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Details, datasheet, quote on part number:LM4668LD
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| Part: | LM4668LD |
| Category: | Multimedia => Audio => Amplifiers => Power Amplifiers |
| Description: | 10W High-efficiency Mono BTL Audio Power Amplifier |
| Company: | National Semiconductor Corporation |
| Datasheet: | Download LM4668LD datasheet File size : 482 kB |
| Request For quote: | Find where to buy LM4668LD
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Datasheet text preview:
LM4668 10W High-Efficiency Mono BTL Audio Power Amplifier
August 2004
LM4668 10W High-Efficiency Mono BTL Audio Power Amplifier
General Description
The LM4668 is a high efficiency switching audio power amplifier primarily designed for demanding applications in flat panel monitors and TV's. It is capable of delivering 6W to an 8 mono BTL load with less than 1% distortion (THD+N) from a 12VDC power supply. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4668 features a micro-power, active-low shutdown mode, an internal thermal shutdown protection mechanism, and short circuit protection. The LM4668 contains advanced transient ("pop and click") suppression circuitry that eliminates noises that would otherwise occur during turn-on and turn-off transitions.
Key Specifications
j Power Output BTL (VDD = 14V,
fIN = 1kHz, THD+N = 10%, RL = 8)
j Quiescent Power Supply Current j Efficiency (VDD = 12V, fIN = 1kHz,
10W (typ) 30mA (typ) 79% (typ) 0.15mA (typ) 30dB (typ)
RL = 8, POUT = 6W)
j Shutdown Current j Fixed Gain
Features
n Soft-start circuitry eliminates noise during turn-on transition n Low current shutdown mode n Low quiescent current n 6W BTL output, RL = 8 n Short circuit protection n Fixed, internally set gain of 30dB
Applications
n Flat Panel Monitors n Flat Panel TVs n Computer Sound Cards
Connection Diagrams
LD Package MH Package
20089102
Top View Order Number LM4668LD See NS Package Number LDC14A
200891G3
Top View Order Number LM4668MH See NS Package Number MXA20A
Boomer ® is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation
DS200891
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LM4668
Typical Application
20089101
FIGURE 1. Typical Audio Amplifier Application Circuit (* Zetex ZHCS506)
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LM4668
Absolute Maximum Ratings (Notes 1, 2)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Storage Temperature Input Voltage Power Dissipation (Note 3) ESD Susceptibility (Note 4) ESD Susceptibility (Note 5) 16V -65°C to +150°C -0.3V to VDD +0.3V Internally limited 2000V 200V
Junction Temperature (LD and MH) Thermal Resistance JC JA
150°C 2°C/W 40°C/W
Operating Ratings
Temperature Range TMIN TA TMAX Supply Voltage (Note 10) -40°C TA 85°C 9V VDD 14.0V
(Note 1) The following specifications apply for the circuit shown in Figure 1 operating with VDD = 12V, RL = 8, and fIN = 1kHz, unless otherwise specified. Limits apply for TA = 25°C. Symbol Parameter Conditions LM4668 Typical (Note 6) IDD ISD AV Quiescent Power Supply Current Shutdown Current Amplifier Gain VIN = 0V, IO = 0A, RL = 8 VSHUTDOWN = GND (Note 9) BTL output voltage with respect to input voltage, VIN = 100mVp-p THD+N = 1% (max) THD+N = 10%, VDD = 14V POUT = 6W, post filter, -3dB relative to the output amplitude at 1kHz, See Figure 1 POUT = 6W, including output filter A-Weighted Filter, VIN = 0V A-Weighted Filter, POUT = 6W AV = 30dB VRIPPLE = 20mVp-p, CBYPASS_1 = 10µF, input referred f = 50Hz f = 60Hz f = 100Hz f = 120Hz f = 1kHz CBYPASS = 10µF 30 0.15 30 6 10 0.2 20 20000 79 220 90 32 28 5 Limit (Notes 7, 8) 65 mA (max) mA dB (max) dB (min) W (min) W % Hz Hz % µV dB Units (Limits)
Electrical Characteristics for the LM4668
PO THD+N fBW
Output Power
Total Harmonic Distortion + Noise POUT = 1WRMS Frequency Response Bandwith
éN SNR PSRR
Efficiency Output Noise Signal-to-Noise Ratio Power Supply Rejection Ratio
79 82 85 84 75 600 170 4 1.5
dB
tWU TSD VSDIH VSDIL
Wake-Up time Thermal Shutdown Temperature Shutdown Voltage Input High Shutdown Voltage Input Low
ms °C (min) °C (max) V (min) V (max)
Note 1: All voltages are measured with respect to the GND pin 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 conditions 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 performance. Note 3: The maximum power dissipation must be de-rated at elevated temperatures and is dictated by TJMAX, JA, and the ambient temperature TA. The maximum allowable power dissipation is PDMAX = (TJMAX - TA)/JA or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4668 typical application (shown in Figure 1) with VDD = 12V, RL = 8 stereo operation, the total power dissipation is 900mW. JA = 40°C/W Note 4: Human body model, 100pF discharged through a 1.5k resistor. Note 5: Machine model, 220pF 240pF discharged through all pins. Note 6: Typicals are measured at 25°C and represent the parametric norm. Note 7: Limits are guaranteed to National's AOQL (Average Outgoing Quality Level).
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