TDA7256
30W BRIDGE CAR RADIO AMPLIFIER
NO AUDIBLE POP DURING MUTE AND STANDBY OPERATIONS MUTING TTL COMPATIBLE
VERY LOW STANDBY CONSUMPTION PROGRAMMABLE TURN ON DELAY DIFFERENTIAL INPUT
SHORT CIRCUIT PROTECTIONS:
RL SHORT -OUT TO GROUND -OUT TO V S OTHER PROTECTIONS:-Load dump voltage surge -LoudspeakerDC current -Very inductive load -Overrating temperature -Open ground
DESCRIPTION
The TDA7256is a class AB fully protected bridge power amplifier,designed for car radio applica-tions.The high current capability allows to drive low impedance loads (up to 2Ω).The differential inputs availability makes it particularly suitable for boosters and active loudspeakers applications.
This is advanced information on a new product now in development or undergoing evaluation.Details are subject to change without notice.
regimeOctober 1998®
tombowBLOCK DIAGRAM
MULTIWATT11billie jean什么意思>stainless steel
ORDERING NUMBER:TDA7256
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TDA7256
PIN CONNECTION(Top view)
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Test Conditions Unit V S Operating Supply Voltage18V V S DC Supply Voltage28V V S Peak Supply Voltage(for50ms)40V
I o Output Peak Current(non repetiitive t=0.1ms)internally limited
I o Output Peak Current Repetitive f>10Hz 5.5A
P tot Power Dissipation(Tca=85°C)36W T stg,T J Storage and Junction Temperature Range-40to+150°C
THERMAL DATA
Symbol Description Value Unit R th j-ca Thermal Resistance Junction-ca Max 1.8°C/W
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ELECTRICAL CHARACTERISTICS(V S=14.4V,R L=4Ω,f=1KHz;T amb=25°C,unless otherwi specified)
Symbol Parameter Test Condition Min.Typ.Max.Unit V S Supply Voltage818V
gcpI q Quiescent Drain Current80150mA
R i Input Resistance50KΩCMR Common Mode Rejection f=1KHz,V in=100mV60dB V OS Output Off
t Voltage150mV P o Output Power d=10%
有志者事竟成英语R L=4ΩR L=3.2ΩR L=2Ω1822
26
30
W
W
W
d Distortion P o=0.1W to13W0.050.5%
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G V Voltage Gain(CL)36dB
e N Total Input Noi Voltage R g=10KΩ,B=22Hz to22KHz310µV
SVR Supply Voltage Rejection R g=10KΩ,V r=1Vrms,
f=300Hz
4560dB
Muting Attenuation V ref=1Vrms,
f=100Hz to10KHz
60dB Muting-in Threshold Voltage Pin1 2.4V
Muting-out Threshold Voltage Pin10.8V
Stand-by Attenuation Vref=1Vrms60dB
Stand-by Current Consumption100µA T SD Thermal Shut-down Junction
Temperature
145°C Figure1:Test and Application Circuit
TDA7256
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Figure 4:Output Power vs.Supply Voltagegetoff
Figure 3:Drain Current vs.Supply Voltage
Figure 2:P.C.and Layout of the fig.1(1:1scale)
TDA7256
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Figure 10:Distortion vs.Frequency
Figure 5:Output Power vs.Supply Voltage
Figure 6:Output Power vs.Supply Voltage
Figure 8:Distortion vs.Output Power
Figure 9:Distortion vs.Output Power
Figure 7:Distortion vs.Output Power TDA7256
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