ROHM BD5444EFV-E2

Middle Power Class-D Speaker Amplifiers
Analog Input /
Single End Output
Class-D Speaker Amplifier
No.10075EBT16
BD5445EFV
●Overview
BD5445EFV is a Analog input type Class D Speaker Amplifier designed for Flat-panel TVs in particular for space-saving
and low-power consumption, delivers an output power of 17W+17W. 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 91% (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 34W. This
product satisfies both needs for drastic downsizing, low-profile structures and powerful, high-quality playback of sound
system.
●Features
1) 17W stereo single-ended outputs
34W mono bridge-tied-load output
2) Wide supply voltage (From 10V to 27V)
3) Four selectable gain (14, 20, 26, 32dB)
4) Master / Slave function
5) Soft-start and Soft-mute
6) Low noise, Low distortion
7) Various protection functions
(High temperature, Output short, Under voltage)
8) Small power package (HTSSOP-B28)
●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.
1/31
2010.05 - Rev.B
Technical Note
BD5445EFV
●Absolute maximum ratings (Ta=25℃)
Item
Supply voltage
Power dissipation
Input voltage for signal
Input voltage for control
Input voltage for clock
Operating temperature range
Storage temperature range
Maximum junction temperature
Symbol
Vcc
Pd
VIN
VCONT
VOSC
Topr
Tstg
Tjmax
Limit
30
1.45
3.30
4.70
-0.3 ～ 5.3
-0.3 ～ Vcc + 0.3
-0.3 ～ 5.3
-25 ～ +85
-55 ～ +150
+150
Unit
V
W
W
W
V
V
V
℃
℃
℃
Conditions
Pin 1, 15, 16, 27, 28
Pin 4, 5
Pin 2, 3, 10, 11, 13
Pin 12
※1 ※2
※3
※4
※5
※1
※1
※1
※1 The voltage that can be applied, based on Gnd(Pin6, 20, 21, 22, 23)
※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 11.6mW/℃ 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 26.4mW/℃ 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 37.6mW/℃ for operating above Ta＝25℃. There are thermal via on the board.
●Operating conditions (Ta＝25℃)
Item
Supply voltage
Minimum load impedance
※6
※
Symbol
Vcc
RL
Limit
10 ～ 27
3.6
Unit
V
Ω
Conditions
Pin 1, 15, 16, 27, 28
※1 ※2
※6
Do not, however exceed Pd.
No radiation-proof design
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© 2010 ROHM Co., Ltd. All rights reserved.
2/31
2010.05 - Rev.B
Technical Note
BD5445EFV
●Electrical characteristics （ Unless otherwise specified Ta=25℃, Vcc=24V, f=1kHz, RL=8Ω, Po=1W, Gain=20dB,
PDX=24V, MUTEX=24V, MS=0V, Single-ended outputs）
Limit
Item
Symbol
Unit
Conditions
Min
Typ
Max
Whole circuit
Pin 1, 15, 16, 27, 28
Circuit current 1
ICC1
25
50
mA
No load, No signal
Pin 1, 15, 16, 27, 28
Circuit current 2
ICC2
2
4
mA
PDX=0V,MUTEX=0V, No load, No
(Power down mode)
signal
Control circuit
Pin 2, 3, 10, 11, 13
High level input voltage for control
VIH
2.5
24
V
Low level input voltage for control
VIL
0
-
0.8
V
High level input voltage for clock
VIHC
2.5
-
5
V
Low level input voltage for clock
VILC
0
-
0.8
V
PO1
PO2
GV0
GV1
GV2
GV3
12
18
24
30
10
17
14
20
26
32
16
22
28
34
THD
-
0.05
-
%
CT
60
75
-
dB
Pin 2, 3, 10, 11, 13
Pin 12
Pin 12
Audio circuit
Momentary maximum output power
Voltage gain
Total harmonic distortion
Crosstalk
W
dB
Output noise voltage
VNO
-
80
160
μVrms
Residual noise voltage
(Power down mode)
VNOR
-
1
10
μVrms
Mute attenuation
※7
※7
※7
※7
※7
※7
※7
Rg=0Ω, BW=IHF-A
※7
Rg=0Ω, BW=IHF-A
※7
PDX=0V, MUTEX=0V
Rg=0Ω, BW=IHF-A
※7
GVM
80
94
-
dB
Power supply rejection ratio
PSRR
-
60
-
dB
Internal oscillation frequency
FOSC
480
600
720
kHz
External clock frequency
RL=8Ω, THD+n=10%
RL=4Ω, THD+n=10%
Gain1=0V, Gain0=0V
Gain1=0V, Gain0=24V
Gain1=24V, Gain0=0V
Gain1=24V, Gain0=24V
BW=20～20kHz
FEXT
480
-
720
kHz
MUTEX=0V, BW= IHF-A
※7
Vripple=1Vrms, BW= IHF-A
Rg=0Ω, fripple=100Hz
Pin 12, MS=0V
※7
※7
Pin 12, MS=24V
※7
※7 These items show the typical performance of device and depend on board layout, parts, 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.
3/31
2010.05 - Rev.B
Technical Note
BD5445EFV
●Typical Characteristics Data (SE×2ch）Measured on ROHM’s evaluation board.
3
40
RL=8Ω
No　Signal
PDX=MUTEX=L
2.5
30
2
25
Icc (mA)
Icc (mA)
RL=8Ω
No　Signal
PDX=MUTEX=H
35
1.5
20
15
1
10
0.5
5
0
0
8
10
12
14
16
18
20
22
24
26
28
30
8
10
12
14
Vcc (V)
20
22
24
26
28
30
Fig. 2 Power supply voltage－Current consumption
100
100
Vcc=24V
RL=8Ω
BW=20～20kHz
10
THD+N(%)
THD+N(%)
18
Vcc (V)
Fig. 1 Power supply voltage－Current consumption
10
16
1
6kHz
0.1
1
0.1
1kHz
100Hz
0.01
0.01
0.001
0.01
0.1
1
10
100
10
100
Fig.3 Output power－THD+N
Fig.4
10000
100000
Frequency－THD+N
0
0
Vcc=24V
RL=8Ω
fin=1kHz
BW=20～20kHz
-10
-20
Vcc=24V
RL=8Ω
Po=1W
BW=20～20kHz
-10
-20
-30
CROSSTALK(dB)
-30
CROSSTALK(dB)
1000
FREQUENCY(Hz)
OUTPUT POWER(W)
-40
-50
-60
-40
-50
-60
-70
-70
-80
-80
-90
-90
-100
0.001
-100
0.01
0.1
1
10
100
10
OUTPUT POWER(W)
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1000
10000
100000
FREQUENCY(Hz)
Fig.5 Output power－Crosstalk
© 2010 ROHM Co., Ltd. All rights reserved.
100
Fig.6 Frequency－Crosstalk
4/31
2010.05 - Rev.B
Technical Note
BD5445EFV
●Typical Characteristics Data (SE×2ch）Measured on ROHM’s evaluation board.
40
0
35
Gain=38dB
-20
Vcc=24V
RL=8Ω
No Signal
BW=20～20kHz
Gain=32dB
-40
25
Gain=26dB
20
NOISE FFT(dBV)
VOLTAGE GAIN(dB)
30
Gain=20dB
15
10
Vcc=24V
RL=8Ω
Po=1W
L=47uH
C=0.39uF
5
0
-5
-60
-80
-100
-120
-10
-140
10
100
1000
10000
100000
10
100
FREQUENCY(Hz)
Fig.7 Frequency－Voltage gain
Vcc=24V
Gain=20dB
FILP=22uF
1000
10000
100000
FREQUENCY(Hz)
Fig.8 FFT of Output Noise Voltage
Vcc=24V
Gain=20dB
FILP=22uF
Speaker
Output
10V/div.
10V/div.
Speaker
Output
FILP
FILP
2V/div.
2V/div.
PDX
10V/div.
Fig.9
10V/div.
50ms/div.
Waveform when releasing Power-down
Vcc=24V
Po=1W
fin=200Hz
Fig.10
PDX
50ms/div.
Waveform when activating Power-down
Speaker
Output
Speaker
Output
Vcc=24V
Po=1W
fin=200Hz
2V/div.
2V/div.
MUTEX
10V/div.
10V/div.
10ms/div.
Fig.11 Waveform when releasing Soft-mute
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© 2010 ROHM Co., Ltd. All rights reserved.
Fig.12
5/31
10ms/div.
MUTEX
Waveform when activating Soft-mute
2010.05 - Rev.B
Technical Note
BD5445EFV
●Typical Characteristics Data (SE×2ch）Measured on ROHM’s evaluation board.
26
100
RL=8Ω
fin=1kHz
90
80
20
18
70
16
14
12
10
EFFICIENCY(%)
Output Power (W/ch)
24
22
THD+n=10%
8
6
60
50
40
30
Vcc=24V
RL=8Ω
fin=1kHz
20
THD+n=1%
4
2
10
0
0
8
10
12
14
16
18
20
22
24
26
28
30
0
2
4
6
VCC(V)
Fig.13 Power supply voltage－Output power (RL=8Ω)
26
1.6
24
22
1.2
Output Power (W/ch)
Consumption Current (A)
1.4
1
0.8
0.6
Vcc=24V
RL=8Ω
fin=1kHz
0.2
12
14
16
18
20
RL=6Ω
fin=1kHz
20
18
16
14
12
10
THD+n=10%
8
6
THD+n=1%
4
2
0
0
0
5
10
15
20
25
30
35
40
8
10
12
14
16
TOTAL OUTPUT POWER(W)
18
20
22
24
26
28
30
VCC(V)
Fig.15 Total output power－Current consumption (RL=8Ω)
Fig.16 Power supply voltage－Output power (RL=6Ω)
100
2
90
1.8
80
1.6
70
1.4
60
1.2
ICC(A)
EFFICIENCY(%)
10
Fig.14 Output power－Efficiency (RL=8Ω)
1.8
0.4
8
OUTPUT POWER(W/ch)
50
40
1
0.8
30
0.6
Vcc=24V
RL=6Ω
fin=1kHz
20
10
Vcc=24V
RL=6Ω
fin=1kHz
0.4
0.2
0
0
0
2
4
6
8
10
12
14
16
18
20
0
OUTPUT POWER(W/ch)
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10
15
20
25
30
35
40
TOTAL OUTPUT POWER(W)
Fig.17 Output power－Efficiency (RL=6Ω)
© 2010 ROHM Co., Ltd. All rights reserved.
5
Fig.18 Total output power－Current consumption (RL=6Ω)
6/31
2010.05 - Rev.B
Technical Note
BD5445EFV
●Typical Characteristic Data (SE×2ch）Measured on ROHM’s evaluation board.
Dotted lines of the graphs indicate continuous output power by installing additional heat sinks.
100
26
24
90
RL=4Ω
fin=1kHz
22
80
70
18
16
EFFICIENCY(%)
Output Power (W/ch)
20
14
THD+n=10%
12
10
8
50
40
30
THD+n=1%
6
60
Vcc=24V
RL=4Ω
fin=1kHz
20
4
10
2
0
0
8
10
12
14
16
18
20
22
24
26
28
30
0
Vcc (V)
Fig.19
5
10
15
20
OUTPUT POWER(W/ch)
Power supply voltage－Output power (RL=4Ω)
Fig.20 Output power－Efficiency (RL=4Ω)
2
1.8
1.6
1.4
ICC(A)
1.2
1
0.8
0.6
Vcc=24V
RL=4Ω
fin=1kHz
0.4
0.2
0
0
5
10
15
20
25
30
35
40
TOTAL OUTPUT POWER(W)
Fig.21 Total output power－Current consumption (RL=4Ω)
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© 2010 ROHM Co., Ltd. All rights reserved.
7/31
2010.05 - Rev.B
Technical Note
BD5445EFV
●Typical Characteristic Data (SE×2ch）Measured on ROHM’s evaluation board.
Dotted lines of the graphs indicate continuous output power by installing additional heat sinks.
100
100
Vcc=24V
RL=8Ω
BW=20～20kHz
10
THD+N(%)
THD+N(%)
10
Vcc=24V
RL=8Ω
Po=1W
BW=20～20kHz
6kHz
1
1
1kHz
0.1
0.1
100Hz
0.01
0.001
0.01
0.01
0.1
1
10
100
10
100
1000
OUTPUT POWER(W)
Fig.22 Output power－THD+n
0
35
Gain=38dB
30
-20
Vcc=24V
RL=8Ω
No Signal
BW=20～20kHz
Gain=32dB
-40
25
Gain=26dB
20
NOISE FFT(dBV)
VOLTAGE GAIN(dB)
100000
Fig.23 Frequency－THD+n
40
Gain=20dB
15
10
Vcc=24V
RL=8Ω
Po=1W
L=47uH
C=0.39uF
5
0
-5
-60
-80
-100
-120
-10
-140
10
100
1000
10000
100000
10
100
1000
FREQUENCY(Hz)
10000
100000
FREQUENCY(Hz)
Fig.24 Frequency－Voltage gain
Fig.25
50
100
45
90
40
80
35
70
EFFICIENCY(%)
Ouput Power (W)
10000
FREQUENCY(Hz)
30
25
20
FFT of Output Noise Voltage
60
50
40
15
30
10
20
5
10
Vcc=24V
RL=8Ω
fin=1kHz
0
0
8
10
12
14
16
18
20
22
24
26
28
0
30
Fig.26 Power supply voltage－Output power (RL=8Ω)
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© 2010 ROHM Co., Ltd. All rights reserved.
5
10
15
20
25
30
35
40
OUTPUT POWER(W/ch)
Vcc (V)
Fig.27 Output power－Efficiency (RL=8Ω)
8/31
2010.05 - Rev.B
Technical Note
BD5445EFV
●Typical Characteristics Data (BTL) Measured on ROHM’s evaluation board.
2
1.8
1.6
1.4
ICC(A)
1.2
1
0.8
0.6
Vcc=24V
RL=8Ω
fin=1kHz
0.4
0.2
0
0
5
10
15
20
25
30
35
40
TOTAL OUTPUT POWER(W)
Fig.28 Total output power－Current consumption (RL=8Ω)
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© 2010 ROHM Co., Ltd. All rights reserved.
9/31
2010.05 - Rev.B
Technical Note
BD5445EFV
●Pin configuration and Block diagram
1
2
3
4
5
VCCP1
VCCA
28
27
Gain
Control
PWM
Modulator
26
Driver
1
25
4step
Gain
Amp.
REG_G
24
6
GNDA
23
7
FILA
22
8
FILP
21
9
10
11
12
13
14
20
Power down
Control
Mute
Control
19
REG_G
PWM
Modulator
18
Driver
2
17
Oscillator
Control
REG_G
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© 2010 ROHM Co., Ltd. All rights reserved.
16
High Temperature Protection
Output Short Protection
Under Voltage Protection
10/31
VCCP2
15
2010.05 - Rev.B
Technical Note
BD5445EFV
●Pin function explanation (Provided pin voltages are typ. values)
Pin
Pin name
Pin voltage
Pin explanation
No.
1
VCCA
Vcc
Power supply pin for Analog signal
2
3
GAIN0
GAIN1
－
4
5
IN1
IN2
2.5V
Internal equivalence circuit
Gain control pin
ch1 Analog signal input pin
ch2 Analog signal input pin
1
16K～40K
Input audio signal via a capacitor.
4/5
6
6
GNDA
0V
Gnd pin for Analog signal
7
FILA
2.5V
Bias pin for Analog signal
40K～64K
Please connect the capacitor.
8
FILP
2～4V
Bias pin for PWM signal
1
Please connect the capacitor.
8
6
9
ROSC
2.5V
Internal PWM sampling clock frequency
setting pin
Please connect the resister setting Master
mode.
Please connect the capacitor setting Slave
mode.
10
PDX
－
Power down control pin
H: Power down OFF
L: Power down ON
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© 2010 ROHM Co., Ltd. All rights reserved.
11/31
2010.05 - Rev.B
Technical Note
BD5445EFV
Pin
No.
11
Pin name
Pin voltage
MUTEX
－
Pin explanation
Internal equivalence circuit
Speaker output mute control pin
H: Mute OFF
L: Mute ON
12
OSC
－
PWM sampling clock input and output pin
When using 2 or more ICs, connect to these
pins.
13
MS
－
Master mode and Slave mode control pin
H: Slave mode
L: Master mode
14
REG_G
5.5V
Internal power supply pin for Gate driver
Please connect the capacitor.
15
16
17
18
VCCP2
Vcc
OUT2
0V～Vcc
Power supply pin for ch2 PWM signal
Output pin of ch2 PWM
Please connect to Output LPF.
19
BSP2
5V
Boot-strap pin of ch2
Please connect the capacitor.
20
21
GNDP2
0V
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© 2010 ROHM Co., Ltd. All rights reserved.
Gnd pin for ch2 PWM signal
12/31
2010.05 - Rev.B
Technical Note
BD5445EFV
Pin
No.
22
23
24
25
26
Pin name
Pin voltage
GNDP1
0V
Gnd pin for ch1 PWM signal
BSP1
5V
Boot-strap pin of ch1
OUT1
0V～Vcc
Pin explanation
Internal equivalence circuit
Please connect the capacitor.
Output pin of ch1 PWM
Please connect to Output LPF.
27
28
VCCP1
Vcc
Power supply pin for ch1 PWM signal
●Audio input circuit (pin4 and pin5)
Connect the audio input pin with a prior-stage circuit via coupling capacitors C4 and C5. Because C4, C5 and input
impedance R4, R5 of the IC circuit compose the primary HPF, the values determine an input low-band cutoff frequency. Input
cutoff frequencies are calculated by the following formulas:
1
[Hz ]
fC =
2πR4 • C4
1
[Hz ]
fC =
2πR5 • C5
An excessively high capacitance of an input coupling capacitor results in a longer period required for stabilizing a power input
pin voltage after turning on the power supply. Note that placing the MUTEX pin (pin11) at "L" level (mute turned off) for
avoidance of Pop-noise before stabilizing an input pin. R4 and R5 are changed by Gain setting.
GAIN1
(3pin)
L
GAIN0
(2pin)
L
R4,R5 input
impedance(TYP.)
40kΩ
Amplifier Gain (SE)
Amplifier Gain (BTL)
14dB
20dB
L
H
40kΩ
20dB
26dB
H
L
26.7kΩ
26dB
32dB
H
H
16kΩ
32dB
38dB
R4
C4
4
Prior-stage
circuit
R5
C5
5
Fig. 29 Coupling capacitors of audio input pins
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© 2010 ROHM Co., Ltd. All rights reserved.
13/31
2010.05 - Rev.B
Technical Note
BD5445EFV
●Output LC Filter Circuit (Pins 17, 18, 25, and 26)
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 between 480kHz and 720kHz in the output PWM signals, the high-frequency
components must be appropriately removed.
This section takes an example of an LC type LPF, in which coil Lfil and capacitor Cfil compose a differential filter with an
attenuation property of -12dB/oct. A large part of switching currents flow to capacitor Cfil, and only a small part of the currents
flow to speaker RL. The following is a table for output LC filter constants.
Speaker
SE output
BTL output
RL
Lfil[μH]
Cfil1[μF]
Cfil2[μF]
4Ω
22
0.68
―
6Ω
33
0.47
―
8Ω
47
0.39
―
4Ω
15
0.22
1
6Ω
22
0.15
0.68
8Ω
33
0.1
0.47
In SE(single end) applications, the dc blocking capacitor (Cse) and speaker impedance compose the primary HPF. The cutoff
frequency is determined by
1
[Hz ]
fC =
2πCSE • RL
The following table is Cse setting at cutoff frequency 20Hz, 40Hz, and 60Hz.
RL
CSE[μF]
4Ω
fc=60Hz
680
fc=40Hz
1000
fc=20Hz
2200
6Ω
470
680
1500
8Ω
330
470
1000
Fig.30 SE filter configuration
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© 2010 ROHM Co., Ltd. All rights reserved.
Fig.31 BTL filter configuration
14/31
2010.05 - Rev.B
Technical Note
BD5445EFV
●Control pins function
①GAIN0, GAIN1 function
GAIN1
(Pin 3)
GAIN0
(Pin 2)
Amplifier Gain (SE)
Amplifier Gain (BTL)
L
L
14dB
20dB
L
H
20dB
26dB
H
H
L
H
26dB
32dB
32dB
38dB
Speaker output
Power down
②MUTEX, PDX function
MUTEX
(Pin 11)
L
PDX
(Pin 10)
L
HiZ_Low
ON
L
H
Mute
OFF
H
H
Normal operation
H
L
③MS function
MS
(13pin)
L
H
OFF
Forbidden
Mode
Master mode
Slave mode
※Please connect ROSC terminal (pin 9) to 22kohm resister for setting master mode.
※Please connect to the following filter, and input clock (duty = 50%) to OSC terminal (pin 12) for setting slave mode.
PWM Sampling frequency is sited from input clock. If input clock have noise (ex.Jitter), noise appear to Speaker output.
Fig.32 ROSC terminal filter circuit for setting slave mode.
※ High level input voltage (Max.voltage) of tease control pin is equal to Vcc voltage. But absolute max.voltage of
In0(pin4),ROSC(pin9),OSC(pin12) and REG_G(pin14) is 5.3V. Tease pins may break, when short next pins. If these pins
short to Vcc, connecting through 10kΩ resister prevent IC from destruction.
Vcc
10kΩ
BD5445EFV
pin2
pin3
pin10
pin11
pin13
Fig.33
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© 2010 ROHM Co., Ltd. All rights reserved.
15/31
2010.05 - Rev.B
Technical Note
BD5445EFV
●Power supply start-up sequence
VCCA(1pin)
VCCP1(27,28pin)
VCCP2(15,16pin)
t
PDX(10pin)
①PDX set high after power supply voltage
is stabilized sufficiency.
t
MUTEX(11pin)
②MUTEX set high after speaker output dc voltage is stabilized sufficiency.
t
FILP(8pin)
t
OUT1(25,26pin)
OUT2(17,18pin)
t
Speaker output
t
800msec(typ.)
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
Sotf-start
55msec(typ.)
16/31
2010.05 - Rev.B
Technical Note
BD5445EFV
●Power supply shut-down sequence
Power supply shut down, after PDX (Pin 10) change H→L. The IC has possibly to sound POP noise, if PDX (Pim10) keep
H. Speaker’s coupling capacitor (Fig30:Cse) don’t discharge at this time. Pop-noise may sound when power supply start up
at the next time.
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© 2010 ROHM Co., Ltd. All rights reserved.
17/31
2010.05 - Rev.B
Technical Note
BD5445EFV
●Power supply start-up and shut-down sequence for single control
Short between PDX(Pin 10) and MUTEX(Pin 11), enable to control these pins at one time.
PDX (Pin 10) and MUTEX (Pin 11) set low at one time, while this IC is on normal mode, the IC don't operate soft-mute. If low
frequency and high level signal input this time, the IC has possibility to sound POP-Noise. To avoid this POP-Noise configure
the following circuit, because PDX (Pin10) enables to change low after MUTEX (Pin11) have changed. This sequence make
less POP-Noise because the IC can operate soft-mute.
MUTEX
PD/MUTE Control
110KΩ
11
90KΩ
τH=R10×C10
PDX
R10
110KΩ
10
τL=(R10+200KΩ)×C10
90KΩ
C10
Control configuration for soft-mute operation by single control
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© 2010 ROHM Co., Ltd. All rights reserved.
18/31
2010.05 - Rev.B
Technical Note
BD5445EFV
●About the protection function
Protection
function
Output short
protection
High
temperature
protection
Under voltage
protection
Detecting & Releasing condition
Detecting
condition
PWM
Output
Detecting current = 10A (TYP.)
HiZ_Low
Release from Vcc or Gnd short
Normal
operation
Chip temperature to be above 150℃ (TYP.)
HiZ_Low
Chip temperature to be below 125℃ (TYP.)
Normal
operation
Detecting
condition
Power supply voltage to be below 8V (TYP.)
HiZ_Low
Releasing
condition
Power supply voltage to be above 9V (TYP.)
Normal
operation
Releasing
condition
Detecting
condition
Releasing
condition
※ All protection functions are restored automatically when the fault is removed.
1）Output short protection（Short to the power supply）
This IC has the 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 PDX 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 – This IC detect releasing from Vcc short every 220msec(TYP.). Normal operation is restored when
releasing from Vcc short.
Vcc short
Release from Vcc short
OUT1(Pin 25,26)
OUT2(Pin 17,18)
t
Current
10A(TYP.)
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© 2010 ROHM Co., Ltd. All rights reserved.
Speaker output
: Vcc short
19/31
Speaker output
: Hiz-Low release
from Vcc short
Speaker output
: Normal operation
IC restores automatically
release from Vcc short
2010.05 - Rev.B
Technical Note
BD5445EFV
2）Output short protection（Short to Gnd）
This IC has the 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 PDX 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 – This IC detect releasing from Gnd short every 220msec(TYP.). Normal operation is restored when
releasing from Gnd short.
(※)Remark of output short protection
Circuit current changes suddenly, when IC detects output short protection. At this time IC may break, because supply
voltage rise up by back electromotive force. Decoupling capacitors (VCCPI and VCCP2) should be placed as close to the
IC as possible. (recommend 4.7μF or more.)
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© 2010 ROHM Co., Ltd. All rights reserved.
20/31
2010.05 - Rev.B
Technical Note
BD5445EFV
3）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 PDX 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 PDX 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.
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© 2010 ROHM Co., Ltd. All rights reserved.
21/31
2010.05 - Rev.B
Technical Note
BD5445EFV
4）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 PDX pin is set High and the power supply voltage becomes lower than 8V.
The speaker output is muted when detected.
Releasing condition – It will release when PDX 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 (1pin)
VCCP1 (27,28pin)
VCCP2 (15,16pin)
9V
8V
t
OUT1 (25, 26pin)
OUT2 (17, 18pin)
Out put : HiZ-Low
t
Soft-start
55msec(typ.)
Speaker
output
t
800msec(typ.)
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© 2010 ROHM Co., Ltd. All rights reserved.
22/31
2010.05 - Rev.B
Technical Note
BD5445EFV
●Application Circuit Example ( single-ended output ×2 )
+
+
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© 2010 ROHM Co., Ltd. All rights reserved.
23/31
2010.05 - Rev.B
Technical Note
BD5445EFV
●BOM List ( single-ended output ×2 )
IC
U1
－
ROHM
BD5445EFV
Rated
Voltage
－
Inductor
L17, L25
47μH
TOKO
A7503AY-470M
－
R1
10Ω
Resistor
R9A
22kΩ
R17,R25
15Ω
Parts
Capacitor
Electrolytic
Capacitor
Parts No.
Value
Company
ROHM
Product No.
Tolerance
Size
－
9.7mm×6.4mm
±20%
φ11mm×13.5mm
MCR18EZPF10R0
1/4W
F(±1%)
3.2mm×1.6mm
MCR01MZPF2202
1/16W
F(±1%)
1.0mm×0.5mm
MCR18EZPF15R0
1/4W
F(±1%)
3.2mm×1.6mm
Y5V
(+80% /
-20%)
3.2mm×2.5mm
C1
10μF
GRM32DF51H106ZA01
50V
C19, C24
4.7uF
GRM21BB31C475KA87
16V
B(±10%）
2.0mm×1.2mm
GRM31CF11H475ZA01
50V
F (+80% /
-20%)
3.2mm×1.6mm
C15A, C27A
4.7uF
C17A, C25A
0.39uF
GRM32MB11H394KA01
50V
B(±10%）
3.2mm×2.5mm
C14
3.3μF
GRM188B31A335KE15
10V
B(±10%）
1.6mm×0.8mm
MURATA
C4, C5, C7
1μF
GRM185B30J105KE25
6.3V
B(±10%）
1.6mm×0.8mm
C17B, C25B
330pF
GRM188B11H331KA01
50V
B(±10%）
1.6mm×0.8mm
C15B, C17C, C25C,
C27B
470μF
35ZLH470M
35V
±20%
φ10mm×16mm
C8
100uF
16ZLH100M
16V
±20%
φ5mm×11mm
Rubycon
(※1) Please change the following parts, when using RL=6Ω speaker.
Inductor
Capacitor
L17, L25
C17A, C25A
33μH
0.47μF
TOKO
MURATA
A7503AY-330M
GRM32MB11H474KA01
－
50V
±20%
B(±10%）
φ11mm×13.5mm
3.2mm×2.5mm
C17C, C25C
680μF
Rubycon
35ZLH680M
35V
±20%
φ10mm×23mm
(※2) Please change the following parts, when using RL=4Ω speaker.
Inductor
Capacitor
L17, L25
22μH
TOKO
A7503AY-220M
-
±20%
φ11mm×13.5mm
C17A, C25A
0.68μF
MURATA
GRM32NB11H684KA01
50V
B(±10%）
3.2mm×2.5mm
C17C, C25C
1000μF
Rubycon
35ZLH1000M
35V
±20%
φ12.5mm×20mm
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© 2010 ROHM Co., Ltd. All rights reserved.
24/31
2010.05 - Rev.B
Technical Note
BD5445EFV
●Application Circuit Example ( BTL output )
VCC
R1
10Ω
C27A
4.7μF
C1
10μF
1
2
Gain
Control
3
IN1
C4
1μF
IN2
C5
1μF
Differential
Input
4
5
Power down
Control
Mute
Control
28
PWM
Modulator
26
Driver
1
24
7
FILA
22
FILP
21
9
Power down
Control
11
Mute
Control
13
14
L25
33μH
C25A
0.1μF
C17D
0.47μF
8Ω
20
10
Master/Slave
15Ω
C24
4.7μF
REG_G
23
12
C25B
330pF
25
4step
Gain
Amp.
GNDA
CLK/IO
R25
27
Gain
Control
6
C7
1μF
+
8
C8
100μF
R9A
22KΩ
VCCP1
VCCA
C27B
470μF
REG_G
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© 2010 ROHM Co., Ltd. All rights reserved.
C19
4.7μF
REG_G
PWM
Modulator
Driver
2
Oscillator
Control
C14
3.3μF
C17A
0.1μF
19
18
L17
17
33μH
R17
15Ω
C17B
330pF
VCC
16
High Temperature Protection
Output Short Protection
Under Voltage Protection
25/31
VCCP2
15
C15A
4.7μF
C15B
470μF
2010.05 - Rev.B
Technical Note
BD5445EFV
●BOM List ( BTL output )
IC
U1
－
ROHM
BD5445EFV
Rated
Voltage
－
－
9.7mm×6.4mm
Inductor
L17, L25
33μH
TOKO
A7503AY-330M
－
±20%
φ11mm×13.5mm
R1
10Ω
MCR18EZPF10R0
1/4W
F(±1%)
3.2mm×1.6mm
Parts
Resistor
Parts No.
Value
Company
Tolerance
Size
R9A
22kΩ
MCR01MZPF2202
1/16W
F(±1%)
1.0mm×0.5mm
R17,R25
15Ω
MCR18EZPF15R0
1/4W
F(±1%)
3.2mm×1.6mm
C1
10μF
GRM32DF51H106ZA01
50V
Y5V
(+80% /
-20%)
3.2mm×2.5mm
C19, C24
4.7uF
GRM21BB31C475KA87
16V
B(±10%）
2.0mm×1.2mm
C15A, C27A
4.7uF
GRM31CF11H475ZA01
50V
F (+80% /
-20%)
3.2mm×1.6mm
Capacitor
Electrolytic
Capacitor
ROHM
Product No.
MURATA
C17A, C25A
0.1uF
GRM188B31H104KA92
50V
B(±10%）
1.6mm×0.8mm
C17D
0.47uF
GRM21BB31H474MA87
50V
B(±20%）
2.0mm×1.2mm
C14
3.3μF
GRM188B31A335KE15
10V
B(±10%）
1.6mm×0.8mm
C4, C5, C7
1μF
GRM185B30J105KE25
6.3V
B(±10%）
1.6mm×0.8mm
C17B, C25B
330pF
GRM188B11H331KA01
50V
B(±10%）
1.6mm×0.8mm
C15B, C27B
470μF
35ZLH470M
35V
±20%
φ10mm×16mm
C8
100uF
16ZLH100M
16V
±20%
φ5mm×11mm
A7503AY-220M
GRM21BB31H154MA88
－
50V
±20%
B(±20%）
φ11mm×13.5mm
2.0mm×1.2mm
GRM32NB11H684MA01
50V
B(±20%）
3.2mm×2.5mm
50V
±20%
φ11mm×13.5mm
GRM21BB31H224MA88
B(±20%）
2.0mm×1.2mm
GRM21BB31H105MA12
50V
B(±20%）
2.0mm×1.2mm
Rubycon
(※1) Please change the following parts, when using RL=6Ω speaker.
Inductor
Capacitor
L17, L25
C17A, C25A
22μH
0.15μF
C17D
0.68μF
TOKO
MURATA
(※2) Please change the following parts, when using RL=4Ω speaker.
Inductor
Capacitor
L17, L25
15μH
C17A, C25A
0.22μF
C17D
1μF
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© 2010 ROHM Co., Ltd. All rights reserved.
TOKO
MURATA
A7503AY-150M
26/31
2010.05 - Rev.B
Technical Note
BD5445EFV
●Application Circuit Example ( 2.1ch output )
VCC
R1
10Ω
Master
C1
10μF
1
2
Gain
Control
3
IN1
C4
1μF
IN2
C5
1μF
4
5
Power down
Control
22
FILP
21
9
14
C25A
0.39μF
8Ω
C17A
0.39μF
20
Power down
Control
Mute
Control
19
18
Driver
2
REG_G
330pF
VCCP2
47μH
R17
15Ω
+
C17C
470μF
VCC
16
High Temperature Protection
Output Short Protection
Under Voltage Protection
8Ω
L17
17 C17B
Oscillator
Control
C14
3.3μF
C19
4.7μF
REG_G
PWM
Modulator
C25C
470μF
+
24
FILA
15Ω
L25
47μH
C24
4.7μF
REG_G
7
12
C25B
330pF
25
23
13
Master (L input)
26
Driver
1
4step
Gain
Amp.
11
Clock output
R25
27
Gain
Control
PWM
Modulator
C27B
470μF
28
GNDA
10
Mute
Control
VCCP1
VCCA
6
C7
1μF
+
8
C8
100μF
R9A
22KΩ
C27A
4.7μF
15
C15A
4.7μF
C15B
470μF
VCC
R1
10Ω
Slave
C1
10μF
1
2
Gain
Control
3
Differential
Input
IN1
C4
1μF
IN2
C5
1μF
4
5
VCCP1
VCCA
26
Driver
1
Power down
Control
Mute
Control
Clock input
24
23
7
FILA
22
FILP
21
Slave (H input)
10
11
Mute
Control
14
L25
33μH
C25A
0.1μF
C17D
0.47μF
8Ω
20
Power down
Control
13
15Ω
C24
4.7μF
REG_G
GNDA
12
C25B
330pF
25
4step
Gain
Amp.
9
C9A
2200pF
C9B
220pF
R25
27
Gain
Control
PWM
Modulator
C27B
470μF
28
6
C7
1μF
+
8
C8
100μF
R9B
22KΩ
C27A
4.7μF
REG_G
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© 2010 ROHM Co., Ltd. All rights reserved.
C19
4.7μF
REG_G
PWM
Modulator
Driver
2
Oscillator
Control
C14
3.3μF
C17A
0.1μF
19
18
L17
17
33μH
R17
15Ω
C17B
330pF
VCC
16
High Temperature Protection
Output Short Protection
Under Voltage Protection
27/31
VCCP2
15
C15A
4.7μF
C15B
470μF
2010.05 - Rev.B
Technical Note
BD5445EFV
●BOM List ( 2.1ch output )
Parts
Parts No.
Value
Company
Product No.
Resistor
R9B
22kΩ
ROHM
MCR01MZPF2202
Rated
Voltage
1/16W
C9A
2200pF
GRM155R61A222KA01
C9B
220pF
GRM1552C1E221JA01
Capacitor
(※)
MURATA
Tolerance
Size
F(±1%)
1.0mm×0.5mm
10V
X5R(±10%）
1.0mm×0.5mm
25V
CH(±5%）
1.0mm×0.5mm
Parts are written used at "Slave mode" only. Please use same parts written P23 ～ P26.
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© 2010 ROHM Co., Ltd. All rights reserved.
28/31
2010.05 - Rev.B
Technical Note
BD5445EFV
●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, 20, 21, 22, 23）
Ensure a minimum Gnd pin potential in all operating conditions.
4 ) Input terminal
The parasitic elements are formed in the LSI 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. 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 power 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 LSI on a board, pay adequate attention to orientation and placement discrepancies of the LSI. If it
is misinstalled and the power is turned on, the LSI may be damaged. It also may be damaged if it is shorted by a
foreign substance coming between pins of the LSI or between a pin and a power supply or a pin and a Gnd
9 ) Power supply on/off (Pin 1, 15, 16, 27, 28）
In case power supply is started up, PDX (Pin 10) and MUTEX (Pin 11) 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 ) Precautions for Speaker-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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© 2010 ROHM Co., Ltd. All rights reserved.
29/31
2010.05 - Rev.B
Technical Note
BD5445EFV
●Allowable Power Dissipation
6
PCB③ 4.7W
PCB③ 4.7W
Power dissipation :Pd (W)
5
4
PCB② 3.3W
PCB② 3.3W
3
2
PCB① 1.45W
PCB① 1.45W
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（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＝86.2℃/W
PCB②：2-layer board（back copper foil size: 70mm×70mm），θja＝37.8℃/W
PCB③：4-layer board（back copper foil size: 70mm×70mm），θja＝26.6℃/W
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© 2010 ROHM Co., Ltd. All rights reserved.
30/31
2010.05 - Rev.B
Technical Note
BD5445EFV
●Ordering part number
B
D
5
Part No.
4
4
5
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
(Unit : mm)
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© 2010 ROHM Co., Ltd. All rights reserved.
Reel
31/31
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/
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
R1010A