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| 1/14 www.rohm.com 2011.08 - rev.b ? 2011 rohm co., ltd. all rights reserved. class-ab speaker amplifiers 1.1w to1.5w monaural speaker amplifiers bh7824fvm,bh7826fvm description the bh7824fvm and bh7826fvm are speaker amplifier ics for low-voltage drives and low power consumption audio, specialized for mobile telephones and other mobile audio devices. features 1) btl monaural speaker amplifier 2) capable of high power 500mw/8 ? /btl output 3) wide power supply voltage range 4) supports active/shutdown modes 5) built-in anti-pop circuit 6) built-in thermal shutdown circuit applications mobile telephones, pdas, notebook computers, dsc, dvc, and other mobile audio devices. product lineup part no. bh7824fvm bh7826fvm input type unbalanced input balanced input supply voltage(v) 2.4 ~ 5.5 2.6 ~ 5.5 absolute maximum ratings(ta=25 ) parameter symbol limits unit supply voltage v cc max. 6.0 v power dissipation pd 470(*1) mw operating temperature topr -30 ~ +85(*2) storage temperature tstg -55 ~ +125 *1 reduced by 4.7 mw/ ? c at 25 ? c or higher, when mounted on a 70mm70mm1.6mm pcb board. *2 topr=70 ~ 85 is the range for performing basic operations and does not guarantee characteristics or rated output. moreover, tsd (thermal shutdown) may become operable if input signals occurring in this range are excessive. fig.1 ta-pd (when mounted on a pcb board) no.11090ebt01 0 100 200 300 400 500 0 50 100 150 temperature ta[ ] power dissipation pd[mw]
technical note bh7824fvm,bh7826fvm 2/14 www.rohm.com 2011.08 - rev.b ? 2011 rohm co., ltd. all rights reserved. operating conditions (ta=25 ) parameter ratings bh7824fvm bh7826fvm supply voltage 2.4v ~ 5.5v 2.6 ~ 5.5 * note: this ic is not designed to be radiation-resistant. electrical characteristics (unless otherwise noted ta=25 , vcc=3.6v, f=1khz, rl=8 ? ) parameter symbol limits(typ.) unit conditions ba7824fvm ba7826fvm circuit current 1 i cc1 3.5 3.5 ma no signal , active mode circuit current 2 i cc2 0 0 a no signal, suspend mode voltage gain 1 g v1 +11.5 +11.5 db v in =-20dbv,1st op-amp gain voltage gain 2 g v2 0 D db 2nd op-amp gain maximum output voltage1 v om1 +6.0 +6.0 dbv dstn=1% ,btl *1 maximum output voltage2 v om2 D +5.1 dbv v cc =3.4v,dstn=1%,btl *1 output distortion d stn 0.07 0.2 % v in =-20db,v se *1 output noise level v no -94 -94 dbv no signal, se active mode *2 suspend attenuation g s -107 -107 dbv v in =-20db,v btl *2 bias setting voltage v bias 1.8 1.8 v 3pin dc voltage suspend hold voltage / h v sh1 v cc 0.8 ~ v cc 2.0 ~ v cc v active mode, hold voltage suspend hold voltage / l v sh2 0 ~ 0.5 0 ~ 0.5 v suspend mode, hold voltage *1 : b.w.=0.4 ~ 30khz *2 : din audio technical note bh7824fvm,bh7826fvm 3/14 www.rohm.com 2011.08 - rev.b ? 2011 rohm co., ltd. all rights reserved. measurement circuit fig.2 bh7824fvm fig.3 bh7826fvm 100k 100k 0.1 1 22k 600 5 7 a/s bi as 1 2 3 4 6 8 22k 600 0.1 v cc 8 v 100 v 0.1 a/s bias 1 2 3 4 8 7 6 5 8 0.1 100 100k 22k 0.1 600 0.1 v v 1.0 technical note bh7824fvm,bh7826fvm 4/14 www.rohm.com 2011.08 - rev.b ? 2011 rohm co., ltd. all rights reserved. block diagram fig.4 bh7824fvm fig.5 bh7826fvm a/s suspend ctrl bias out bias in sp in sp out 1 v cc gnd sp out 2 1 2 3 4 8 7 6 5 bias sp in 2 suspend ctrl bias sp in 1 sp out 1 v cc gnd sp out 2 8 7 5 a/s bias 1 2 3 4 6 technical note bh7824fvm,bh7826fvm 5/14 www.rohm.com 2011.08 - rev.b ? 2011 rohm co., ltd. all rights reserved. equivalent circuit pin no. bh7824fvm bh7826fvm pin name equivalent circuit pin name equivalent circuit 1 suspend ctrl sp in2 2 bias out suspend ctrl 3 bias in bias in 4 sp in sp in1 5 sp out1 sp out1 6 v cc v cc 7 gnd gnd 8 sp out2 sp out2 note: numerical values in figures are design values, and do not guarantee ratings. 01 100k 50k 50k 01 1k 02 487k 30k 30k 02 100k 04 1k 05 30k 03 30k 57k 30k 03 30k 150k 04 1k 05 08 08 technical note bh7824fvm,bh7826fvm 6/14 www.rohm.com 2011.08 - rev.b ? 2011 rohm co., ltd. all rights reserved. application circuit bh7824fvm fig.6 bh7826fvm fig.7 r1 speaker sp_in 1 sp_in 2 suspend cf 01 02 03 04 08 07 06 05 1 r2 1 cf bias 0.1 r1 r2 bias a/s r1 r2 06 05 07 08 01 02 03 04 suspend sp_in(l+r) cf speaker technical note bh7824fvm,bh7826fvm 7/14 www.rohm.com 2011.08 - rev.b ? 2011 rohm co., ltd. all rights reserved. ranges rin 10k Q r1 Q 120k rf 47k Q r2 Q 120k cf gain +6db cf Q 560pf 0 gain Q +6db cf Q 270pf f cl f cl R 4khz functions and settings of external components function of external components r1 r1 is an input resistor of inverting amplifier which determines closed loop gain with r2. r2 r2 is a feedback resistor of invert ing amplifier determine closed loop gain with r2. the gain is set by below expression. gain = 20log [db] cf cf is feedback capacitor to cut high frequency signals. it forms a low-pass filter with r2. the cut-off frequency is calculated as below. f cl = [hz] ( ? ) r1,r2,cf and f cl has limits in below table. please set these component values in the ranges. cb1 (cb2 is only bh7824fvm.) the capacitors stabilize dc bias voltage. as cb1 (or cb2) becomes larger, power supply rejection ratio is improved but turn on time becomes longer. as it becomes smaller, turn on time becomes shorter but power supply rejection ratio and cross talk become worse. cin it is input coupling capacitor. the value of the input capacitor directly affect s the low frequency performance of the circuit. the corner frequency of the high pass filter is determined in equation at of next section. configuration of external components gain gain is designed by output power application ask for. output power is determined to below. po[w] = vo 2 [vrms] / rl[ ? ] vo = gv ? vin gv R rl po ? / vin values of r1 and r2 r1 and r2 are determined to av. av = ( r2 / r1 )2 input impedance (r1) must be probable driven by signal source input coupling capacitor corner frequency of hpf is determined in below. fc[hz] = 1 / (2 ? r1 ? cin) input coupling is solved by equation of fc. cin R 1 / (2 ? r1 ? fc) r2 r1 1 2 r2 cf bh7824fvm bh7826fvm cb1 1f 1f cb2 0.1f D technical note bh7824fvm,bh7826fvm 8/14 www.rohm.com 2011.08 - rev.b ? 2011 rohm co., ltd. all rights reserved. 8, 12 speakers 16 speaker bh7824fvm / 26fvm bh7824fvm co co Q 100pf co Q 47pf instruction for use carefully do not connect capacitive load has more than below capacitance between out1,2(5,8pin) and gnd otherwise oscillation may occured. do not use this ic without a load. this ic is compatible with dynamic speaker loads (8 40 ? bh7824fvm 8 12 ? bh7826fvm) and is not compatible with loads other than these mentioned. soft mute setting becomes effective on connecting a resist or and capacitor to the suspend pin (1pin: bh7824fvm, 2pin: bh7826fvm). place the vcc decoupling capacitor between vcc(6pin) and gnd(7pin) as close to ic as possible. 1 r c vcc recommendation value r 100k c 0.47f fig.9 bh7824fvm application circuit for soft mute co co 06 07 fig.8 output connections technical note bh7824fvm,bh7826fvm 9/14 www.rohm.com 2011.08 - rev.b ? 2011 rohm co., ltd. all rights reserved. typical characteri stics(bh7824fvm) 0 50 100 150 200 250 300 350 0 100 200 300 400 500 600 output powerpo[mw] power dissipationp d [mw] ta=room temperature vcc=3.6v f=1khz 40030kbpf thd+n1.0% r l =8 r l =16 0 1 2 1.5 2 2.5 3 3.5 4 4.5 5 5.5 supply voltagevcc[v] circuit currenticcs[ua] ta=room temperature r l =8 suspend=0v 0 2 4 6 8 10 1.52.02.53.03.54.04.55.05.5 supply voltagevcc [v] circuit currenticca[ma] ta=room temperature rl=8 suspend=vcc fig.11 circuit current (active) power supply fig.12 circuit current (suspend) power supply fig.13 output power power supply fig.14 power dissipation outpu power fig.15 power dissipation outpu power 0 100 200 300 400 500 600 700 0 200 400 600 800 1000 1200 output powerpo[mw] power dissipationp d [mw] ta=room temperature vcc=5.0v f=1khz 40030kbpf thd+n1.0% r l =16 r l =8 0 200 400 600 800 1000 1200 1.5 2 2.5 3 3.5 4 4.5 5 5.5 supply voltagevcc[v] output powerpo[mw] ta=room temperature f=1khz thd+n=1.0% 40030kbpf a v =8 r l =12 r l =8 r l =16 technical note bh7824fvm,bh7826fvm 10/14 www.rohm.com 2011.08 - rev.b ? 2011 rohm co., ltd. all rights reserved. fi 0.01 0.10 1.00 10.00 0.001 0.01 0.1 1 10 output powerpo[w] thd+n[%] ta=room temperature vcc=3.6v r l =8 f=1khz a v =2 40030kbpf 1m 10m 100m 1 10 0.01 0.10 1.00 10.00 0.001 0.01 0.1 1 10 output powerpo[w] thd+n[%] ta=room temperature vcc=3.6v r l =8 f=1khz a v =8 40030kbpf 1m 10m 100m 1 10 0.01 0.10 1.00 10.00 0.001 0.01 0.1 1 10 output powerpo[w] thd+n[%] ta=room temperature vcc=5.0v r l =8 f=1khz a v =8 40030kbpf 100m 10m 1m 1 10 0.01 0.10 1.00 10.00 0.001 0.01 0.1 1 10 output powerpo[w] thd+n[%] ta=room temperature vcc=5.0v r l =8 f=1khz a v =2 40030kbpf 1m 10m 100m 1 10 1 10 100 1000 -25 -20 -15 -10 -5 0 5 input levelvin[dbv] output powerpo[mw] ta=room temperature vcc=3.6v f=1khz r l =8 40030kbpf thd+n1.0% a v =2 1 10 100 1000 -40 -35 -30 -25 -20 -15 -10 input levelvin[dbv] output powerpo[mw] ta=room temperature vcc=3.6v f=1khz r l =8 40030kbpf thd+n1.0% a v =8 fig.16 output power input level fig.17 output power input level fig.18 thd + noise output power fig.19 thd + noise output power fig.20 thd + noise output power fig.21 thd + noise output power technical note bh7824fvm,bh7826fvm 11/14 www.rohm.com 2011.08 - rev.b ? 2011 rohm co., ltd. all rights reserved. 0.01 0.1 1 10 100 1000 10000 100000 frequencyf[hz] thd+n[%] ta=room temperature vcc=5.0v r l =8 po=300mw a v =2 wide band 1k 10k 100k 100 10 0.01 0.1 1 10 10 100 1000 10000 100000 frequencyf[hz] thd+n[%] ta=room temperature vcc=3.6v r l =8 po=150mw a v =8 wide band 1k 10k 100k 100 10 0.01 0.1 1 10 100 1000 10000 100000 frequencyf[hz] thd+n[%] ta=room temperature vcc=5.0v rl=8 po=300mw a v =8 wide band 1k 10k 100k 100 10 fig.22 thd + n frequency fig.23 thd + n frequency fig.25 thd + n frequency fig.26 gain(1stamp) power supply fig.27 gain(2ndamp) power supply fig.24 thd + n frequency 0.01 0.1 1 10 10 100 1000 10000 100000 frequencyf[hz] thd+n[%] ta=room temperature vcc=3.6v r l =8 po=150mw a v =2 wide band 1k 10k 100k 100 10 10.5 11.0 11.5 12.0 12.5 110 supply voltagevcc[v] voltage gaing v 1[db] ta=room temperature r l =8 f=1khz vin=-23dbv a v =8 25 1 10 -1.0 -0.6 -0.2 0.2 0.6 110 supply voltagevcc[v] voltage gaing v 2[db] ta=room temperature r l =8 f=1khz vin=-23dbv a v =8 2ndamp gain 2 5 1 10 technical note bh7824fvm,bh7826fvm 12/14 www.rohm.com 2011.08 - rev.b ? 2011 rohm co., ltd. all rights reserved. 0 25 50 75 100 125 0 25 50 75 100 125 150 175 suspend resistancer1[k] shut out timetoff[msec] c1=1.0f c1=0.47f c1=0.22f c1:the capacitor connected to suspend terminal ta=room temperature vcc=3.6v r l =8 -60 -50 -40 -30 -20 -10 0 10 100 1000 10000 100000 frequencyf[hz] power supply rejection ratio psrr[db] ta=room temperature vcc=3.6v rl=8 vripple=100mvpp btl r in =600 a v =8 a v =2 1k 10k 100k 100 10 -70 -60 -50 -40 -30 -20 -10 0 10 100 1000 10000 100000 frequency:f[hz] power supply rejection ratio psrr[db] a v =8 a v =2 ta=room temperature vcc=3.6v rl=8 vripple=300mvpp btl r in =600 1k 10k 100k 10 100 0 25 50 75 100 125 0 25 50 75 100 125 150 175 suspend resistancer1[k] wake up timeton[msec] ta=room temperature vcc=3.6v r l =8 c1=1.0f c1=0.47f c1=0.22f c1:the capacitor connected to suspend terminal fig.28 wake up time suspend terminal resistance fig.29 shut out time suspend terminal resistance fig.30 power supply rejection ratio frequency fig.31 power supply rejection ratio frequency technical note bh7824fvm,bh7826fvm 13/14 www.rohm.com 2011.08 - rev.b ? 2011 rohm co., ltd. all rights reserved. notes for use 1) numbers and data in entries are representative design values and are not guaranteed values of the items. 2) although rohm is confident that the example application circuit reflects the best possible recommendations, be sure to verify circuit characteristics for your particular application. modification of constants for other externally connected circui ts may cause variations in both static and trans ient characteristics for external compo nents as well as this rohm ic. allow for sufficient margins when determining circuit constants. 3) absolute maximum ratings use of the ic in excess of absolute maximum ratings, such as the applied voltage or operating temperature range (topr), 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 using the ic at times where the absolute maximum ratings may be exceeded. 4) gnd potential ensure a minimum gnd pin potential in all operating conditions. ma ke sure that no pins are at a voltage below the gnd at any time, regardless of whether it is a transient signal or not. 5) thermal design perform thermal design, in which there ar e adequate margins, by taking into account the permissible dissipation (pd) in actual states of use. 6) short circuit between terminals and erroneous mounting pay attention to the assembly direction of the ics. wrong m ounting direction or shorts betw een terminals, gnd, or other components on the circuits, can damage the ic. 7) operation in strong electromagnetic field using the ics in a strong electromagnetic field can cause operation malfunction. technical note bh7824fvm,bh7826fvm 14/14 www.rohm.com 2011.08 - rev.b ? 2011 rohm co., ltd. all rights reserved. ordering part number b h 7 8 2 4 f v m - t r part no. part no. 7824 7826 package fvm: msop8 packaging and forming specification tr: embossed tape and reel direction of feed reel ? order quantity needs to be multiple of the minimum quantity. r1120 a www.rohm.com ? 2011 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 specied herein is subject to change for improvement without notice. the content specied 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 specications, 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 specied 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 specied herein is intended only to show the typical functions of and examples of application circuits for the produc ts. 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 specied in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, ofce-automation equipment, commu- nication devices, electronic appliances and amusement devices). the products specied 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, re or any other damage caused in the event of the failure of any product, such as derating, redundancy, re 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, aerospace 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 specied 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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