ETC LA4705N

Ordering number: EN3848D
Monolithic Linear IC
LA4705
15 W 2-channel BTL AF Power Amplifier
for Car Stereos
Overview
Package Dimensions
The LA4705 is a BTL two-channel power IC for car audio and
radio-cassette players 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
LA4705 provides powerful bass and clear treble. In addition,
the LA4705 features on-chip protectors and standby switch.
unit: mm
3109-SIP18H
[LA4705]
Features
. High power: supports total output of 25 W + 25 W
= 14.4 V, THD = 30%, R = 4 Ω)
. (VLess pop
. Designed noise
for excellent sound quality
(f < 10 Hz, f = 130 kHz)
. Any on time settable by external capacitor
. Standby switch circuit on chip (microprocessor supported)
. Various protectors on chip
CC
L
.
.
L
SANYO : SIP18H
H
(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
Maximum supply voltage
Surge supply voltage
Allowable power dissipation
Symbol
VCC max 1
Conditions
Ratings
Unit
No signal, t = 60 s
24
V
VCC max 2
With signal
18
V
VCC surge
t % 0.2 s, single giant pulse
50
V
37.5
W
Pd max
Arbitrarily large heat sink
Operating temperature
Topr
–35 to +85
°C
Storage temperature
Tstg
–40 to +150
°C
* Set VCC, RL in a range that does not exceed Pd max = 37.5 W
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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
Recommended supply voltage
Operating voltage range
Conditions
Ratings
VCC
VCC op
Recommended load resistance
Range where Pd max is not exceeded
Unit
13.2
V
9 to 18
V
4
Ω
RL
Operating Characteristics at Ta = 25°C, VCC = 13.2 V, RL = 4 Ω, f = 1 kHz, Rg = 600 Ω
Output power
Allowable power dissipation, Pd max – W
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
min
80
38
PO = 1 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
11
Pd max – Ta
Arbitrarily large heat sink
Ambient temperature, Ta – °C
typ
115
10
40
0.1
15
18
16
–300
40
50
21
2.5
Amp on, applied through 10 kΩ
Heat sink thermal resistance, θf – °C/W
Parameter
Quiescent current
Standby current
Voltage gain
Total harmonic distortion
0.1
50
60
30
max
250
60
42
0.4
+300
0.5
39
VCC
Unit
mA
µA
dB
%
W
W
W
mV
mVrms
dB
dB
kΩ
V
θf – Sf
Al heat sink, t = 1.5 mm
Tightening torque 39 Nccm
With silicone grease applied
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
resistor (R1). The current flowing into pin 5 is 500 µA or less.
. external
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
operation. In this case, the recovery time depends on C3.
. mute
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
Sample Print Pattern
Copper foil area 90 × 105 mm2
Description of External Components
C1, C4
Input capacitors
2.2 µF is recommended. fL can be varied by C1, C4 capacitances to adjust the
bass range.
C2
Decoupling capacitor
(ripple filter)
C3
Amplifier on time setting
capacitor
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.
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.
No.3848 -4/8
LA4705
PO – VCC
Output power, PO – W
Output power, PO – W
PO – VIN
Supply voltage, VCC – V
THD – PO
Output power, PO – W
Total harmonic distortion, THD – %
Input level, VIN – Vrms
PO – VCC
Output power, PO – W
THD – PO
Total harmonic distortion, THD – %
Total harmonic distortion, THD – %
Supply voltage, VCC – V
THD – PO
Total harmonic distortion, THD – %
Output power, PO – W
THD – f
Output power, PO – W
f Response
Response – dB
0 dBm = VG 40 dB
Input frequency, f – Hz
Input frequency, f – Hz
No.3848 -5/8
LA4705
PO – f
Output power, PO – W
Channel separation, CHsep – dB
CH sep – f
Input frequency, f – Hz
SVRR – f
Ripple rejection ratio, SVRR – dB
Ripple rejection ratio, SVRR – dB
Input frequency, f – Hz
SVRR – VCC
Ripple frequency, f – Hz
VNO – Rg
Input resistance, Rg – Ω
Pd, ICC – PO
Current drain, ICC – A
Power dissipation, Pd – W
Power dissipation, Pd – W
Power supply ripple voltage, VCCR – Vrms
Pd, ICC – PO
Output power, PO – W
Package allowed power dissipation
Current drain, ICC – A
Ripple rejection ratio, SVRR – dB
Output noise voltage, VNO – mVrms
Supply voltage, VCC – V
SVRR – VCCR
Output power, PO – W
No.3848 -6/8
LA4705
Pd, ICC – PO
ICCO – VCC
Current drain, ICC – A
Quiescent current, ICCO – mA
Power dissipation, Pd – W
No load
Output power, PO – W
VN – VCC
Supply voltage, VCC – V
ICCO – Ta
Output pin voltage, VN – V
Quiescent current, ICCO – mA
No load
Ambient temperature, Ta – °C
THD – Ta
Output power, PO – W
Total harmonic distortion, THD – %
Supply voltage, VCC – V
PO – Ta
Ambient temperature, Ta – °C
VN – VST
Amp ON time – s
Output pin voltage, VN – V
Ambient temperature, Ta – °C
Amp ON time – C4
Unit (resistance: Ω)
C4 – µF
Standby pin applied voltage, VST – V
No.3848 -7/8
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