LA4708 PDF даташит
Спецификация LA4708 изготовлена «Sanyo» и имеет функцию, называемую «20 W 2-channel BTL AF Power Amplifier for Car Stereos». |
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Детали детали
Номер произв | LA4708 |
Описание | 20 W 2-channel BTL AF Power Amplifier for Car Stereos |
Производители | Sanyo |
логотип |
9 Pages
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Ordering number: EN5245A
Monolithic Linear IC
LA4708
20 W 2-channel BTL AF Power Amplifier
for Car Stereos
Overview
The LA4708 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 capacitorless circuit, and crosstalk which causes
‘‘muddy’’ sound has been reduced by improving both circuit
and pattern layout. As a result, the LA4708 provides powerful
bass and clear treble. In addition, the LA4708 features on-chip
protectors and standby switch. The LA4708 is also
pin-compatible with the LA4705NA (car stereo-use 17 W
two-channel power IC), and can be substituted for the
LA4705NA for higher power. (When the board is shared, pins
1 and 9 must be left open.)
Package Dimensions
unit: mm
3109-SIP18H
[LA4708]
Features
. High power: supports total output of 30 W + 30 W
. (VCC = 13.2 V, THD = 30%, RL = 4 Ω)
Supports RL = 2 Ω (PO = 30 W when VCC = 13.2 V,
. THD = 10%)
Designed for excellent sound quality
(fL < 10 Hz, fH = 130 kHz)
. NF capacitorless
. 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 = 25°C
Parameter
Maximum supply voltage
Surge supply voltage
Maximum output current
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VCC max 1
VCC max 2
VCC surge
IO peak
Pd max
Topr
Tstg
Conditions
No signal, t = 60 s
t % 0.2 s, single giant pulse
Per channel
Arbitrarily large heat sink
* Set VCC, RL in a range that does not exceed Pd max = 37.5 W
SANYO : SIP18H
Ratings
24
16
50
4.5
37.5
–35 to +85
–40 to +150
Unit
V
V
V
A
W
°C
°C
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
93096HA(II)/13096HA(II) No.5245-1/9
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LA4708
Operating Conditions at Ta = 25°C
Parameter
Recommended supply voltage
Operating voltage range
Recommended load resistance
Recommended load resistance range
Symbol
VCC
VCC op
RL
RL op
Conditions
Range where Pd max is not exceeded
Ratings
13.2
9 to 16
4
2 to 4
Unit
V
V
Ω
Ω
Operating Characteristics at Ta = 25°C, VCC = 13.2 V, RL = 4 Ω, f = 1 kHz, Rg = 600 Ω
Parameter
Quiescent current
Standby current
Voltage gain
Total harmonic distortion
Output power
Output offset voltage
Output noise voltage
Ripple rejection ratio
Channel separation
Input resistance
Standby pin applied voltage
Symbol
ICCO
Ist
VG
THD
PO1
PO2
PO3
VN offset
VNO
SVRR
CHsep
ri
Vst
Conditions
PO = 2 W
THD = 10%
THD = 10%, VCC = 14.4 V
THD = 10%, RL = 2 Ω
Rg = 0
Rg = 0, B.P.F. = 20 Hz to 20 kHz
Rg = 0, fR = 100 Hz, VR = 0 dBm
Rg = 10 kΩ, VO = 0 dBm
Amp on, applied through 10 kΩ
min typ max Unit
70 150 250 mA
10 60 µA
38 40
42 dB
0.07 0.4 %
16 20
W
24 W
30 W
–300
+300 mV
0.1 0.5 mVrms
40 50
dB
50 60
dB
21 30
39 kΩ
2.5 VCC V
Arbitrarily large heat sink
Al heat sink, t = 1.5 mm
Tightening torque 39 Nccm
With silicone grease applied
Ambient temperature, Ta — °C
Heat sink area, Sf — cm2
No.5245 -2/9
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Equivalent Circuit Block Diagram
LA4708
--
--
Pins 1,9 : Don’t use
Pin 10 : No connection
Each Pin Voltage
VCC = 13.2 V, 5 V applied through STBY = 10 kΩ, RL = 4 Ω, Rg = 0
Pin No.
1
2
3
Name
IN1 DC
Pin voltage (V)
0.29
1.58
6.55
Pin No.
Name
Pin voltage (V)
7
IN2
1.58
8
POP
2.08
9
–
0.29
Pin No.
Name
Pin voltage (V)
13
PWR–GND 2
0
14
+OUT 2
6.5
15
+OUT 1
6.5
4
Pre-GND
0
10
N.C
0
16
PWR–GND 1
0
5
STBY
3.2
11
VCC2
13.2
17
–OUT 1
6.5
6
ON TIME
2.28
12
–OUT 2
6.5
18
VCC1
13.2
No.5245 -3/9
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