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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 R =4 . (V = 13.2 V, 2THD(P= 30%, W when) = 13.2 V, Supports R = = 30 V THD = 10%) . Designed for excellent sound quality 10 Hz, f . (f CC L L O CC L H
SANYO : SIP18H
(output-to-ground short/output-to-VCC short/ load short/overvoltage/thermal shutdown circuit)
Specifications
Maximum Ratings at Ta = 25C
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 t % 0.2 s, single giant pulse Per channel Arbitrarily large heat sink Conditions No signal, t = 60 s Ratings 24 16 50 4.5 37.5 -35 to +85 -40 to +150 Unit V V V A 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
93096HA(II)/13096HA(II) No.5245-1/9
LA4708
Operating Conditions at Ta = 25C
Parameter Recommended supply voltage Operating voltage range Recommended load resistance Recommended load resistance range Symbol VCC VCC op RL RL op Range where Pd max is not exceeded Conditions Ratings 13.2 9 to 16 4 2 to 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 70 38 PO = 2 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 16 typ 150 10 40 0.07 20 24 30 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
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
LA4708
Equivalent Circuit Block Diagram
-
-
-
-
Pins 1,9 : Don't use Pin 10 : No connection
Each Pin Voltage
VCC = 13.2 V, 5 V applied through STBY = 10 k, RL = 4 , Rg = 0
Pin No. Name Pin voltage (V) Pin No. Name Pin voltage (V) Pin No. Name Pin voltage (V) 0.29 7 IN2 1.58 13 PWR-GND 2 0 1 2 IN1 1.58 8 POP 2.08 14 +OUT 2 6.5 3 DC 6.55 9 - 0.29 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
LA4708
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 (when the applied voltage for the standby switch is 2.5 V to 13.2 V). This resistor cannot be removed. Approximately 0.8 second for 33 F. Since the on time is proportional to this capacitance, it can be set as desired by varying this capacitance. (Refer to the characteristics curve.) 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.5245 -4/9
LA4708
Features of IC Inside and Usage Notes
Standby function
. Pin 5 is the standby switch pin. The amplifier is turned on by applying approximately 2.5 V or more to this pin through an . external resistor (R1). 13.2 V is to be applied to the standby switch, calculate the value of R1 using the following formula so If voltage in excess of
that the current flowing into pin 5 is 500 A or less: R1 = Applied voltage - 1.4 V 500 A - 10 k
500 A or less
Pin 5 Equivalent circuit internal IC
Standby About 1.4 V applied voltage (2V ) BE
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 LA4708 reduces pop noise, an electrolytic capacitor of between 0.47 and 2.2 F 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-V . .
CC 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 LA4708 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 LA4708.
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.5245 -5/9
LA4708
Quiescent current, ICCO -- mA
Output power, PO -- W
Dual channel drive
Supply voltage, VCC -- V
Input level, VIN -- mVrms
Output power, PO -- W
Output power, PO -- W
Dual channel drive
Exceeding Pd max
Dual channel drive
Supply voltage, VCC -- V Total harmonic distortion, THD -- % Total harmonic distortion, THD -- %
Supply voltage, VCC -- V
Dual channel drive
Dual channel drive
Output power, PO -- W
Output power, PO -- W
Total harmonic distortion, THD -- %
VO = 0 dBm at f = 1 kHz
Input frequency, f -- Hz
Response -- dB
Input frequency, f -- Hz No.5245 -6/9
LA4708
Dual channel drive
Channel separation, CHsep -- dB
Output power, PO -- W
Input frequency, f -- Hz Output noise voltage, VNO -- mVrms
Input frequency, f -- Hz
Ripple rejection ratio, SVRR -- dB Input resistance, Rg --
2200 F (power supply capacitor) is changed to 0.47 F (Mylar)
Supply voltage, VCC -- V
Ripple rejection ratio, SVRR -- dB
Ripple rejection ratio, SVRR -- dB
The value of power supply capacitor is 0.47 F(Mylar)
The value of power supply capacitor is 0.47 F (Mylar) Ripple frequency, fR -- Hz
Calculate as
Power supply ripple voltage, VCCR -- Vrms
Power dissipation, Pd -- W
Power dissipation, Pd -- W
Current drain, ICC -- A
Allowable power dissipation of package
Output power, PO -- W
Output power, PO -- W No.5245 -7/9
Current drain, ICC -- A
Dual channel drive
Dual channel drive
LA4708
Supply voltage, VCC -- V
Quiescent current, ICCO -- mA
Output pin voltage, VN -- V
Ambient temperature, Ta -- C
Total harmonic distortion, THD -- %
Output power, PO -- W
Dual channel drive
Dual channel drive
Ambient temperature, Ta -- C
Ambient temperature, Ta -- C
Output pin voltage, VN -- V
Apply VST to standby pin (pin 5) through 10 k.
Amp ON time -- s
(Apply to pin 5 through 10 k.)
Standby pin applied voltage, VST -- V
C3 -- F
No.5245 -8/9
LA4708
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 September, 1996. Specifications and information herein are subject to change without notice.
No.5245 -9/9

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