GNDP1
PWM
Modulator
REG3
C27
10μF
24
Driver
FET
1N
7
C26
0.1μF
25
Feedback
6
L26
10μH
26
Feedback
IS
I/F
5
VCCP1: 10V～16V
VCCP1
Driver
FET
1P
13
C14
10μF
28
Control
I/F
17
16
Output Short Protection
Output DC Voltage Protection
VCCP2
15
Under Voltage Protection
Over Voltage Protection
Clock Stop Protection
High Temperature Protection
●BOM list (Monaural BTL Output, RL=8Ω, VCC=10V～16V, Po=～15W)
Parts
Parts No.
Value
Company
IC
U1
－
ROHM
Product No.
BD5451EFV
Inductor
L23, L26
10μH
TOKO
B1047DS-100M=3P
Resistor
R10
100kΩ
ROHM
MCR03EZPJ104
C14, C27
10µF
Capacitor
C8, C9, C11, C12
0.1µF
C23, C26
0.1µF
MURATA
Rated
Voltage
Tolerance
Size
－
－
9.7mm×6.4mm
-
(±20%)
7.6mm×7.6mm
1/10W
F(±1%)
1.6mm×0.8mm
GRM31CB11E106KA75L
25V
B(±10%)
3.2mm×1.6mm
GRM188B11A104KA92D
10V
B(±10%)
1.6mm×0.8mm
GRM188B11E104KA01D
25V
B(±10%)
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.
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© 2011 ROHM Co., Ltd. All rights reserved.
28/34
2011.06 - Rev.A
Technical Note
BD5451EFV
●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
1
MUTEX
2
0 SDATA
0 LRCLK
Digital
Audio
Source
0
BCLK
(NOP)
0
MCLK
GNDA
C8
0.1μF
C9
0.1μF
R10
100kΩ
ERROR
C11
0.1μF
C12
0.1μF
27
3
4
2
25
Feedback
7
GNDA
8
FILP
9
REG3
×8 Over
Sampling
Digital
Filter
11
12
Gain
Selector
VCCA
L23
GND
L20
C20B
680pF
GNDP2
19
SP 1ch
(8Ω)
10μH
C15
10μF
GNDP2
17
R17
6.8Ω
GNDP2
C17B
680pF
L17
※
10μH
C20
0.1μF
R20
6.8Ω
GNDP2
18
C23
0.1μF
C14B
220μF
20
Driver
FET
2P
FILA
GNDP1
C23B
680pF
VCC: 16V～18V
21
Feedback
REG_G
GNDP1
※
Feedback
GNDA
R23
6.8Ω
GNDP1
22
Driver
FET
2N
10μH
C26
0.1μF
R26
6.8Ω
C27
10μF
23
PWM
Modulator
10
C26B
680pF
24
GNDP1
Driver
FET
1N
6
L26
※
26
Feedback
IS
I/F
5
14
●BOM list
VCCP1
Driver
FET
1P
13
C14
10μF
28
Control
I/F
C17
0.1μF
SP 2ch
(8Ω)
10μH
16
Output Short Protection
Output DC Voltage Protection
VCCP2
15
Under Voltage Protection
Over Voltage Protection
Clock Stop Protection
High Temperature Protection
(Stereo BTL Output, RL=8Ω, VCC=16V～18V, Po=～20W)
Parts
Parts No.
Value
Company
IC
U1
－
ROHM
BD5451EFV
Inductor
L17, L20, L23, L26
10μH
TOKO
B1047DS-100M=3P
R10
100kΩ
ROHM
MCR03EZPJ104
R17, R20, R23, R26
6.8Ω
ROHM
MCR03EZPFL6R80
Resistor
Capacitor
Electrolytic
Capacitor
Product No.
Rated
Voltage
Tolerance
Size
－
－
9.7mm×6.4mm
-
(±20%)
7.6mm×7.6mm
1/10W
J(±5%)
1.6mm×0.8mm
1/10W
F(±1%)
1.6mm×0.8mm
C14, C15, C27
10µF
GRM31CB11E106KA75L
25V
B(±10%)
3.2mm×1.6mm
C8, C9, C11, C12
0.1µF
GRM188B11A104KA92D
10V
B(±10%)
1.6mm×0.8mm
C17, C20, C23, C26
0.1µF
GRM188B11E104KA01D
25V
B(±10%)
1.6mm×0.8mm
C17,B C20B, C23B, C26B
680pF
GRM188B11E681KA01
25V
B(±10%)
1.6mm×0.8mm
C14B
220μF
ECA1EMH221
25V
±20%
φ8mm×11.5mm
MURATA
Panasonic
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.
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© 2011 ROHM Co., Ltd. All rights reserved.
29/34
2011.06 - Rev.A
Technical Note
BD5451EFV
●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
1
MUTEX
2
0 SDATA
0
MCLK
C8
0.1μF
C9
0.1μF
R10
100kΩ
ERROR
C11
0.1μF
C12
0.1μF
2
7
GNDA
8
FILP
9
REG3
×8 Over
Sampling
Digital
Filter
GNDP1
12
L23 10μH
22
VCC: 16V～18V
21
C14B
220μF
GNDP1
GNDP2
18
17
VCCP2
15
Under Voltage Protection
Over Voltage Protection
Clock Stop Protection
High Temperature Protection
VCCA
SP 1ch
(8Ω)
16
Output Short Protection
Output DC Voltage Protection
14
C23
0.1μF
19
Driver
FET
2P
Gain
Selector
GNDP1
C23B
680pF
GND
Feedback
FILA
GNDP1
20
Feedback
REG_G
R23
6.8Ω
GNDP1
※
Driver
FET
2N
GNDA
11
C26
0.1μF
R26
6.8Ω
C27
10μF
23
PWM
Modulator
10
L26 10μH
C26B
680pF
24
Driver
FET
1N
13
●BOM list
25
Feedback
6
C14
10μF
※
26
Feedback
IS
I/F
5
(NOP)
GNDA
27
Driver
FET
1P
4
BCLK
0
VCCP1
3
0 LRCLK
Digital
Audio
Source
28
Control
I/F
(Monaural BTL Output, RL=8Ω, VCC=16V～18V, Po=～20W)
Parts
Parts No.
Value
Company
IC
U1
－
ROHM
Inductor
L23, L26
10μH
TOKO
Resistor
Capacitor
Electrolytic
Capacitor
R10
100kΩ
R23, R26
6.8Ω
C14, C27
10µF
C8, C9, C11, C12
0.1µF
C23, C26
0.1µF
C23B, C26B
680pF
C14B
220μF
ROHM
MURATA
Panasonic
Rated
Voltage
Tolerance
Size
BD5451EFV
－
－
9.7mm×6.4mm
B1047DS-100M=P3
-
(±20%)
7.6mm×7.6mm
Product No.
MCR03EZPJ104
1/10W
J(±5%)
1.6mm×0.8mm
MCR03EZPFL6R80
1/10W
F(±1%)
1.6mm×0.8mm
GRM31CB31E106KA75L
25V
B(±10%)
3.2mm×1.6mm
GRM188B11A104KA92D
10V
B(±10%)
1.6mm×0.8mm
GRM188B11E104KA01D
25V
B(±10%)
1.6mm×0.8mm
GRM188B11E681KA01
25V
B(±10%)
1.6mm×0.8mm
ECA1EMH221
25V
±20%
φ8mm×11.5mm
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.
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© 2011 ROHM Co., Ltd. All rights reserved.
30/34
2011.06 - Rev.A
Technical Note
BD5451EFV
●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.
L
25,26
or
17,18
C
C
22,23
or
20,21
RL
L
Following presents output LC filter constants with typical load impedances.
RL
L
C
4Ω
10µH
0.47µF
6Ω
10µH
0.15µF
8Ω
10µH
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.
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31/34
2011.06 - Rev.A
Technical Note
BD5451EFV
●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.
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.
12)
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)
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© 2011 ROHM Co., Ltd. All rights reserved.
32/34
2011.06 - Rev.A
Technical Note
BD5451EFV
●Package outline (HTSSOP-B28)
BD5451EFV
Lot No.
(UNIT: mm)
PKG: HTSSOP-B28
Drawing No: EX199-5002-1
●Allowable Power Dissipation
6
HTSSOP-B28 Package
PCB② 4.7W
Power dissipation :Pd (W)
5
4
PCB① 3.3W
3
2
1
0
0
10
20
30
40
50
60
70
80
90
100 110 120 130 140 150
Ambient 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
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© 2011 ROHM Co., Ltd. All rights reserved.
33/34
2011.06 - Rev.A
Technical Note
BD5451EFV
●Ordering part number
B
D
5
Part No.
4
5
1
E
Part No.
F
V
Package
EFV: HTSSOP-B28
-
E
2
Packaging and forming specification
E2: Embossed tape and reel
HTSSOP-B28
<Tape and Reel information>
9.7±0.1
(MAX 10.05 include BURR)
(5.5)
1
Tape
Embossed carrier tape (with dry pack)
Quantity
2500pcs
Direction
of feed
E2
The direction is the 1pin of product is at the upper left when you hold
( reel on the left hand and you pull out the tape on the right hand
)
14
+0.05
0.17 -0.03
1PIN MARK
1.0MAX
0.625
1.0±0.2
(2.9)
0.5±0.15
15
4.4±0.1
6.4±0.2
28
+6°
4° −4°
0.08±0.05
0.85±0.05
S
0.08 S
0.65
+0.05
0.24 -0.04
0.08
1pin
M
Reel
(Unit : mm)
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© 2011 ROHM Co., Ltd. All rights reserved.
34/34
Direction of feed
∗ Order quantity needs to be multiple of the minimum quantity.
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/
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© 2011 ROHM Co., Ltd. All rights reserved.
R1120A