tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw PT2001 pre1.0 - 1 - october , 2007 2.2w2 class-d audio power amp. with headphone output preliminary PT2001 description the PT2001 is a class-d power am plifier designed for audio equipments, maximum output power can reach up to 2.2w x 2 (vdd= 5v, rl= 4 ? , thd= 10%). the PT2001 composed of exclusively designed class-d circuitry (patented) by ptc, along with the most advanced semi-conductor technology. when compared to the traditional class-ab amplifiers , the PT2001?s has a much higher efficiency ( > 85%), low heat dissipation, and produces superior audio quality. PT2001?s external circuitry is simple and easily accessible, and consists of flawless self-prote ction capabilities. the chip?s packaging is small, thus it occupies an insignificant amount of spac e on the circuit board; t herefore, making it the predominant choice when it comes to audio amplifiers. features ? cmos technology ? stereo, differential i nput for improved cmrr. ? maximum output power 2.2w (4 ? ) x 2 @ thd=10% ? operating on both btl (bridged tight loaded) and se (single ended) configuration ? no lc filter needed when driving speakers in btl configuration. ? driving 32 ? headphone on se configuration. ? highly improved psrr ( > 70db) for powered from noisy pc-bus power. ? automatic gain-reduced during headphone attached to the amplifier. ? shutdown function ? pop noiseless in shutdown and power on/off period ? built-in short circuit protection ? built-in overheat protection ? high efficiency (8 ? load > 85%), low heat dissipation ? tssop 20 pins miniature packages for saving pcb size. applications ? portable media player ? portable dvd player ? lcd monitor ? small multimedia speakers ? hand-free phone ? laptop ? other audio applications
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw PT2001 pre1.0 - 2 - october , 2007 2.2w2 class-d audio power amp. with headphone output preliminary PT2001 pin configuration
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw PT2001 pre1.0 - 3 - october , 2007 2.2w2 class-d audio power amp. with headphone output preliminary PT2001 appication circuit diagram 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 nc inrp inrn vc c hpin sd ref inln inlp nc outlp gnd gndl vddl outln outrn vddr gndr gnd outrp c1 0.22uf c2 0.22uf c3 1uf c4 1uf c5 0.22uf c6 0.22uf c8 1uf c7 1uf c10 1nf c11 1nf c12 1nf c13 1nf c14 0.22uf c15 0.22uf r- i n l-in l3 fb l4 fb l5 fb l6 fb l7 100uh l8 100uh 2 3 1 11 10 u1 phonejack r3 82 r4 82 c16 220uf c17 220uf r5 1k r6 1k r1 150k r2 150k sw1 shutdown l1 fb l2 fb c9 10uf PT2001 sp1 r-speaker sp2 l-speaker +5v notes: 1. r3 and r4 is use to reduce gain when headphone is attached to the PT2001, recommend range is from 56 ? to 82 ? value depends on headphone?s sensitivity. larger resistance will limit the maximum volume of headphone and also reduced residual noise. 2. speaker output can not use lc low pass filter because the chip would malfunction. 3. parts list : ptc parts no. vendor?s name component type vendor no. specification l1, l2, l3,l4,l5,l6 3l coils ferrite bead smb-201209-f2-121p dcr<0.1 ? isat>3a, z=120 ? @100mhz l7,l8 3l coils inductor smtsdr 322520c-101k l=100h, isat=100ma
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw PT2001 pre1.0 - 4 - october , 2007 2.2w2 class-d audio power amp. with headphone output preliminary PT2001 order information valid part number package type top code PT2001-tx 20 pins, tssop, 173mil PT2001-tx
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