1/5 rev. a structure : silicon monolithic integrated circuit product name : power driver for cd-rom device name : ba5912bfp features : ? driver exclusively for the 2-ch btl ? use of an hsop25pin power package can achieve downsiz ing of the set. ? a wide dynamic range ? using an external mute terminal , the output current can be muted. (ch1, ch2 independently muted.) ? muting both 2chs will lead to the standby mode. ? three power supply systems provided. (prevcc, ch1 powvcc, ch2 powvcc) ? two built-in general op-amps installed. ? a built-in thermal shut down circuit installed. { absolute maximum ratings (ta=25 c) parameter symbol limits unit power supply voltage vcc 13.5 v power dissipation pd 1.45 *1 w operating temperature range topr -35 to 85 c storage temperature range tstg -55 to 150 c *1 when mounted on the glass/epoxy board with the size: 70 mm 70 mm, the thickness: 1.6 mm, and the rate of copper foil occupancy area: 3% or less. over ta=25 c, derating at the rate of 11.6mw/ c. { recommended operating conditions (to deter mine a power supply voltage, the power dissipation must be taken into consideration.) parameter symbol limits unit pre-stage power supply voltage prevcc 4.5 to 13.2 v power-stage power supply voltage powvcc 4.5 to prevcc v this product has not been checked for the strategic materials (or service) defined in the foreign exchange and foreign trade control low of japan so that a verification work is required before exporting it. not designed for radiation resistance.
2/5 rev. a { electric characteristics (ta=25 c, pre, pow vcc=5v, bias=2.5v, rl=8 ? , unless otherwise noted.) the items except maximum output amplitude and standby circuit current have the constant limit values regardless of the voltage value of vref. parameter symbol min. typ max. unit condition consumption current (at no signal) icc - 9.0 14.0 ma when no load applied, ref1,2 2.0v standby circuit current iscc - 0 100 a when no load applied, ref1,2 0.5v output offset voltage voo -50 0 50 mv maximum output amplitude 1 vom1 3.2 3.5 - v ref1,2 0.5v maximum output amplitude 2 vom2 3.7 4.0 - v pre vcc=12v, pow vcc=5v ref1,2 > 2.0v closed circuit voltage gain gvc 10.0 11.5 13.0 db vin=bias 0.5v mute on voltage vmon gnd - 0.5 v mute off voltage vmoff 2.0 - vcc v vref switching voltage 1 vref1 gnd - 0.5 v pre vcc=pow vcc vref switching voltage 2 vref2 2.0 - vcc v pre vcc > pow vcc+vf offset voltage vofop -5 0 5 mv input bias current ibop - - 300 na high-level output voltage vohop 4.00 4.36 - v low-level output voltage volop - 0.74 1.1 v output driving current sink isink 10 50 - ma vcc with 50
attached output driving current source isource 10 40 - ma gnd with 50
attached slew rate srop - 1 - v/ s 100khz square wave, 4v p-p output { outline dimensions, symbols (unit: mm) part number
3/5 rev. a { application circuit diagram when used at pre vcc > pow vcc + vf and in the st andby mode, ref1 (pin3) and ref2 (pin12) must be set to open, or 0.5v or less. when used with ref1 (pin3) and ref2 (pin12) shorted; or mute1 (pin2) and mute2 (pin13) shorted, each microcomputer output must be abl e to supply a current of 300 a or so. { pin numbers, pin names no. pin name description no. pin name description 1 gnd substrate gnd 14 in2? ch2 input terminal for gain control 2 mute1 ch1 mute terminal 15 in2 ch2 input terminal with gain fixed 3 ref1 ch1vref switching terminal 16 op1-out operational amplifier 1 output 4 pow vcc1 pow vcc(ch1) 17 op1-in- operational amplifier 1- input 5 out
- ch1 negative output terminal 18 op-in+ operational amplifier 1+ input 6 out1+ ch1 positive output te rminal 19 gnd substrate gnd 7 gnd substrate gnd 20 bias bias input terminal 8 out2+ ch2 positive output terminal 21 op2-in+ operational amplifier 2+ input 9 out2- ch2 negative output terminal 22 op 2-in- operational amplifier 2- input 10 pow vcc2 pow vcc(ch2) 23 op2-out operational amplifier 2 output 11 pre vcc pre vcc 24 in1 ch1 input terminal with gain fixed 12 ref2 ch2vref switching terminal 25 in1? ch1 input terminal for gain control 13 mute2 ch2 mute terminal * the positive or negative polarity on an output terminal is determine by the input polarity.
4/5 rev. a { cautions on use (1) when the mute terminal voltage (at pin 2 and pin 13) is set to open or dropped to 0.5v (typ.) or less, the output current (ch1, ch2) can be muted individually. under condi tions of normal use, the pin 2 and pin 13 should be pulled-up to 2.0v or above. se tting both mute terminals (pin 2 and pin 13) to open, or 0.5v or less will automat ically enter the standby mode. (2) on the bias terminal (pin 20), the applied voltage of 0.7v (typ.) or less will ac tivate a mute function. under conditions of normal use, it should be set to 1.0v or above. (3) when the power supply voltage drops to 3.5v (typ.) or less, the internal circuit will turn off and, when recovering to 4.0v (typ.) or above, the internal circuit will startup. (4) thermal shutdown (tsd), mute on, bias termi nal voltage drop, or power supply voltage drop will activate the mute function, where only the driver pa rt can be muted. while muting, the voltage at the output terminal will equal to the internal bias voltage. (5) when pre vcc=pow vcc, the vref switching terminal must be set to open or 0.5v or less (internal bias voltage=(pow vcc - vf)/2); or, when pre vcc>pow vcc+ vf, the vref switching terminal must be pulled up to 2.0v or above (internal bias voltage=pow vcc/2). (6) even though a radiating fin is c onnected to the gnd inside of the pa ckage, it must be connected to the external gnd. (7) about absolute maximum ratings exceeding the absolute maximum ratings, such as the applied voltage or the operating temperature range, may cause permanent device damage. as these cases cannot be limited to the broken short mode or the open mode, if a special mode where the absolute maximum ratings may be exceeded is assumed, it is recommended to take mechanical safety measures such as attaching fuses. (8) about power supply lines as a measure against the back current regenerated by a counter electromotive force of the motor, a capacitor to be used as a regenerated-current path can be installed between the power supply and gnd and its capacitance value should be determined after careful check that any problems, for example, a leak capacitance of the electrolytic capacitor at low tem perature, are not found in various characteristics. (9) about gnd potential the electric potential of the gnd terminal must be k ept lowest in the circuitry at any operation states. (10) about thermal design with consideration of the power dissipation (pd) under conditions of actual use, a thermal design provided with an enough margin should be done. (11) about operations in a strong electric field when used in a strong electric field, note that a malfunction may occur. (12) aso when using this ic, the output tr. must be set not to exceed the values s pecified in the absolute maximum ratings and aso. (13) thermal shutdown circuit this ic incorporates a thermal shutdown circuit (tsd circuit). when the chip temperature reaches the value shown below, the coil output to the motor will be set to open. the thermal shutdown circuit is designed only to s hut off the ic from a thermal runaway and not intended to protect or guarantee the entire ic functions. therefore, users cannot assume t hat the tsd circuit once activat ed can be used cont inuously in the subsequent operations. tsd on temperature [ c] (typ.) hysteresis temperature [ c] (typ.) 175 25 (14) about earth wiring patterns when a small signal gnd and a large current gnd are provided, it is recommended that the large current gnd pattern and the small signal gnd patte rn should be separated and grounded at a single point of the reference point of the set in order to prevent the voltage of the sm all signal gnd from being affected by a voltage change caused by the resistanc e of the pattern wiring and the large current. make sure that the gnd wiring patterns of the external components will not change, too.
5/5 rev. a (15) this ic is a monolithic ic which has a p + isolations and p substrate to isolate elements each other. this p layer and an n layer in each element form a pn junction to construct various parasitic elements. due to the ic structure, the parasi tic elements are inevitabl y created by the potential relationship. activation of the parasitic elem ents can cause interfer ence between circuits and may result in a malfunction or, consequently, a fatal damage. therefore, make sure that the ic must not be used under conditions that may activate the parasitic el ements, for example, applying the lower voltage than the ground level (gnd, p substr ate) to the input terminals. in addition, do not apply the voltage to input termi nals without applying the power supply voltage to the ic. also while applying the power supply volt age, the voltage of each i nput terminal must not be over the power supply voltage, or within the guar anteed values in the elec tric characteristics.
notes no technical content pages of this document may be reproduced in any form or transmitted by any means without prior permission of rohm co.,ltd. the contents described herein are subject to change without notice. the specifications for the product described in this document are for reference only. upon actual use, therefore, please request that specifications to be separately delivered. application circuit diagrams and circuit constants contained herein are shown as examples of standard use and operation. please pay careful attention to the peripheral conditions when designing circuits and deciding upon circuit constants in the set. any data, including, but not limited to application circuit diagrams information, described herein are intended only as illustrations of such devices and not as the specifications for such devices. rohm co.,ltd. disclaims any warranty that any use of such devices shall be free from infringement of any third party's intellectual property rights or other proprietary rights, and further, assumes no liability of whatsoever nature in the event of any such infringement, or arising from or connected with or related to the use of such devices. upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or otherwise dispose of the same, no express or implied right or license to practice or commercially exploit any intellectual property rights or other proprietary rights owned or controlled by rohm co., ltd. is granted to any such buyer. products listed in this document are no antiradiation design. appendix1-rev2.0 thank you for your accessing to rohm product informations. more detail product informations and catalogs are available, please contact your nearest sales office. rohm customer support system the americas / eupope / asia / japan contact us : webmaster@ rohm.co. jp www.rohm.com copyright ? 2007 rohm co.,ltd. the products listed in this document are designed to be used with ordinary electronic equipment or de vices (such as audio visual equipment, office-automation equipment, communications devices, electrical appliances and electronic toys). should you intend to use these products with equipment or devices which require an extremely high level of reliability and the malfunction of which would directly endanger human life (such as medical instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other safety devices), please be sure to consult with our sales representative in advance. it is our top priority to supply products with the utmost quality and reliability. however, there is always a chance of failure due to unexpected factors. therefore, please take into account the derating characteristics and allow for sufficient safety features, such as extra margin, anti-flammability, and fail-safe measures when designing in order to prevent possible accidents that may result in bodily harm or fire caused by component failure. rohm cannot be held responsible for any damages arising from the use of the products under conditions out of the range of the specifications or due to non-compliance with the notes specified in this catalog. 21, saiin mizosaki- cho, ukyo-ku, kyoto 615-8585, japan tel : +81-75-311-2121 fax : +81-75-315-0172 appendix
|
