o0808 ms jk/92900rm(ot) no.6632-1/8 http://onsemi.com semiconductor components industries, llc, 2013 may, 2013 LA4628 overview the LA4628 is a 2-channel general-purpose btl audio power amplifier provided in a miniature package. it was designed for the best possible audio quality and features an extended low band roll-off frequency provided by a newly-developed nf circuit that does not require an exte rnal capacitor. furthermore, crosstalk, which can cause muddiness in the audio output, has been significantly reduced by both circuit and wiring pattern improvements. thus this amplifier can provide pow erful lows and clear highs. note that this device is pin compatible with the 13.5w 2-channel la4625, and allows end products differentiated by their power rating to share the same printed circuit board. features ? total output : 20w+20w (at v cc = 13.5v, r l = 4 , thd = 10%) ? high-fidelity design (f l < 10hz, f h = 130khz) ? extremely low impulse noise levels ? an arbitrary amplifier startup time can be set up with external components. ? full complement of built-in protection circuits (includes circuits that protect against shorting to v cc , shorting to ground, load shorting, overvoltages and excessive temperatures) specifications maximum ratings at ta = 25 c parameter symbol conditions ratings unit maximum supply voltage v cc max no signal 24 v maximum output current i o peak per channel 4 a allowable power dissipation pd max with an arbitrarily large heat sink 32.5 w operating temperature topr -20 to +85 c storage temperature tstg -40 to +150 c orderin g number : en6632a monolithic linear ic 20w 2-channel btl power amplifier for general audio stresses exceeding maximum ratings may damage the device. maximum ratings are stress ratings only. functional operation above the recommended oper ating conditions is not implied. extended exposure to stresses above the recommended operating conditions may affect device reliabili ty.
LA4628 no.6632-2/8 operating conditions at ta = 25 c parameter symbol conditions ratings unit recommended supply voltage v cc 13.5 v recommended load resistance range r l op 4 to 8 allowable operating supply voltage range v cc op 9 to 20 v note : with v cc , r l , and the output level in ranges such that th e pd max for the heat sink used is not exceeded. electrical characteristics at ta = 25 c, v cc = 13.5v, r l = 4 , f = 1khz, rg = 600 parameter symbol conditions ratings unit min typ max quiescent current i cco with rg = 0 and r l open. 70 130 250 ma standby mode current drain i st standby mode (amplifier off), with no power supply capacitor. 10 60 a voltage gain v g v o = 0dbm 38 40 42 db total harmonic distortion thd p o = 1w, filter = flat 0.06 0.2 % output power p o 1 v cc = 13.5v, thd = 10%, r l = 4 16 20 w p o 2 v cc = 16.5v, thd = 10%, r l = 4 30 w output offset voltage v n offset rg = 0 -300 +300 mv output noise voltage v no rg = 0, bpf = 20hz to 20khz 0.1 0.5 mv ripple rejection ratio svrr rg = 0, v r = 0dbm, f r = 100hz 40 50 db channel separation chsep rg = 10k , v o = 0dbm 50 60 db input resistance ri 21 30 39 k standby pin applied voltage v st amplifier on (applied through an external 10k resistor) 2.5 v cc v package dimensions unit : mm (typ) 3113b 0 pd max -- ta -20 35 25 30 15 20 10 5 20 0 40 60 80 100 120 140 160 f = 3 ? c/w f = 4 ? c/w f = 7 ? c/w jc = 2 ? c/w ? fin f = 10 ? c/w 32.5 20.83 13.9 10.4 3.1 infinite heat sink allowable power dissipation, pd max -- w ambient temperature, ta -- ? c ai heat sink mounting torque 39n cm flat washer silicone grease applied
LA4628 no.6632-3/8 block diagram 0.1 f 0.1 f r4 c9** c8** r5 2.2 2.2 r l 4 r l 4 -out2 +out2 ? + standby sw off ripple filter + bias circuit standby sw pop noise prevention circuit predriver predriver power power load short protector 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 predriver predriver power power over voltage / surge protector thermal shut down load short protector v cc + + on r1 10k +5v c4 2.2 f 10v 33 f 10v 0.47 f 10v 2.2 f 10v c1 100 f/16v v cc c5 2200 f 25v + -out1 +out1 ? + power gnd2 + + c3 c10 ** (polyester film capacitor) + ? in c2 pre gnd in2 c3 sets the amplifier starting time (approximately 0.6 seconds when 33 f) c10 impulse noise reduction (note : the device?s ability to withstand shorting to v cc or shorting to ground when v cc is around 16v may be reduced as the value of this capacitor is increased. we recommend 0.47 f.) power gnd1 14 2 1 3 4 6 7 5 11 12 13 0.1 f 0.1 f r2 c7** c6** r3 2.2 2.2 9 10 8 + ? in
LA4628 no.6632-4/8 pin voltages v cc = 13.5v, with 5v applied to stby through a 10k resistor, r l = 4 , rg = 0 pin no. 1 2 3 4 5 6 7 pin name in1 dc pre?gnd stby on time in2 pop pin voltage 1.55v 6.63v 0v 3.21v 2.32v 1.55v 2.07v pin no. 8 9 10 11 12 13 14 pin name +out2 -out2 pwr?gnd +out1 pwr?gnd -out1 v cc pin voltage 6.6v 6.5v 0v 6.5v 0v 6.6v 13.5v external components c1 and c4 : input capacitors. a value of 2.2f is recommended. determine the polarity based on the dc potential of the circuit connected directly to the LA4628 front end. note that the low band response can be adjusted by varying f l with the capacitors c1 and c4. c2 : decoupling capacitor (ripple filter) c3 : sets the amplifier starting time, which will be approximately 0.6 seconds for a value of 33f. the starting time is proportional to the value of th is capacitor, and can be set to any desired value. c5 : power-supply capacitor c6, c7, c8, and c9 : oscillation prevention capacitors. use polyester f ilm capacitors (mylar capacitors) with excellent characteristics. (note that the se ries resistors r2, r3, r4, and r5 ar e used in conjunction with these capacitors to achieve stable amplifier operation.) a value of 0.1f is recommended. c10 : impulse noise reduction capacitor. a value of 0. 47f is recommended. caution is required when selecting the value for this capacitor, since increasing its value influences the operation of the circuits that protect against shorting the amplifier output pins to v cc or to ground when higher v cc voltages (approximately 16v or higher) are used. r1 : standby switch current limiting resistor. a value of 10k is recommended when a voltage in the range 2.5 to 13.5v will be applied as the standb y switching voltage. note that this resistor is not optional : it must be included. ic internal characteristics and notes 1. standby function ? pin 4 is the standby switch. a voltage of 2.5v or higher must be applied through an external resistor to turn the amplifier on. ? if a voltage of over 13.5v will be applied as the standby mode switching voltage, use the following formula to determine the value of r1 so that the current entering at pin 4 remains under 500a. r1 = ? 1.4 ? 10k 500 a 2. muting function ? pin 5 connects the capacitor that determines the starting tim e to prevent impulse noise. it can also be used to mute the amplifier output by shorting pin 5 to ground. when this function is used, the recovery time depends on c3. 4 r1 10k 500 a or lower about 1.4v (2v be ) pin 4 internal equivalent circuit applied standby voltage
LA4628 no.6632-5/8 3. impulse noise improvements ? while the LA4628 achieves a low level of impulse noise, if even further reductions in impulse noise at power on/off (and when switching into or out of standby mode) a 0.47f capacitor may be inserted between pin 7 and the pre gnd pin (pin 3). (pin 7 is the output amplifier bias pin. since the ability to withstand shorting the output pins to v cc or ground is reduced for supply voltages over 16v if the pin 7 capacitance is large, we recommend a value of 0.47f or lower for this capacitor.) 4. protection circuits ? due to the system structure of the protection circuit for shorts to v cc or ground, if there is a dc resistance between the amplifier output pins and ground, the protection circuit may operate when power is first applied and the amplifier may fail to turn on. the basic design approach we recommend is not to adopt any designs in which there is a dc resistance between the amplifier outputs and ground. ? the LA4628 includes a built-in thermal protection circuit to prevent the ic from being damaged or destroyed if abnormally high temperatures occur. this thermal protectio n circuit gradually reduces the output if the ic junction temperature (tj) reaches the range 170 to 180 c due to inadequate heat sinking or other problem. if the temperature falls, the amplifier will restart automatically. ? the LA4628 also includes other protection circuits. use of these circuits also requires care during end product design and testing. 5. other notes ? the LA4628 is a btl power amplifier. when testing th is device, the ground systems for the test equipment connected to ic inputs, and that for the test equipment connected to ic outputs, must be isolated. do not use a common ground. printed circuit pattern (copper foil side) gnd gnd v cc gnd c5 r2 c6 -out1 c1 14 LA4628 1 + + + + + + in1 in2 c3 c2 r1 c4 c10 stb +out1 -out2 +out2 r3 c7 r4 c8 r5 c9
LA4628 no.6632-6/8 15 16 17 18 0 25 p o -- v cc 6789 11 10 12 13 14 10 5 15 30 35 20 40 0.01 p o -- v in 1.0 23 57 10 23 57 100 23 57 1k 2 3 5 7 0.1 1.0 2 3 5 7 10 2 3 5 7 100 2 3 5 7 0 25 p o -- f thd -- p o 10 100 1k 10k 100k 23 57 3 57 2357 2357 2 5 10 15 20 -10 -8 -6 -4 -2 0 2 f response 10 23 57 100 23 57 1k 23 57 10k 100k 23 57 0.01 10 7 5 3 2 7 5 3 2 7 5 3 2 0.1 1.0 23 57 10 23 57 100 23 57 1.0 0.1 0.01 2 3 5 7 0.1 2 3 5 7 1.0 10 2 3 5 7 thd -- p o 0.1 23 57 1.0 23 57 10 100 23 57 -10 -40 -50 -60 -70 -80 -90 0.01 0.1 2 3 5 7 1.0 2 3 5 7 10 2 3 5 7 thd -- f 10 23 57 100 23 57 1k 23 57 10k 100k 23 57 chsep -- f 10 100 23 57 1k 23 57 10k 23 57 100k 23 57 -30 -20 v cc = 13.5v r l = 4 rg = 10k v o = 0dbm f = 1khz rg = 600 thd = 10% v cc = 13.5v r l = 4 f = 1khz v cc = 13.5v r l = 4 rg = 600 v o = 0dbm at 1khz v cc = 13.5v r l = 6 rg = 600 r l = 4 r l = 6 v cc = 13.5v r l = 4 rg = 600 v cc = 13.5v r l = 4 rg = 600 v cc = 13.5v r l = 4 r o = 1w thd = 10% thd = 1% 10khz 100hz 1khz thd = 3% 10khz 100hz 1khz 0 input voltage, v in -- mvrms output power, p o -- w supply voltage, v cc -- v frequency, f -- hz frequency, ta -- c response -- db output power, p o -- w output power, p o -- w frequency, f -- hz output power, p o -- w output power, p o -- w total harmonic distortion, thd -- % total harmonic distortion, thd -- % total harmonic distortion, thd -- % frequency, f -- hz channel separation, chsep -- db ch1 ? 2 ch2 ? 1
LA4628 no.6632-7/8 v no -- rg 2 100 357 2 1k 357 2 10k 100k 357 7 5 3 2 1.0 7 5 3 2 0.1 0.01 svrr -- v cc svrr -- f r 7 9 11 13 15 17 19 21 23 5 0 -20 -40 -60 -80 -100 -120 -100 svrr -- v cc r pd -- p o (r l = 4 ) pd -- p o (r l = 6 ) 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 -80 -60 -40 -20 -100 -80 -60 -40 -20 0 10 23 57 100 23 57 1k 23 57 10k 100k 23 57 0 32 28 24 20 16 12 0.1 1.0 23 57 10 23 57 100 23 57 32 28 24 20 18 12 8 4 0 0.1 1.0 10 100 23 57 23 57 23 57 0 1 2 3 4 5 6 i cc -- p o 0.1 23 57 1.0 23 57 100 10 23 57 v cc = 13.5v r l = 4 din audio rg = 0 f r = 100hz v cc r = 0dbm v cc = 13.5v r l = 4 rg = 0 v cc r = 0dbm v cc = 13.5v r l = 4 rg = 0 r l = 4/6 rg = 600 f = 1khz pd(16.5v) r l = 4 r l = 6 pd(13.5v) 100hz out1 3khz out1 3khz out2 100hz out2 pd (16.5v) pd (13.5v) v o v cc r out1 out2 out2 out1 supply voltage, v cc -- v ripple rejection ratio, svrr -- db ripple rejection ratio, svrr -- db signal source resistance, rg -- power supply ripple, v cc r -- vrms ripple frequency, f r -- hz output power, p o -- w/ch output power, p o -- w/ch output noise voltage, v no -- mvrms ripple rejection ratio, svrr -- db power dissipation, pd -- w power dissipation, pd -- w current drain, i cc -- a output power, p o -- w/ch r l = 6 rg = 600 f = 1khz calculated at pd = (v cc i cc ) - (2p o ) calculated at svrr = 20log r l = 4 rg = 600 f = 1khz calculated at pd = (v cc i cc ) - (2p o )
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