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| 1/30 www.rohm.com 2010.02 - rev. a ? 2010 rohm co., ltd. all rights reserved. high performance class-d speaker / headphone amplifier series 20w+20w class-d speaker amplifier for digital input BD5446EFV overview BD5446EFV is a class d speaker amplifier designed for fl at-panel tvs in particular for space-saving and low-power consumption, delivers an output powe r of 20w+20w. this ic employs state-of-the-art bipolar, cmos, and dmos (bcd) process technology that eliminates turn-on resistance in t he output power stage and internal loss due to line resistances up to an ultimate level. with this technology, the ic can achieve high efficiency of 87% (10w+10w output with 8 ? load). in addition, the ic is packaged in a compact reverse heat radi ation type power package to achieve low power consumption and low heat generation and eliminates nec essity of external heat-sink up to a total output power of 40w. this product satisfies both needs for drastic downsizing, low-profile structures and many function, high quality playback of sound system. features 1) BD5446EFV has two system of digital audio interface . (i 2 s/lj format, sdata: 16 / 20 / 24bit, lrclk: 32khz / 44.1k hz / 48khz, bclk: 64fs (fixed), sys_clk: 256fs (fixed)) 2) within the wide range of the power supply voltage, it is possible to operate in a single power supply. (10~26v) 3) it contributes to miniaturizing, making to the thin ty pe, and the power saving of the system by high efficiency and low hea t. 4) s/n of the system can be optimized by adjusti ng the gain setting among 8 steps. (20~34db / 2db step) 5) it has the output power limitation function th at can be adjusted to an arbitrary output power. 6) the decrease in sound quality bec ause of the change of the power supply voltage is prevented with the feedback circuitry of the output. in addition, a low noise and low distortion are achieved. 7) it provides with the best stereo dac output for the headpho ne usage. as a result, the out put of the selection of the digital input in two systems is possible. 8) eliminates pop noise generated when the power supply goe s on/off, or when the power supply is suddenly shut off. high quality muting performance is realized by using the soft-muting technology. 9) BD5446EFV is a highly reliable design to which it has various protection functions. (high temperature protection, under voltage protection, output short prot ection, output dc voltage protection and clock stop protection) applications flat panel tvs (lcd, plasma), home audio, desktop pc, amusement equipments, electronic music equipments, etc., no.10075eat14
technical note 2/30 BD5446EFV www.rohm.com 2010.02 - rev. a ? 2010 rohm co., ltd. all rights reserved. absolute maximum ratings (ta=25 ) item symbol limit unit conditions supply voltage v cc 30 v pin 25, 28, 29, 53, 54 *1 *2 power dissipation p d 2.0 w *3 4.5 w *4 6.2 w *5 input voltage v in -0.3 ~ 4.5 v pin 7 ~ 18, 21 *1 open-drain terminal voltage v err -0.3 ~ 30 v pin24 *1 operating temperature range t opr -25 ~ +85 * * * * * operating conditions (ta=25 ) item symbol limit unit conditions supply voltage v cc 10 ~ 26 v pin 25, 28, 29, 53, 54 *1 *2 minimum load impedance (speaker output) r l_sp 5.4 *6 minimum load impedance (dac output) r l_da 20 k pin 22, 23 *6 do not, however exceed pd. * no radiation-proof design. technical note 3/30 BD5446EFV www.rohm.com 2010.02 - rev. a ? 2010 rohm co., ltd. all rights reserved. electrical characteristics (unless otherwise specified ta=25 ? ? technical note 4/30 BD5446EFV www.rohm.com 2010.02 - rev. a ? 2010 rohm co., ltd. all rights reserved. electrical characteristic curves (v cc =13v,ta=25 ? ? measured by rohm designed 4 layer board. :? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:?:? :? :?:? :?:?:?:? :?:?:?:?:?:? :?:?:?:?:?:? :?:? vcc(v) icc(ma) :? :? :? :? :? :? :?:? :?:? :?:? :?:? :?:? :?:? :?:? total output power(w) icc(a) :? :? :? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :? :?:? :?:?:?:?:?:? :?:?:?:?:?:?:?:? :?:?:?:? vcc(v) output power(w/ch) fig.1 fig.2 fig.3 fig.4 fig.5 fig.6 fig.7 fig.8 fig.9 fig.10 fig.11 fig.12 current consumption - power su pp l y volta g e output power - power supply voltage current consumption - out p ut p owe r efficiency - output power voltage gain - frequency fft of output noise voltage thd+n - output power thd+n - frequency crosstalk - output power crosstalk ?frequency wave form when releasing soft-mute wave form when activating soft-mute technical note 5/30 BD5446EFV www.rohm.com 2010.02 - rev. a ? 2010 rohm co., ltd. all rights reserved. electrical characteristic curves (v cc =18v,ta=25 ? ? measured by rohm designed 4layer board. fig.13 fig.14 fig.15 fig.16 fig.17 fig.18 fig.19 efficiency ? output power voltage gain - frequency fft of output noise voltage thd+n - output power thd+n - frequency technical note 6/30 BD5446EFV www.rohm.com 2010.02 - rev. a ? 2010 rohm co., ltd. all rights reserved. pin configuration and block diagram 40 39 38 37 36 35 34 33 32 31 30 29 48 47 46 45 44 43 42 41 28 3 4 5 6 7 8 9 14 15 16 17 18 19 20 21 10 11 12 13 22 23 24 51 50 49 54 53 52 27 26 25 i 2 s/lj interface gain selector pwm modulator 8 over sampling digital filter control interface test dac selector high temperature protection under voltage protection clock stop protection output short protection output dc voltage protection 1 2 vcca nc reg_g2 fila power limiter gnda dac reg_3 reg_g1 driver 1p driver 1n gndp1 reg_g1 reg_g1 vccp1 nc nc nc driver 2p driver 2n gndp2 reg_g2 reg_g2 vccp2 nc nc nc nc i 2 s/lj selector filp technical note 7/30 BD5446EFV www.rohm.com 2010.02 - rev. a ? 2010 rohm co., ltd. all rights reserved. pin function explanation (provided pin voltages are typ. values) no. pin name pin voltage pin explanation internal equivalence circuit 1 27 reg_g1 reg_g2 5.5v internal power supply pin for ch1 gate driver internal power supply pin for ch2 gate driver please connect the capacitor. 2 filp 1.75v~2.55v bias pin for pwm signal please connect the capacitor. 3 plmt 0v power limiter setting terminal 4 fila 2.5v bias pin for analog signal please connect the capacitor. 5 reg3 3.3v internal power supply pin for digital circuit please connect the capacitor. 6 gnda 0v gnd pin for analog signal 25 2 6 400k 25 3 6 27 4 6 50k 50k 25 5 6 500k 1 27 550k 53,54 28,29 45,46 36,37 technical note 8/30 BD5446EFV www.rohm.com 2010.02 - rev. a ? 2010 rohm co., ltd. all rights reserved. no. pin name pin voltage pin explanation internal equivalence circuit 7 8 9 10 11 sys_clk bclk lrclk sdata1 sdata2 0v digital audio signal input pin 12 resetx 0v reset pin for digital circuit h: reset off l: reset on 13 mutex speaker output mute control pin h: mute off l: mute on 14 pdx power down control pin h: power down off l: power down on 15 iis_lj 0v digital audio signal data format setting terminal h: left justified format l: i 2 s format 16 17 18 gain1 gain2 gain3 0v gain setting terminal gain=20db~34db, 2db step 19 20 test1 test2 0v test pin please connect to gnd. 21 sel_dac 0v dac output selection terminal h: sdata2 is output from the dac l: sdata1 is output from the dac 5 7,8,9 10,11 6 50k 5 12,13,14 6 50k 5 6 15 50k 5 16,17,18 6 50k 5 19,20 6 50k 5 6 21 50k technical note 9/30 BD5446EFV www.rohm.com 2010.02 - rev. a ? 2010 rohm co., ltd. all rights reserved. no. pin name pin voltage pin explanation internal equivalence circuit 22 23 out_dac2 out_dac1 2.5v ch2 dac output pin ch1 dac output pin please connect it with the latter part circuit through the capacitor. 24 error 3.3v error flag pin please connect pull-up resistor. h: while normal l: while error 25 vcca vcc power supply pin for analog signal 500 25 24 6 25 6 22,23 50k technical note 10/30 BD5446EFV www.rohm.com 2010.02 - rev. a ? 2010 rohm co., ltd. all rights reserved. no. pin name pin voltage pin explanation internal equivalence circuit 28,29 vccp2 vcc power supply pin for ch2 pwm signal 31,32 out2p vcc~0v output pin of ch2 positive pwm please connect to output lpf. 33 bsp2p 28,29 33 40 31,32 38,39 36,37 53,54 42 49 43,44 50,51 45,46 technical note 11/30 BD5446EFV www.rohm.com 2010.02 - rev. a ? 2010 rohm co., ltd. all rights reserved. gain1 pin, gain2 pin, gain3 pin function gain3 (18pin) gain2 (17pin) gain1 (16pin) speaker output gain l l l 20db l l h 22db l h l 24db l h h 26db h l l 28db h l h 30db h h l 32db h h h 34db sel_dac pin function sel_dac (21pin) out_dac1 (23pin) out_dac2 (24pin) l the lch signal of sdata1 is output the rch signal of sdata1 is output h the lch signal of sdata2 is output the rch signal of sdata2 is output resetx pin function resetx (10pin) state of digital block l reset on h reset off resetx pin resetx (12pin) state of digital block l reset on h reset off pdx pin,mutex pin function pdx (12pin) mutex (11pin) power down dac output (24,25pin) pwm output (33,34,38,39, 43,44,48pin) l l or h on hiz_low hiz_low h l off normal operation h h normal operation iis_lj pin function iis_lj (15pin) digital data format l i2s h left justified technical note 12/30 BD5446EFV www.rohm.com 2010.02 - rev. a ? 2010 rohm co., ltd. all rights reserved. input digital audio signal sampling frequency (fs) explanation pwm sampling frequency, soft-start, soft-mute time, and the det ection time of the dc voltage protection in the speaker depends on sampling frequency (fs) of the digital audio input. sampling frequency of the digital audio input (fs) pwm sampling frequency (fpwm) soft-start / soft-mute time dc voltage protection in the speaker detection time 32khz 512khz 64msec. 64msec. 44.1khz 705.6khz 46msec. 46msec. 48khz 768khz 43msec. 43msec. for voltage gain (gain setting) BD5446EFV prescribe voltage gain at speak er output (btl output) under the definition 0dbv (1vrms) as full scale input of the digital audio input signal. for example, digital audio input signal = full scale input, gain setting = 20db, load resistanc e r l_sp = 8 ? speaker output and dac output digital audio input signal sdata1 will be output to the speak er. (sdata2 will not be output to the speaker. dac output can be selected either from digital audio input signal sdata1 or sdata2.) format of digital audio input ? ? ? ? technical note 13/30 BD5446EFV www.rohm.com 2010.02 - rev. a ? 2010 rohm co., ltd. all rights reserved. lrclk (sdata2) bclk sdata1 lch rch 32 clocks 32 clocks fig.20 i 2 s data format 64fs, 24 bit data msb 22 21 20 19 18 17 16 15 14 msb 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 13 12 11 10 9 8 7 6 76 3 54 1 2 lsb 3 54 12 lsb msb 18 17 9 8 7 6 5 msb 18 17 16 15 14 13 12 11 10 4321 lsb 16151413121110987654321 lsb msb msb 98765 14 13 12 11 10 4321 lsb 98765 14 13 12 11 10 4321 lsb lrclk (sdata2) bclk sdata1 lch 1/64fs rch 32 clocks 32 clocks fig.23 left-justified data format 64fs, 24 bit data msb 2 2 2 1 2 0 1 9 1 8 1 7 1 6 1 5 1 4 msb 2 2 2 1 2 0 1 9 1 8 1 7 1 6 1 5 1 4 1 3 1 2 1 1 1 0 9 8 1 3 1 2 1 1 1 0 9 8 7 6 76 3 54 1 2 lsb 3 54 12 lsb msb 1 8 1 7 98765 msb 1 8 1 7 1 6 1 5 1 4 1 3 1 2 1 1 1 0 4321 lsb 1 6 1 5 1 4 1 3 1 2 1 1 1 0 987654321 lsb lrclk (sdata2) bclk sdata1 lch rch fig.24 left-justified data format 64fs, 20 bit data msb msb lrclk (sdata2) bclk sdata1 lch rch 98765 1 4 1 3 1 2 1 1 1 0 4321 lsb 98765 1 4 1 3 1 2 1 1 1 0 4321 lsb fig.25 left-justified data format 64fs, 16 bit data i 2 s data format the low section of lrclk becomes lch, th e high section of lrclk becomes rch. after changing lrclk, second bit becomes msb. left-justified format the high section of lrclk becomes lch, the low section of lrclk becomes rch. after changing lrclk, first bit becomes msb. technical note 14/30 BD5446EFV www.rohm.com 2010.02 - rev. a ? 2010 rohm co., ltd. all rights reserved. power supply start-up sequence vccp1 (53, 54pin) vccp2 (28, 29pin) vcca (25pin) reg_g1 (1pin) reg_3 (5pin) pdx (14pin) bclk (8pin) lrclk (9pin) speaker output sdata1 (10pin) sdata2 (11pin) reg_g2 (27pin) power up vcca, vccp1, vccp2 simultaneously. reg_g1, reg_g2 reg_3 degital audio data communication. set pdx to high. set mutex to high. out_dac2 (22pin) out_dac1 (23pin) t t t t t t t mutex (13pin) resetx (12pin) set resetx to high after power up. t sys_clk (7pin) soft-start 43msec(fs=48khz) technical note 15/30 BD5446EFV www.rohm.com 2010.02 - rev. a ? 2010 rohm co., ltd. all rights reserved. power supply shut-down sequence vccp1 (53, 54pin) vccp2 (28, 29pin) vcca (25pin) reg_g1 (1pin) reg_3 (5pin) resetx (12pin) mutex (13pin) pdx (14pin) bclk (8pin) lrclk (9pin) sdata1 (10pin) sdata2 (11pin) reg_g2 (27pin) reg_g1, reg_g2 reg_3 set mutex to low. set pdx to low. stop digital audio date signal. set resetx to low power down vcca, vccp1, vccp2, simultaneously. out_dac2 (22pin) out_dac1 (23pin) t t t t t t t t sys_clk (7pin) soft-mute 43msec(fs=48khz) technical note 16/30 BD5446EFV www.rohm.com 2010.02 - rev. a ? 2010 rohm co., ltd. all rights reserved. about the protection function protection function detecting & releasing condition dac output pwm output error output output short protection detecting condition detecting current = 10a (typ.) normal operation hiz_low (latch) l (latch) dc voltage protection in the speaker detecting condition pwm output duty=0% or 100% 43msec(fs=48khz) above fixed hiz_low (latch) l (latch) high temperature protection detecting condition chip temperature to be above 150 * * technical note 17/30 BD5446EFV www.rohm.com 2010.02 - rev. a ? 2010 rohm co., ltd. all rights reserved. 1) high temperature protection this ic has the high temperature protec tion circuit that prevents thermal reckle ss driving under an abnormal state for the temperature of the chip to exceed tjmax=150 out1p (50, 51pin) temperature of ic chip junction() speaker output out_dac2 (22pin) out_dac1 (23pin) 150 120 hiz-low soft-mute 43msec(fs=48khz) 3.3v error (24pin) out1n (43, 44pin) out2n (38, 39pin) out2p (31, 32pin) t t t t t soft-start 43msec(fs=48khz) technical note 18/30 BD5446EFV www.rohm.com 2010.02 - rev. a ? 2010 rohm co., ltd. all rights reserved. 2) under voltage protection this ic has the under voltage protection circuit that make speaker output mute once detecting extreme drop of the power supply voltage. detecting condition ? it will detect when mute pin is set high and the power supply voltage becomes lower than 8v. the speaker output is muted thr ough a soft-mute when detected. releasing condition ? it will release when mute pin is set high and the power supply voltage becomes more than 9v. the speaker output is outputted th rough a soft-start when released. out1p (50, 51pin) vcca (25pin) speaker output error (24pin) out_dac2 (22pin) out_dac1 (23pin) 9v 8v hiz-low soft-mute 43msec(fs=48khz) 3.3v vccp1 (53, 54pin) vccp2 (28, 29pin) out1n (43, 44pin) out2n (38, 39pin) out2p (31, 32pin) t t t t t soft-start 43msec(fs=48khz) technical note 19/30 BD5446EFV www.rohm.com 2010.02 - rev. a ? 2010 rohm co., ltd. all rights reserved. 3) clock stop protection this ic has the clock stop protection circuit that make t he speaker output mute when the sys_clk signal of the digital audio input stops. detecting condition - it will dete ct when mute pin is set high and the sys_clk signal stops for about 1usec or more. the speaker output is muted thr ough a soft-mute when detected. releasing condition - it will release when mute pin is set high and the sys_clk signal returns to the normal clock operation. the speaker output is outputt ed through a soft-start when released. out1p (50, 51pin) sys_clk (7pin) speaker output error (24pin) out_dac2 (22pin) out_dac1 (23pin) clock stop clock recover hiz-low protection start with about 1sec clock stop. 3.3v unstable out1n (43, 44pin) out2n (38, 39pin) out2p (31, 32pin) t t t t t soft-start 43msec(fs=48khz) technical note 20/30 BD5446EFV www.rohm.com 2010.02 - rev. a ? 2010 rohm co., ltd. all rights reserved. 4)output short protection(s hort to the power supply) this ic has the pwm output short protecti on circuit that stops the pwm output when the pwm output is short-circuited to the power supply due to abnormality. detecting condition - it will detect when mute pin is set high and the current that fl ows in the pwm output pin becomes 10a(typ.) or more. the pwm output in stantaneously enters the state of hiz-low if detected, and ic does the latch. releasing method - error (24pin) mutex(13pin) short to gnd release from short to gnd pwm out ic latches with hiz-low. released from latch state. sec(typ.) t t t out1p (50, 51pin) out1n (43, 44pin) out2n (38, 39pin) out2p (31, 32pin) 10a(typ.) over current t latch release error (24pin) mutex13pin short to vcc release from short to vcc pwm out ic latches with hiz-low. released from latch state. sec(typ.) t t t out1p (50, 51pin) out1n (43, 44pin) out2n (38, 39pin) out2p (31, 32pin) 10a(typ.) over current t latch release technical note 21/30 BD5446EFV www.rohm.com 2010.02 - rev. a ? 2010 rohm co., ltd. all rights reserved. 6) dc voltage protection in the speaker when the dc voltage in the speaker is impressed due to abnorma lity, this ic has the protection circuit where the speaker is defended from destruction. detecting condition - it will detect when mute pin is set high or low and pwm output duty=0% or 100% , 43msec(fs=48khz) or above. once detected, t he pwm output instantaneously enters the state of hiz-low, and ic does the latch. releasing method ? out1p (50, 51pin) speaker output latch release state. error (24pin) out1n (43, 44pin) out2n (38, 39pin) out2p (31, 32pin) t t t soft-start t mutex(13pin) latch release pwm out locked duty=100% abnormal state. abnormal state release. pwm output ic latche with hiz-low. protection start surge current into speaker output for 43msec (fs=48khz) and over. 43msec(fs=48khz) technical note 22/30 BD5446EFV www.rohm.com 2010.02 - rev. a ? 2010 rohm co., ltd. all rights reserved. output power limiter function this ic is provided with an output power limiter function to protect speakers from destruction by an excessive output. limiter values are freely specified by changing external resistors r1/r2 as shown in fig-26. fig-27 shows a speaker output waveform that is generated with use of the output limiter function. be cause the waveform is soft-clipped, unusual noises on audible signals are significantly re duced under operation of limiter. use resistors with a high degree of accuracy for r1 and r2 ( 0 1 2 3 4 5 6 7 8 9 10 1 1.2 1.4 1.6 1.8 2 3 5 1f 1f r2 r1 reg_3 power limiter c gnda 5pin 3.3v technical note 23/30 BD5446EFV www.rohm.com 2010.02 - rev. a ? 2010 rohm co., ltd. all rights reserved. application circuit example(r l_sp =8 ? ) :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :? :? :? :? :? :? :? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? ::?:?:?c ::?: :?:?:?:- :-:a:a ::?:?:::w ::?::?:?:?:a:?:?c>:?:?:a:?:?:? :?:?:::w ::?:?:?::? :a:?:?:?:?:? :a:?:?:?:?:? :? :? :a:?::? :?:?:?:?::?:?:o:? :?:?::? :a:?:?:?:o:?:?: ::?: ::?:?::?:?:?:?: ; :?:w:|::?: :a:?:?:?:?::?:? :?::?::?:?:? :?::?:?:?: :?:?:?:?::?:? :?:?:?:?::?:?:o:? :?:?:a:? :?:?:? :a:?:?:?:o:?:?: :?::?:?:w:?:?:?:?:?::?:?:::?:w:::?:?:?:o:?::?:? :?:?:?:?::w:-:?:?:?:?:?:?:w:::?:?:?:o:?::?:? :?:?:?:o:a:w:a:?:?:?:w:::?:?:?:o:?::?:? :|::?:?::?:w:a:?:?::?:w:::?:?:?:o:?::?:? :|::?:?::?:w:?:?:w:-:?:?:?:?:?:?:w:::?:?:?:o:?::?:? :|:?:?:?:?:?:?:? :? technical note 25/30 BD5446EFV www.rohm.com 2010.02 - rev. a ? 2010 rohm co., ltd. all rights reserved. application circuit example(r l_sp =6 ? ) :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :? :? :? :? :? :? :? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? :?:? ::?:?:?c ::?: :?:?:?:- :-:a:a ::?:?:::w ::?::?:?:?:a:?:?c>:?:?:a:?:?:? :?:?:::w ::?:?:?::? :a:?:?:?:?:? :a:?:?:?:?:? :? :? :a:?::? :?:?:?:?::?:?:o:? :?:?::? :a:?:?:?:o:?:?: ::?: ::?:?::?:?:?:?: ; :?:w:|::?: :a:?:?:?:?::?:? :?::?::?:?:? :?::?:?:?: :?:?:?:?::?:? :?:?:?:?::?:?:o:? :?:?:a:? :?:?:? :a:?:?:?:o:?:?: :?::?:?:w:?:?:?:?:?::?:?:::?:w:::?:?:?:o:?::?:? :?:?:?:?::w:-:?:?:?:?:?:?:w:::?:?:?:o:?::?:? :?:?:?:o:a:w:a:?:?:?:w:::?:?:?:o:?::?:? :|::?:?::?:w:a:?:?::?:w:::?:?:?:o:?::?:? :|::?:?::?:w:?:?:w:-:?:?:?:?:?:?:w:::?:?:?:o:?::?:? :|:?:?:?:?:?:?:? :? technical note 27/30 BD5446EFV www.rohm.com 2010.02 - rev. a ? 2010 rohm co., ltd. all rights reserved. output lc filter circuit an output filter is required to elimin ate radio-frequency components exceeding the audio-frequency region supplied to a load (speaker). because this ic uses sampling clock frequenc ies from 200khz to 400khz in the output pwm signals, the high-frequency components must be appropriately removed. this section takes an example of an lc type lpf shown in fi g.29, in which coil l and capac itor c compose a differential filter with an attenuation propert y of -12db/oct. a large part of switching current s flow to capacitor c, and only a small part of the currents flow to speaker r l . this filter reduces unwanted emission this way. in addition, coil l and capacitor cg compose a filter against in-phase compon ents, reducing unwanted emission further. filter constants depend on load impedances. the following are formulas to calculate values of l, c, and cg when q=0.707 is specified. fig. 29 r l : load impedance ( f c : lpf cut off frequency (hz) following presents output lc filter cons tants with typical load impedances. f c = 30khz f c = 40khz r l l c cg r l l c cg 6 ? ? ? ? ? ? technical note 28/30 BD5446EFV www.rohm.com 2010.02 - rev. a ? 2010 rohm co., ltd. all rights reserved. notes for use 1 ) absolute maximum ratings use of the ic in excess of absolute maximum ratings such as the applied voltage or operating temperature range may result in ic damage. assumptions should not be made r egarding the state of the ic (short mode or open mode) when such damage is suffered. a physical safety measure such as a fuse should be implemented when use of the ic in a special mode where the absolute maximum ratings may be exceeded is anticipated. 2 ) power supply lines as return of current regenerated by bac k emf of output coil happens, take steps such as putting capacitor between power supply and gnd as a electric pathway for the regenerated current. be sure that there is no problem with each property such as emptied capacity at lo wer temperature regarding electrolytic capacitor to decide capacity value. if the connected power supply does not have suff icient current absorption capacity, rege nerative current will cause the voltage on the power supply line to rise, which combined with the product and its peripheral circuitry may exceed the absolute maximum ratings. it is recommended to implement a physical safety measure such as the insertion of a voltage clamp diode between the power supply and gnd pins. 3 ) gnd potential(pin 6, 36, 37, 45, 46). any state must become the lowest voltage about gnd terminal and vss terminal. 4 ) input terminal the parasitic elements are formed in the ic because of the voltage relation. the parasitic element operating causes the wrong operation and destruction. t herefore, please be careful so as not to oper ate the parasitic elements by impressing to input terminals lower voltage than gnd and vss. please do not apply the voltage to the input terminal when the power-supply voltage is not impressed. 5 ) setting of heat use a thermal design that allows for a sufficient margin in light of the power dissipation (pd) in actual operating conditions. this ic exposes its frame of the backside of package. note that this part is assumed to use after providing heat dissipation treatment to improve heat dissipation efficiency. try to occupy as wide as possible with heat dissipation pattern not only on the board surface but also the backside. class d speaker amplifier is high efficiency and low heat generation by comparison with conventional analog power amplifier. however, in case it is oper ated continuously by maximum output power, power dissipation (pdiss) may exceed package dissipation. please consider about heat design that power dissipation (pdiss) does not exceed package dissipation (pd) in average power (poav). (tjmax technical note 29/30 BD5446EFV www.rohm.com 2010.02 - rev. a ? 2010 rohm co., ltd. all rights reserved. allowable power dissipation measuring instrument ? ? ? ? technical note 30/30 BD5446EFV www.rohm.com 2010.02 - rev. a ? 2010 rohm co., ltd. all rights reserved. ordering part number b d 5 4 4 6 e f v - e 2 part no. part no. package efv : htssop-b54 packaging and forming specification e2: embossed tape and reel (unit : mm) htssop-b54 0.850.05 0.080.05 0.65 1.0max 0.22 +0.05 - 0.04 0.08 m s 0.08 54 28 27 1 18.50.1 (5.0) (6.0) 9.50.2 7.50.1 0.8 (max 18.85 include burr) 1pin mark 0.50.15 1.00.2 0.17 +0.05 - 0.03 s 4 + 6 ? 4 ? order quantity needs to be multiple of the minimum quantity. r1010 a www.rohm.com ? 2010 rohm co., ltd. all rights reserved. notice rohm customer support system http://www.rohm.com/contact/ thank you for your accessing to rohm product informations. more detail product informations and catalogs are available, please contact us. notes no copying or reproduction of this document, in part or in whole, is permitted without the consent of rohm co.,ltd. the content specified herein is subject to change for improvement without notice. the content specified herein is for the purpose of introducing rohm's products (hereinafter "products"). if you wish to use any such product, please be sure to refer to the specifications, which can be obtained from rohm upon request. examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the products. the peripheral conditions must be taken into account when designing circuits for mass production. great care was taken in ensuring the accuracy of the information specified in this document. however, should you incur any damage arising from any inaccuracy or misprint of such information, rohm shall bear no responsibility for such damage. the technical information specified herein is intended only to show the typical functions of and examples of application circuits for the products. rohm does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by rohm and other parties. rohm shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. the products specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, commu- nication devices, electronic appliances and amusement devices). the products specified in this document are not designed to be radiation tolerant. while rohm always makes efforts to enhance the quality and reliability of its products, a product may fail or malfunction for a variety of reasons. please be sure to implement in your equipment using the products safety measures to guard against the possibility of physical injury, fire or any other damage caused in the event of the failure of any product, such as derating, redunda ncy, fire control and fail-safe designs. rohm shall bear no responsibility whatsoever for your use of any product outside of the prescribed scope or not in accordance with the instruction manual. the products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospac e machinery, nuclear-reactor controller, fuel- controller or other safety device). rohm shall bear no responsibility in any way for use of any of the products for the above special purposes. if a product is intended to be used for any such special purpose, please contact a rohm sales representative before purchasing. if you intend to export or ship overseas any product or technology specified herein that may be controlled under the foreign exchange and the foreign trade law, you will be required to obtain a license or permit under the law. |
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