ROHM BD5446EFV

Middle Power Class-D Speaker Amplifiers
Class-D Speaker Amplifier
for Digital Input
BD5446EFV
No.10075EBT14
●Description
BD5446EFV is a Class D Speaker Amplifier designed for Flat-panel TVs in particular for space-saving and low-power
consumption, delivers an output power of 20W+20W. This IC employs state-of-the-art Bipolar, CMOS, and DMOS (BCD)
process technology that eliminates turn-on resistance in the output power stage and internal loss due to line resistances up
to an ultimate level. With this technology, the IC can achieve high efficiency of 87% (10W+10W output with 8Ω load). In
addition, the IC is packaged in a compact reverse heat radiation type power package to achieve low power consumption
and low heat generation and eliminates necessity of external heat-sink up to a total output power of 40W. This product
satisfies both needs for drastic downsizing, low-profile structures and many function, high quality playback of sound system.
●Features
1) BD5446EFV has two system of digital audio interface.
2
(I S/LJ format, SDATA: 16 / 20 / 24bit, LRCLK: 32kHz / 44.1kHz / 48kHz, BCLK: 64fs (fixed), SYS_CLK: 256fs (fixed))
2) Within the wide range of the power supply voltage, it is possible to operate in a single power supply. (10~26V)
3) It contributes to miniaturizing, making to the thin type, and the power saving of the system by high efficiency and low heat.
4) S/N of the system can be optimized by adjusting the gain setting among 8 steps. (20~34dB / 2dB step)
5) It has the output power limitation function that can be adjusted to an arbitrary output power.
6) The decrease in sound quality because of the change of the power supply voltage is prevented with the feedback
circuitry of the output. In addition, a low noise and low distortion are achieved.
7) It provides with the best stereo DAC output for the headphone usage. As a result, the output of the selection of the
digital input in two systems is possible.
8) Eliminates pop noise generated when the power supply goes on/off, or when the power supply is suddenly shut off.
High quality muting performance is realized by using the soft-muting technology.
9) BD5446EFV is a highly reliable design to which it has various protection functions.
(High temperature protection, Under voltage protection, Output short protection, Output DC voltage protection and
Clock stop protection)
●Applications
Flat Panel TVs (LCD, Plasma), Home Audio, Desktop PC, Amusement equipments, Electronic Music equipments, etc.,
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© 2010 ROHM Co., Ltd. All rights reserved.
1/30
2010.05 - Rev.B
Technical Note
BD5446EFV
●Absolute maximum ratings (Ta=25℃)
Parameter
Symbol
Supply voltage
Power dissipation
Input voltage
VCC
Pd
VIN
Ratings
Unit
Conditions
30
V
Pin 25, 28, 29, 53, 54
2.0
W
*3
4.5
W
*4
6.2
W
*5
-0.3 ~ 4.5
V
Pin 7 ~ 18, 21
*1
Pin24
*1
Open-drain terminal voltage
VERR
-0.3 ~ 30
V
Operating temperature range
Topr
-25 ~ +85
℃
Storage temperature range
Tstg
-55 ~ +150
℃
Maximum junction temperature
Tjmax
+150
℃
*1 *2
*1 The voltage that can be applied reference to GND (Pin 6, 36, 37, 45, 46).
*2 Do not, however exceed Pd and Tjmax=150℃.
*3 70mm×70mm×1.6mm, FR4, 1-layer glass epoxy board (Copper on bottom layer 0%)
Derating in done at 16mW/℃ for operating above Ta＝25℃.
*4 70mm×70mm×1.6mm, FR4, 2-layer glass epoxy board (Copper on bottom layer 100%)
Derating in done at 36mW/℃ for operating above Ta＝25℃. There are thermal via on the board.
*5 70mm×70mm×1.6mm, FR4, 4-layer glass epoxy board (Copper on bottom layer 100%)
Derating in done at 49.6mW/℃ for operating above Ta＝25℃. There are thermal via on the board.
●Operating conditions (Ta=25℃)
Parameter
Symbol
Ratings
Unit
VCC
10 ~ 26
V
Pin 25, 28, 29, 53, 54
Minimum load impedance
(Speaker Output)
RL_SP
5.4
Ω
*6
Minimum load impedance
(DAC Output)
RL_DA
20
kΩ
Pin 22, 23
Supply voltage
Conditions
*1 *2
*6 Do not, however exceed Pd.
* No radiation-proof design.
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© 2010 ROHM Co., Ltd. All rights reserved.
2/30
2010.05 - Rev.B
Technical Note
BD5446EFV
●Electrical characteristics
(Unless otherwise specified Ta=25℃,Vcc=13V,f=1kHz,RL_SP=8Ω,RL_DA=20kΩ,RESETX=3.3V,MUTEX=3.3V,PDX=3.3V,
Gain=20dB,fs=48kHz)
Limits
Item
Symbol
Unit
Conditions
Min
Typ
Max
Total circuit
Circuit current
Pin 25, 28, 29, 53, 54
No load
Pin 25, 28, 29, 53, 54,No load
RESETX=0V,MUTEX=0V,PDX=0V
ICC1
-
45
90
mA
ICC2
-
1.5
3
mA
VERR
-
-
0.8
V
Pin 24,IO=0.5mA
Regulator output voltage 1
VREG_G
5.0
5.5
6.0
V
Pin 1, 27
Regulator output voltage 2
VREG_3
3.0
3.3
3.6
V
Pin 5
High level input voltage
VIH
2.5
-
3.3
V
Pin 7 ~ 18, 21
Low level input voltage
VIL
0
-
0.8
V
Pin 7 ~ 18, 21
IIH
33
66
132
µA
Pin 7 ~ 18, 21,VIN = 3.3V
PO1
-
10
-
W
PO2
-
20
-
W
THDSP
-
0.07
-
%
PO=1W, BW=20~20kHz
*7
CTSP
65
80
-
dB
PO=1W, BW=IHF-A
*7
VNO_SP
-
140
280
µVrms -∞dBFS, BW=IHF-A
*7
VNOR_SP
-
5
10
µVrms MUTEX=0V,-∞dBFS, BW=IHF-A
*7
fPWM1
-
512
-
KHz
fs=32kHz
*7
fPWM2
-
705.6
-
KHz
fs=44.1kHz
*7
fPWM3
-
768
-
KHz
fs=48kHz
*7
VOMAX
0.85
1.0
-
Vrms
0dBFS,THD+n=1%
CB
-1
0
1
dB
0dBFS
THDDA
-
0.05
0.5
%
-20dBFS,BW=20~20kHz
CTDA
65
80
-
dB
0dBFS,BW=IHF-A
Output noise voltage
VNO_DA
-
10
20
µVrms -∞dBFS, BW=IHF-A
Residual noise voltage
VNOR_DA
-
3
10
µVrms
Circuit current
(Power down mode)
Open-drain terminal
Low level voltage
Input current
(Input pull-down terminal)
Speaker Output
Maximum momentary
output power 1
Maximum momentary
output power 2
Total harmonic distortion
Crosstalk
Output noise voltage
(Sampling mode)
Residual noise voltage
(Mute mode)
PWM sampling frequency
THD+n=10%
GAIN=26dB
VCC=18V, THD+n=10%
GAIN =26dB
*7
*7
DAC Output
Maximum output voltage
Channel Balance
Total harmonic distortion
Crosstalk
MUTEX=0V,PDX=0V,
-∞dBFS, BW=IHF-A
*7 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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© 2010 ROHM Co., Ltd. All rights reserved.
3/30
2010.05 - Rev.B
Technical Note
BD5446EFV
●Electrical characteristic curves(VCC=13V,Ta=25℃,RL_SP=8Ω,RL_DA=20kΩ,Gain=20dB,fin=1kHz,fs=48kHz)
Measured by ROHM designed 4 layer board.
80
Sampling
60
50
Mute
40
30
20
10
0
3
THD=10%
THD=1%
0
Fig.1
VOLTAGE GAIN(dB)
EFFICIENCY(%)
80
70
60
50
40
30
20
10
0
8
10
30
28
26
24
22
20
18
16
14
12
10
20 25
30
Without signal
BW=20～20KHz
-20
-40
-60
-80
-100
-140
100
1k
10k
100k
10
100
1k
10k
FREQUENCY(Hz)
FREQUENCY(Hz)
Fig.4
Fig.5
Fig.6
Efficiency - Output power
Voltage gain - Frequency
100
THD+N(%)
6KHz
1KHz
0.1
0.001 0.01
0.1
1
1
0.1
100Hz
0.01
CROSSTALK(dB)
10
10
0.01
100
10
100
1k
10k
100k
FREQUENCY(Hz)
OUTPUT POWER(W)
100k
FFT of Output noise voltage
Po=1W
BW=20～20KHz
BW=20～20KHz
1
40
-120
10
10
35
0
12
100
THD+N(%)
15
Fig.3
Po=1W
L=22µH
C=0.47µF
Cg=0.068µF
OUTPUT PO WER(W/ch)
CROSSTALK(dB)
10
Current consumption
- Output power
Output power
- Power supply voltage
100
90
6
5
TOTAL OUTPUT POWER(W)
Fig.2
Current consumption
- Power supply voltage
4
0
VCC(V)
VCC(V)
2
VCC=18V
1
8 10 12 14 16 18 20 22 24 26 28
8 10 12 14 16 18 20 22 24 26 28
0
VCC=13V
2
NOISE FFT(dBV)
ICC(mA)
70
44
40
36
32
28
24
20
16
12
8
4
0
ICC(A)
OUTPUT POWER(W/ch)
100
90
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
BW=20～20KHz
0.001
0.01
0.1
1
10
OUTPUT POWER(W)
Fig.7
Fig.8
Fig.9
THD+N - Output power
THD+N - Frequency
Crosstalk - Output power
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
fin=300Hz
Po=3.3W
Po=1W
BW=20～20KHz
Speaker output
5V/div
5V/div
MUTEX
2V/div
10ms/div
10
100
1k
fin=300Hz
Po=3.3W
Speaker output
10k
MUTEX
2V/div
10ms/div
100k
FREQUENCY(Hz)
Fig.10
Crosstalk –Frequency
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© 2010 ROHM Co., Ltd. All rights reserved.
Fig.11
Wave form when
Releasing Soft-mute
4/30
Fig.12
Wave form when
Activating Soft-mute
2010.05 - Rev.B
Technical Note
BD5446EFV
●Electrical characteristic curves(VCC=18V,Ta=25℃,RL_SP=8Ω,RL_DA=20kΩ,Gain=20dB,fin=1kHz,fs=48kHz)
Measured by ROHM designed 4layer board.
100
70
60
50
40
30
20
10
36
34
Po=1W
L=22µH
C=0.47µF
Cg=0.068µF
32
30
28
26
5
10
15
20
-80
-100
-140
10
100
OUTPUT POWER(W /ch)
1k
10k
10
100k
100
1k
10k
100k
FREQUENCY(Hz)
FREQUENCY(Hz)
Fig.13
Fig.14
Fig.15
Efficiency – Output power
Voltage gain - Frequency
FFT of output noise voltage
100
100
Po=1W
BW=20～20KHz
BW=20～20KHz
1
6KHz
1KHz
0.1
CROSSTALK(dB)
10
THD+N(%)
10
THD+N(%)
-60
20
0
1
0.1
100Hz
0.01
0.01
0.001 0.01
0.1
1
10
100
OUTPUT POWER(W)
0
-10
-20
-30
-40
-50
-60
-70
-80
10
100
1k
10k
100k
FREQUENCY(Hz)
Fig.16
THD+N - Output power
CROSSTALK(dB)
-40
-120
24
22
0
Without signal
BW=20～20KHz
-20
NOISE FFT(dBV)
VOLTAGE GAIN(dB)
80
EFFICIENCY(%)
0
40
38
90
Fig.17
THD+N - Frequency
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
BW=20～20KHz
0.001 0.01
0.1
1
10
100
OUTPUT POWER(W)
Fig.18
Crosstalk - Output power
Po=1W
BW=20～20KHz
-90
-100
10
100
1k
10k
100k
FREQUENCY(Hz)
Fig.19
Crosstalk - Frequency
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© 2010 ROHM Co., Ltd. All rights reserved.
5/30
2010.05 - Rev.B
Technical Note
BD5446EFV
●Pin configuration and Block diagram
VCCP1
1
REG_G1
54
2
FILP
53
3
Power
Limiter
NC 52
4
FILA
51
5
REG_3
50
REG_G1
GNDA
6
49
Driver
1P
7
NC 48
NC 47
8
9
I2S/LJ
Interface
46
Driver
1N
10
45
GNDP1
11
44
12
43
Control
Interface
13
14
15
REG_G1
I2S/LJ
Selector
42
×8 Over
Sampling
Digital
Filter
PWM
Modulator
NC
40
REG_G2
39
16
17
Gain
Selector
38
Driver
2N
18
19
37
GNDP2
TEST
36
NC 35
20
21
41
DAC
Selector
Driver
2P
NC 34
22
33
DAC
REG_G2
23
32
24
31
25
26
VCCA
NC
27
High Temperature Protection
Under Voltage Protection
Clock Stop Protection
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29
Output Short Protection
Output DC Voltage Protection
VCCP2
REG_G2
© 2010 ROHM Co., Ltd. All rights reserved.
NC 30
6/30
28
2010.05 - Rev.B
Technical Note
BD5446EFV
●Pin function explanation (Provided pin voltages are typ. Values)
No.
Pin name
Pin voltage
Pin explanation
Internal equivalence circuit
53,54
28,29
1
27
REG_G1
REG_G2
5.5V
Internal power supply pin for ch1 Gate driver
Internal power supply pin for ch2 Gate driver
1
27
Please connect the capacitor.
550K
45,46
36,37
25
Bias pin for PWM signal
2
FILP
1.75V~2.55V
2
Please connect the capacitor.
6
25
3
PLMT
0V
Power limiter setting terminal
3
400K
6
27
4
50K
Bias pin for Analog signal
FILA
4
2.5V
Please connect the capacitor.
50K
6
25
Internal power supply pin for Digital circuit
5
REG3
3.3V
5
Please connect the capacitor.
500K
6
6
GNDA
0V
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© 2010 ROHM Co., Ltd. All rights reserved.
GND pin for Analog signal
7/30
－
2010.05 - Rev.B
Technical Note
BD5446EFV
No.
Pin name
7
8
9
10
11
SYS_CLK
BCLK
LRCLK
SDATA1
SDATA2
Pin voltage
Pin explanation
Internal equivalence circuit
5
0V
Digital audio signal input pin
7,8,9
10,11
50K
6
12
RESETX
13
MUTEX
Reset pin for Digital circuit
H: Reset OFF
L: Reset ON
0V
Power down control pin
H: Power down OFF
L: Power down ON
PDX
14
Speaker output mute control pin
H: Mute OFF
L: Mute ON
5
12,13,14
50K
6
5
Digital audio signal data format setting terminal
15
IIS_LJ
0V
H: Left Justified format
2
L: I S format
15
50K
6
5
16
17
18
GAIN1
GAIN2
GAIN3
Gain setting terminal
0V
Gain=20dB~34dB, 2dB step
16,17,18
50K
6
5
19
20
TEST1
TEST2
Test pin
0V
19,20
Please connect to GND.
50K
6
5
DAC output selection terminal
21
SEL_DAC
0V
H: SDATA2 is output from the DAC
L: SDATA1 is output from the DAC
21
50K
6
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© 2010 ROHM Co., Ltd. All rights reserved.
8/30
2010.05 - Rev.B
Technical Note
BD5446EFV
No.
Pin name
Pin voltage
Pin explanation
Internal equivalence circuit
25
OUT_DAC2
OUT_DAC1
2.5V
22,23
Please connect it with the latter part circuit
through the capacitor.
50K
22
23
ch2 DAC output pin
ch1 DAC output pin
6
25
Error flag pin
500
24
ERROR
3.3V
Please connect pull-up resistor.
H: While Normal
L: While Error
24
6
25
VCCA
VCC
26,30
34,35
41,47
48,52
N.C.
－
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© 2010 ROHM Co., Ltd. All rights reserved.
Power supply pin for Analog signal
－
Non connection pin
－
9/30
2010.05 - Rev.B
Technical Note
BD5446EFV
No.
Pin name
Pin voltage
28,29
VCCP2
Vcc
31,32
OUT2P
Vcc~0V
Pin explanation
Internal equivalence circuit
Power supply pin for ch2 PWM signal
28,29
33
BSP2P
－
36,37
GNDP2
0V
38,39
OUT2N
Vcc~0V
Output pin of ch2 positive PWM
Please connect to Output LPF.
Boot-strap pin of ch2 positive
Please connect the capacitor.
GND pin for ch2 PWM signal
Output pin of ch2 negative PWM
Please connect to Output LPF.
40
BSP2N
－
Boot-strap pin of ch2 negative
Please connect the capacitor.
42
BSP1N
－
Boot-strap pin of ch1 negative
Please connect the capacitor.
43,44
OUT1N
Vcc~0V
45,46
GNDP1
0V
GND pin for ch1 PWM signal
Boot-strap pin of ch1 positive
Please connect the capacitor.
49
BSP1P
－
50,51
OUT1P
Vcc~0V
53,54
VCCP1
Output pin of ch1 negative PWM
Please connect to Output LPF.
－
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© 2010 ROHM Co., Ltd. All rights reserved.
Output pin of ch1 positive PWM
Please connect to Output LPF.
33
40
31,32
38,39
36,37
53,54
42
49
43,44
50,51
45,46
Power supply pin for ch1 PWM signal
10/30
2010.05 - Rev.B
Technical Note
BD5446EFV
●GAIN1 pin, GAIN2 pin, GAIN3 pin function
GAIN3
(18pin)
GAIN2
(17pin)
GAIN1
(16pin)
Speaker output gain
L
L
L
20dB
L
L
H
22dB
L
H
L
24dB
L
H
H
26dB
H
L
L
28dB
H
L
H
30dB
H
H
L
32dB
H
H
H
34dB
●SEL_DAC pin function
SEL_DAC
(21pin)
OUT_DAC1 (23pin)
OUT_DAC2 (24pin)
L
The Lch signal of SDATA1 is output
The Rch signal of SDATA1 is output
H
The Lch signal of SDATA2 is output
The Rch signal of SDATA2 is output
●RESETX pin function
RESETX
(10pin)
State of Digital block
L
Reset ON
H
Reset OFF
●RESETX pin
RESETX
(12pin)
State of Digital block
L
Reset ON
H
Reset OFF
●PDX pin,MUTEX pin function
PDX
(12pin)
MUTEX
(11pin)
Power Down
DAC output
(24,25pin)
L
L or H
ON
HiZ_Low
H
L
H
H
OFF
Normal operation
PWM output
(33,34,38,39,43,44,48pin)
HiZ_Low
Normal operation
●IIS_LJ pin function
IIS_LJ
(15pin)
Digital data format
L
I2S
H
Left Justified
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© 2010 ROHM Co., Ltd. All rights reserved.
11/30
2010.05 - Rev.B
Technical Note
BD5446EFV
●Input digital audio signal sampling frequency (fs) explanation
PWM sampling frequency, Soft-start, Soft-mute time, and the detection time of the DC voltage protection in the speaker
depends on sampling frequency (fs) of the digital audio input.
Sampling frequency of the
digital audio input
(fs)
32kHz
PWM sampling frequency
(fpwm)
Soft-start / Soft-mute time
DC voltage protection in
the speaker detection time
512kHz
64msec.
64msec.
44.1kHz
705.6kHz
46msec.
46msec.
48kHz
768kHz
43msec.
43msec.
●For voltage gain (Gain setting)
BD5446EFV 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 = Full scale input, Gain setting = 20dB, Load resistance
2
RL_SP = 8Ω will give speaker output (BTL output) amplitude as Vo=10Vrms. (Output power Po = Vo /RL_SP = 12.5W )
●Speaker output and DAC output
Digital audio input signal SDATA1 will be output to the speaker. (SDATA2 will not be output to the speaker. DAC output can
be selected either from digital audio input signal SDATA1 or SDATA2.)
●Format of digital audio input
・SYS_CLK: It is System Clock input signal.
It will input LRCLK, BCLK, SDATA1 (SDATA2) 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).
・SDATA1 & SDATA2: 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.
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© 2010 ROHM Co., Ltd. All rights reserved.
12/30
2010.05 - Rev.B
Technical Note
BD5446EFV
●I2S data format
1/64fs
LRCLK
Lch
Rch
BCLK
SDATA1
MSB
(SDATA2)
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
32 clocks
1
LSB
32 clocks
Fig.20
I2S Data Format 64fs, 24 bit Data
Lch
LRCLK
7 6 5 4 3 2
Rch
BCLK
SDATA1
MSB
18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
MSB
LSB
18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
LSB
(SDATA2)
Fig.21
I2S Data Format 64fs, 20 bit Data
Lch
LRCLK
Rch
BCLK
SDATA1
MSB
(SDATA2)
14 13 12 11 10 9 8 7 6 5 4 3 2 1
MSB
LSB
Fig.22
14 13 12 11 10 9 8 7 6 5 4 3 2 1
LSB
2
I S 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.
●Left-justified format
1/64fs
LRCLK
Lch
Rch
BCLK
SDATA1
(SDATA2)
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
32 clocks
7 6 5 4 3 2 1
32 clocks
Fig.23
Left-Justified Data Format 64fs, 24 bit Data
Lch
LRCLK
LSB
Rch
BCLK
SDATA1
MSB
18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
MSB
LSB
18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
LSB
(SDATA2)
Fig.24
Left-Justified Data Format 64fs, 20 bit Data
Lch
LRCLK
Rch
BCLK
SDATA1
(SDATA2)
MSB
14 13 12 11 10 9 8 7 6 5 4 3 2 1
MSB
LSB
Fig.25
14 13 12 11 10 9 8 7 6 5 4 3 2 1
LSB
Left-Justified Data Format 64fs, 16 bit Data
The High section of LRCLK becomes Lch, the Low section of LRCLK becomes Rch.
After changing LRCLK, first bit becomes MSB.
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© 2010 ROHM Co., Ltd. All rights reserved.
13/30
2010.05 - Rev.B
Technical Note
BD5446EFV
●Power supply start-up sequence
VCCA (25pin)
VCCP1 (53, 54pin)
VCCP2 (28, 29pin)
①Power up VCCA, VCCP1, VCCP2 simultaneously.
t
REG_3 (5pin)
REG_G1 (1pin)
REG_G2 (27pin)
REG_G1, REG_G2
REG_3
t
RESETX (12pin)
②Set RESETX to High after power up.
t
SYS_CLK (7pin)
BCLK (8pin)
LRCLK (9pin)
SDATA1 (10pin)
SDATA2 (11pin)
③Degital audio data communication.
t
PDX (14pin)
④Set PDX to High.
t
OUT_DAC1 (23pin)
OUT_DAC2 (22pin)
t
MUTEX (13pin)
⑤Set MUTEX to High.
t
Soft-start
43msec(fs=48kHz)
Speaker output
t
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© 2010 ROHM Co., Ltd. All rights reserved.
14/30
2010.05 - Rev.B
Technical Note
BD5446EFV
●Power supply shut-down sequence
VCCA (25pin)
VCCP1 (53, 54pin)
VCCP2 (28, 29pin)
⑤Power down VCCA, VCCP1, VCCP2, simultaneously.
t
REG_3 (5pin)
REG_G1 (1pin)
REG_G2 (27pin)
REG_G1, REG_G2
REG_3
t
RESETX (12pin)
④Set RESETX to Low
t
SYS_CLK (7pin)
BCLK
(8pin)
LRCLK (9pin)
SDATA1 (10pin)
SDATA2 (11pin)
③Stop digital audio date signal.
t
PDX (14pin)
②Set PDX to Low.
t
OUT_DAC1 (23pin)
OUT_DAC2 (22pin)
t
MUTEX (13pin)
①Set MUTEX to Low.
t
Soft-mute
43msec(fs=48kHz)
t
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© 2010 ROHM Co., Ltd. All rights reserved.
15/30
2010.05 - Rev.B
Technical Note
BD5446EFV
●About the protection function
Protection function
Detecting & Releasing condition
Output short
protection
Detecting
condition
Detecting current = 10A (TYP.)
DC voltage protection
in the speaker
Detecting
condition
PWM output Duty=0% or 100%
43msec(fs=48kHz) above fixed
Detecting
condition
Chip temperature to be above 150℃ (TYP.)
High temperature
protection
Under voltage
protection
Clock stop protection
Releasing
condition
Chip temperature to be below 120℃ (TYP.)
Detecting
condition
Power supply voltage to be below 8V (TYP.)
DAC
Output
Normal
operation
Normal
operation
Normal
operation
PWM
Output
ERROR
Output
HiZ_Low
(Latch)
L
(Latch)
HiZ_Low
(Latch)
L
(Latch)
HiZ_Low
Normal
operation
H
HiZ_Low
Releasing
condition
Normal
operation
Power supply voltage to be above 9V (TYP.)
Detecting
condition
No change to SYS_CLK more than 1usec (TYP.)
Irregular
output
HiZ_Low
Releasing
condition
Normal input to SYS_CLK
Normal
operation
Normal
operation
H
H
* 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 the MUTEX pin is made Low once, the MUTEX pin is returned to High again.
②Turning on the power supply again.
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© 2010 ROHM Co., Ltd. All rights reserved.
16/30
2010.05 - Rev.B
Technical Note
BD5446EFV
1) High temperature protection
This IC has the high temperature protection circuit that prevents thermal reckless driving under an abnormal state for the
temperature of the chip to exceed Tjmax=150℃.
Detecting condition - It will detect when MUTE pin is set High and the temperature of the chip becomes 150℃(TYP.) or
more. The speaker output is muted through a soft-mute when detected.
Releasing condition - It will release when MUTE 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 (50, 51pin)
OUT1N (43, 44pin)
OUT2P (31, 32pin)
OUT2N (38, 39pin)
HiZ-Low
t
Speaker output
Soft-mute
43msec(fs=48KHz)
Soft-start
43msec(fs=48KHz)
t
ERROR (24pin)
3.3V
t
OUT_DAC1 (23pin)
OUT_DAC2 (22pin)
t
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© 2010 ROHM Co., Ltd. All rights reserved.
17/30
2010.05 - Rev.B
Technical Note
BD5446EFV
2) Under voltage protection
This IC has the under voltage protection circuit that make speaker output mute once detecting extreme drop of the power
supply voltage.
Detecting condition – It will detect when MUTE pin is set High and the power supply voltage becomes lower than 8V.
The speaker output is muted through a soft-mute when detected.
Releasing condition – It will release when MUTE pin is set High and the power supply voltage becomes more than 9V.
The speaker output is outputted through a soft-start when released.
VCCA (25pin)
VCCP1 (53, 54pin)
VCCP2 (28, 29pin)
9V
8V
t
OUT1P (50, 51pin)
OUT1N (43, 44pin)
OUT2P (31, 32pin)
OUT2N (38, 39pin)
HiZ-Low
t
Speaker output
Soft-mute
43msec(fs=48kHz)
Soft-start
43msec(fs=48kHz)
t
ERROR (24pin)
3.3V
t
OUT_DAC1 (23pin)
OUT_DAC2 (22pin)
t
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© 2010 ROHM Co., Ltd. All rights reserved.
18/30
2010.05 - Rev.B
Technical Note
BD5446EFV
3) Clock stop protection
This IC has the clock stop protection circuit that make the speaker output mute when the SYS_CLK signal of the digital
audio input stops.
Detecting condition - It will detect when MUTE pin is set High and the SYS_CLK signal stops for about 1usec or more.
The speaker output is muted through a soft-mute when detected.
Releasing condition - It will release when MUTE pin is set High and the SYS_CLK signal returns to the normal clock
operation. The speaker output is outputted through a soft-start when released.
Clock stop
Clock recover
SYS_CLK (7pin)
t
Protection start with
about 1μsec clock stop.
OUT1P (50, 51pin)
OUT1N (43, 44pin)
OUT2P (31, 32pin)
OUT2N (38, 39pin)
HiZ-Low
t
Soft-start
43msec(fs=48kHz)
Speaker output
t
ERROR (24pin)
3.3V
t
OUT_DAC1 (23pin)
OUT_DAC2 (22pin)
Unstable
t
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© 2010 ROHM Co., Ltd. All rights reserved.
19/30
2010.05 - Rev.B
Technical Note
BD5446EFV
4)Output short protection(Short to the power supply)
This IC has the PWM output short protection circuit that stops the PWM output when the PWM output is short-circuited to
the power supply due to abnormality.
Detecting condition - It will detect when MUTE pin is set High and the current that flows in the PWM output pin
becomes 10A(TYP.) or more. The PWM output instantaneously enters the state of HiZ-Low if
detected, and IC does the latch.
Releasing method - ①After the MUTEX pin is set Low once, the MUTEX pin is set High again.
②Turning on the power supply again.
Short to VCC
Release from short to VCC
OUT1P (50, 51pin)
OUT1N (43, 44pin)
OUT2P (31, 32pin)
OUT2N (38, 39pin)
t
PWM out ：　IC latches with HiZ-Low.
Released from latch state.
Over current
10A(TYP.)
t
ERROR (24pin)
t
１μsec(TYP.)
MUTEX（13pin）
Latch release
t
5) 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 MUTE 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 the MUTEX pin is set Low once, the MUTEX pin is set High again.
②Turning on the power supply again.
Short to GND
Release from short to
GND
OUT1P (50, 51pin)
OUT1N (43, 44pin)
OUT2P (31, 32pin)
OUT2N (38, 39pin)
t
PWM out ：　IC latches with HiZ-Low.
Released from latch state.
Over current
10A(TYP.)
t
ERROR (24pin)
t
１μsec(TYP.)
MUTEX(13pin)
Latch release
t
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© 2010 ROHM Co., Ltd. All rights reserved.
20/30
2010.05 - Rev.B
Technical Note
BD5446EFV
6) DC voltage protection in the speaker
When the DC voltage in the speaker is impressed due to abnormality, this IC has the protection circuit where the speaker
is defended from destruction.
Detecting condition - It will detect when MUTE pin is set High or Low and PWM output Duty=0% or 100% ,
43msec(fs=48kHz) or above. Once detected, The PWM output instantaneously enters the state
of HiZ-Low, and IC does the latch.
Releasing method – ①After the MUTEX pin is set Low once, the MUTEX pin is set High again.
②Turning on the power supply again
Abnormal state release.
PWM out locked duty=100% abnormal state.
OUT1P (50, 51pin)
OUT1N (43, 44pin)
OUT2P (31, 32pin)
OUT2N (38, 39pin)
t
PWM output ：　IC latche with HiZ-Low.
Latch release state.
Speaker output
t
Soft-start
Protection start surge current
into speaker output for 43msec
(fs=48kHz) and over.
43msec(fs=48kHz)
ERROR (24pin)
t
MUTEX(13pin)
Latch release
t
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© 2010 ROHM Co., Ltd. All rights reserved.
21/30
2010.05 - Rev.B
Technical Note
BD5446EFV
●Output power limiter function
This IC is provided with an output power limiter function to protect speakers from destruction by an excessive output.
Limiter values are freely specified by changing external resistors R1/R2 as shown in Fig-26. Fig-27 shows a speaker output
waveform that is generated with use of the output limiter function. Because the waveform is soft-clipped, unusual noises on
audible signals are significantly reduced under operation of limiter.
Use resistors with a high degree of accuracy for R1 and R2 (±1% or higher accuracy is recommended). The capacitor C is
for the noise removal of output power limitation terminal (3pin). Provide grounding with a 1µF capacitor. Specify a resistor of
10kΩ or higher resistor R1 and R2. If the output power limiter function is not used, R1, R2 and C is unnecessary. However,
connect 3pin with GNDA.
Power
Limiter
REG_3
3
R1
R2
Speaker
output
5
C
1μF
5pin
3.3V
Soft Clip
1μF
Fig-27
GNDA
Fig-26
10
OUTPUT POWER(W/ch) .
9
8
7
6
5
4
3
VCC=13V, RL=8Ω, f=1kHz
Gain=20dB, 5pin=3.3V
2
1
0
1
1.2
1.4
1.6
1.8
2
3pin terminal voltage [V]
Fig.28
Output power
– 3pin terminal voltage
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© 2010 ROHM Co., Ltd. All rights reserved.
22/30
2010.05 - Rev.B
Technical Note
BD5446EFV
●Application Circuit Example(RL_SP=8Ω)
C1
3.3μF
GNDP1
VCCP1
1
(
(
)
)
C4
( )
C2
1μF
1μF
C5
VCCP1
REG_G1
2
FILP
53
3
Power
Limiter
NC 52
4
FILA
51
5
REG_3
50
1μF
REG_G1
GNDA
Driver
1P
NC 48
SDATA1
9
I2S/LJ
Driver
1N
15
GNDP1
Control
Interface
I2S/LJ
Selector
×8 Over
Sampling
Digital
Filter
PWM
Modulator
40
OUT_DAC2
(Rch)
OUT_DAC1
(Lch)
ERROR
VCCA
1μFC23
100kΩ
Gain
Selector
GNDP2
Driver
2N
GNDP2
REG_G2
23
32
24
31
VCCA
NC
27
High Temperature Protection
Under Voltage Protection
Clock Stop Protection
C28
220μF
C28D
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© 2010 ROHM Co., Ltd. All rights reserved.
0.33μF
C31C
R31B GNDP2
5.6Ω
C31B
470pF
8Ω
Rch
(SDATA1)
C31A
0.068μF
1μF
C31
22μH
L31
NC 30
29
Output Short Protection
Output DC Voltage Protection
VCCP2
REG_G2
C38A
5.6Ω
R38B
33
DAC
26
3.3μF
C27
36
NC 34
22
10μF C25D
GNDP2
Driver
2P
0.068μF
470pF
C38B
1μF
DAC
Selector
GNDA
GNDA
37
NC 35
25
L38
22μH
38
3.3V
R24
C25
0.1μF
1μF
C38
39
20
21
22μH
L43
REG_G2
TEST
1μF
C22
0.068μF
NC 41
19
VSS
Lch
(SDATA1)
42
18
VSS
8Ω
C42
1μF
REG_G1
16
17
R43B GNDP1
5.6Ω
C43B
470pF
C43A
43
14
3.3V
0.33μF
C43C
44
13
PDX
C50A
C53D
5.6Ω
220μF R50B
45
12
MUTEＸ
C53
1μF
GNDP1
11
RESETＸ
0.068μF
470pF
C50B
46
Interface
10
SDATA2
C49
1μF
NC 47
8
LRCLK (fs=32kHz～48kHz)
L50
22μH
49
7
BCLK (64fs)
μ-con
GNDA
6
SYS_CLK (256fs)
Digital Audio
Source
54
28
VCCP2
23/30
2010.05 - Rev.B
Technical Note
BD5446EFV
●BOM list(RL_SP=8Ω)
Parts
Parts No.
Value
Company
Product No.
Rated
Voltage
Tolerance
Size
IC
U1
－
ROHM
BD5446EFV
－
－
18.5mm×9.5mm
TOKO
1168ER-0001
-
(±20%)
10.3mm×7.6mm
SAGAMI
DBE7210H-220M
-
(±20%)
10.5mm×6.4mm
ROHM
MCR18PZHZFL5R60
1/4W
F(±1%)
3.2mm×1.6mm
Inductor
Resistor
Capacitor
Electrolytic
Capacitor
L31, L38, L43, L50
22μH
R31B, R38B
R43B, R50B
5.6Ω
C31, C38, C42, C49
1μF
GRM185B31C105KE43
16V
B(±10%）
1.6mm×0.8mm
C25, C28, C53
0.1μF
GRM188B31H104KA92
50V
B(±10%）
1.6mm×0.8mm
C31A, C38A
C43A, C50A
0.068μF
GRM21BB11H683KA01
50V
B(±10%）
2.0mm×1.25mm
C31C, C43C
0.33μF
GRM219B31H334KA87
50V
B(±10%）
2.0mm×1.25mm
C1, C27
3.3μF
GRM188B31A335KE15
10V
B(±10%）
1.6mm×0.8mm
C2, C4, C5
C22, C23
1μF
GRM185B30J105KE25
6.3V
B(±10%）
1.6mm×0.8mm
C31B, C38B
C43B, C50B
470pF
GRM188B11H471KA
50V
B(±10%）
2.0mm×1.2mm
C28D, C53D
220μF
ECA1VMH221
35V
±20%
φ8mm×11.5mm
EEUFC1H100L
50V
±20%
φ5mm×11mm
MURATA
Panasonic
C25D
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© 2010 ROHM Co., Ltd. All rights reserved.
10μF
24/30
2010.05 - Rev.B
Technical Note
BD5446EFV
●Application Circuit Example(RL_SP=6Ω)
C1
3.3μF
GNDP1
VCCP1
(
(
)
)
C4
( )
C2
1μF
1μF
C5
VCCP1
1
REG_G1
2
FILP
53
3
Power
Limiter
NC 52
4
FILA
51
5
REG_3
50
1μF
REG_G1
GNDA
Driver
1P
NC 48
SDATA1
9
I2S/LJ
RESETＸ
MUTEＸ
Driver
1N
43
I2S/LJ
Selector
×8 Over
Sampling
Digital
Filter
40
OUT_DAC2
(Rch)
OUT_DAC1
(Lch)
ERROR
VCCA
1μFC23
100kΩ
Gain
Selector
GNDP2
Driver
2N
GNDP2
NC 34
REG_G2
23
32
24
31
VCCA
NC
27
High Temperature Protection
Under Voltage Protection
Clock Stop Protection
C28
220μF
C28D
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© 2010 ROHM Co., Ltd. All rights reserved.
0.47μF
C31C
R31B GNDP2
5.6Ω
C31B
470pF
6Ω
Rch
(SDATA1)
C31A
0.1μF
1μF
C31
15μH
L31
NC 30
29
Output Short Protection
Output DC Voltage Protection
VCCP2
REG_G2
0.1μF C38A
470pF
C38B
5.6Ω
R38B
33
DAC
26
3.3μF
C27
Driver
2P
22
10μF C25D
GNDP2
36
1μF
DAC
Selector
GNDA
GNDA
37
NC 35
25
L38
15μH
38
3.3V
R24
C25
0.1μF
1μF
C38
39
20
21
15μH
L43
REG_G2
TEST
1μF
C22
0.1μF
NC 41
19
VSS
Lch
(SDATA1)
42
PWM
Modulator
18
VSS
6Ω
C42
1μF
REG_G1
Control
Interface
16
17
0.47μF
C43C
R43B GNDP1
5.6Ω
C43B
470pF
C43A
GNDP1
12
15
C53D
5.6Ω
220μF R50B
45
44
14
3.3V
C53
1μF
GNDP1
11
13
PDX
0.1μF C50A
470pF
C50B
46
Interface
10
SDATA2
C49
1μF
NC 47
8
LRCLK (fs=32kHz～48kHz)
L50
15μH
49
7
BCLK (64fs)
μ-con
GNDA
6
SYS_CLK (256fs)
Digital Audio
Source
54
28
VCCP2
25/30
2010.05 - Rev.B
Technical Note
BD5446EFV
●BOM list(RL_SP=6Ω)
Parts
Parts No.
Value
Company
Product No.
Rated
Voltage
Tolerance
Size
IC
U1
－
ROHM
BD5446EFV
－
－
18.5mm×9.5mm
Inductor
L31, L38, L43, L50
15μH
SAGAMI
DBE7210H-150M
－
(±20%)
10.5mm×6.4mm
Resistor
R31B, R38B
R43B, R50B
5.6Ω
ROHM
MCR18PZHZFL5R60
1/4W
F(±1%)
3.2mm×1.6mm
C31, C38, C42, C49
1µF
GRM185B31C105KE43
16V
B(±10%）
1.6mm×0.8mm
C25, C28, C53, C31A,
C38A, C43A, C48A
0.1μF
GRM188B31H104KA92
50V
B(±10%）
1.6mm×0.8mm
C31C, C43C
0.47μF
GRM21BB31H474KA87
50V
B(±10%）
2.0mm×1.2mm
Capacitor
Electrolytic
Capacitor
MURATA
C1, C27
3.3μF
GRM188B31A335KE15
10V
B(±10%）
1.6mm×0.8mm
C2, C4, C5
C22, C23
1μF
GRM185B30J105KE25
6.3V
B(±10%）
1.6mm×0.8mm
C31B, C38B
C43B, C50B
470pF
GRM188B11H471KA
50V
B(±10%）
2.0mm×1.2mm
C28D, C53D
220μF
ECA1VMH221
35V
±20%
φ8mm×11.5mm
EEUFC1H100L
50V
±20%
φ5mm×11mm
Panasonic
C25D
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© 2010 ROHM Co., Ltd. All rights reserved.
10μF
26/30
2010.05 - Rev.B
Technical Note
BD5446EFV
●Output LC Filter Circuit
An output filter is required to eliminate radio-frequency components exceeding the audio-frequency region supplied to a
load (speaker). Because this IC uses sampling clock frequencies from 200kHz to 400kHz in the output PWM signals, the
high-frequency components must be appropriately removed.
This section takes an example of an LC type LPF shown in Fig.29, 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.
Filter constants depend on load impedances. The following are formulas to calculate values of L, C, and Cg when Q=0.707
is specified.
48, 49
or
38, 39
L ＝
L
Cg
C
45, 46
or
33, 34
L
RL
2
1
C ＝
RL
H
4π f C
F
2 π f C RL
Cg
Cg ＝ 0 .2 C
2
F
Fig. 29
RL : Load impedance (Ω)
fC : LPF cut off frequency (Hz)
Following presents output LC filter constants with typical load impedances.
RL
L
6Ω
22µH
8Ω
33µH
16Ω
68µH
fC = 30kHz
C
fC = 40kHz
C
Cg
RL
L
Cg
0.68µF
0.15µF
6Ω
15µH
0.47µF
0.1µF
0.47µF
0.1µF
8Ω
22µH
0.33µF
0.068µF
0.22µF
0.047µF
16Ω
47µH
0.15µF
0.033µF
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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27/30
2010.05 - Rev.B
Technical Note
BD5446EFV
●Notes for use
1 ) Absolute maximum ratings
Use of the IC in excess of absolute maximum ratings such as the applied voltage or operating temperature range may
result in IC damage. Assumptions should not be made regarding the state of the IC (short mode or open mode) when
such damage is suffered. A physical safety measure such as a fuse should be implemented when use of the IC in a
special mode where the absolute maximum ratings may be exceeded is anticipated.
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 6, 36, 37, 45, 46).
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 25, 28, 29, 53, 54)
In case power supply is started up, RESETX(Pin 12), MUTEX(Pin 13) and PDX (Pin 14) 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 24)
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 ) N.C. terminal(Pin 26, 30, 34, 35, 41, 47, 48, 52)
N.C. terminal (Non Connection Pin) does not connect to the inside circuit. Therefore, possible to use open.
12 ) TEST terminal(Pin 19, 20)
TEST terminal connects with ground to prevent the malfunction by external noise.
13 ) 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.
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28/30
2010.05 - Rev.B
Technical Note
BD5446EFV
●Allowable Power Dissipation
7
PCB③ 6.2W
Power Dissipation Pd （W)
6
5
PCB② 4.5W
4
3
PCB① 2.0W
2
1
0
0
10
20
30
40
50
60
70
80
90 100 110 120 130 140 150
Ambient Temperature:Ta( ℃)
Measuring instrument : TH-156(Shibukawa Kuwano Electrical Instruments Co., Ltd.)
Measuring conditions : Installation on ROHM’s board
Board size : 70mm×70mm×1.6mm(with thermal via on board)
Material : FR4
・The board on exposed heat sink on the back of package are connected by soldering.
PCB① : 1-layer board(back copper foil size: 0mm×0mm), θja＝62.5℃/W
PCB② : 2-layer board(back copper foil size: 70mm×70mm),θja＝27.8℃/W
PCB③ : 4-layer board(back copper foil size: 70mm×70mm),θja＝20.2℃/W
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29/30
2010.05 - Rev.B
Technical Note
BD5446EFV
●Ordering part number
B
D
5
Part No.
4
4
6
Part No.
E
F
V
-
Package
EFV : HTSSOP-B54
E
2
Packaging and forming specification
E2: Embossed tape and reel
HTSSOP-B54
<Tape and Reel information>
18.5±0.1
(MAX 18.85 include BURR)
+6°
4° −4°
(6.0)
1PIN MARK
1.0±0.2
0.5±0.15
(5.0)
1
Embossed carrier tape (with dry pack)
Quantity
1500pcs
28
7.5±0.1
9.5±0.2
54
Tape
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
)
27
+0.05
0.17 -0.03
0.8
0.08±0.05
1.0MAX
0.85±0.05
S
0.08 S
0.65
+0.05
0.22 -0.04
0.08
1pin
M
Reel
(Unit : mm)
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30/30
Direction of feed
∗ Order quantity needs to be multiple of the minimum quantity.
2010.05 - Rev.B
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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R1010A