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Ordering number: EN3848D
Monolithic Linear IC
LA4705 15 W 2-channel BTL AF Power Amplifier for Car Stereos
Overview
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.
Package Dimensions
unit: mm
3109-SIP18H
[LA4705]
Features
. High power: supports total output of 25 W + 25 W = . (V pop14.4 V, THD = 30%, R = 4 ) Less . 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 H
SANYO : SIP18H
. .
(output-to-ground short/output-to-VCC short/ load short/overvoltage/thermal shutdown circuit) NF capacitorless Supports RL = 2
Specifications
Maximum Ratings at Ta = 25C
Parameter Maximum supply voltage Surge supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol VCC max 1 VCC max 2 VCC surge Pd max Topr Tstg With signal t % 0.2 s, single giant pulse Arbitrarily large heat sink Conditions No signal, t = 60 s Ratings 24 18 50 37.5 -35 to +85 -40 to +150 Unit V V V W C C
* 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 = 25C
Parameter Recommended supply voltage Operating voltage range Recommended load resistance Symbol VCC VCC op RL Range where Pd max is not exceeded Conditions Ratings 13.2 9 to 18 4 Unit V V
Operating Characteristics at Ta = 25C, VCC = 13.2 V, RL = 4 , f = 1 kHz, Rg = 600
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 min 80 38 PO = 1 W THD = 10% THD = 10%, VCC = 14.4 V THD = 10%, RL = 2 Rg = 0 Rg = 0, B.P.F. = 20 Hz to 20 kHz Rg = 0, fR = 100 Hz, VR = 0 dBm Rg = 10 k, VO = 0 dBm Amp on, applied through 10 k 11 typ 115 10 40 0.1 15 18 16 0.1 50 60 30 max 250 60 42 0.4 Unit mA A dB % W W W mV mVrms dB dB k V
-300 40 50 21 2.5
+300 0.5
39 VCC
Allowable power dissipation, Pd max - W
Heat sink thermal resistance, f - C/W
Pd max - Ta
Arbitrarily large heat sink
f - Sf
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.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 is 500 A or less. . external the mute(R1). The current flowing into pin 5set as desired through C3. By grounding pin 6, the amplifier can implement Pin 6 is pin. The amplifier on time can be C3. . mute operation. In this case,orthe recovery time dependsbeoncaused by abnormally heated IC, the LA4705 has a thermal shutdown In order to prevent damage degradation which may .
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: , capacitance: F)
No.3848 -3/8
LA4705
Sample Print Pattern
Copper foil area 90 x 105 mm2
Description of External Components
C1, C4 C2 C3 Input capacitors Decoupling capacitor (ripple filter) Amplifier on time setting capacitor Power supply capacitor 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 F or more is recommended. 10 k is recommended. This resistor cannot be removed. Approximately 0.6 to 0.7 second for 33 F. 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. 2.2 F is recommended. fL can be varied by C1, C4 capacitances to adjust the bass range.
C5 C6, C7, C8, C9
R1
Standby switch current limiting resistor
No.3848 -4/8
LA4705
PO - VIN PO - VCC
Output power, PO - W
Input level, VIN - Vrms PO - VCC Total harmonic distortion, THD - %
Output power, PO - W
Supply voltage, VCC - V THD - PO
Output power, PO - W
Supply voltage, VCC - V THD - PO Total harmonic distortion, THD - % Total harmonic distortion, THD - %
Output power, PO - W THD - PO
Output power, PO - W THD - f Total harmonic distortion, THD - %
Output power, PO - W f Response
0 dBm = VG 40 dB
Input frequency, f - Hz
Response - dB
Input frequency, f - Hz No.3848 -5/8
LA4705
CH sep - f Channel separation, CHsep - dB PO - f
Output power, PO - W
Input frequency, f - Hz SVRR - VCC Ripple rejection ratio, SVRR - dB Ripple rejection ratio, SVRR - dB
Input frequency, f - Hz SVRR - f
Supply voltage, VCC - V SVRR - VCCR Output noise voltage, VNO - mVrms Ripple rejection ratio, SVRR - dB
Ripple frequency, f - Hz VNO - Rg
Power supply ripple voltage, VCCR - Vrms Pd, ICC - PO Power dissipation, Pd - W Current drain, ICC - A Power dissipation, Pd - W
Input resistance, Rg - Pd, ICC - PO
Output power, PO - W
Output power, PO - W No.3848 -6/8
Current drain, ICC - A
Package allowed power dissipation
LA4705
Pd, ICC - PO
No load
ICCO - VCC Quiescent current, ICCO - mA
Power dissipation, Pd - W
Output power, PO - W VN - VCC
No load
Current drain, ICC - A
Supply voltage, VCC - V ICCO - Ta Quiescent current, ICCO - mA
Output pin voltage, VN - V
Supply voltage, VCC - V PO - Ta Total harmonic distortion, THD - %
Ambient temperature, Ta - C THD - Ta
Output power, PO - W
Ambient temperature, Ta - C Amp ON time - C4
Ambient temperature, Ta - C VN - VST Output pin voltage, VN - V
Amp ON time - s
Unit (resistance: )
C4 - F
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

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