Ordering number: ENN8306A Monolithic Linear IC LA47510 BTL (50W×4) Power IC for Car Stereo Systems Overview The LA47510 is a BTL 4-channel (50W×4) power IC for car stereo. The output stage uses a pure complementary format with a V-PNP transistor on the upper side and a NPN transistor on the lower side, making it possible to obtain high power output and excellent sound quality. This IC incorporates various functions (standby switch, mute function, full complement of protection circuits) needed for car audio, and also has a self-check (output offset detection) function. Functions & Features • 50W×4 maximum output (at VCC=14.4V, RL=4Ω) • Very low external component count • Onchip offset detector • Onchip offset detector shutoff switch • Mute function • Standby switch • Full compliment of protection circuits (including shorting to the power supply, shorting to ground, load short-circuit, overvoltage, thermal protection) Caution 1: Never make wrong connection. A wrong connection would cause fatal damage or performance degradation to the IC or equipment. Caution 2: The protective circuit functions are provided to temporarily avoid abnormal states such as incorrect output connections, and do not guarantee that IC destruction will not occur. These protective functions do not operate outside of the operation guarantee range. If the outputs are connected incorrectly, IC destruction may occur when used outside of the operation guarantee range. Specifications Maximum Ratings at Ta=25°C Parameter Symbol Test Conditions No signal, t=1 minute Ratings unit Maximum supply voltage VCC max1 26 VCC max2 With signal 18 V Maximum output current IO peak Per channel 4.5 A Maximum power dissipation Pd max With infinite heat sink (note) 50 W Operating ambient temperature Topg -40 to +85 °C Storage ambient temperature Tstg -40 to +150 °C Junction-to-case thermal resistance θj-c 1 V °C/W 60905 KK JK No.8306-1/8 LA47510 Note: Power consumption (Pd), junction-to-case thermal resistance (θj-c), heat sink thermal resistance (θf), junction temperature (Tj), case temperature (Tc) and ambient temperature (Ta) have the relationship shown in the following equation. Tj=Pd(θj-c + θf) + Ta =Pd×θj-c + Tc, *Tc=Pd×θf + Ta However, Tj max is limited by Tstg max (150°C) Recommended Operation Conditions at Ta=25°C Parameter Supply voltage Symbol Test Conditions Ratings unit VCC Load resistance RL Operating supply voltage range VCC op Pdmax shall not be exceeded. 14.4 V 4 Ω 9 to 18 V Electrical Characteristics at Ta=25°C, VCC=14.4V, f=1kHz, RL=4Ω, Rg=600Ω Parameter Quiescent current Symbol ICCO Test Conditions min RL=∞, Rg=0 max 200 Standby current Ist Vst=0V Output offset voltage Vn offset Rg=0 Voltage gain VG Vo=0dBm 25 Voltage gain difference ∆VG PO1 THD=10% 24 PO max1 PO max2 Output power typ -100 400 unit mA 10 µA +100 mV 27 dB +1 dB 26 -1 29 W VCC=13.7V, Vin=5Vrms 43 W Vin=5Vrms 48 W Total harmonic distortion THD Po=4W Channel separation CHsep Vo=0dBm, Rg=10kΩ 0.05 Ripple rejection ratio SVRR fr=100Hz, Vccr=0dBm, Rg=0 B.P.F=20Hz to 20kHz Output noise voltage VNO Rg=0, B.P.F=20Hz to 20kHz Mute attenuation Ma Vo=20dBm Output middle point voltage Vn Rg=0 0.3 % 55 65 dB 45 55 dB 150 70 250 µVrms 90 dB 2.65 V *0dBm=0.775Vrms Package Dimensions Unit: mm 3236 Maximum power dissipation Pdmax - W Pdmax -Ta 100 1) INFINITE HEAT SINK θj-c=1°C/w 2) HEAT SINK (θf=3.5°C/w) θj-c+θf=4.5°C/w 3) NO HEAT SINK θj-a=39°C/w 90 80 70 60 50 1) 40 30 2) 20 10 3) 0 -40 -20 0 20 40 60 80 100 120 140 160 180 200 Ambient temperature Ta - °C No.8306-2/8 LA47510 Block and Test Circuit Diagram Note: The components and constant values within the test circuit are used to confirm the characteristics, and are not guarantees that incorrect operation or other trouble will not occur in applied equipment. No.8306-3/8 LA47510 Description of Operation 1. Standby switch function (pin 4) The Pin 4 threshold voltage is set to 2 VBE, and the amplifier turns on when Vst = 2.0 V or higher, and off when Vst = 0.7 V or lower. In addition, Pin 4 requires an operating current of 40 µA or more. Note: Do not ground the output with the Pin 4 voltage at approximately 1.4 V. In addition, do not give the Pin 4 voltage a time constant. 2. Mute function Mute mode is established and the audio can be muted by connecting Pin 22 to GND through 10 kΩ. The mute time constant is determined by the external capacitor and resistor constants. The recommended external constants are C = 3.3 µF, R = 10 kΩ. 3. Self-check function (loudspeaker burnout prevention) Pin 25 is used to check, during normal operation, for any abnormality in the offset level of the amplifier and generates a signal when an abnormal level is detected. Speaker burnout can be prevented by detecting this Pin 25 signal with a microcontroller or other device and controlling the standby power supply, etc. (Output offset errors are thought to be caused by the leak current of the input capacitor, etc.) In addition, the Pin 25 signal can be turned off by setting Pin 1 to the GND potential. 4. Oscillation stability Parasitic oscillation may be induced depending on the board layout. Countermeasures against oscillation can be taken by adding the following parts. Note that the following are only examples for reference, and that the optimum capacitance values must be confirmed in the mounted condition for each set. • Connect a Mylar capacitor (0.033 µF) between the BTL outputs. • Connect a capacitor and a resistor (0.1 µF and 2.2 Ω in series) between each output and GND. 5. Sound quality (low frequencies) The frequency response in the low frequency range can be improved by varying the capacitance value of the input capacitor. The recommended value is 2.22 µF or less. 6. Shock noise This IC incorporates a shock noise canceling circuit, and the shock noise canceling performance can be further improved by using together with the mute function. • When turning on the amplifier, turn the power supply and the mute function on at the same time. Then turn the mute function off after the output current potential has stabilized. • When turning off the amplifier, first turn the mute function off and then turn the power supply off. 7. Using the pin 25 function and the pin 1 off function (1) Offset detection function (Pin 25) Output offsets can be detected by directly monitoring the pin potential in the condition with 5 V applied through a 10 kΩ resistor. When an offset is detected, the Pin 25 potential falls from 5 V to 0 V. * The voltage level at pin 25 swings up and down in synchronization with the output signal when the LA47510 is in the normal operating state. (2) Offset detection function OFF switch (Pin 1) The offset detection function (Pin 25) can be turned off by connecting Pin 1 to GND. Leave Pin 1 open during normal operation. 8. Electric mirror noise suppression measures Electric mirror noise can be reduced by inserting a bypass capacitor between the output and GND. For reference, the standard value is approximately 470 pF and the maximum value is approximately 2200 pF. However, note that inserting a bypass capacitor will cause the oscillation stability to worsen, so thorough investigation of anti-oscillation measures should be made in the set condition before use. No.8306-4/8 LA47510 Characteristics Charts No.8306-5/8 LA47510 No.8306-6/8 LA47510 No.8306-7/8 LA47510 PS No.8306-8/8