LM4702A NSC [National Semiconductor], LM4702A Datasheet

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LM4702A

Manufacturer Part Number
LM4702A
Description
LM4702 Overture Audio Power Amplifier Series Stereo High Fidelity 200 Volt* Driver with Mute
Manufacturer
NSC [National Semiconductor]
Datasheet
© 2005 National Semiconductor Corporation
LM4702 Overture
Stereo High Fidelity 200 Volt* Driver with Mute
General Description
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.
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.
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.
* Tentative Max Operating voltage for the LM4702A,
LM4702B (in development)
Typical Application and Connection Diagrams
SPiKe
FIGURE 1. Typical Audio Amplifier Application Circuit
Protection and Overture
are trademarks of National Semiconductor Corporation.
®
DS201583
Audio Power Amplifier Series
20158319
Key Specifications
Features
n Very high voltage operation
n Scalable output power
n Minimum external components
n External compensation
n Thermal Shutdown and Mute
Applications
n AV receivers
n Audiophile power amps
n Pro Audio
n High voltage industrial applications
j
j
j
j
LM4702A (in development)
LM4702B (in development)
LM4702C
Wide operating voltage range
Equivalent Noise
PSRR
THD
(for LM4702; LM4702B, in development)
Plastic Package — 15 Lead TO-220
(for LM4702A, in development)
Metal Can — 15 Lead TO-3
20158320
20158302
September 2005
±
±
±
20V to
20V to
20V to
www.national.com
110dB (typ)
0.001%
±
±
±
3µV
85V
80V
75V

Related parts for LM4702A

LM4702A Summary of contents

Page 1

... 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 ...

Page 2

Typical Application and Connection Diagrams FIGURE 1. Typical Audio Amplifier Application Circuit www.national.com (Continued) 2 20158319 ...

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Connection Diagram Plastic Package (For B and C) (Note 13) Top View Order Number LM4702T(B & C) See NS Package Number TA15A 3 20158301 www.national.com ...

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... Thermal Resistance θ JA θ JC Operating Ratings 200V +/-6V Temperature Range 0.4 Vee to 0.4 Vcc ≤ MIN 4W Supply Voltage |V 1.5kV LM4702A (in development) 200V LM4702B (in development) 150˚C LM4702C 260˚C = 1.5mA, unless otherwise specified. Limits apply for T MUTE Conditions load, A ...

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Electrical Characteristics (LM4702C) Vcc = +50V, Vee = –50V 2) (Continued) The following specifications apply for I Symbol Parameter Av Closed Loop Voltage Gain Av open Open Loop Gain Vom Output Voltage Swing Vnoise Output Noise I Output Current OUT ...

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... Electrical Characteristics (LM4702A) Vcc = +85V, Vee = –85V (Pre-release information) (Notes 1, 2) The following specifications apply for I Symbol Parameter I Total Quiescent Power Supply CC Current THD+N Total Harmonic Distortion + Noise R Input Bias Resistor S Av Closed Loop Voltage Gain Av open Open Loop Gain Vom ...

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Typical Performance Characteristics for LM4702C THD+N vs Output Voltage ± 50V 1kHz, outputs shorted DD THD+N vs Frequency ± 50V 10Vrms, outputs shorted DD OUT Crosstalk vs Frequency ± 50V ...

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Typical Performance Characteristics for LM4702C +PSRR vs Frequency ± 50V 1kΩ, Ripple +PSRR vs Frequency ± 75V 1kΩ, Ripple Open Loop and Phase Upper-Phase, ...

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Test Circuit FIGURE 1. 9 20158303 www.national.com ...

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Application Information 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 ...

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Application Information bias point on the amplifier’s input terminal. The resulting -3dB frequency response due to the combination can be found from Equation (5) shown below (2π (Hz ...

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LM4702 Demo Board Artwork www.national.com Top Overlay 20158330 Top Layer 20158329 12 ...

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LM4702 Demo Board Artwork (Continued) Bottom Layer 13 20158328 www.national.com ...

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... Date Description 8/18/05 Input corrected data under the Typical and Limit columns on all the 4 EC tables (per Kevin H.). 8/22/05 Changed limits back on LM4702A/B/C to ± 85V/80V/75V respectively (under Key 8/31/05 First WEB released of the datasheet. 9/2/05 Due to miscommunication with the ASSY plant (EM), the datasheet needs to be ...

Page 15

Physical Dimensions inches (millimeters) unless otherwise noted 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 ...

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