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PAM8403H document number: dsxxxxx rev. 1 - 0 1 of 11 www.diodes.com november 2012 ? diodes incorporated PAM8403H a product line o f diodes incorporated filterless 3w class-d stereo audio amplifier description the PAM8403H is a 3w, class-d audio amplifier. it offers low thd+n, allowing it to achieve high quality sound reproduction. the new filterless architecture allows the de vice to drive the speaker directly, requiring no low-pass output filters, thus saving system cost and pcb area. with the same numbers of external components, the efficiency of the PAM8403H is much better than that of class-ab cousins. it can extend the battery life, ideal for portable applications. the PAM8403H is available in sop-16 package. features ? 3w output at 10% thd with a 4 load and 5v power supply ? filterless, low quiescent current and low emi ? low thd+n ? superior low noise ? efficiency up to 90% ? short circuit protection ? thermal shutdown ? few external components to save the ? space and cost ? pb-free package applications ? lcd monitors / tv projectors ? notebook computers ? portable speakers ? portable dvd players, game machines ? cellular phones/speaker phones pin assignments
PAM8403H document number: dsxxxxx rev. 1 - 0 2 of 11 www.diodes.com november 2012 ? diodes incorporated PAM8403H a product line o f diodes incorporated typical applications circuit pin descriptions pin number pin name function 1 -out_l left channel negative output 2 pgnd power gnd 3 +out_l left channel positive output 4 pvdd power v dd 5 mute mute control input active low 6 vdd analog v dd 7 inl left channel input 8 vref internal analog reference, connect a bypass capacitor from vref to gnd 9 nc no connected 10 inr right channel input 11 gnd analog gnd 12 shdn shutdown control input (active low) 13 pvdd power v dd 14 +out_r right channel positive output 15 pgnd power gnd 16 -out_r right channel negative output
PAM8403H document number: dsxxxxx rev. 1 - 0 3 of 11 www.diodes.com november 2012 ? diodes incorporated PAM8403H a product line o f diodes incorporated functional block diagram absolute maximum ratings (@t a = +25c, unless otherwise specified.) these are stress ratings only and functional operation is not implied. exposure to absolute maximum ratings for prolonged time periods may affect device reliability. all voltages are with respect to ground. parameter rating unit supply voltage range 6.0 v input voltage -0.3 to v dd +0.3 operation temperature range -40 to +85 c maximum junction temperature 150 operation junction temperature -40 to +125 storage temperature -65 to 150 soldering temperature 300, 5sec recommended operating conditions (@t a = +25c, unless otherwise specified.) parameter rating unit supply voltage range 2.5 to 5.5 v operation temperature range -40 to +85 c junction temperature range -40 to +125 c
PAM8403H document number: dsxxxxx rev. 1 - 0 4 of 11 www.diodes.com november 2012 ? diodes incorporated PAM8403H a product line o f diodes incorporated thermal information parameter package symbol max unit thermal resistance (junction to ambient) sop-16 ja 110 c/w thermal resistance (junction to case) sop-16 jc 23 internal power dissipation (@ t a = +25c) sop-16 p d 90 mw note: 1. the maximun output current for sot23-5 package is limit ed by internal power dissipation capacity as described in application information here inafter. electrical characteristics (@t a = +25c, v dd = 5v, gain = 24db, r l = 8 ? , unless otherwise specified.) symbol parameter test conditions min typ max units v in supply voltage 2.5 5.5 v p o output power thd+n = 10%,f = 1khz , r l = 4 ? v dd = 5.0v 2.85 3.20 w thd+n =1%, f = 1khz, r l = 4 ? v dd = 5.0v 2.25 2.50 w thd+n =10%,f = 1khz, r l = 8 ? v dd = 5.0v 1.5 1.8 w thd+n = 1%, f = 1khz, r l = 8 ? v dd = 5.0v 1.2 1.4 w thd+n total harmonic distortion plus noise v dd = 5.0v,p o = 0.5w, r l = 8 ? f = 1khz 0.15 0.20 % v dd = 5.0v, p o = 1w, r l = 4 ? f = 1khz 0.15 0.20 % g v gain 23 24 25 db psrr power supply ripple rejection v dd = 5.0v, inputs ac-grounded with c in = 0.47 f f = 100hz -59 -50 db f = 1khz -58 -50 db c s crosstalk v dd = 5v, p o = 0.5w, r l = 8 ? , g v = 20db f = 1khz -95 -80 db snr signal-to-noise ration v dd = 5v, v orms = 1v,g v = 20db f = 1khz 74 80 db v n output noise v dd = 5v, inputs ac-grounded with c in = 0.47 f a-weighting 100 200 no a-weighting 150 300 v i q quiescent current v dd = 5.0v no load 16 20 ma i mute muting current v dd = 5.0v v mute = 0.3v 8 12 ma i sd shutdown current v dd = 2.5v to 5.5v v sd = 0.3v 20 a v os output offset voltage v in = 0v, v dd = 5v 10 mv v ih enable input high voltage v dd = 5.0v 1.5 v v il enable input lowvoltage v dd = 5.0v 0.4 v v ih mute input high voltage v dd = 5.0v 1.5 v v il mute input low voltage v dd = 5.0v 0.4 v
PAM8403H document number: dsxxxxx rev. 1 - 0 5 of 11 www.diodes.com november 2012 ? diodes incorporated PAM8403H a product line o f diodes incorporated typical performance characteristics (@t a = +25c, unless otherwise specified.)
PAM8403H document number: dsxxxxx rev. 1 - 0 6 of 11 www.diodes.com november 2012 ? diodes incorporated PAM8403H a product line o f diodes incorporated typical performance characteristics (cont.) (@t a = +25c, unless otherwise specified.)
PAM8403H document number: dsxxxxx rev. 1 - 0 7 of 11 www.diodes.com november 2012 ? diodes incorporated PAM8403H a product line o f diodes incorporated application information 1. when the PAM8403H works with lc filters, it should be connecte d with the speaker before it's powered on, otherwise it will b e damaged easily. 2. when the PAM8403H works without lc filters, it's better to add a ferrite chip bead at the outgoing line of speaker for suppr essing the possible electromagnetic interference. 3. the recommended operating voltage is 5.5v. when the PAM8403H is powered with four battery cells, it should be noted that the voltage of four new dry or alkaline batteries is over 6.0v, higher than its operation voltage, which will probably damage the device. therefore, it's recommended to use either four ni-mh (nickel metal hydr ide) rechargeable batteries or th ree dry or alkaline batteries. 4. one should not make the input signal too large. large signal can cause the clipping of output signal when increasing the vol ume. this will damage the device because of the big gain of the PAM8403H. 5. when testing the PAM8403H without lc filters by using resistor instead of speaker as the output load, the test results, e.g. thd or efficiency, will be worse than those of using speaker as load. test setup for performance testing notes: 1. the audio precision(ap) aux-0025 low pass filter is necessary for class-d amplifier measurement with ap analyzer. 2. two 22 h inductors are used in series with load resistor to emulate the small speaker for efficiency measurement. maximum gain as shown in block diagram (page 2), the PAM8403H has two inter nal amplifier stages. the first stage's gain is externally config urable, while the second stage's is internally fixed. the closed-loop gain of the fi rst stage is set by selecting the ratio of rf to ri while the second stage's gain is fixed at 2x.the output of amplifier 1 serves as the input to amplifier 2, thus the two amplifiers produce signals identical in magnitude, but different in phase by 180. consequently, the differential gain for the ic is a vd = 20*log [2*(r f /r i )] the PAM8403H sets maximum r f = 142k, minimum r i = 18k, so the maximum closed-gain is 24db. mute operation the mute pin is an input for controlling the output state of t he PAM8403H. a logic low on this pin disables the outputs, and a logic high on this pin enables the outputs. this pin may be us ed as a quick disable or enable of the outputs without a volume fade. quiescent curr ent is listed in the electrical characteristic t able. the mute pin can be left floating due to the internal pull-up. shutdown operation in order to reduce power consumption while not in use, the PAM8403H contains shutdown circuitry to turn off the amplifier's bia s circuitry. this shutdown feature turns the amplifier off when logic low is applie d to the shdn pin. by switching the shdn pin connected to gnd, the PAM8403H supply current draw will be minimized in idle mode. th e shdn pin can be left floating due to the internal pull-up.
PAM8403H document number: dsxxxxx rev. 1 - 0 8 of 11 www.diodes.com november 2012 ? diodes incorporated PAM8403H a product line o f diodes incorporated application information (cont.) power supply decoupling the PAM8403H is a high performance cmos audio amplifier that requires adequate power supply decoupling to ensure the output thd and psrr as low as possible. power supply decoupling affects low fr equency response. optimum decoupling is achieved by using two ca pacitors of different types targeting to different types of noise on the power supply leads. for higher frequency transients, spikes, or di gital hash on the line, a good low equivalent-seriesresistance ( esr) ceramic capacitor, typically 1.0 f, works best, placing it as cl ose as possible to the device v dd terminal. for filtering lowerfrequency noise signals, a large capacitor of 20 f (ceramic) or greater is recomm ended, placing it near the audio power amplifier. input capacitor (c i ) large input capacitors are both expensive and space hungry for portable des igns. clearly, a certain sized capacitor is needed t o couple in low frequencies without severe attenuation. but in many cases the speakers used in portable systems, whether internal or external, have little ability to reproduce signals below 100hz to 150hz. thus, using a large input capacitor may not increase actual system performance. in t his case, input capacitor (c i ) and input resistance (r i ) of the amplifier form a high-pass filter with the corner frequency determined by equation below, c r2 1 f i i c 3 in addition to system cost and size, click and pop performance is affected by the size of the input coupling capacitor, c i . a larger input coupling capacitor requires more charge to reach its quiescent dc voltage (nominally 1/2 v dd ). this charge comes from the internal circuit via the feedback and is apt to create pops upon device enable. thus, by mi nimizing the capacitor size ba sed on necessary low frequency response, turn-on pops can be minimized. analog reference bypass capacitor (c byp ) the analog reference bypass capacitor (c byp ) is the most critical capacitor and serves severa l important functions. during start-up or recovery from shutdown mode, c byp determines the rate at which the amplifier starts up. the second function is to reduc e noise caused by the power supply coupling into the output drive signal. this noise is from the internal analog reference to the amplifier, which appears as degraded psrr and thd+n. a ceramic bypass capacitor (cbyp) with values of 0.47 f to 1.0 f is recommended for the best thd and noise performance. increasing the bypass capacitor reduces clicking and popping noise from power on/off and entering and leaving shutdown. under voltage lock-out (uvlo) the PAM8403H incorporates circuitry designed to detect low supply voltage. when the suppl y voltage drops to 2.0v or below, the PAM8403H outputs are disabled, and the device comes out of this state and starts to normal function when v dd 2.2v. short circuit protection (scp) the PAM8403H has short circuit prot ection circuitry on the outputs to prevent da mage to the device when output-to-output or out put-to-gnd short occurs. when a short circuit is detected on the outputs, t he outputs are disabled immediately. if the short was removed, the device activates again. over temperature protection thermal protection on the PAM8403H prevents the device from damage when the internal die temperature exceeds 140c. there is a degree tolerance on this trip point from device to device. once t he die temperature exceeds the thermal set point, the device outputs are disabled. this is not a latched fault. the thermal fault is cleared once the temper ature of the die is reduced by 30c. this large hystereis w ill prevent motor boating sound well and the device begins normal operation at this point without extrenal system intervention.
PAM8403H document number: dsxxxxx rev. 1 - 0 9 of 11 www.diodes.com november 2012 ? diodes incorporated PAM8403H a product line o f diodes incorporated application information (cont.) how to reduce emi (electro magnetic interference) a simple solution is to put an additional capacitor 1000f at po wer supply terminal for power li ne coupling if the traces from amplifier to speakers are short (<20cm). most applications require a ferrite bead filter as shown in figur e 2. the ferrite filter reduces emi of around 1mhz and higher. when selecting a ferrite bead, choose one with high impedance at high frequencies, and low impedance at low frequencies. figure 2. ferrite bead filter to reduce emi ordering information part number part marking package type standard package pam8403dr-h pam8403 xxxywwll sop-16 2500 units/tape&reel
PAM8403H document number: dsxxxxx rev. 1 - 0 10 of 11 www.diodes.com november 2012 ? diodes incorporated PAM8403H a product line o f diodes incorporated marking information package outline dimensions (all dimensions in mm.) sop-16
PAM8403H document number: dsxxxxx rev. 1 - 0 11 of 11 www.diodes.com november 2012 ? diodes incorporated PAM8403H a product line o f diodes incorporated important notice diodes incorporated makes no warranty of any kind, express or implied, with regards to this document, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose (and their equivalents under the laws of any jurisdiction). diodes incorporated and its subsidiaries rese rve the right to make modifications, enhanc ements, improvements, corrections or ot her changes without further notice to this document and any product descri bed herein. diodes incorporated does not assume any liability arising out of the application or use of this document or an y product described herein; neither does di odes incorporated convey any license under its patent or trademark rights, nor the rights of others. any customer or us er of this document or products described herein in such applica tions shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on diodes incorporated website, harmless against all damages. diodes incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthoriz ed sales channel. should customers purchase or use diodes inco rporated products for any unintended or una uthorized application, customers shall i ndemnify and hold diodes incorporated and its representativ es harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death a ssociated with such unintended or unauthorized application. products described herein may be covered by one or more united states, international or foreign patents pending. product names and markings noted herein may also be covered by one or more united states, international or foreign trademarks. this document is written in english but may be translated into multiple languages for reference. only the english version of t his document is the final and determinative format released by diodes incorporated. life support diodes incorporated products are specifically not authorized for use as critical component s in life support devices or systems without the express written approval of the chief executive offi cer of diodes incorporated. as used herein: a. life support devices or syst ems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when proper ly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. b. a critical component is any component in a life support devic e or system whose failure to perform can be reasonably expect ed to cause the failure of the life support device or to affect its safety or effectiveness. customers represent that they have all necessary expertise in the safety and regulatory ramifi cations of their life support dev ices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-rel ated requirements concerning the ir products and any use of diodes incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or s ystems-related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporate d and its representatives against any damages arisi ng out of the use of diodes incorporated pr oducts in such safety-critical, life suppor t devices or systems. copyright ? 2012, diodes incorporated www.diodes.com

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