LM4734TA/NOPB National Semiconductor, LM4734TA/NOPB Datasheet
LM4734TA/NOPB
Specifications of LM4734TA/NOPB
Related parts for LM4734TA/NOPB
LM4734TA/NOPB Summary of contents
Page 1
... Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit SPiKe ™ Protection and Overture ™ are trademarks of National Semiconductor Corporation. © 2006 National Semiconductor Corporation Key Specifications j Output Power/Channel with 10% THD+N, 1kHz into 4Ω or 8Ω j THD+N at 3x1W into 8Ω ...
Page 2
Connection Diagrams www.national.com Plastic Package (Note 13) 200898I4 Top View Order Number LM4734TA See NS Package Number TA27A TO-220 Top Marking Top View U - Wafer Fab Code Z - Assembly Plant Code XY - Date Code TT - Die ...
Page 3
... Absolute Maximum Ratings 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications Supply Voltage | Common Mode Input Voltage Differential Input Voltage (Note 12) Output Current Power Dissipation (Note 3) ESD Susceptability (Note 4) ESD Susceptability (Note 5) ...
Page 4
Electrical Characteristics The following specifications apply for V 25˚C. Symbol Parameter Standby V Standby Low Input Voltage IL V Standby High Input Voltage IH Mute V Mute Low Input Voltage IL V Mute High Input Voltage IH Note 1: All ...
Page 5
Bridged Amplifier Application Circuit FIGURE 2. Bridged Amplifier Application Circuit 5 200898D3 www.national.com ...
Page 6
Parallel Amplifier Application Circuit www.national.com FIGURE 3. Parallel Amplifier Application Circuit 6 200898D4 ...
Page 7
Single Supply Application Circuit FIGURE 4. Single Supply Amplifier Application Circuit Note: *Optional components dependent upon specific design requirements. Auxiliary Amplifier Application Circuit FIGURE 5. Special Audio Amplifier Application Circuit 200898D5 200898D6 7 www.national.com ...
Page 8
External Components Description (Figures 1-5) Components 1 R Prevents current from entering the amplifier’s non-inverting input. This current may pass through to the load B during system power down, because of the amplifier’s low input impedance when the undervoltage circuitry ...
Page 9
Optional External Component Interaction Although the optional external components have specific desired functions that are designed to reduce the bandwidth and eliminate unwanted high frequency oscillations they may cause certain undesirable effects when they interact. Inter- action may occur for ...
Page 10
Typical Performance Characteristics THD+N vs Output Power/Channel ± 17V 4Ω, 80kHz BW L Output Power/Channel vs Supply Voltage f = 1kHz 4Ω, 80kHz BW L Total Power Dissipation vs Output Power/Channel 1% THD (max ...
Page 11
Typical Performance Characteristics Crosstalk vs Frequency ± 17V 10W, Channel 1 OUT R = 4Ω, 80kHz BW L Crosstalk vs Frequency ± 17V 10W, Channel 3 OUT R = 4Ω, 80kHz BW L Crosstalk vs Frequency ...
Page 12
Typical Performance Characteristics Crosstalk vs Frequency ± 21V 10W, Channel 3 OUT R = 8Ω, 80kHz BW L Mute Attenuation vs Mute Pin Voltage P = 10W/Channel OUT Common-Mode Rejection Ratio www.national.com (Continued) Two Channels On Crosstalk vs ...
Page 13
Typical Performance Characteristics THD+N vs Frequency ± 21V & 15W, Chs 1 & OUT Parallel Mode (Note 16 4Ω, 80kHz BW L THD+N vs Output Power ± 17V, Chs 1 & ...
Page 14
Typical Performance Characteristics Output Power vs Supply Voltage Chs 1 & Parallel Mode (Note 16 1kHz 4Ω, 80kHz BW L Note 15: Bridge mode graphs were taken using the demo board and inverting the ...
Page 15
Application Information 2π DMAX CC Thus by knowing the total supply voltage and rated output load, the maximum power dissipation point can be calcu- lated. The package dissipation is three times the number ...
Page 16
Application Information PARALLEL AMPLIFIER APPLICATION Parallel configuration is normally used when higher output current is needed for driving lower impedance loads (i.e. 4Ω or lower) to obtain higher output power levels. As shown in Figure 3 , the parallel amplifier ...
Page 17
Application Information CLICKS AND POPS In the typical application of the LM4734 as a split-supply audio power amplifier, the IC exhibits excellent “click” and “pop” performance when utilizing the mute and standby modes. In addition, the device employs Under-Voltage Pro- ...
Page 18
Application Information In comparing audio amplifiers it is necessary to measure the magnitude of noise in the audible bandwidth by using a “weighting” filter (Note 17). A “weighting” filter alters the frequency response in order to compensate for the average ...
Page 19
Application Information LAYOUT, GROUND LOOPS AND STABILITY The LM4734 is designed to be stable when operated at a closed-loop gain greater, but as with any other high-current amplifier, the LM4734 can be made to oscillate under certain ...
Page 20
Application Information If the DC blocking input capacitor (C IN lower -3dB point is found using Equation (8) as discussed in the Proper Selection of External Components section. www.national.com (Continued used as shown, the FIGURE 7. Inverting Amplifier ...
Page 21
Application Information (Continued) FIGURE 8. Reference PCB Schematic 21 200898D8 www.national.com ...
Page 22
Application Information LM4734 REFERENCE BOARD ARTWORK Composite Layer Top Layer www.national.com (Continued) 200898I7 200898I9 22 200898I8 Silk Layer 200898I6 Bottom Layer ...
Page 23
Application Information Bill Of Materials For Reference PCB Symbol Value 33kΩ IN1 IN2 IN3 1kΩ 20kΩ ...
Page 24
... BANNED SUBSTANCE COMPLIANCE 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. ...