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SL34119 Fiches technique(PDF) 3 Page - System Logic Semiconductor

No de pièce SL34119
Description  Low Power Audio Amplifier
Download  6 Pages
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Fabricant  SLS [System Logic Semiconductor]
Site Internet  http://www.slsemicon.co.kr/e_index.htm
Logo SLS - System Logic Semiconductor

SL34119 Fiches technique(HTML) 3 Page - System Logic Semiconductor

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SL34119
System Logic
Semiconductor
SLS
line powered speakerphone, for example, will require
more filtering than a circuit powered by a well
requlated power supply. The amount of rejection is a
function of the capacitors, and the equivalent
impedance looking into FC1 and FC2 (listed in the
Electrical Characteristics as RFC1 and RFC2).
In addition to providing filtering, C1 and C2 also
affect the turn-on time of the circuit at power-up,
since the two capacitors must change up through the
internal 50 K
Ω and 125 KΩ resistors.
CHIP DISABLE
The Chip Disable (Pin 1) can be used to power
down the IC to conserve power, or for muting, or both.
When at a Logic “0” (0 to 0.8 Volts), the IL34119 is
enabled for normal operation. When Pin 1 is at a
Logic “1” (2.0 to VCC Volts), the IC is disabled. If Pin 1
is open, that is equivalent to a Logic “0”, although
good design practice dictates that an input should
never be left open. Input impedance at Pin 1 is a
nominal 90 K
Ω. The power supply current (when
disabled) is shown in Figure 1.
Muting, defined as the change in differential gain
from normal operation to muted operation, is in excess
of 70 dB. The turn-off time of the audio output, from
the application of the CD signal, is <2.0
µs, and turn
on-time is 12-15 ms. Both times are independent of C1,
C2, and VCC.
When the SL34119 is disabled, the voltages at
FC1 and FC2 do not change as they are powered from
VCC. The outputs, VO1 and VO2, change to a high
impedance condition, removing the signal from the
speaker. If signals from other sources are to be
applied to the outputs (while disabled), they must be
within the range of VCC and Ground.
POWER DISSIPATION
Figures 2-4 indicate the device dissipation (within
the IC) for various combinations of VCC, RL,
and load power.The maximum power which can safely
be dissipated within the SL34119 is found from the
following equation:
PD = (140
°C - T
A)/
θ
JA
where TA is the operating temperature;
and
θ
JA is the package thermal resistance (100
°C/W
for the standard DIP package, and 180
°C/W for the
surface mount package).
The power dissipated within the SL34119, in a
given application, is found from the following
eguation:
PD = (VCC x ICC) + (IRMS x VCC) - (RL x IRMS
2).
where ICC is obtained from Figure 1;
and IRMS is the RMS current at the load;
and RL is the load resistance.
Figures 2-4, along with Figures 5-7 (distortion
curves), and a peak working load current of
±200 mA,
define the operating range for the IL34119. The
operating range is further defined in terms of
allowable load power in Figure 8 for load of 8.0
Ω,
16
Ω, and 32 Ω. The left (ascending) portion of each
of the three curves is defined by the power level at
which 10% distortion occurs. The center flat portion
of each curve is defined by the maximum output
current
capability
of
the
SL34119.
The
right
(descending) portion of each curve is defined by the
maximum internal power dissipation of the IC at 25
°C.
At higher operating be reduced according to the
above equations. Operating the device beyond the
current and junction temperature limits will degrade
long term reliability.
LAYOUT CONSIDERATIONS
Normally a snubber is not needed at the output of
the SL34119, unlike many other audio amplifiers.
However, the PC board layout, stray capacitances,
and the manner in which the speaker wires are
configured, may dictate otherwise. Generally the
speaker wires should be twisted tightly, and be not
more than a few inches in length.
MAXIMUM RATINGS
*
Symbol
Parameter
Value
Unit
VCC
Supply Voltage
1.0 to +18
V
IOUT
Maximum Output Current at VO1, VO2
±250
mA
VIN
MaximumInput Voltage(FC1, FC2, CD, VIN)
-1.0 toVCC +1.0
V
VVO
Applied Output Voltage to VO1, VO2 when disabled
-1.0 toVCC +1.0
V
Tstg
Storage Temperature Range
-65 to +150
°C
* Maximum Ratings are those values beyond which damage to the device may occur.
Functional operation should be restricted to the Recommended Operating Conditions.


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