LA4708N

Ordering number : ENA1783 Monolithic Linear IC LA4708N Overview For Car Stereos 20W 2-channel BTL AF Power Amplifier The LA4708N 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 capacitor-less circuit, and crosstalk which causes “muddy” sound has been reduced by improving both circuit and pattern layout. As a result, the LA4708N provides powerful bass and clear treble. In addition, the LA4708N features on-chip protectors and standby switch. Features • High power : supports total output of 30W + 30W (VCC = 13.2V, THD = 30%, RL = 4Ω) • Supports RL = 2Ω (PO = 30W when VCC = 13.2V, THD = 10%) • Designed for excellent sound quality (fL < 10Hz, fH = 130kHz) • NF capacitor-less • 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) Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to "standard application", intended for the use as general electronics equipment (home appliances, AV equipment, communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee thereof. If you should intend to use our products for applications outside the standard applications of our customer who is considering such use and/or outside the scope of our intended standard applications, please consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our customer shall be solely responsible for the use. Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer' s products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer' s products or equipment. 61610 SY 20100405-S0010 No.A1783-1/9 LA4708N Specifications Maximum Ratings at Ta = 25°C Parameter Maximum supply voltage Symbol VCC max 1 VCC max 2 Surge supply voltage Maximum output current Allowable power dissipation Operating temperature Storage temperature VCC surge IO peak Pd max Topr Tstg t ≤ 0.2s, single giant pulse Per channel Arbitrarily large heat sink Conditions No signal, t = 60s 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 = 37.5W 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 Range where Pd max is not exceeded Conditions Ratings 13.2 9 to 16 4 2 to 4 Unit V V Ω Ω Electrical Characteristics at Ta = 25°C, VCC = 13.2V, RL = 4Ω, f = 1kHz, Rg = 600Ω Parameter Quiescent current Standby current Voltage gain Total harmonic distortion Output power Symbol ICCO lst VG THD PO1 PO2 PO3 Output offset voltage Output noise voltage Ripple rejection ratio Channel separation Input resistance Standby pin applied voltaga VN offset VNO SVRR CHsep ri Vst Amp on, applied through 10kΩ PO = 2W THD = 10% THD = 10%, VCC = 14.4V THD = 10%, RL = 2Ω Rg = 0 Rg = 0, B.P.F. = 20Hz to 20kHz Rg = 0, fR = 100Hz, VR = 0dBm Rg = 10kΩ, VO = 0dBm 40 50 21 2.5 −300 0.1 50 60 30 39 VCC 16 38 Conditions min 70 typ 150 10 40 0.07 20 24 30 +300 0.5 max 250 60 42 0.4 Unit mA μA dB % W W W mV mVrms dB dB kΩ V Package Dimensions unit : mm (typ) 3109A 36.8 (R1.7) (30.0) HEAT SPREADER 4.5 8.0 (11.0) 0.8 min 1 (1.4) 2.0 0.5 1.0 18 6.0 15.0 max (13.8) 0.4 2.25 SANYO : SIP18H No. A1783-2/9 LA4708N 40 Pd max -- Ta Arbitrarily large heat sink 3 θf -- Sf AI heat sink, t = 1.5mm Tightening torque 39N cm With silicone grease applied Allowable power dissipation, Pd max -- W 35 30 25 Heat sink thermal resistance, θf -- °C/ W 160 θf = 1.5°C/W 2.0°C/W 3.2°C/W 2 θjc = 2.0°C/W 10 7 5 20 15 4.1°C/W 7.0°C/W 10 5 3.5 0 -20 No Fin 0 20 40 60 80 100 120 140 3 Ambient temperature, Ta -- °C 2 2 3 5 7 JK470801 Heat sink area, Sf -- cm2 100 2 3 5 7 1000 JK470802 Block Diagram 100μF/ 16V + C2 3 RIPPLE FILTER PREDRIVER C1 IN1 + 2.2μF/ 6.3V POWER 1 VCC VCC1 18 OUTPUT PIN-TO-VCC SHORT PROTECTOR C5 + 2200μF 2 + IN PREDRIVER POWER LOAD SHORT PROTECTOR INVERTING OUT1 17 0.1μF ∗∗ C6 R2 2.2Ω 16 POWER R3 2.2Ω GND1 0.1μF + ∗∗ C7 15 NONINVERTING OUT1 ∗∗ POLYESTER FILM CAPACITOR RL 2 to 4Ω PRE GND 4 BIAS CIRCUIT STANDBY SW OVERVOLTAGE/ SURGE PROTECTOR THERMAL SHUTDOWN VCC OUTPUT PIN-TO-GND SHORT PROTECTOR OUTPUT PIN-TO-GND SHORT PROTECTOR OFF ON +5V R1 10kΩ 5 C4 IN2 + 2.2μF/ 6.3V PREDRIVER 7 + IN - POWER LOAD SHORT PROTECTOR 14 NONINVERTING OUT2 ∗∗ 0.1μF C8 2.2Ω 2.2Ω 0.1μF C9 + - POWER 13 GND2 R4 R5 ∗∗ RL 2 to 4Ω PREDRIVER POP NOISE PREVENTION CIRCUIT 6 33μF/ 6.3V + C3 8 9 POWER OUTPUT PIN-TO-VCC SHORT PROTECTOR 10 N.C 11 12 INVERTING OUT2 VCC2 Pins 1,9 : Don't use. Pin 10 : No connection. Each Pin Voltage VCC = 13.2V, 5V applied through STBY = 10kΩ, RL = 4Ω, 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. A1783-3/9 LA4708N Sample Print Pattern VCC 1 + C5 + + C1 IN1 C2 R1 STB + C3 PRE GND C6 OUT1 R2 GND C7 R3 OUT2 R4 C8 GND IN2 C +4 Copper foil area 90 × 105mm2 R5 C9 Description of External Components C1, C4 C2 C3 C5 C6, C7, C8, C9 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., 0.1μF or more is recommended. 10kΩ is recommended (when the applied voltage for the standby switch is 2.5V to 13.2V). This resistor cannot be removed. Approximately 0.8 second for 33μF. Since the on time is proportional to this capacitance, it can be set as desired by varying this capacitance. (Refer to the characteristics curve.) 2.2μF is recommended. fL can be varied by C1, C4 capacitances to adjust the bass range. R1 Standby switch current limiting resistor No. A1783-4/9 LA4708N Features of IC Inside and Usage Notes Standby function • Pin 5 is the standby switch pin. The amplifier is turned on by applying approximately 2.5V or more to this pin through an external resistor (R1). • If voltage in excess of 13.2V is to be applied to the standby switch, calculate the value of R1 using the following formula so that the current flowing into pin 5 is 500μA or less: R1 = Applied voltage − 1.4V 500μA − 10kΩ 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 LA4708N reduces pop noise, an electrolytic capacitor of between 0.47 and 2.2μF 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-VCC 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 LA4708N has a thermal shutdown protector. Accordingly, if the IC junction temperature (Tj) climbs to around 170 to 180°C 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 LA4708N. 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. A1783-5/9 LA4708N 200 ICCO -- VCC RL = Open Rg = 0 VST = 5V 5 3 2 Quiescent current, ICCO -- mA 180 160 140 120 100 80 60 40 20 0 0 4 8 12 16 20 Output power, PO -- W 10 7 5 3 2 1.0 7 5 3 2 0.1 7 5 3 RL = 4Ω f = 1kHz Rg = 600Ω VG = 40dB Dual channel drive PO -- VIN V CC =1 4.4 V = 13. 2V VCC 24 28 5 7 Supply voltage, VCC -- V 48 44 40 10 2 3 5 7 100 2 3 5 JK470806 Input level, VIN -- mVrms 60 JK470807 PO -- VCC f = 1kHz Rg = 600Ω THD = 10% Dual channel drive PO -- VCC f = 1kHz Rg = 600Ω THD = 30% Dual channel drive dm ax 50 Output power, PO -- W gP 36 32 28 24 20 16 12 8 4 6 8 10 12 Output power, PO -- W ee din Ex c R L= 2Ω 8 10 40 30 = RL 2Ω = RL 4Ω RL =4 Ω 20 10 14 16 18 20 0 6 12 14 16 18 20 Supply voltage, VCC -- V 5 JK470808 Supply voltage, VCC -- V 3 JK470809 THD -- PO Total harmoinc distortion, THD -- % VCC = 13.2V RL = 4Ω Rg = 600Ω Dual channel drive THD -- PO VCC = 13.2V RL = 2Ω Rg = 600Ω Dual channel drive Total harmoinc distortion, THD -- % 3 2 10 7 5 3 2 1.0 7 5 3 2 0.1 7 5 2 10 7 5 3 2 1.0 7 5 3 2 0.1 f = 10kH z f = 10k Hz z 100Hz 100H 1kHz 2 3 5 7 1.0 2 3 5 7 10 2 3 5 3 0.1 Output power, PO -- W 5 7 5 0.1 1kH 23 5 7 1.0 2 z 3 5 7 10 2 3 5 7 JK470811 JK470810 Output power, PO -- W THD -- f VCC = 13.2V RL = 4Ω Rg = 600Ω PO = 2W 4 f Response VCC = 13.2V RL = 4Ω Rg = 600Ω VO = 0dBm at f = 1kHz Total harmoinc distortion, THD -- % 3 2 2 1.0 7 5 3 2 0 Response -- dB 23 5 7 100 23 5 7 1k 23 5 7 10k 23 5 7100k -2 -4 -6 0.1 7 5 3 10 -10 10 23 5 7 100 23 5 7 1k 23 5 7 10k 23 5 7100k JK470813 -8 Input frequency, f -- Hz JK470812 Input frequency, f -- Hz No. A1783-6/9 LA4708N 24 PO -- f Channel separation, CHSep -- dB 20 CH Sep -- f VCC = 13.2V RL = 4Ω Rg = 10kΩ VO = 0dBm 22 0 Output power, PO -- W THD = 10% 20 -20 18 3% 16 -40 1% VCC = 13.2V RL = 4Ω Rg = 600Ω VG = 40dB Dual channel drive 23 5 7 100 23 5 7 1k 23 5 710k 23 57 -60 CH1 CH2 14 1 CH2 CH -80 12 10 10 -100 10 23 5 7 100 23 5 7 1k 23 5 7 10k 23 5 7 100k Input frequency, f -- Hz 1.0 JK470814 0 Input frequency, f -- Hz JK470815 VNO -- Rg Ripple rejection ratio, SVRR -- dB SVRR -- VCC Output noise voltage, VNO -- mVrms 7 5 3 2 VCC = 13.2V RL = 4Ω DIN AUDIO -20 RL = 4Ω Rg = 0 fR = 100Hz VCCR = 0dBm -40 OUT1 -60 0.1 7 5 3 2 2 OUT2 -80 3 5 7 1k Input resistance, Rg -- Ω 2 3 5 7 10k 2 3 5 7 100k 2 -100 4 2200μF (power supply capacitor) is changed to 0.47μF (Mylar) 6 8 10 12 14 16 18 20 JK470816 Supply voltage, VCC -- V 0 JK470817 20 SVRR -- fR Ripple rejection ratio, SVRR -- dB SVRR -- VCCR VCC = 13.2V RL = 4Ω fR = 100Hz/3kHz Ripple rejection ratio, SVRR -- dB 0 VCC = 13.2V RL = 4Ω Rg = 0 VCCR = 0dBm -20 -20 -40 -40 fR = 100Hz OUT1 OUT1 fR = 3kHz OUT2 OU -60 T2 -60 1 OUT OUT2 -80 -80 -100 10 The value of power supply capacitor is 0.47μF (Mylar) 23 5 7 100 23 5 7 1k 23 5 7 10k 23 5 7100k -100 0 The value of power supply capacitor is 0.47μF (Mylar) VO Calculate as SVRR = 20 log VCCR 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 Ripple frequency, fR -- Hz 2 JK470818 2 2 Power supply ripple voltage, VCCR -- Vrms RL = 2Ω Rg = 600Ω f = 1kHz Dual channel drive JK470819 2 100 Power dissipation, Pd -- W 5 3 2 I CC (V C C 5 3 2 5 3 2 Pd max = 37.5W ) 6V 5 3 10 7 5 3 2 7 0.1 2 Pd (V C C 6V =1 ) Pd ( V CC = 13.2 1.0 10 7 5 3 2 2 3 5 7 0.1 Pd (V CC =1 Pd (VCC = 13.2V) 2 1.0 7 5 3 V) 7 5 3 3 5 7 1.0 2 3 5 7 10 2 3 5 2 7 23 5 7 1.0 2 3 5 7 10 2 3 2 57 Output power, PO -- W JK470820 Output power, PO -- W JK470821 No. A1783-7/9 Current drain, ICC -- A = Current drain, ICC -- A Power dissipation, Pd -- W 7 RL = 4Ω Rg = 600Ω f = 1kHz Dual channel drive Pd, ICC -- PO Pd, ICC -- PO =1 I CC CC (V 6V ) 10 V 16 ) 100 7 10 7 7 Allowable power dissipation package LA4708N 12 VN -- VCC RL = Open Rg = 0 200 180 ICCO -- Ta VCC = 13.2V RL = Open Rg = 0 Quiescent current, ICCO -- mA 4 8 12 16 20 24 28 10 Output pin voltage, VN -- V 160 140 120 100 80 60 40 20 8 6 4 2 0 0 0 -40 -20 Supply voltage, VCC -- V 36 34 32 JK470822 5 Ambient temperature, Ta -- °C 0 20 40 60 80 100 JK470823 PO -- Ta Total harmonic distortion, THD -- % THD -- Ta VCC = 13.2V RL = 4Ω Rg = 600Ω f = 1kHz PO = 2W Dual channel drive 3 2 Output power, PO -- W RL = 2 Ω VCC = 13.2V Rg = 600Ω f = 1kHz THD = 10% Dual channel drive 30 28 26 24 22 20 18 16 -40 -20 0 20 40 60 80 100 0.1 7 5 RL = 4Ω 3 2 -40 Ambient temperature, Ta -- °C -20 JK470824 1.2 Ambient temperature, Ta -- °C 0 20 40 60 80 100 JK470825 8 7 VN -- VST Amp ON time -- C3 1.0 Output pin voltage, VN -- V 6 Amp ON time -- s 0.8 5 4 3 2 1 0 0 0.6 VCC = 13.2V RL = 4Ω Rg = 0 Apply VST to standby pin (pin 5) through 10kΩ. 1 2 3 4 5 6 7 8 0.4 0.2 0 2 VCC = 13.2V VST = 5V (Apply to pin 5 through 10kΩ.) 3 5 7 10 Standby pin applied voltage, VST -- V JK470826 C3 -- μF 2 3 5 7 100 2 JK470827 PS No. A1783-8/9 LA4708N SANYO Semiconductor Co.,Ltd. assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein. SANYO Semiconductor Co.,Ltd. strives to supply high-quality high-reliability products, however, any and all semiconductor products fail or malfunction with some probability. It is possible that these probabilistic failures or malfunction could give rise to accidents or events that could endanger human lives, trouble that could give rise to smoke or fire, or accidents that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. In the event that any or all SANYO Semiconductor Co.,Ltd. products described or contained herein are controlled under any of applicable local export control laws and regulations, such products may require the export license from the authorities concerned in accordance with the above law. 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SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's intellctual property rights which has resulted from the use of the technical information and products mentioned above. This catalog provides information as of June 2010. Specifications and information herein are subject to change without notice. PS PS No. A1783-9/9