page 1 of 5 1. overview the HD1875 is a 20w mono audio power amplifier with high fidelity characterized by low harmonic distortion, high output power, few external components and it can safeguard the output against overloads, thermal runaway, short circuit and so on. besides these above, with advanced manufacturing process, the HD1875 can be used for hi -fis, stereo recorders and other audio systems. its features are: output p ower as high as over 30w open loop gain 90 db (typ) low thd: f = 1 k hz p o = 20w thd = 0.015 typ wide power bandwidth: f p = 70 khz short circuit protection system thermal shut - down system high output current: i om = 4a (typ) wide supply voltage range: v cc =16 ~60v built - in output protection diode r ipple rejection ( 94db ) fzip5 2. block diagram and pin description 2.1 block diagram 1 2 3 4 5 hsin semiconductor pte ltd www.hsin.com.s g 20w audio power amp HD1875
page 2 of 5 2.2 p in description pin no. symbol description pin no. symbol description 1 in signal input 4 out output 2 nf negative feedback 5 v cc v cc 3 v ee /gnd ground 3. electrical characteristics 3.1 absolute maximum ratin gs unless otherwise specified, t amb = 25 parameter symbol value unit supply voltage v cc 60 v input voltage v in v cc v thermal resistance 1 jc 3 /w thermal resistance 2 ja 73 /w power dissipation p d 41 .6 w operating temperature t amb - 20 ~ 70 sto rage temperature t stg - 65~150 notes: with the operating temperature above 55 , the maximum output power into a load of 4 will be decreased based on the heat sink of 1 /w . 3.2 electrical characteristics unless otherwise specified , t amb = 25 , v cc = 25v , r l = 8 , a v = 26 db, f = 1 k hz , p o = 20w value parameter symbol test conditions min typ max unit quiescent current i cc q v i = 0 70 100 ma output power p o thd = 1 25 w 0.015 f = 20 k hz 0.05 0.4 r l = 4 0.022 total harmonic distortion thd r l = 4 , f = 20 k hz 0.07 0.6 offset voltage v fs - 15 1 15 mv input b ias c urrent i b - 2 0.2 2 u a input offset current i fs - 0.5 0 0.5 u a bandwidth bw f = 20 k hz 5.5 mhz open loop voltage gain a vo dc 90 db v cc , 1 k hz , 1v 52 95 power supply rejection ra tio psrr v ee , 1 k hz , 1v 52 83 db slew rate sr 70 k hz , bw 8 v/ us max output current i m v out = v cc - 10v 3 4 a equivalent input noise voltage v no r s = 600 , ccir 3 u v
page 3 of 5 4. characteristics curve 0 5 10 15 20 25 20 40 60 80 100 0 supply current icc(ma) icc --- vcc supply voltage vcc(v) 30 0 5 10 15 20 25 5 10 15 20 25 0 output power po(w) po --- vcc supply voltage vcc( v) 30 30 35 r =8 thd=1 l 6 4 2 0 -2 -4 -6 -25 -20 -15 -10 -5 0 5 10 15 20 25 output voltage vout(v) iout --- vout output current iout (a) (safe area 0 5 10 15 10 15 20 25 30 0 output power po(w) 20 25 30 5 35 40 45 50 rl=8 fo=1khz vcc= 30v vcc= 25v vcc= 20v vcc= 15v power dissipation p (w) d p --- po d 0 5 10 15 10 15 20 25 30 0 output power po(w) 20 25 30 5 35 40 45 50 vcc= 30v vcc= 25v vcc= 20v vcc= 15v power dissipation p (w) d p --- po d rl=4 fo=1khz 0 20 40 60 80 100 10 15 20 25 30 0 power dissipation p (w) p --- tamb ambient temperature tamb( 120 140 160 5 35 40 45 d d infinite rth 1 /w rth 2 /w rth 5 /w rth 10 /w rth
page 4 of 5 5. application circuit 5. 1 ocl way fig 5.1 1 2 3 4 5 vin vout v v 1m 22k 1k 1 4 8 0.1uf 100uf 0.22uf 100uf 0.1uf 22uf 2.2uf 22k ee cc 20 50 100 200 500 1k 20 40 80 90 100 0 power supply psrr --- f frequency f(hz) 2k 70 60 50 30 10 5k 10k 20k vcc v ref. input rs=0 r =4 1vrms ee ripple rejection psrr(db) l 20 50 100 200 500 1k 0.02 0.04 0.08 0.09 0.1 0 total harmonic distortion thd --- f frequency f(hz) 2k 0.07 0.06 0.05 0.03 0.01 5k 10k 20k r =4 r =8 vcc= 25v po=10w thd( ) l l 0.01 0.1 1 0.1 1.0 10 100 thd --- po total harmonic distortion output power po(w) rl=8 rl=4 vs 25v thd( ) 0 5 10 15 20 25 50 100 150 200 250 0 ibias --- vcc supply voltage vcc(v) 30 300 input bias current ibias(na) ta=70 ta=25 ta=0
page 5 of 5 5 .2 otl way fig 5.2 5 .3 notes (1)be careful the arrangement of the large signal ground and the small s ignal ground in case of oscillation. (2) the anti - oscillation of the output ground should be as close as possible to ic pins. (3) using large enough heat sink if necessary according to the practical situation. 6. package dimensions 1 2 3 4 5 + vin vcc vout 1m 22k 10k 1 4 8 0.1uf 100uf 0.22uf 10uf 1uf 200k 22k 22k 2200uf 10uf
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