LA4705N [ETC]
15W 2-CHANNEL BTL AF POWER AMPLIFIER FOR CAR STEREOS(258.00 k) ; 15W双声道BTL AF功率放大器汽车音响（ 258.00 K）\n
| 型号： | LA4705N |
| 厂家： | 
ETC |
| 描述： | 15W 2-CHANNEL BTL AF POWER AMPLIFIER FOR CAR STEREOS(258.00 k)
|
| 文件： | 总8页 (文件大小：257K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Ordering number: EN3848D
Monolithic Linear IC
LA4705
15 W 2-channel BTL AF Power Amplifier
for Car Stereos
Overview
Package Dimensions
unit: mm
The LA4705 is a BTL two-channel power IC for car audio and
radio-cassette players developed in pursuit of excellent sound
3109-SIP18H
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
LA4705 provides powerful bass and clear treble. In addition,
the LA4705 features on-chip protectors and standby switch.
[LA4705]
Features
.
High power: supports total output of 25 W + 25 W
(VCC = 14.4 V, THD = 30%, RL = 4 Ω)
Less pop noise
Designed for excellent sound quality
(fL < 10 Hz, fH = 130 kHz)
Any on time settable by external capacitor
Standby switch circuit on chip (microprocessor supported)
Various protectors on chip
.
.
SANYO : SIP18H
.
.
.
(output-to-ground short/output-to-VCC short/
load short/overvoltage/thermal shutdown circuit)
NF capacitorless
.
.
Supports RL = 2 Ω
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
V
V
max 1
No signal, t = 60 s
24
18
50
V
V
CC
max 2
surge
With signal
CC
Surge supply voltage
Allowable power dissipation
Operating temperature
Storage temperature
V
t % 0.2 s, single giant pulse
Arbitrarily large heat sink
V
CC
Pd max
Topr
37.5
W
°C
°C
–35 to +85
Tstg
–40 to +150
* Set VCC, RL in a range that does not exceed Pd max = 37.5 W
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
D3096HA(II)/12693TS/4152TS No.3848-1/8
LA4705
Operating Conditions at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
13.2
Unit
V
Recommended supply voltage
Operating voltage range
V
CC
op
V
Range where Pd max is not exceeded
9 to 18
4
V
CC
Recommended load resistance
R
Ω
L
Operating Characteristics at Ta = 25°C, VCC = 13.2 V, RL = 4 Ω, f = 1 kHz, Rg = 600 Ω
Parameter
Quiescent current
Symbol
Conditions
min
80
typ
115
10
max
Unit
mA
µA
dB
%
I
250
60
CCO
Ist
Standby current
Voltage gain
VG
38
11
40
42
Total harmonic distortion
THD
P 1
P
= 1 W
0.1
15
0.4
O
THD = 10%
W
O
Output power
P 2
THD = 10%, V
= 14.4 V
18
W
O
CC
P 3
THD = 10%, R = 2 Ω
16
W
O
L
Output offset voltage
Output noise voltage
Ripple rejection ratio
Channel separation
Input resistance
V
offset
Rg = 0
–300
+300
mV
N
V
Rg = 0, B.P.F. = 20 Hz to 20 kHz
0.1
50
60
30
0.5 mVrms
NO
SVRR
CHsep
Rg = 0, f = 100 Hz, V = 0 dBm
40
50
dB
dB
R
R
Rg = 10 kΩ, V = 0 dBm
O
r
21
39
kΩ
i
Standby pin applied voltage
Vst
Amp on, applied through 10 kΩ
2.5
V
V
CC
θf – Sf
Pd max – Ta
Al heat sink, t = 1.5 mm
Arbitrarily large heat sink
Tightening torque 39 Nccm
With silicone grease applied
Ambient temperature, Ta – °C
Heat sink area, Sf – cm2
No.3848 -2/8
LA4705
Features and Usage Notes
.
Pin 5 is the standby switch pin. The amplifier is turned on by applying approximately 2 V or more to this pin through an
external resistor (R1). The current flowing into pin 5 is 500 µA or less.
.
.
Pin 6 is the mute pin. The amplifier on time can be set as desired through C3. By grounding pin 6, the amplifier can implement
mute operation. In this case, the recovery time depends on C3.
In order to prevent damage or degradation which may be caused by abnormally heated IC, the LA4705 has a thermal shutdown
protector. Accordingly, in the case of 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 LA4705.
Sample Application Circuit
Unit (resistance: Ω, capacitance: F)
No.3848 -3/8
LA4705
Sam
Description of External Components
C1, C4
Input capacitors
2.2 µF is recommended. f can be varied by C1, C4 capacitances to adjust the
L
bass range.
C2
Decoupling capacitor
(ripple filter)
C3
Amplifier on time setting
capacitor
Approximately 0.6 to 0.7 second for 33 µF. Since the on time is proportional to
this capacitance, it can be set as desired by varying this capacitance. The
amplifier can implement mute operation by setting C3 to GND potential.
C5
Power supply capacitor
C6, C7, C8, C9 Oscillation blocking capacitors
Use polyester film capacitors (Mylar capacitors) with good temperature
characteristics. (R2, R3, R4, and R5 used jointly.) Since stability may be
affected slightly by the pattern layout, etc., 0.1 µF or more is recommended.
R1
Standby switch current limiting
resistor
10 kΩ is recommended. This resistor cannot be removed.
No.3848 -4/8
LA4705
PO – VIN
PO – VCC
Input level, VIN – Vrms
Supply voltage, VCC – V
PO – VCC
THD – PO
Supply voltage, VCC – V
Output power, PO – W
THD – PO
THD – PO
Output power, PO – W
Output power, PO – W
THD – f
f Response
0 dBm = VG 40 dB
Input frequency, f – Hz
Input frequency, f – Hz
No.3848 -5/8
LA4705
CH sep – f
PO – f
Input frequency, f – Hz
Input frequency, f – Hz
SVRR – VCC
SVRR – f
Ripple frequency, f – Hz
Supply voltage, VCC – V
SVRR – VCCR
V
– Rg
NO
Power supply ripple voltage, VCCR – Vrms
Input resistance, Rg – Ω
Pd, ICC – PO
Pd, ICC – PO
Package allowed power dissipation
Output power, PO – W
Output power, PO – W
No.3848 -6/8
LA4705
Pd, ICC – PO
ICCO – VCC
No load
Output power, PO – W
Supply voltage, VCC – V
ICCO – Ta
VN – VCC
No load
Supply voltage, VCC – V
Ambient temperature, Ta – °C
PO – Ta
THD – Ta
Ambient temperature, Ta – °C
Ambient temperature, Ta – °C
VN – VST
Amp ON time – C4
Unit (resistance: Ω)
Standby pin applied voltage, VST – V
No.3848 -7/8
C4 – µF
LA4705
AC Level
BTL output DC locus
Locus when ON
BTL output DC locus
AC Level
Locus when OFF
No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment,
nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or
indirectly cause injury, death or property loss.
Anyone purchasing any products described or contained herein for an above-mentioned use shall:
1 Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors
and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and
expenses associated with such use:
2 Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO
ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume
production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use
or any infringements of intellectual property rights or other rights of third parties.
This catalog provides information as of December, 1996. Specifications and information herein are subject to change without notice.
No.3848 -8/8
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