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PDF LA4708N Data sheet ( Hoja de datos )
| Número de pieza | LA4708N | |
| Descripción | 20W 2-channel BTL AF Power Amplifier | |
| Fabricantes | ON Semiconductor | |
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Ordering number : ENA1783A
LA4708N
Monolithic Linear IC
20W 2-channel BTL AF Power
Amplifier for Car Stereo
http://onsemi.com
Overview
The LA4708N is a BTL two-channel power IC for car audio developed in pursuit of excellent sound quality. Low-region
frequency characteristics have been improved through the use of a new NF capacitor-less circuit, and crosstalk which
causes “muddy” sound has been reduced by improving both circuit and pattern layout. As a result, the LA4708N provides
powerful bass and clear treble. In addition, the LA4708N features on-chip protectors and standby switch.
Features
High power : supports total output of 30W 30W (VCC = 13.2V, THD = 30%, RL = 4)
Supports RL = 2 (PO = 30W when VCC = 13.2V, THD = 10%)
Designed for excellent sound quality (fL 10Hz, fH = 130kHz)
NF capacitor-less
Any on time settable by external capacitor
Less pop noise
Standby switch circuit on chip (microprocessor supported)
Various protectors on chip (output-to-ground short/output-to-VCC short/load short/overvoltage/thermal shutdown circuit)
Specifications
Maximum Ratings at Ta = 25C
Parameter
Symbol
Conditions
Maximum supply voltage
VCC max 1 No signal, t = 60s
VCC max 2
Surge supply voltage
Maximum output current
Allowable power dissipation
VCC surge
IO peak
Pd max
t 0.2s, single giant pulse
Per channel
Arbitrarily large heat sink
Operating temperature
Topr
Storage temperature
Tstg
* Set VCC, RL in a range that does not exceed Pd max = 37.5W
Ratings
24
16
50
4.5
37.5
35 to 85
40 to 150
Unit
V
V
V
A
W
C
C
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed,
damage may occur and reliability may be affected.
ORDERING INFORMATION
See detailed ordering and shipping information on page 9 of this data sheet.
Semiconductor Components Industries, LLC, 2014
March, 2014
SIP18H
30314HK/61610SY 20100405-S0010 No.A1783-1/9
1 page  
LA4708N
Features of IC Inside and Usage Notes
Standby function
Pin 5 is the standby switch pin. The amplifier is
turned on by applying approximately 2.5V or more
to this pin through an external resistor (R1).
If voltage in excess of 13.2V is to be applied to the
standby switch, calculate the value of R1 using the
following formula so that the current flowing into
pin 5 is 500A or less:
R1 = Applied voltage 1.4V 10k
500A
Mute function
Pin 6 is the connector for the capacitor that determines the on time in order to prevent pop noise. By grounding this
pin, the amplifier can implement mute operation. In this case, the recovery time depends on C3.
How to reduce pop noise
Although the LA4708N reduces pop noise, an electrolytic capacitor of between 0.47 and 2.2F can be connected
between pin 8 and the pre-GND to further reduce pop noise that occurs when power supply is turned on/off
(standby switch on/off). The larger the capacitance, the lower the frequency of pop noise, and it is barely audible,
but sound residue of the sound signal is liable to linger when power is turned off. Pin 8 is the bias pin for the output
amplifier and normally is left open.
Protectors
In an output-to-ground and output-to-VCC short protector system configuration, if a DC resistor is connected
between amplifier output pin and GND, the protector may operate, causing the amplifier not to start operating.
Therefore, as a general rule, no DC resistor should be connected between amplifier output pin and GND.
In order to prevent damage or degradation which may be caused by abnormally heated IC, the LA4708N has a thermal
shutdown protector. Accordingly, if the IC junction temperature (Tj) climbs to around 170 to 180C due to inadequate
heat dissipation, the thermal shutdown protector will operate to control the output gradually into attenuation.
Also be fully careful of handling other protectors built in the LA4708N.
Miscellaneous
Since pins 1 and 9, which are unused, are connected internally, they must be left open.
Pin 10 is an NC pin (no internal connection).
No. A1783-5/9
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet LA4708N.PDF ] | |
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