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? semiconductor components industries, llc, 2007 september, 2007 - rev. 6 1 publication order number: ncp2820/d ncp2820 series 2.65 w filterless class-d audio power amplifier the ncp2820 is a cost-effective mono class-d audio power amplifier capable of delivering 2.65 w of continuous average power to 4.0 from a 5.0 v supply in a bridge tied load (btl) configuration. under the same conditions, the output power stage can provide 1.4 w to a 8.0 btl load with less than 1% thd+n. for cellular handsets or pdas it offers space and cost savings because no output filter is required when using inductive tranducers. with more than 90% efficiency and very low shutdown current, it increases the lifetime of your battery and drastically lowers the junction temperature. the ncp2820 processes analog inputs with a pulse width modulation technique that lowers output noise and thd when compared to a conventional sigma-delta modulator. the device allows independent gain while summing signals from various audio sources. thus, in cellular handsets, the earpiece, the loudspeaker and even the melody ringer can be driven with a single ncp2820. due to its low 42 v noise floor, a-weighted, a clean listening is guaranteed no matter the load sensitivity. w ith zero pop and click noise performance ncp2820a turns on within 1 ms versus 9 ms for ncp2820 version. features ? optimized pwm output stage: filterless capability ? efficiency up to 90% low 2.5 ma typical quiescent current ? large output power capability: 1.4 w with 8.0 load (csp) and thd + n < 1% ? ultra fast start-up time: 1 ms for ncp2820a version ? high performance, thd+n of 0.03% @ v p = 5.0 v, r l = 8.0 , p out = 100 mw ? excellent psrr (-65 db): no need for voltage regulation ? surface mounted package 9-pin flip-chip cspand udfn8 ? fully differential design. eliminates two input coupling capacitors ? very fast turn on/off times with advanced rising and falling gain technique ? external gain configuration capability ? internally generated 250 khz switching frequency ? pop and click noise protection circuitry ? pb-free packages are available applications ? cellular phone ? portable electronic devices ? pdas and smart phones ? portable computer http://onsemi.com 9-pin flip-chip csp fc suffix case 499al marking diagrams zb = specific device code m = date code = pb-free package outm outp cs gnd r i sd inp inm vp input from microcontroller audio input from dac 3.7 mm 1.6 mm cs r i r i r i see detailed ordering and shipping information on page 20 of this data sheet. ordering information 8 pin udfn 2x2.2 mu suffix case 506av zb m 1 mxx ayww a1 a3 c1 1 1 8 xx = aq for ncp2820 = bd for ncp2820a a = assembly location y = year ww = work week = pb-free package
ncp2820 series http://onsemi.com 2 pin connections 9-pin flip-chip csp a3 b3 c3 a2 b2 c2 a1 b1 c1 gnd inp outm vp sd outp gnd inm vp (top view) 1 2 3 4 8 7 6 5 gnd inp outm vp sd outp inm vp udfn8 (top view) data processor gnd outp figure 1. typical application outm r f r i positive differential input inp r f r i negative differential input inm r l = 8 shutdown control sd v p cs ramp generator battery 300 k v ih v il cmos output stage pin description pin no. symbol type description csp udfn8 a1 3 inp i positive differential input. a2 7 gnd i analog ground. a3 8 outm o negative btl output. b1 2 v p i analog positive supply. range: 2.5 v C 5.5 v. b2 6 v p i power analog positive supply. range: 2.5 v C 5.5 v. b3 7 gnd i analog ground. c1 4 inm i negative differential input. c2 1 sd i the device enters in shutdown mode when a low level is applied on this pin. an internal 300 k resistor will force the device in shutdown mode if no signal is applied to this pin. it also helps to save space and cost. c3 5 outp o positive btl output.
ncp2820 series http://onsemi.com 3 maximum ratings symbol rating max unit v p supply voltage active mode shutdown mode 6.0 7.0 v v in input voltage -0.3 to v cc +0.3 v i out max output current (note 1) 1.5 a p d power dissipation (note 2) internally limited - t a operating ambient temperature -40 to +85 c t j max junction temperature 150 c t stg storage temperature range -65 to +150 c r ja thermal resistance junction-to-air 9-pin flip-chip udfn8 90 (note 3) 50 c/w - - esd protection human body model (hbm) (note 4) machine model (mm) (note 5) > 2000 > 200 v - latchup current @ t a = 85 c (note 6) 9-pin flip-chip udfn8 70 100 ma msl moisture sensitivity (note 7) level 1 stresses exceeding maximum ratings may damage the device. maximum ratings are stress ratings only. functional operation above t he recommended operating conditions is not implied. extended exposure to stresses above the recommended operating conditions may af fect device reliability. 1. the device is protected by a current breaker structure. see current breaker circuit in the description information section for more information. 2. the thermal shutdown is set to 160 c (typical) avoiding irreversible damage to the device due to power dissipation. 3. for the 9-pin flip-chip csp package, the r ja is highly dependent of the pcb heatsink area. for example, r ja can equal 195 c/w with 50 mm 2 total area and also 135 c/w with 500 mm 2 . when using ground and power planes, the value is around 90 c/w, as specified in table. 4. human body model: 100 pf discharged through a 1.5 k resistor following specification jesd22/a114. on 9-pin flip-chip, b2 pin (v p ) is qualified at 1500 v. 5. machine model: 200 pf discharged through all pins following specification jesd22/a115. 6. latchup testing per jedec standard jesd78. 7. moisture sensitivity level (msl): 1 per ipc/jedec standard: j-std-020a.
ncp2820 series http://onsemi.com 4 electrical characteristics (limits apply for t a = +25 c unless otherwise noted) (NCP2820FCT1g and ncp2820fct2g) characteristic symbol conditions min typ max unit operating supply voltage v p t a = -40 c to +85 c 2.5 - 5.5 v supply quiescent current i dd v p = 3.6 v, r l = 8.0 v p = 5.5 v, no load v p from 2.5 v to 5.5 v, no load t a = -40 c to +85 c - - - 2.15 2.61 - - - 4.6 ma shutdown current i sd v p = 4.2 v t a = +25 c t a = +85 c - - 0.42 0.45 0.8 - a v p = 5.5 v t a = +25 c t a = +85 c - - 0.8 0.9 1.5 - a shutdown voltage high v sdih 1.2 - - v shutdown voltage low v sdil - - 0.4 v switching frequency f sw v p from 2.5 v to 5.5 v t a = -40 c to +85 c 190 250 310 khz gain g r l = 8.0 285 k r i 300 k r i 315 k r i v v output impedance in shutdown mode z sd - 300 - resistance from sd to gnd rs - - 300 - k output offset voltage vos v p = 5.5 v - 6.0 - mv turn on time ncp2820 ncp2820a to n v p from 2.5 v to 5.5 v - - 9.0 1.0 - 3.0 ms turn off time ncp2820 ncp2820a to ff v p from 2.5 v to 5.5 v - - 5.0 0.5 - - ms thermal shutdown temperature ts d - - 160 - c output noise voltage vn v p = 3.6 v, f = 20 hz to 20 khz no weighting filter with a weighting filter - - 65 42 - - vrms rms output power po r l = 8.0 , f = 1.0 khz, thd+n < 1% v p = 2.5 v v p = 3.0 v v p = 3.6 v v p = 4.2 v v p = 5.0 v - - - - - 0.32 0.48 0.7 0.97 1.38 - - - - - w r l = 8.0 , f = 1.0 khz, thd+n < 10% v p = 2.5 v v p = 3.0 v v p = 3.6 v v p = 4.2 v v p = 5.0 v - - - - - 0.4 0.59 0.87 1.19 1.7 - - - - - w r l = 4.0 , f = 1.0 khz, thd+n < 1% v p = 2.5 v v p = 3.0 v v p = 3.6 v v p = 4.2 v v p = 5.0 v - - - - - 0.49 0.72 1.06 1.62 2.12 - - - - - w r l = 4.0 , f = 1.0 khz, thd+n < 10% v p = 2.5 v v p = 3.0 v v p = 3.6 v v p = 4.2 v v p = 5.0 v - - - - - 0.6 0.9 1.33 2.0 2.63 - - - - - w
ncp2820 series http://onsemi.com 5 electrical characteristics (limits apply for t a = +25 c unless otherwise noted) (NCP2820FCT1g and ncp2820fct2g) characteristic unit max typ min conditions symbol efficiency - r l = 8.0 , f = 1.0 khz v p = 5.0 v, p out = 1.2 w v p = 3.6 v, p out = 0.6 w - - 91 90 - - % r l = 4.0 , f = 1.0 khz v p = 5.0 v, p out = 2.0 w v p = 3.6 v, p out = 1.0 w - - 82 81 - - total harmonic distortion + noise thd+n v p = 5.0 v, r l = 8.0 , f = 1.0 khz, p out = 0.25 w v p = 3.6 v, r l = 8.0 , f = 1.0 khz, p out = 0.25 w - - 0.05 0.09 - - % common mode rejection ratio cmrr v p from 2.5 v to 5.5 v v ic = 0.5 v to v p - 0.8 v v p = 3.6 v, v ic = 1.0 v pp f = 217 hz f = 1.0 khz - - - -62 -56 -57 - - - db power supply rejection ratio psrr v p_ripple_pk-pk = 200 mv, r l = 8.0 , inputs ac grounded v p = 3.6 v f = 217 khz f = 1.0 khz - - -62 -65 - - db electrical characteristics (limits apply for t a = +25 c unless otherwise noted) (ncp2820mutbg) characteristic symbol conditions min typ max unit operating supply voltage v p t a = -40 c to +85 c 2.5 - 5.5 v supply quiescent current i dd v p = 3.6 v, r l = 8.0 v p = 5.5 v, no load v p from 2.5 v to 5.5 v, no load t a = -40 c to +85 c - - - 2.15 2.61 - - - 3.8 ma shutdown current i sd v p = 4.2 v t a = +25 c t a = +85 c - - 0.42 0.45 0.8 2.0 a v p = 5.5 v t a = +25 c t a = +85 c - - 0.8 0.9 1.5 - a shutdown voltage high v sdih 1.2 - - v shutdown voltage low v sdil - - 0.4 v switching frequency f sw v p from 2.5 v to 5.5 v t a = -40 c to +85 c 180 240 300 khz gain g r l = 8.0 285 k r i 300 k r i 315 k r i v v output impedance in shutdown mode z sd - 20 - k resistance from sd to gnd rs - - 300 - k output offset voltage vos v p = 5.5 v - 6.0 - mv turn on time to n v p from 2.5 v to 5.5 v - 1.0 - s turn off time to ff v p from 2.5 v to 5.5 v - 1.0 - s thermal shutdown temperature ts d - - 160 - c output noise voltage vn v p = 3.6 v, f = 20 hz to 20 khz no weighting filter with a weighting filter - - 65 42 - - vrms
ncp2820 series http://onsemi.com 6 electrical characteristics (limits apply for t a = +25 c unless otherwise noted) (ncp2820mutbg) characteristic unit max typ min conditions symbol rms output power po r l = 8.0 , f = 1.0 khz, thd+n < 1% v p = 2.5 v v p = 3.0 v v p = 3.6 v v p = 4.2 v v p = 5.0 v - - - - - 0.22 0.33 0.45 0.67 0.92 - - - - - w r l = 8.0 , f = 1.0 khz, thd+n < 10% v p = 2.5 v v p = 3.0 v v p = 3.6 v v p = 4.2 v v p = 5.0 v - - - - - 0.36 0.53 0.76 1.07 1.49 - - - - - w r l = 4.0 , f = 1.0 khz, thd+n < 1% v p = 2.5 v v p = 3.0 v v p = 3.6 v v p = 4.2 v v p = 5.0 v - - - - - 0.24 0.38 0.57 0.83 1.2 - - - - - w r l = 4.0 , f = 1.0 khz, thd+n < 10% v p = 2.5 v v p = 3.0 v v p = 3.6 v v p = 4.2 v v p = 5.0 v - - - - - 0.52 0.8 1.125 1.58 2.19 - - - - - w efficiency - r l = 8.0 , f = 1.0 khz v p = 5.0 v, p out = 1.2 w v p = 3.6 v, p out = 0.6 w - - 87 87 - - % r l = 4.0 , f = 1.0 khz v p = 5.0 v, p out = 2.0 w v p = 3.6 v, p out = 1.0 w - - 79 78 - - total harmonic distortion + noise thd+n v p = 5.0 v, r l = 8.0 , f = 1.0 khz, p out = 0.25 w v p = 3.6 v, r l = 8.0 , f = 1.0 khz, p out = 0.25 w - - 0.05 0.06 - - % common mode rejection ratio cmrr v p from 2.5 v to 5.5 v v ic = 0.5 v to v p - 0.8 v v p = 3.6 v, v ic = 1.0 v pp f = 217 hz f = 1.0 khz - - - -62 -56 -57 - - - db power supply rejection ratio psrr v p_ripple_pk-pk = 200 mv, r l = 8.0 , inputs ac grounded v p = 3.6 v f = 217 khz f = 1.0 khz - - -62 -65 - - db
ncp2820 series http://onsemi.com 7 figure 2. test setup for graphs outm outp gnd r i inp inm vp r i c i c i + - + - 4.7 f + - audio input signal load 30 khz low pass filter measurement input power supply ncp2820 notes: 1. unless otherwise noted, c i = 100 nf and r i = 150 k . thus, the gain setting is 2 v/v and the cutoff frequency of the input high pass filter is set to 10 hz. input capacitors are shorted for cmrr measurements. 2. to closely reproduce a real application case, all measurements are performed using the following loads: r l = 8 means load = 15 h + 8 + 15 h r l = 4 means load = 15 h + 4 + 15 h very low dcr 15 h inductors (50 m ) have been used for the following graphs. thus, the electrical load measurements are performed on the resistor (8 or 4 ) in differential mode. 3. for efficiency measurements, the optional 30 khz filter is used. an rc low-pass filter is selected with (100 , 47 nf) on each pwm output.
ncp2820 series http://onsemi.com 8 typical characteristics efficiency % p out (w) die temperature ( c) p out (w) 60 0 0.1 0.2 die temperature ( c) p out (w) v p = 3.6 v r l = 8 ncp2820 class ab 0.3 0.4 55 50 45 40 35 30 25 20 20 30 40 50 60 70 80 90 100 0 0.2 0.4 die temperature ( c) p out (w) v p = 5 v r l = 8 ncp2820 class ab figure 3. efficiency vs. p out v p = 5 v, r l = 8 , f = 1 khz figure 4. die temperature vs. p out v p = 5 v, r l = 8 , f = 1 khz @ t a = +25 c figure 5. efficiency vs. p out v p = 3.6 v, r l = 8 , f = 1 khz figure 6. efficiency vs. p out v p = 5 v, r l = 4 , f = 1 khz efficiency (%) p out (w) v p = 3.6 v r l = 8 class ab efficiency (%) p out (w) v p = 5 v r l = 8 ncp2820 dfn class ab 0.6 0.8 1.0 1.2 1.4 0.5 0.6 0.7 v p = 5 v r l = 4 class ab 0 10 20 30 40 50 60 70 80 100 0 0.2 0.4 0.6 0.8 1 90 ncp2820 csp 0 10 20 30 40 50 60 70 80 90 100 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 ncp2820 dfn ncp2820 csp figure 7. die temperature vs. p out v p = 5 v, r l = 4 , f = 1 khz @ t a = +25 c 0 10 20 30 40 50 60 70 80 90 0 0.5 1 1.5 2 ncp2820 dfn ncp2820 csp 160 0 0.5 1.0 v p = 5 v r l = 4 ncp2820 class ab 1.5 2.0 140 120 100 80 60 40 20 figure 8. die temperature vs. p out v p = 3.6 v, r l = 8 , f = 1 khz @ t a = +25 c
ncp2820 series http://onsemi.com 9 typical characteristics 0.01 0.1 1.0 10 0 0.1 0.2 0.3 0.4 0.5 0.6 thd+n (%) p out (w) v p = 3 v r l = 8 f = 1 khz 0.01 0.1 1.0 10 0 0.2 0.4 0.6 0.8 1.0 1.2 thd+n (%) p out (w) v p = 4.2 v r l = 8 f = 1 khz efficiency % p out (w) v p = 3.6 v r l = 4 class ab 100 0 0.2 0.4 die temperature ( c) p out (w) 0.6 0.8 90 80 70 60 50 40 30 20 1.0 v p = 3.6 v r l = 4 ncp2820 class ab figure 9. efficiency vs. p out v p = 3.6 v, r l = 4 , f = 1 khz figure 10. die temperature vs. p out v p = 3.6 v, r l = 4 , f = 1 khz @ t a = +25 c figure 11. thd+n vs. p out v p = 5 v, r l = 8 , f = 1 khz 0.01 0.1 1.0 10 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 figure 12. thd+n vs. p out v p = 4.2 v, r l = 8 , f = 1 khz figure 13. thd+n vs. p out v p = 3.6 v, r l = 8 , f = 1 khz figure 14. thd+n vs. p out v p = 3 v, r l = 8 , f = 1 khz thd+n (%) p out (w) v p = 5.0 v r l = 8 f = 1 khz 0.01 0.1 1.0 10 0 0.2 0.4 0.6 0.8 thd+n (%) p out (w) v p = 3.6 v r l = 8 f = 1 khz 0 10 20 30 40 50 60 70 80 90 0 0.2 0.4 0.6 0.8 1 1.2 ncp2820 dfn ncp2820 csp ncp2820 dfn ncp2820 csp ncp2820 dfn ncp2820 csp ncp2820 dfn ncp2820 csp ncp2820 dfn ncp2820 csp
ncp2820 series http://onsemi.com 10 typical characteristics 0.1 1.0 10 0 0.1 0.2 0.3 0.4 thd+n (%) p out (w) v p = 2.5 v r l = 4 f = 1 khz 0.5 0.6 0.1 1.0 10 0 0.2 0.4 0.6 0.8 thd+n (%) p out (w) v p = 3 v r l = 4 f = 1 khz 10 0 0.5 1.0 thd+n (%) p out (w) 1.5 2.0 1.0 0.1 0.01 2.5 v p = 5 v r l = 4 f = 1 khz figure 15. thd+n vs. pout v p = 2.5 v, r l = 8 , f = 1 khz figure 16. thd+n vs. pout v p = 5 v, r l = 4 , f = 1 khz figure 17. thd+n vs. pout v p = 4.2 v, r l = 4 , f = 1 khz figure 18. thd+n vs. pout v p = 3.6 v, r l = 4 , f = 1 khz figure 19. thd+n vs. power out v p = 3 v, r l = 4 , f = 1 khz figure 20. thd+n vs. power out v p = 2.5 v, r l = 4 , f = 1 khz 0.01 0.1 1.0 10 0 0.1 0.2 0.3 0.4 thd+n (%) p out (w) v p = 2.5 v r l = 8 f = 1 khz 0.01 0.1 1.0 10 0 0.5 1.0 1.5 2.0 thd+n (%) p out (w) v p = 4.2 v r l = 4 f = 1 khz 0.01 0.1 1.0 10 0 0.4 0.8 1.2 1.4 thd+n (%) p out (w) v p = 3.6 v r l = 4 f = 1 khz 0.2 0.6 1.0 1.0 ncp2820 dfn ncp2820 csp
ncp2820 series http://onsemi.com 11 typical characteristics 10 -20 100 1000 10000 10000 0 frequency (hz) pssr (db) inputs to gnd r l = 4 v p = 3.6 v v p = 5 v -30 -40 -50 -60 -70 -80 10 -20 100 1000 10000 100000 frequency (hz) pssr (db) inputs to gnd r l = 8 v p = 3.6 v v p = 5 v -30 -40 -50 -60 -70 -80 10 0.01 0.1 1.0 10 100 1000 10000 100000 frequency (hz) thd+n (%) v p = 2.5 v v p = 5 v 10 power supply (v) figure 21. output power vs. power supply r l = 8 @ f = 1 khz figure 22. output power vs. power supply r l = 4 @ f = 1 khz 0.01 0.1 1.0 10 100 1000 10000 100000 figure 23. thd+n vs. frequency r l = 8 , p out = 250 mw @ f = 1 khz figure 24. thd+n vs. frequency r l = 4 , p out = 250 mw @ f = 1 khz figure 25. psrr vs. frequency inputs grounded, r l = 8 , vripple = 200 mvpkpk figure 26. psrr vs. frequency inputs grounded, r l = 4 , vripple = 200 mvpkpk 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 p out (w) 4.5 5.0 thd+n = 10% r l = 8 f = 1 khz power supply (v) 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 p out (w) 4.5 thd+n = 10% thd+n = 1% 2.5 3.0 r l = 4 f = 1 khz frequency (hz) thd+n (%) v p = 2.5 v v p = 3.6 v v p = 5 v v p = 3.6 v 5.0 ncp2820 dfn ncp2820 csp thd+n = 10% ncp2820 csp thd+n = 1% ncp2820 dfn thd+n = 3%
ncp2820 series http://onsemi.com 12 typical characteristics 10 10 100 1000 100 1000 1000 0 frequency (hz) noise ( vrms) v p = 5 v r l = 8 no weighting with a weighting 10 10 100 1000 100 1000 10000 frequency (hz) noise ( vrms) v p = 3.6 v r l = 8 no weighting with a weighting 2.5 2.8 3.5 4.5 5.5 power supply (v) shutdown current (na) r l = 8 2.6 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 2.5 900 3.5 4.5 5.5 power supply (v) shutdown current (na) r l = 8 800 700 600 500 400 300 200 100 0 120 3.5 130 140 150 160 temperature ( c) quiescent current (ma) thermal shutdown v p = 3.6 v r l = 8 3.0 2.5 2.0 1.5 1.0 0.5 0 10 -20 100 1000 10000 100000 frequency (hz) cmmr (db) v p = 3.6 v r l = 8 -30 -40 -50 -60 -70 -80 figure 27. psrr vs. frequency v p = 3.6 v, r l = 8 , vic = 200 mvpkpk figure 28. thermal shutdown vs. temperature v p = 5 v, r l = 8 , figure 29. shutdown current vs. power supply r l = 8 figure 30. quiescent current vs. power supply r l = 8 figure 31. noise floor, inputs ac grounded with 1 f v p = 3.6 v figure 32. noise floor, inputs ac grounded with 1 f v p = 5 v
ncp2820 series http://onsemi.com 13 8 2.5 3.5 4.5 5.5 power supply (v) turn off time (ms) t a = +85 c 6 7 8 9 10 11 2.5 3.5 4.5 5.5 figure 33. turn on time figure 34. turn off time power supply (v) turn on time (ms) t a = +85 c t a = +25 c t a = -40 c 7 6 5 4 t a = -40 c t a = +25 c description information detailed description the basic structure of the ncp2820 is composed of one analog pre-amplifier, a pulse width modulator and an h-bridge cmos power stage. the first stage is externally configurable with gain-setting resistor r i and the internal fixed feedback resistor r f (the closed-loop gain is fixed by the ratios of these resistors) and the other stage is fixed. the load is driven differentially through two output stages. the differential pwm output signal is a digital image of the analog audio input signal. the human ear is a band pass filter regarding acoustic waveforms, the typical values of which are 20 hz and 20 khz. thus, the user will hear only the amplified audio input signal within the frequency range. the switching frequency and its harmonics are fully filtered. the inductive parasitic element of the loudspeaker helps to guarantee a superior distortion value. power amplifier the output pmos and nmos transistors of the amplifier have been designed to deliver the output power of the specifications without clipping. the channel resistance (r on ) of the nmos and pmos transistors is typically 0.4 . turn on and turn off transitions in the 9 pin flip-chip package (ncp2820) in order to eliminate pop and click noises during transition, the output power in the load must not be established or cutoff suddenly. when a logic high is applied to the shutdown pin, the internal biasing voltage rises quickly and, 4 ms later, once the output dc level is around the common mode voltage, the gain is established slowly (5.0 ms). this method to turn on the device is optimized in terms of rejection of pop and click noises. thus, the total turn on time to get full power to the load is 9 ms (typical). the device has the same behavior when it is turned-off by a logic low on the shutdown pin. no power is delivered to the load 5 ms after a falling edge on the shutdown pin. due to the fast turn on and off times, the shutdown signal can be used as a mute signal as well. turn on and turn off transitions in the 9 pin flip-chip package (ncp2820) in the case of the ncp2820a, the sequences are the same as the ncp2820. only the timing is different with 1 ms for the turn on and 500 s for the turn off sequence. turn on and turn off transitions in the udfn8 in the case of the udfn8 package, the audio signal is established instantaneously after the rising edge on the shutdown pin. the audio is also suddenly cut once a low level is sent to the amplifier. this way to turn on and off the device in a very fast way also prevents from pop & click noise. shutdown function the device enters shutdown mode when the shutdown signal is low. during the shutdown mode, the dc quiescent current of the circuit does not exceed 1.5 a. current breaker circuit the maximum output power of the circuit corresponds to an average current in the load of 820 ma. in order to limit the excessive power dissipation in the load if a short-circuit occurs, a current breaker cell shuts down the output stage. the current in the four output mos transistors are real-time controlled, and if one current exceeds the threshold set to 1.5 a, the mos transistor is opened and the current is reduced to zero. as soon as the short-circuit is removed, the circuit is able to deliver the expected output power. this patented structure protects the ncp2820. since it completely turns off the load, it minimizes the risk of the chip overheating which could occur if a soft current limiting circuit was used.
ncp2820 series http://onsemi.com 14 application information ncp2820 pwm modulation scheme the ncp2820 uses a pwm modulation scheme with each output switching from 0 to the supply voltage. if v in = 0 v outputs outm and outp are in phase and no current is flowing through the dif ferential load. when a positive signal is applied, outp duty cycle is greater than 50% and outm is less than 50%. with this configuration, the current through the load is 0 a most of the switching period and thus power losses in the load are lowered. figure 35. output voltage and current waveforms into an inductive loudspeaker dc output positive voltage configuration outp outm load current +vp 0 v -vp 0 a voltage gain the first stage is an analog amplifier. the second stage is a comparator: the output of the first stage is compared with a periodic ramp signal. the output comparator gives a pulse width modulation signal (pwm). the third and last stage is the direct conversion of the pwm signal with mos transistors h-bridge into a powerful output signal with low impedance capability. with an 8 load, the total gain of the device is typically set to: 300k r i input capacitor selection (c in ) the input coupling capacitor blocks the dc voltage at the amplifier input terminal. this capacitor creates a high-pass filter with r in , the cut-off frequency is given by fc 1 2 r i c i . when using an input resistor set to 150 k , the gain configuration is 2 v/v. in such a case, the input capacitor selection can be from 10 nf to 1 f with cutoff frequency values between 1 hz and 100 hz. the ncp2820 also includes a built in low pass filtering function. it's cut off frequency is set to 20 khz. optional output filter this filter is optional due to the capability of the speaker to filter by itself the high frequency signal. nevertheless, the high frequency is not audible and filtered by the human ear. an optional filter can be used for filtering high frequency signal before the speaker. in this case, the circuit consists of two inductors (15 h) and two capacitors (2.2 f) (figure 36). the size of the inductors is linked to the output power requested by the application. a simplified version of this filter requires a 1 f capacitor in parallel with the load, instead of two 2.2 f connected to ground (figure 37). cellular phones and portable electronic devices are great applications for filterless class-d as the track length between the amplifier and the speaker is short, thus, there is usually no need for an emi filter. however, to lower radiated emissions as much as possible when used in filterless mode, a ferrite filter can often be used. select a ferrite bead with the high impedance ar ound 100 mhz and a very low dcr value in the audio frequency range is the best choice. the mpz1608s221a1 from tdk is a good choice. the package size is 0603. optimum equivalent capacitance at output stage if the optional filter described in the above section isn't selected. cellular phones and wireless portable devices design normally put several radio frequency filtering capacitors and esd protection devices between filter less class d outputs and loudspeaker. those devices are usually connected between amplifier output and ground. in order to achieve the best sound quality, the optimum value of total equivalent capacitance between each output terminal to the ground should be less than or equal to 150 pf. this total equivalent capacitance consists of the radio frequency filtering capacitors and esd protection device equivalent parasitic capacitance.
ncp2820 series http://onsemi.com 15 outm outp r l = 8 2.2 f 2.2 f 15 h 15 h outm outp r l = 8 1.0 f 15 h 15 h figure 36. advanced optional audio output filter figure 37. optional audio output filter outm outp r l = 8 figure 38. optional emi ferrite bead filter ferrite chip beads figure 39. ncp2820 application schematic with fully differential input configuration figure 40. ncp2820 application schematic with fully differential input configuration and ferrite chip beads as an output emi filter outm outp cs gnd r i sd inp inm vp input from microcontroller differential audio input from dac r i outm outp cs gnd r i sd inp inm vp input from microcontroller differential audio input from dac r i ferrite chip beads
ncp2820 series http://onsemi.com 16 figure 41. ncp2820 application schematic with differential input configuration and high pass filtering function outm outp cs gnd r i sd inp inm vp input from microcontroller differential audio input from dac r i ferrite chip beads c i c i outm outp cs gnd r i sd inp inm vp input from microcontroller single-ended audio input from dac r i c i c i figure 42. ncp2820 application schematic with single ended input configuration
ncp2820 series http://onsemi.com 17 figure 43. schematic of the demonstration board of the 9-pin flip chip csp device j7 c1 100 nf j8 c2 100 nf j2 r1 150 k r2 150 k u1 j1 v p v p c4* 4.7 f c3* b1, b2 a2, b3 outm outp r l = 8 gnd j4 j5 j5 j3 j6* v p c l = ncp2820 on c l = ncp2820 off sd c2 data processor r f inm r f inp shutdown control ramp generator 300 k cmos output stage a3 c3 a1 c1 *j6 not mounted *c3 not mounted in case of 9 pin flip-chip evaluation board *c4 not defined in case of udfn8 evaluation board. figure 44. silkscreen layer of the 9 pin flip-chip evaluation board
ncp2820 series http://onsemi.com 18 figure 45. silkscreen layer of the udfn8 evaluation board pcb layout information ncp2820 is suitable for low cost solution. in a very small package it gives all the advantages of a class-d audio amplifier. the r equired application board is focused on low cost solution too. due to its fully differential capability, the audio signal can only be provided by an input resistor. if a low pass filtering function is required, then an input coupling capacitor is needed. the values of these components determine the voltage gain and the bandwidth frequency. the battery positive supply voltage requires a good decoupling capacitor versus the expected distortion. when the board is using ground and power planes with at least 4 layers, a single 4.7 f filtering ceramic capacitor on the bottom face will give optimized performance. a 1.0 f low esr ceramic capacitor can also be used with slightly degraded performances on the thd+n from 0.06% up to 0.2%. in a two layers application, if both v p pins are connected on the top layer, a single 4.7 f decoupling capacitor will optimize the thd+n level. the ncp2820 power audio amplifier can operate from 2.5 v until 5.5 v power supply. with less than 2% thd+n, it delivers 500 mw rms output power to a 8.0 load at v p =3.0 v and 1.0 w rms output power at v p = 4.0 v.
ncp2820 series http://onsemi.com 19 figure 46. top layer of two layers board dedicated to the 9-pin flip-chip package note: this track between vp pins is only needed when a 2 layers board is used. in case of a typical 4 or more layers, the use of laser vias in pad will optimize the thd+n floor. the demonstration board delivered by on semiconductor is a 4 layers with top, ground, power supply and bottom. note bill of materials item part description ref pcb footprint manufacturer part number 1 ncp2820 audio amplifier u1 ncp2820 2 smd resistor 150 k r1, r2 0603 vishay-draloric crcw0603 3 ceramic capacitor 100 nf, 50 v, x7r c1, c2 0603 tdk c1608x7r1h104kt 4 ceramic capacitor 4.7 f, 6.3 v, x5r c3, c4 0603 tdk c1608x5r0j475mt 5 pcb footprint j7, j8 6 i/o connector. it can be plugged by mc-1,5/3-st-3,81 j2 phoenix contact mc-1,5/3-g 7 i/o connector. it can be plugged by blz5.08/2 (weidmuller reference) j1, j3 weidmuller sl5.08/2/90b 8 jumper connector, 400 mils j4 harwin d3082-b01 9 jumper header vertical mount 3*1, 2.54 mm. j5 tyco electronics / amp 5-826629-0
ncp2820 series http://onsemi.com 20 ordering information device marking package shipping ? NCP2820FCT1 maq 9-pin flip-chip csp 3000 / tape & reel NCP2820FCT1g maq 9-pin flip-chip csp (pb-free) 3000 / tape & reel t1 orientation ncp2820fct2g maq 9-pin flip-chip csp (pb-free) 3000 / tape & reel t2 orientation ncp2820afct2g mbd 9-pin flip-chip csp (pb-free) 3000 / tape & reel t2 orientation ncp2820mutbg zbm 8 pin udfn 2x2.2 (pb-free) 3000 / tape & reel ?for information on tape and reel specifications, including part orientation and tape sizes, please refer to our tape and reel packaging specifications brochure, brd8011/d. die orientation in tape with bumps down die orientation in tape with bumps down pin 1 (upper right) pin 1 (upper left) t1 orientation t2 orientation
ncp2820 series http://onsemi.com 21 package dimensions 9 pin flip-chip case 499al-01 issue o dim min max millimeters a 0.540 0.660 a1 0.210 0.270 a2 notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: millimeters. 3. coplanarity applies to spherical crowns of solder balls. e d -a- -b- 0.10 c a2 a a1 -c- 0.05 c 0.10 c 4 x seating plane d1 e e1 e 0.05 c 0.03 c a b 9 x b c b a 12 3 d 1.450 bsc e 0.330 0.390 b 0.290 0.340 e 0.500 bsc d1 1.000 bsc e1 1.000 bsc 1.450 bsc side view top view bottom view
ncp2820 series http://onsemi.com 22 package dimensions 8 pin udfn, 2x2.2, 0.5p case 506av-01 issue b notes: 1. dimensioning and tolerancing per asme y14.5m, 1994. 2. controlling dimension: millimeters. 3. dimension b applies to plated terminal and is measured between 0.25 and 0.30 mm from terminal. 4. coplanarity applies to the exposed pad as well as the terminals. a b e d d2 e2 bottom view b e 8x 0.10 b 0.05 a c c k 8x note 3 2x 0.10 c pin one reference top view 2x 0.10 c 8x a a1 (a3) 0.08 c 0.10 c c seating plane side view l 8x 1 4 5 8 dim min nom max millimeters a 0.45 0.50 0.55 a1 0.00 0.03 0.05 a3 0.127 ref b 0.20 0.25 0.30 d 2.00 bsc d2 1.40 1.50 1.60 e 2.20 bsc e2 0.70 0.80 0.90 e 0.50 bsc k 0.20 --- --- l 0.35 0.40 0.45 ?? ?? ?? ?? ?? ?? ??? ??? ??? ??? ??? ??? 1 0.25 0.50 pitch 2.15 8x dimensions: millimeters *for additional information on our pb-free strategy and soldering details, please download the on semiconductor soldering and mounting techniques reference manual, solderrm/d. soldering footprint* on semiconductor and are registered trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to mak e changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for an y particular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including wi thout limitation special, consequential or incidental damages. typical parameters which may be provided in scillc data sheets and/or specifications can and do vary in different application s and actual performance may vary over time. all operating parameters, including typicals must be validated for each customer application by customer's technical experts. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the scillc product could create a sit uation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indemnify and hold scillc and its of ficers, employees, subsidiaries, af filiates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, direct ly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that scillc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employer. this literature is subject to all applicable copyright laws and is not for resale in any manner. ncp2820/d publication ordering information n. american technical support : 800-282-9855 toll free ?usa/canada europe, middle east and africa technical support: ?phone: 421 33 790 2910 japan customer focus center ?phone: 81-3-5773-3850 literature fulfillment : ?literature distribution center for on semiconductor ?p.o. box 5163, denver, colorado 80217 usa ? phone : 303-675-2175 or 800-344-3860 toll free usa/canada ? fax : 303-675-2176 or 800-344-3867 toll free usa/canada ? email : orderlit@onsemi.com on semiconductor website : www.onsemi.com order literature : http://www.onsemi.com/orderlit for additional information, please contact your local sales representative

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