LM4702B [NSC]
LM4702 Overture Audio Power Amplifier Series Stereo High Fidelity 200 Volt* Driver with Mute; LM4702序曲音频功率放大器系列立体声高保真200伏*驱动器与静音
| 型号： | LM4702B |
| 厂家： | 
National Semiconductor |
| 描述： | LM4702 Overture Audio Power Amplifier Series Stereo High Fidelity 200 Volt* Driver with Mute |
| 文件： | 总15页 (文件大小：821K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
September 2005
LM4702 Overture® Audio Power Amplifier Series
Stereo High Fidelity 200 Volt* Driver with Mute
General Description
Key Specifications
The LM4702 is a high fidelity audio power amplifier driver
designed for demanding consumer and pro-audio applica-
tions. Amplifier output power may be scaled by changing the
supply voltage and number of output devices. The LM4702
is capable of delivering in excess of 300 watts per channel
single ended into an 8 ohm load in the presence of 10% high
line headroom and 20% supply regulation.
j
Wide operating voltage range
LM4702A (in development)
LM4702B (in development)
LM4702C
20V to 85V
20V to 80V
20V to 75V
3µV
j
j
j
Equivalent Noise
PSRR
110dB (typ)
0.001%
The LM4702 includes thermal shut down circuitry that acti-
vates when the die temperature exceeds 150˚C. The
LM4702’s mute function, when activated, mutes the input
drive signal and forces the amplifier output to a quiescent
state.
THD
Features
n Very high voltage operation
n Scalable output power
n Minimum external components
n External compensation
n Thermal Shutdown and Mute
The LM4702 is available in 3 grades that span a wide range
of applications and performance levels. The LM4702C is
targeted at high volume applications. The LM4702B (in de-
velopment) includes a higher voltage rating along with the
tighter specifications. The LM4702A (in development) is the
premium part with the highest voltage rating, fully specified
with limits over voltage and temperature, and is offered in a
military 883 compliant TO-3 package.
Applications
n AV receivers
n Audiophile power amps
n Pro Audio
n High voltage industrial applications
*
Tentative Max Operating voltage for the LM4702A,
LM4702B (in development)
Typical Application and Connection Diagrams
20158302
Plastic Package — 15 Lead TO-220
(for LM4702; LM4702B, in development)
20158320
Metal Can — 15 Lead TO-3
(for LM4702A, in development)
20158319
FIGURE 1. Typical Audio Amplifier Application Circuit
™
™
SPiKe Protection and Overture are trademarks of National Semiconductor Corporation.
© 2005 National Semiconductor Corporation
DS201583
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Typical Application and Connection Diagrams (Continued)
20158319
FIGURE 1. Typical Audio Amplifier Application Circuit
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2
Connection Diagram
Plastic Package (For B and C) (Note 13)
20158301
Top View
Order Number LM4702T(B & C)
See NS Package Number TA15A
3
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Absolute Maximum Ratings (Notes 1,
2)
Storage Temperature
-40˚C to +150˚C
Thermal Resistance
θJA
θJC
30˚C/W
1˚C/W
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage |V+| + |V-|
Differential Input Voltage
200V
Operating Ratings (Notes 1, 2)
Temperature Range
+/-6V
Common Mode Input Range
Power Dissipation (Note 3)
ESD Susceptibility (Note 4)
ESD Susceptibility (Note 5)
Junction Temperature (TJMAX) (Note 9)
Soldering Information
0.4 Vee to 0.4 Vcc
TMIN ≤ TA ≤ TMAX
Supply Voltage |V+| + |V-|
LM4702A (in development)
LM4702B (in development)
LM4702C
−20˚C ≤ TA ≤ +75˚C
4W
1.5kV
200V
+/-20V ≤ VTOTAL ≤ +/-85V
+/-20V ≤ VTOTAL ≤ +/-80V
+/-20V ≤ VTOTAL ≤ +/-75V
150˚C
T Package (10 seconds)
260˚C
Electrical Characteristics (LM4702C) Vcc = +75V, Vee = –75V (Notes 1, 2)
The following specifications apply for IMUTE = 1.5mA, unless otherwise specified. Limits apply for TA = 25˚C.
Symbol
Parameter
Conditions
LM4702
Typical Limit
(Note 6) (Notes 7, 8)
Units
(Limits)
ICC
Total Quiescent Power Supply VCM = 0V, VO = 0V, IO = 0A
Current
25
0.005
50
30
mA (max)
%
THD+N
Total Harmonic Distortion +
Noise
No load, AV = 30dB
@
VOUT = 14VRMS 1kHz
RS
Input Bias Resistor
Closed Loop Voltage Gain
Open Loop Gain
100
26
kΩ (max)
dB (min)
dB
Av
Av open
Vom
Vin = 1mVrms, f = 1KHz, C = 30pF
THD = 0.05%, Freq = 20Hz to 20KHz
93
51
Output Voltage Swing
Vrms (min)
µV (max)
µV
150
90
300
Rs = 10kΩ, LPF = 30kHz, Av = 30dB
A-weighted
Vnoise
IOUT
Output Noise
Output Current
Current from Source to Sink Pins
To put part in “play” mode
5.5
3
10
1
mA(min)
mA (max)
mA(min)
mA (max)
dB
Imute
Current into Mute Pin
1.5
2
@
XTALK
SR
Channel Separation (Note 11) f = 1kHz Av = 30dB
85
15
Slew Rate
VIN = 1.2VP-P, f = 10kHz square Wave,
V/µs
Outputs shorted
VOS
IB
Input Offset Voltage
Input Bias Current
VCM = 0V, IO = 0mA
VCM = 0V, IO = 0mA
10
35
95
mV (max)
nA
500
110
PSRR
Power Supply Rejection Ratio Rs = 1k, f = 100Hz,
Vripple = 1Vrms, Input Referred
dB (min)
Electrical Characteristics (LM4702C) Vcc = +50V, Vee = –50V (Notes 1, 2)
The following specifications apply for IMUTE = 1.5mA, unless otherwise specified. Limits apply for TA = 25˚C.
Symbol
Parameter
Conditions
LM4702
Typical Limit
(Note 6) (Notes 7, 8)
Units
(Limits)
ICC
Total Quiescent Power Supply VCM = 0V, VO = 0V, IO = 0A
Current
22
0.005
50
30
mA (max)
%
THD+N
RS
Total Harmonic Distortion +
Noise
No load, AV = 30dB
@
VOUT = 10VRMS 1kHz
Input Bias Resistor
100
kΩ (max)
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4
Electrical Characteristics (LM4702C) Vcc = +50V, Vee = –50V (Notes 1,
2) (Continued)
The following specifications apply for IMUTE = 1.5mA, unless otherwise specified. Limits apply for TA = 25˚C.
Symbol
Parameter
Conditions
LM4702
Typical Limit
Units
(Limits)
(Note 6) (Notes 7, 8)
Av
Closed Loop Voltage Gain
Open Loop Gain
26
dB (min)
dB
Av open
Vom
Vin = 1mVrms, f = 1KHz, C = 30pF
THD = 0.05%, Freq = 20Hz to 20KHz
93
33
Output Voltage Swing
Vrms (min)
µV (max)
µV
150
90
300
Rs = 10kΩ, LPF = 30kHz, Av = 30dB
A-weighted
Vnoise
Output Noise
3
10
1
mA(min)
mA (max)
mA(min)
mA (max)
dB
IOUT
Imute
Output Current
Outputs Shorted
5.2
1.5
Current into Mute Pin
To put part in “play” mode
2
XTALK
SR
Channel Separation (Note 11) f = 1kHz at Av = 30dB
85
15
Slew Rate
VIN = 1.2VP-P, f = 10kHz square Wave,
V/µs
Outputs shorted
VOS
IB
Input Offset Voltage
Input Bias Current
VCM = 0V, IO = 0mA
VCM = 0V, IO = 0mA
10
35
95
mV (max)
nA
500
110
PSRR
Power Supply Rejection Ratio Rs = 1k, f = 100Hz,
Vripple = 1Vrms, Input Referred
dB (min)
Electrical Characteristics (LM4702B) Vcc = +80V, Vee = –80V (Pre-release
information) (Notes 1, 2)
The following specifications apply for IMUTE = 1.5mA, unless otherwise specified. Limits apply for TA = 25˚C.
Symbol
Parameter
Conditions
LM4702
Typical Limit
(Note 6) (Notes 7, 8)
Units
(Limits)
ICC
Total Quiescent Power Supply VCM = 0V, VO = 0V, IO = 0A
Current
27
0.003
50
TBD
mA (max)
% (max)
THD+N
Total Harmonic Distortion +
Noise
No load, AV = 30dB
TBD
@
VOUT = 20VRMS 1kHz
RS
Input Bias Resistor
Closed Loop Voltage Gain
Open Loop Gain
TBD
TBD
kΩ (max)
dB (min)
dB
Av
Av open
Vom
Vnoise
Vin = 1mVrms, f = 1KHz, C = 30pF
THD = 0.05%, Freq = 20Hz to 20KHz
Rs = 10kΩ, LPF = 30kHz, Av = 30dB
A-weighted
93
54
Output Voltage Swing
Output Noise
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
Vrms (min)
150
90
µV (max)
mA(min)
mA (max)
mA(min)
IOUT
Imute
Output Current
Outputs Shorted
5.5
1.5
Current into Mute Pin
To put part in “play” mode
mA (max)
dB (min)
V/µs (min)
XTALK
SR
Channel Separation (Note 11) f = 1kHz at Av = 30dB
85
17
Slew Rate
VIN = 1.2VP-P, f = 10kHz square Wave,
Outputs shorted
VOS
IB
Input Offset Voltage
Input Bias Current
VCM = 0V, IO = 0mA
VCM = 0V, IO = 0mA
7
TBD
TBD
TBD
mV (max)
nA (max)
dB (min)
350
110
PSRR
Power Supply Rejection Ratio Rs = 1k, f = 100Hz,
Vripple = 1Vrms, Input Referred
5
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Electrical Characteristics (LM4702A) Vcc = +85V, Vee = –85V (Pre-release
information) (Notes 1, 2)
The following specifications apply for IMUTE = 1.5mA, unless otherwise specified. Limits apply for TA = 25˚C.
Symbol
Parameter
Conditions
LM4702
Typical Limit
(Note 6) (Notes 7, 8)
Units
(Limits)
ICC
Total Quiescent Power Supply VCM = 0V, VO = 0V, IO = 0A
Current
27
0.001
50
TBD
mA (max)
% (max)
THD+N
Total Harmonic Distortion +
Noise
No load, AV = 30dB
TBD
@
VOUT = 20VRMS 1kHz
RS
Input Bias Resistor
Closed Loop Voltage Gain
Open Loop Gain
TBD
TBD
kΩ (max)
dB (min)
dB
Av
Av open
Vom
Vnoise
Vin = 1mVrms, f = 1KHz, C = 30pF
THD = 0.05%, Freq = 20Hz to 20KHz
Rs = 10kΩ, LPF = 30kHz, Av = 30dB
A-weighted
93
57
Output Voltage Swing
Output Noise
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
Vrms (min)
100
80
µV (max)
mA(min)
mA (max)
mA(min)
IOUT
Imute
Output Current
Outputs Shorted
5.5
1.5
Current into Mute Pin
To put part in “play” mode
mA (max)
dB (min)
V/µs (min)
XTALK
SR
Channel Separation (Note 11) f = 1kHz at Av = 30dB
90
Slew Rate
VIN = 1.2VP-P, f = 10kHz square Wave,
TBD
Outputs shorted
VOS
IB
Input Offset Voltage
Input Bias Current
VCM = 0V, IO = 0mA
VCM = 0V, IO = 0mA
5
TBD
TBD
TBD
mV (max)
nA (max)
dB (min)
150
110
PSRR
Power Supply Rejection Ratio Rs = 1k, f = 100Hz,
Vripple = 1Vrms, Input Referred
Note 1: All voltages are measured with respect to the ground pins, unless otherwise specified.
Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test condition which
guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit
is given. However, the typical value is a good indication of device’s performance.
Note 3: The maximum power dissipation must be de-rated at elevated temperatures and is dictated by T
, θ , and the ambient temperature T . The maximum
A
JMAX JC
allowable power dissipation is P
= (T
-T )/θ or the number given in the Absolute Maximum Ratings, whichever is lower. For the LM4702, T
= 150˚C
DMAX
JMAX
A
JC
JMAX
and the typical θ is 1˚C/W. Refer to the Thermal Considerations section for more information.
JC
Note 4: Human body model, 100pF discharged through a 1.5kΩ resistor.
Note 5: Machine Model: a 220pF - 240pF discharged through all pins.
Note 6: Typical specifications are measured at 25˚C and represent the parametric norm.
Note 7: Tested limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 8: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Note 9: The maximum operating junction temperature is 150˚C.
Note 10: PCB layout will affect cross talk. It is recommended that input and output traces be separated by as much distance as possible. Return ground traces from
outputs should be independent back to a single ground point and use as wide of traces as possible.
Note 11: The TA15A is a non-isolated package. The package’s metal back and any heat sink to which it is mounted are connected to the Vee potential when using
only thermal compound. If a mica washer is used in addition to thermal compound, θ (case to sink) is increased, but the heat sink will be electrically isolated from
CS
Vee.
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6
Typical Performance Characteristics for LM4702C
THD+N vs Output Voltage
THD+N vs Output Voltage
VDD
=
50V, f = 1kHz, outputs shorted
VDD
=
75V, f = 1kHz, outputs shorted
20158308
20158338
THD+N vs Frequency
THD+N vs Frequency
VDD
=
50V, VOUT = 10Vrms, outputs shorted
VDD
=
75V, VOUT = 14Vrms, outputs shorted
20158310
20158339
Crosstalk vs Frequency
Crosstalk vs Frequency
VDD
=
50V
VDD
=
75V
20158335
20158336
7
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Typical Performance Characteristics for LM4702C (Continued)
+PSRR vs Frequency
50V, RS = 1kΩ, Ripple on VCC
−PSRR vs Frequency
VDD = 50V, RS = 1kΩ, Ripple on Vee
VDD
=
20158331
20158333
+PSRR vs Frequency
−PSRR vs Frequency
VDD
=
75V, RS = 1kΩ, Ripple on VCC
VDD
=
75V, RS = 1kΩ, Ripple on Vee
20158332
20158334
Open Loop and Phase
Upper-Phase, Lower-Gain
20158337
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Test Circuit
20158303
FIGURE 1.
9
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Application Information
MUTE FUNCTION
The thermal resistance from the die to the outside air, θJA
(junction to ambient), is a combination of three thermal re-
sistances, θJC (junction to case), θCS (case to sink), and θSA
(sink to ambient). The thermal resistance, θJC (junction to
case), of the LM4702T is 0.8˚C/W. Using Thermalloy Ther-
macote thermal compound, the thermal resistance, θCS
(case to sink), is about 0.2˚C/W. Since convection heat flow
(power dissipation) is analogous to current flow, thermal
resistance is analogous to electrical resistance, and tem-
perature drops are analogous to voltage drops, the power
dissipation out of the LM4702 is equal to the following:
The mute function of the LM4702 is controlled by the amount
of current that flows into the mute pin. If there is less than
1mA of current flowing into the mute pin, the part will be in
mute. This can be achieved by shorting the mute pin to
ground or by floating the mute pin. If there is between 1mA
and 2mA of current flowing into the mute pin, the part will be
in “play” mode. This can be done by connecting a power
supply (Vmute) to the mute pin through a resistor (Rm). The
current into the mute pin can be determined by the equation
Imute = (Vmute – 2.9) / Rm. For example, if a 5V power
supply is connected through a 1.4k resistor to the mute pin,
then the mute current will be 1.5mA, at the center of the
specified range. It is also possible to use Vcc as the power
supply for the mute pin, though Rm will have to be recalcu-
lated accordingly. It is not recommended to flow more than
2mA of current into the mute pin because damage to the
LM4702 may occur.
PDMAX = (TJMAX−TAMB) / θJA
(1)
where TJMAX = 150˚C, TAMB is the system ambient tempera-
ture and θJA = θJC + θCS + θSA
.
It is highly recommended to switch between mute and “play”
modes rapidly. This is accomplished most easily through
using a toggle switch that alternatively connects the mute pin
through a resistor to either ground or the mute pin power
supply. Slowly increasing the mute current may result in
undesired voltages on the outputs of the LM4702, which can
damage an attached speaker.
20158355
Once the maximum package power dissipation has been
calculated using equation 2, the maximum thermal resis-
tance, θSA, (heat sink to ambient) in ˚C/W for a heat sink can
be calculated. This calculation is made using equation 4
which is derived by solving for θSA in equation 3.
THERMAL PROTECTION
The LM4702 has a sophisticated thermal protection scheme
to prevent long-term thermal stress of the device. When the
temperature on the die exceeds 150˚C, the LM4702 shuts
down. It starts operating again when the die temperature
drops to about 145˚C, but if the temperature again begins to
rise, shutdown will occur again above 150˚C. Therefore, the
device is allowed to heat up to a relatively high temperature
if the fault condition is temporary, but a sustained fault will
cause the device to cycle in a Schmitt Trigger fashion be-
tween the thermal shutdown temperature limits of 150˚C and
145˚C. This greatly reduces the stress imposed on the IC by
thermal cycling, which in turn improves its reliability under
sustained fault conditions.
θSA = [(TJMAX−TAMB)−PDMAX(θJC +θCS)] / PDMAX (2)
Again it must be noted that the value of θSA is dependent
upon the system designer’s amplifier requirements. If the
ambient temperature that the audio amplifier is to be working
under is higher than 25˚C, then the thermal resistance for the
heat sink, given all other things are equal, will need to be
smaller.
PROPER SELECTION OF EXTERNAL COMPONENTS
Proper selection of external components is required to meet
the design targets of an application. The choice of external
component values that will affect gain and low frequency
response are discussed below.
Since the die temperature is directly dependent upon the
heat sink used, the heat sink should be chosen so that
thermal shutdown is not activated during normal operation.
Using the best heat sink possible within the cost and space
constraints of the system will improve the long-term reliability
of any power semiconductor device, as discussed in the
Determining the Correct Heat Sink section.
The gain of each amplifier is set by resistors Rf and Ri for the
non-inverting configuration shown in Figure 1. The gain is
found by Equation (3) below:
AV = 1 + Rf / Ri (V/V)
(3)
POWER DISSIPATION AND HEAT SINKING
For best noise performance, lower values of resistors are
used. A value of 1kΩ is commonly used for Ri and then
setting the value of Rf for the desired gain. For the LM4702
the gain should be set no lower than 26dB. Gain settings
below 26dB may experience instability.
When in “play” mode, the LM4702 draws a constant amount
of current, regardless of the input signal amplitude. Conse-
quently, the power dissipation is constant for a given supply
voltage and can be computed with the equation PDMAX = Icc
* (Vcc – Vee). For a quick calculation of PDMAX, approximate
the current to be 25mA and multiply it by the total supply
voltage (the current varies slightly from this value over the
operating range).
The combination of Ri with Ci (see Figure 1) creates a high
pass filter. The low frequency response is determined by
these two components. The -3dB point can be found from
Equation (4) shown below:
fi = 1 / (2πRiCi) (Hz)
(4)
DETERMINING THE CORRECT HEAT SINK
If an input coupling capacitor is used to block DC from the
inputs as shown in Figure 5, there will be another high pass
filter created with the combination of CIN and RIN. When
using a input coupling capacitor RIN is needed to set the DC
The choice of a heat sink for a high-power audio amplifier is
made entirely to keep the die temperature at a level such
that the thermal protection circuitry is not activated under
normal circumstances.
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10
One of the recommended methods of preventing thermal
runaway is to use a heat sink on the bipolar output transis-
tors. This will keep the temperature of the transistors lower.
A second recommended method is to use emitter degenera-
tion resistors (see Re1, Re2, Re3, Re4 in Figure 1). As
current increases, the voltage across the emitter degenera-
tion resistor also increases, which decreases the voltage
across the base and emitter. This mechanism helps to limit
the current and counteracts thermal runaway.
Application Information (Continued)
bias point on the amplifier’s input terminal. The resulting
-3dB frequency response due to the combination of CIN and
RIN can be found from Equation (5) shown below:
fIN = 1 / (2πRINCIN) (Hz)
(5)
With large values of RIN oscillations may be observed on the
outputs when the inputs are left floating. Decreasing the
value of RIN or not letting the inputs float will remove the
oscillations. If the value of RIN is decreased then the value of
CIN will need to increase in order to maintain the same -3dB
frequency response.
A third recommended method is to use a “Vbe multiplier” to
bias the bipolar output stage (see Figure 1). The Vbe multi-
plier consists of a bipolar transistor (Qmult, see Figure 1)
and two resistors, one from the base to the collector (Rb2,
Rb4, see Figure 1) and one from the base to the emitter
(Rb1, Rb3, see Figure 1). The voltage from the collector to
the emitter (also the bias voltage of the output stage) is
Vbias = Vbe(1+Rb2/Rb1), which is why this circuit is called
the Vbe multiplier. When Vbe multiplier transistor (Qmult,
see Figure 1) is mounted to the same heat sink as the bipolar
output transistors, its temperature will track that of the output
transistors. Its Vbe is dependent upon temperature as well,
and so it will draw more current as the output transistors heat
it up. This will limit the base current into the output transis-
tors, which counteracts thermal runaway.
AVOIDING THERMAL RUNAWAY WHEN USING
BIPOLAR OUTPUT STAGES
When using a bipolar output stage with the LM4702 (as in
Figure 1), the designer must beware of thermal runaway.
Thermal runaway is a result of the temperature dependence
of Vbe (an inherent property of the transistor). As tempera-
ture increases, Vbe decreases. In practice, current flowing
through a bipolar transistor heats up the transistor, which
lowers the Vbe. This in turn increases the current again, and
the cycle repeats. If the system is not designed properly, this
positive feedback mechanism can destroy the bipolar tran-
sistors used in the output stage.
11
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LM4702 Demo Board Artwork
Top Overlay
20158330
Top Layer
20158329
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12
LM4702 Demo Board Artwork (Continued)
Bottom Layer
20158328
13
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Revision History
Rev
Date
Description
1.0
8/18/05
Input corrected data under the Typical
and Limit columns on all the 4 EC tables
(per Kevin H.).
1.1
8/22/05
Changed limits back on LM4702A/B/C to
85V/80V/75V respectively (under Key
Spec...)
1.2
1.3
8/31/05
9/2/05
First WEB released of the datasheet.
Due to miscommunication with the ASSY
plant (EM), the datasheet needs to be
taken off the WEB for now (per Robin
Simpson).
1.4
9/09/05
Taken out Limits on Vom (under the
+75V and +50V.. LM4702C EC tables),
then released D/S to the WEB (per Robin
Simpson).
1.5
1.6
9/14/05
9/15/05
Changed TM to R ( Overture R) in the
doc title (per Kevin C), Naomi Mitchell
called Kevin about it.
Re-released D/S to the WEB with
Overture “R”.
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14
Physical Dimensions inches (millimeters) unless otherwise noted
Non-Isolated TO-220 15-Lead Package
Order Number LM4702T(B&C)
NS Package Number TA15A
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves
the right at any time without notice to change said circuitry and specifications.
For the most current product information visit us at www.national.com.
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National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products
Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain
no ‘‘Banned Substances’’ as defined in CSP-9-111S2.
Leadfree products are RoHS compliant.
National Semiconductor
Americas Customer
Support Center
National Semiconductor
Europe Customer Support Center
Fax: +49 (0) 180-530 85 86
National Semiconductor
Asia Pacific Customer
Support Center
National Semiconductor
Japan Customer Support Center
Fax: 81-3-5639-7507
Email: new.feedback@nsc.com
Tel: 1-800-272-9959
Email: europe.support@nsc.com
Deutsch Tel: +49 (0) 69 9508 6208
English Tel: +44 (0) 870 24 0 2171
Français Tel: +33 (0) 1 41 91 8790
Email: ap.support@nsc.com
Email: jpn.feedback@nsc.com
Tel: 81-3-5639-7560
www.national.com
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