NSC LM4702B Lm4702 overture audio power amplifier series stereo high fidelity 200 volt* driver with mute Datasheet

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 applications. 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.
The LM4702 includes thermal shut down circuitry that activates 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.
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 development) 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.
* Tentative Max Operating voltage for the LM4702A,
LM4702B (in development)
j Wide operating voltage range
± 20V to ± 85V
± 20V to ± 80V
± 20V to ± 75V
LM4702A (in development)
LM4702B (in development)
LM4702C
j Equivalent Noise
3µV
j PSRR
110dB (typ)
j THD
0.001%
Features
n
n
n
n
n
Very high voltage operation
Scalable output power
Minimum external components
External compensation
Thermal Shutdown and Mute
Applications
n
n
n
n
AV receivers
Audiophile power amps
Pro Audio
High voltage industrial applications
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
www.national.com
LM4702 Overture ® Stereo High Fidelity 200 Volt* Driver with Mute
September 2005
LM4702
Typical Application and Connection Diagrams
(Continued)
20158319
FIGURE 1. Typical Audio Amplifier Application Circuit
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2
LM4702
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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LM4702
Absolute Maximum Ratings
Storage Temperature
(Notes 1,
-40˚C to +150˚C
Thermal Resistance
2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage |V+| + |V-|
200V
Differential Input Voltage
+/-6V
Common Mode Input Range
4W
ESD Susceptibility (Note 4)
1.5kV
ESD Susceptibility (Note 5)
200V
Junction Temperature (TJMAX) (Note 9)
1˚C/W
Temperature Range
TMIN ≤ TA ≤ TMAX
−20˚C ≤ TA ≤ +75˚C
Supply Voltage |V+| + |V-|
150˚C
Soldering Information
T Package (10 seconds)
30˚C/W
Operating Ratings (Notes 1, 2)
0.4 Vee to 0.4 Vcc
Power Dissipation (Note 3)
θJA
θJC
LM4702A (in development)
+/-20V ≤ VTOTAL ≤ +/-85V
LM4702B (in development)
+/-20V ≤ VTOTAL ≤ +/-80V
LM4702C
+/-20V ≤ VTOTAL ≤ +/-75V
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
Units
(Limits)
(Note 6) (Notes 7, 8)
ICC
Total Quiescent Power Supply
Current
VCM = 0V, VO = 0V, IO = 0A
THD+N
Total Harmonic Distortion +
Noise
No load, AV = 30dB
VOUT = 14VRMS @ 1kHz
25
30
0.005
RS
Input Bias Resistor
Av
Closed Loop Voltage Gain
Av open
Open Loop Gain
Vin = 1mVrms, f = 1KHz, C = 30pF
Vom
Output Voltage Swing
THD = 0.05%, Freq = 20Hz to 20KHz
51
Vnoise
Output Noise
Rs = 10kΩ, LPF = 30kHz, Av = 30dB
A-weighted
150
IOUT
Output Current
Current from Source to Sink Pins
Imute
Current into Mute Pin
50
mA (max)
%
100
kΩ (max)
26
dB (min)
93
dB
Vrms (min)
300
µV (max)
5.5
3
10
mA(min)
mA (max)
To put part in “play” mode
1.5
1
2
mA(min)
mA (max)
90
µV
XTALK
Channel Separation (Note 11)
f = 1kHz @ Av = 30dB
85
dB
SR
Slew Rate
VIN = 1.2VP-P, f = 10kHz square Wave,
Outputs shorted
15
V/µs
VOS
Input Offset Voltage
VCM = 0V, IO = 0mA
10
IB
Input Bias Current
VCM = 0V, IO = 0mA
500
PSRR
Power Supply Rejection Ratio
Rs = 1k, f = 100Hz,
Vripple = 1Vrms, Input Referred
110
35
mV (max)
95
dB (min)
nA
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
Units
(Limits)
(Note 6) (Notes 7, 8)
ICC
Total Quiescent Power Supply
Current
VCM = 0V, VO = 0V, IO = 0A
THD+N
Total Harmonic Distortion +
Noise
No load, AV = 30dB
VOUT = 10VRMS @ 1kHz
RS
Input Bias Resistor
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22
0.005
50
4
30
mA (max)
%
100
kΩ (max)
LM4702
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
Av open
Open Loop Gain
Vin = 1mVrms, f = 1KHz, C = 30pF
26
Vom
Output Voltage Swing
THD = 0.05%, Freq = 20Hz to 20KHz
33
Vnoise
Output Noise
Rs = 10kΩ, LPF = 30kHz, Av = 30dB
A-weighted
150
IOUT
Output Current
Outputs Shorted
5.2
Imute
Current into Mute Pin
To put part in “play” mode
1.5
XTALK
Channel Separation (Note 11)
f = 1kHz at Av = 30dB
85
dB
SR
Slew Rate
VIN = 1.2VP-P, f = 10kHz square Wave,
Outputs shorted
15
V/µs
93
dB
Vrms (min)
300
90
VOS
Input Offset Voltage
VCM = 0V, IO = 0mA
10
IB
Input Bias Current
VCM = 0V, IO = 0mA
500
PSRR
Power Supply Rejection Ratio
Rs = 1k, f = 100Hz,
Vripple = 1Vrms, Input Referred
110
dB (min)
µV (max)
µV
3
10
mA(min)
mA (max)
1
2
mA(min)
mA (max)
35
mV (max)
95
dB (min)
nA
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
Units
(Limits)
(Note 6) (Notes 7, 8)
ICC
Total Quiescent Power Supply
Current
VCM = 0V, VO = 0V, IO = 0A
THD+N
Total Harmonic Distortion +
Noise
No load, AV = 30dB
VOUT = 20VRMS @ 1kHz
RS
Input Bias Resistor
27
TBD
mA (max)
0.003
TBD
% (max)
50
TBD
kΩ (max)
TBD
dB (min)
Av
Closed Loop Voltage Gain
Av open
Open Loop Gain
Vin = 1mVrms, f = 1KHz, C = 30pF
93
Vom
Output Voltage Swing
THD = 0.05%, Freq = 20Hz to 20KHz
54
TBD
Vrms (min)
Vnoise
Output Noise
Rs = 10kΩ, LPF = 30kHz, Av = 30dB
A-weighted
150
90
TBD
TBD
µV (max)
IOUT
Output Current
Outputs Shorted
5.5
TBD
TBD
mA(min)
mA (max)
Imute
Current into Mute Pin
To put part in “play” mode
1.5
TBD
TBD
mA(min)
mA (max)
XTALK
Channel Separation (Note 11)
f = 1kHz at Av = 30dB
85
TBD
dB (min)
SR
Slew Rate
VIN = 1.2VP-P, f = 10kHz square Wave,
Outputs shorted
17
TBD
V/µs (min)
dB
VOS
Input Offset Voltage
VCM = 0V, IO = 0mA
7
TBD
mV (max)
IB
Input Bias Current
VCM = 0V, IO = 0mA
350
TBD
nA (max)
PSRR
Power Supply Rejection Ratio
Rs = 1k, f = 100Hz,
Vripple = 1Vrms, Input Referred
110
TBD
dB (min)
5
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LM4702
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
Units
(Limits)
(Note 6) (Notes 7, 8)
ICC
Total Quiescent Power Supply
Current
VCM = 0V, VO = 0V, IO = 0A
THD+N
Total Harmonic Distortion +
Noise
No load, AV = 30dB
VOUT = 20VRMS @ 1kHz
27
TBD
mA (max)
0.001
TBD
% (max)
TBD
kΩ (max)
TBD
dB (min)
RS
Input Bias Resistor
Av
Closed Loop Voltage Gain
Av open
Open Loop Gain
Vin = 1mVrms, f = 1KHz, C = 30pF
Vom
Output Voltage Swing
THD = 0.05%, Freq = 20Hz to 20KHz
57
TBD
Vrms (min)
Vnoise
Output Noise
Rs = 10kΩ, LPF = 30kHz, Av = 30dB
A-weighted
100
80
TBD
TBD
µV (max)
IOUT
Output Current
Outputs Shorted
5.5
TBD
TBD
mA(min)
mA (max)
Imute
Current into Mute Pin
To put part in “play” mode
1.5
TBD
TBD
mA(min)
mA (max)
XTALK
Channel Separation (Note 11)
f = 1kHz at Av = 30dB
SR
Slew Rate
VIN = 1.2VP-P, f = 10kHz square Wave,
Outputs shorted
VOS
Input Offset Voltage
50
93
dB
90
TBD
dB (min)
TBD
TBD
V/µs (min)
VCM = 0V, IO = 0mA
5
TBD
mV (max)
IB
Input Bias Current
VCM = 0V, IO = 0mA
150
TBD
nA (max)
PSRR
Power Supply Rejection Ratio
Rs = 1k, f = 100Hz,
Vripple = 1Vrms, Input Referred
110
TBD
dB (min)
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 TJMAX, θJC, and the ambient temperature TA. The maximum
allowable power dissipation is PDMAX = (TJMAX -TA)/θJC or the number given in the Absolute Maximum Ratings, whichever is lower. For the LM4702, TJMAX = 150˚C
and the typical θJC is 1˚C/W. Refer to the Thermal Considerations section for more information.
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, θCS (case to sink) is increased, but the heat sink will be electrically isolated from
Vee.
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6
THD+N vs Output Voltage
VDD = ± 75V, f = 1kHz, outputs shorted
THD+N vs Output Voltage
VDD = ± 50V, f = 1kHz, outputs shorted
20158308
20158338
THD+N vs Frequency
VDD = ± 75V, VOUT = 14Vrms, outputs shorted
THD+N vs Frequency
VDD = ± 50V, VOUT = 10Vrms, outputs shorted
20158310
20158339
Crosstalk vs Frequency
VDD = ± 75V
Crosstalk vs Frequency
VDD = ± 50V
20158335
20158336
7
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LM4702
Typical Performance Characteristics for LM4702C
LM4702
Typical Performance Characteristics for LM4702C
+PSRR vs Frequency
VDD = ± 50V, RS = 1kΩ, Ripple on VCC
−PSRR vs Frequency
VDD = ± 50V, RS = 1kΩ, Ripple on Vee
20158331
20158333
+PSRR vs Frequency
VDD = ± 75V, RS = 1kΩ, Ripple on VCC
−PSRR vs Frequency
VDD = ± 75V, RS = 1kΩ, Ripple on Vee
20158332
20158334
Open Loop and Phase
Upper-Phase, Lower-Gain
20158337
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(Continued)
8
LM4702
Test Circuit
20158303
FIGURE 1.
9
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LM4702
Application Information
The thermal resistance from the die to the outside air, θJA
(junction to ambient), is a combination of three thermal resistances, 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 Thermacote 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 temperature drops are analogous to voltage drops, the power
dissipation out of the LM4702 is equal to the following:
(1)
PDMAX = (TJMAX−TAMB) / θJA
MUTE FUNCTION
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 recalculated accordingly. It is not recommended to flow more than
2mA of current into the mute pin because damage to the
LM4702 may occur.
where TJMAX = 150˚C, TAMB is the system ambient temperature 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 resistance, 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.
θSA = [(TJMAX−TAMB)−PDMAX(θJC +θCS)] / PDMAX (2)
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 between 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.
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.
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.
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:
(3)
AV = 1 + Rf / Ri (V/V)
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.
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:
(4)
fi = 1 / (2πRiCi) (Hz)
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
POWER DISSIPATION AND HEAT SINKING
When in “play” mode, the LM4702 draws a constant amount
of current, regardless of the input signal amplitude. Consequently, 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).
DETERMINING THE CORRECT HEAT SINK
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 transistors. This will keep the temperature of the transistors lower.
A second recommended method is to use emitter degeneration resistors (see Re1, Re2, Re3, Re4 in Figure 1). As
current increases, the voltage across the emitter degeneration resistor also increases, which decreases the voltage
across the base and emitter. This mechanism helps to limit
the current and counteracts thermal runaway.
A third recommended method is to use a “Vbe multiplier” to
bias the bipolar output stage (see Figure 1). The Vbe multiplier 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 transistors, which counteracts thermal runaway.
(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.
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 temperature 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 transistors used in the output stage.
11
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LM4702
Application Information
LM4702
LM4702 Demo Board Artwork
Top Overlay
20158330
Top Layer
20158329
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12
LM4702
LM4702 Demo Board Artwork
(Continued)
Bottom Layer
20158328
13
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LM4702
Revision History
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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
8/31/05
First WEB released of the datasheet.
1.3
9/2/05
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
9/14/05
Changed TM to R ( Overture R) in the
doc title (per Kevin C), Naomi Mitchell
called Kevin about it.
1.6
9/15/05
Re-released D/S to the WEB with
Overture “R”.
14
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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Fax: 81-3-5639-7507
Email: [email protected]
Tel: 81-3-5639-7560
LM4702 Overture ® Stereo High Fidelity 200 Volt* Driver with Mute
Physical Dimensions