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LA47510 데이터시트 PDF




Sanyo Electric에서 제조한 전자 부품 LA47510은 전자 산업 및 응용 분야에서
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부품번호 LA47510 기능
기능 BTL Power IC
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LA47510 데이터시트, 핀배열, 회로
www.DataSheet4U.com
Ordering number: ENN8306A
LA47510
Monolithic Linear IC
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=4)
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)
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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.
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Specifications
Maximum Ratings at Ta=25°C
Parameter
Maximum supply voltage
Maximum output current
Maximum power dissipation
Operating ambient temperature
Storage ambient temperature
Junction-to-case thermal resistance
Symbol
VCC max1
VCC max2
IO peak
Pd max
Topg
Tstg
θj-c
Test Conditions
No signal, t=1 minute
With signal
Per channel
With infinite heat sink (note)
Ratings
26
18
4.5
50
-40 to +85
-40 to +150
1
unit
V
V
A
W
°C
°C
°C/W
DataSheet4U.com
DataSheet4 U .com
60905 KK JK No.8306-1/8




LA47510 pdf, 반도체, 판매, 대치품
www.DataSheet4U.com
Description of Operation
LA47510
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 k.
The mute time constant is determined by the external capacitor and resistor constants. The recommended external
constants are C = 3.3 µF, R = 10 k.
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.
et4U.com
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 anDd a2t.2aShieneste4rUie.sc)obmetween 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.
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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 kresistor. 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
DataSheet4U.cinovmestigation of anti-oscillation measures should be made in the set condition before use.
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No.8306-4/8

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LA47510
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