orderin g numbe r : ena1783 monolithic linear ic for car stereos 20w 2-channel btl af power amplifier LA4708N overview 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 us e of a new nf capacitor-less ci rcuit, 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 (v cc = 13.2v, thd = 30%, r l = 4 ) ? supports r l = 2 (p o = 30w when v cc = 13.2v, thd = 10%) ? designed for excellent sound quality (f l < 10hz, f h = 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-v cc short/load short/overvoltage/thermal shutdown circuit) specifications of any and all sanyo semiconductor co.,l td. 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 ' sproductsor equipment. 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 equ ipment etc.). the products mentioned herein shall not be intended for use for any "special application" (medica l equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, t ransportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of re liability and can directly threaten human lives in case of failure or malfunction of the product or may cause har m to human bodies, nor shall they grant any guarantee thereof. if you should intend to use our products for app lications 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 n o consultation or inquiry before the intended use, our customer shall be solely responsible for the use. 61610 sy 20100405-s0010 no.a1783-1/9
LA4708N specifications maximum ratings at ta = 25 c parameter symbol conditions ratings unit v cc max 1 no signal, t = 60s 24 v maximum supply voltage v cc max 2 16 v surge supply voltage v cc surge t 0.2s, single giant pulse 50 v maximum output current i o peak per channel 4.5 a allowable power dissipation pd max arbitrarily large heat sink 37.5 w operating temperature topr ? 35 to + 85 c storage temperature tstg ? 40 to + 150 c * set v cc , r l in a range that does not exceed pd max = 37.5w operating conditions at ta = 25 c parameter symbol conditions ratings unit recommended supply voltage v cc 13.2 v operating voltage range v cc op range where pd max is not exceeded 9 to 16 v recommended load resistance r l 4 recommended load resistance range r l op 2 to 4 electrical characteristics at ta = 25 c, v cc = 13.2v, r l = 4 , f = 1khz, rg = 600 parameter symbol conditions min typ max unit quiescent current i cco 70 150 250 ma standby current lst 10 60 a voltage gain vg 38 40 42 db total harmonic distortion thd p o = 2w 0.07 0.4 % p o 1 thd = 10% 16 20 w p o 2 thd = 10%, v cc = 14.4v 24 w output power p o 3 thd = 10%, r l = 2 30 w output offset voltage v n offset rg = 0 ? 300 + 300 mv output noise voltage v no rg = 0, b.p.f. = 20hz to 20khz 0.1 0.5 mvrms ripple rejection ratio svrr rg = 0, f r = 100hz, v r = 0dbm 40 50 db channel separation chsep rg = 10k , v o = 0dbm 50 60 db input resistance r i 21 30 39 k standby pin applied voltaga vst amp on, applied through 10k 2.5 v cc v package dimensions unit : mm (typ) 3109a no. a1783-2/9 1 18 36.8 (30.0) (r1.7) 4.5 heat spreader 1.0 2.25 6.0 15.0 max 0.8 min 8.0 0.4 0.5 2.0 (1.4) (13.8) (11.0) sanyo : sip18h
LA4708N 160 0 40 35 30 25 20 15 10 5 3.5 pd max -- ta ambient temperature, ta -- c allowable power dissipation, pd max -- w jk470801 -20 0 20 40 60 80 100 120 140 f = 1.5c/w 2.0c/w 3.2c/w 4.1c/w 7.0c/w no fin jc = 2.0c/w arbitrarily large heat sink 1000 2 3 2 10 7 5 3 f -- s f heat sink area, s f -- cm 2 heat sink thermal resistance, f -- c/ w jk470802 23 57 100 23 57 ai heat sink, t = 1.5mm tightening torque 39n cm with silicone grease applied block diagram + c1 + in1 2.2f/ 6.3v 100f/ 16v + + c4 in2 2.2f/ 6.3v 33f/ 6.3v r1 pre gnd 10k off on +5v - + in predriver power predriver predriver predriver - + in power power power c2 ripple filter pop noise prevention circuit c3 pin 10 : no connection. pins 1,9 : don't use. overvoltage/ surge protector thermal shutdown v cc output pin-to-v cc short protector output pin-to-v cc short protector output pin-to-gnd short protector output pin-to-gnd short protector power gnd1 power gnd2 v cc 2 v cc n.c v cc 1 + 2200 f 0.1f 0.1f 2.2 c5 ?? ?? ?? ?? ?? inverting out1 noninverting out1 - + r l 0.1f 0.1f 2.2 2.2 inverting out2 noninverting out2 - + polyester film capacitor load short protector c7 r2 2.2 r3 c6 bias circuit standby sw load short protector 18 1 3 2 4 5 7 6 8 9 10 11 c8 r4 r5 c9 r l 2 to 4 12 13 14 15 16 17 2 to 4 each pin voltage v cc = 13.2v, 5v applied through stby = 10k , r l = 4 , rg = 0 pin no. 1 2 3 4 5 6 name in1 dc pre-gnd stby on time pin voltage (v) 0.29 1.58 6.55 0 3.2 2.28 pin no. 7 8 9 10 11 12 name in2 pop - n.c v cc 2 ? out 2 pin voltage (v) 1.58 2.08 0.29 0 13.2 6.5 pin no. 13 14 15 16 17 18 name pwr-gnd 2 + out 2 + out 1 pwr-gnd 1 ? out 1 v cc 1 pin voltage (v) 0 6.5 6.5 0 6.5 13.2 no. a1783-3/9
LA4708N sample print pattern + c 5 c 6 c 7 c 8 c 9 r 2 r 3 r 4 r 5 v cc out1 out2 gnd gnd c 4 c 3 c 2 c 1 r 1 in2 in1 stb + + + + 1 dng erp copper foil area 90 105mm 2 description of external components c1, c4 input capacitors 2.2 f is recommended. f l can be varied by c1, c4 capacitances to adjust the bass range. c2 decoupling capacitor (ripple filter) c3 amplifier on time setting capacitor 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.) c5 power supply capacitor c6, c7, c8, c9 oscillation blocking capacitors use polyester film capacitors (mylar capacitors) with good temperature character istics. (r2, r3, r4, and r5 used jointly.) since stability may be af fected slightly by th e pattern layout, etc., 0.1 f or more is recommended. r1 standby switch current limiting resistor 10k is recommended (when the applied voltage for the standby switch is 2.5v to 13.2v). this resistor cannot be removed. 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 500 a or less: r1 = ? 10k applied voltage ? 1.4v 500 a 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 2.2 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 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 opera te 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 co nnected internally, they must be left open. ? pin 10 is an nc pin (no internal connection). no. a1783-5/9
LA4708N 28 0 200 180 160 140 120 100 80 60 40 20 i cco -- v cc jk470806 0 4 8 12 16 20 24 r l = open rg = 0 v st = 5v supply voltage, v cc -- v quiescent current, i cco -- ma 20 0 60 50 40 30 20 10 p o -- v cc jk470809 6 8 10 12 14 16 18 r l = 2 r l = 4 output power, p o -- w f = 1khz rg = 600 thd = 30% dual channel drive supply voltage, v cc -- v thd -- p o jk470811 f = 10khz 100 hz 1khz 3 2 10 7 5 3 2 1.0 7 5 3 2 0.1 7 5 57 0.1 23 57 1.0 23 57 10 23 v cc = 13.2v r l = 2 rg = 600 dual channel drive total harmoinc distortion, thd -- % output power, p o -- w 100k 3 5 3 2 1.0 7 5 3 2 0.1 7 5 thd -- f jk470812 10 23 57 100 23 57 1k 23 57 10k 23 57 total harmoinc distortion, thd -- % v cc = 13.2v r l = 4 rg = 600 p o = 2w input frequency, f -- hz -10 4 2 0 -2 -4 -6 -8 f response jk470813 v cc = 13.2v r l = 4 rg = 600 v o = 0dbm at f = 1khz 100k 10 23 57 100 23 57 1k 23 57 10k 23 57 input frequency, f -- hz response -- db jk470808 20 4 44 40 36 32 28 24 20 16 12 8 48 p o -- v cc 6 8 10 12 14 16 18 r l = 2 r l = 4 output power, p o -- w supply voltage, v cc -- v f = 1khz rg = 600 thd = 10% dual channel drive exceeding pd max 5 5 5 3 2 10 7 5 3 2 1.0 7 5 3 2 0.1 7 p o -- v in jk470807 357 10 23 57 100 23 v cc = 14.4v v cc = 13.2v output power, p o -- w input level, v in -- mvrms r l = 4 f = 1khz rg = 600 vg = 40db dual channel drive 5 3 5 3 2 10 7 5 3 2 1.0 7 5 3 2 0.1 7 5 thd -- p o jk470810 0.1 23 57 1.0 23 57 10 23 f = 10khz 100 hz 1khz v cc = 13.2v r l = 4 rg = 600 output power, p o -- w total harmoinc distortion, thd -- % dual channel drive no. a1783-6/9
LA4708N 7 10 24 22 20 18 16 14 12 p o -- f input frequency, f -- hz output power, p o -- w jk470814 10 23 57 100 23 57 1k 23 57 10k 23 5 v cc = 13.2v r l = 4 rg = 600 vg = 40db thd = 10% 3% 1% 2 2 1.0 7 5 3 2 0.1 7 5 3 v no -- rg input resistance, rg -- output noise voltage, v no -- mvrms jk470816 23 57 1k 23 57 10k 23 57 100k v cc = 13.2v r l = 4 din audio 100k -100 20 0 -20 -40 -60 -80 ch sep -- f input frequency, f -- hz channel separation, chsep -- db jk470815 10 23 57 100 23 57 1k 23 57 10k 23 57 v cc = 13.2v r l = 4 rg = 10k v o = 0dbm ch1 ch2 ch2 ch1 20 -100 0 -20 -40 -60 -80 svrr -- v cc supply voltage, v cc -- v ripple rejection ratio, svrr -- db jk470817 4681012141618 out1 out2 r l = 4 rg = 0 f r = 100hz v ccr = 0dbm 2200 f (power supply capacitor) is changed to 0.47 f (mylar) 100k -100 20 0 -20 -40 -60 -80 svrr -- f r ripple frequency, f r -- hz ripple rejection ratio, svrr -- db jk470818 10 23 57 100 23 57 1k 23 57 10k 23 57 out1 out2 v cc = 13.2v r l = 4 rg = 0 v ccr = 0dbm the value of power supply capacitor is 0.47 f (mylar) 2.2 -100 0 -20 -40 -60 -80 svrr -- v ccr power supply ripple voltage, v ccr -- vrms ripple rejection ratio, svrr -- db jk470819 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 fr = 100hz fr = 3khz out1 out1 out2 out2 v cc = 13.2v r l = 4 f r = 100hz/3khz the value of power supply capacitor is 0.47 f (mylar) calculate as svrr = 20 log v o v ccr dual channel drive 7 2 2 100 7 5 3 2 10 7 5 3 2 2 10 7 5 3 2 1.0 7 5 3 pd, i cc -- p o output power, p o -- w power dissipation, pd -- w jk470820 0.1 23 57 1.0 23 57 10 23 5 7 pd (v cc = 16v) pd (v cc = 13.2v) i cc (v cc = 16v) r l = 4 rg = 600 f = 1khz dual channel drive current drain, i cc -- a pd, i cc -- p o output power, p o -- w power dissipation, pd -- w current drain, i cc -- a jk470821 2 2 100 7 5 3 2 10 7 5 3 7 0.1 2 23 35 57 7 1.0 23 57 10 235 2 2 10 7 5 3 2 1.0 7 5 3 pd (v cc = 16v) pd max = 37.5w r l = 2 rg = 600 f = 1khz pd (v cc = 13.2v) i cc (v cc = 16v) dual channel drive allowable power dissipation package no. a1783-7/9
LA4708N 100 16 36 34 32 30 28 26 24 22 20 18 p o -- ta ambient temperature, ta -- c output power, p o -- w jk470824 -40 -20 0 20 40 60 80 r l = 4 r l = 2 28 0 12 10 8 6 4 2 v n -- v cc supply voltage, v cc -- v output pin voltage, v n -- v jk470822 04812162024 r l = open rg = 0 v cc = 13.2v rg = 600 f = 1khz thd = 10% 100 0 200 180 160 140 120 100 80 60 40 20 i cco -- ta ambient temperature, ta -- c quiescent current, i cco -- ma jk470823 -40 -20 0 20 40 60 80 v cc = 13.2v r l = open rg = 0 8 0 8 7 6 5 4 3 2 1 v n -- v st standby pin applied voltage, v st -- v output pin voltage, v n -- v jk470826 01234567 v cc = 13.2v r l = 4 rg = 0 apply v st to standby pin (pin 5) through 10k. 2 0 1.2 1.0 0.8 0.6 0.4 0.2 amp on time -- c3 c3 -- f amp on time -- s jk470827 23 57 10 23 57 100 v cc = 13.2v v st = 5v (apply to pin 5 through 10k.) dual channel drive 2 5 3 2 0.1 7 5 3 thd -- ta ambient temperature, ta -- c total harmonic distortion, thd -- % jk470825 100 -40 -20 0 20 40 60 80 v cc = 13.2v r l = 4 rg = 600 f = 1khz p o = 2w dual channel drive ps no. a1783-8/9
LA4708N LA4708N sanyo semiconductor co.,ltd. assumes no responsib ility for equipment failures that result from using products at values that exceed, even momentarily, rate d values (such as maximum ra tings, operating condition ranges, or other parameters) listed in products specif ications of any and all sanyo semiconductor co.,ltd. products described or contained herein. sanyo semiconductor co.,ltd. strives to supply high-qual ity 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 acci dents or events that could endanger human lives, trouble that could give rise to smoke or fire, or accidents that could cause dam age to other property. when designing equipment, adopt safety measures so that these kinds of accidents or e vents cannot occur. such measures include but are not limited to protective circuits and error prevention c ircuits for safe design, redundant design, and structural design. upon using the technical information or products descri bed herein, neither warranty nor license shall be granted with regard to intellectual property rights or any other rights of sanyo semiconductor co.,ltd. or any third party. sanyo semiconductor co.,ltd. shall not be liable f or 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. information (including circuit diagr ams and circuit parameters) herein is for example only; it is not guaranteed for volume production. any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. when designing equi pment, refer to the "delivery specification" for the sanyo semiconductor co.,ltd. product that you intend to use. in the event that any or all sanyo semiconductor c o.,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 conc erned in accordance with the above law. no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any in formation storage or retrieval system, or otherwise, without the prior written consent of sanyo semiconductor co.,ltd. ps no. a1783-9/9 sanyo semiconductor co.,ltd. assumes no responsib ility for equipment failures that result from using products at values that exceed, even momentarily, rate d values (such as maximum ra tings, operating condition ranges, or other parameters) listed in products specif ications of any and all sanyo semiconductor co.,ltd. products described or contained herein. sanyo semiconductor co.,ltd. strives to supply high-qual ity 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 acci dents or events that could endanger human lives, trouble that could give rise to smoke or fire, or accidents that could cause dam age to other property. when designing equipment, adopt safety measures so that these kinds of accidents or e vents cannot occur. such measures include but are not limited to protective circuits and error prevention c ircuits for safe design, redundant design, and structural design. upon using the technical information or products descri bed herein, neither warranty nor license shall be granted with regard to intellectual property rights or any other rights of sanyo semiconductor co.,ltd. or any third party. sanyo semiconductor co.,ltd. shall not be liable f or 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. information (including circuit diagr ams and circuit parameters) herein is for example only; it is not guaranteed for volume production. any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. when designing equi pment, refer to the "delivery specification" for the sanyo semiconductor co.,ltd. product that you intend to use. in the event that any or all sanyo semiconductor c o.,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 conc erned in accordance with the above law. no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any in formation storage or retrieval system, or otherwise, without the prior written consent of sanyo semiconductor co.,ltd. this catalog provides information as of june 2010. specifications and info rmation herein are subject to change without notice. ps no. a1783-9/9
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