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~[}{]~~ [q)~u~ . november 96 product specification file under integrated circuits, ico1 re philips semiconductors
philips semiconductors product specification brushless dc motor drive circuit TDA5241 features .full-wave commutation (using push/pull drivers at the output stages) without position sensors .built-in start-up circuit .optimum commutation independent on motor type or motor loading .built-in flyback diodes .three push-pull outputs: -0.85 a output current -built-in current limiter .thermal protection .low current consumption by adaptative base-drive .tacho output without extra sensor. ..comparator for external position generator (pg) signal .built-in multiplexer combining internal fg and external pg signal on one pin for easy use with a controlling microprocessor .linear control of the output stages .pg signal output. applications .general purpose spindle driver ( e.g. vcr scanner motor). general description the TDA5241 is a bipolar integrated circuit used to drive brush less dc motors in full-wave mode. the device senses the rotor position using an emf-sensing technique and is ideally suited as a drive circuit for vcr scanner motors. quick reference data ~ measured over full voltage and temperature ranges symbol parameter min. typ. max. unit yp ium yo supply voltage range (note 1 } 4 0.6 ~ ~ v a v i cu!rent limiting 0.85 0.93 i ou~ut voltage at 10 = 100 ma(upper+lower transistor) note 1. an unstabilized supply can be used; transients of 2 v allowed with max slope 0.1 v/j.ls. 2/19 philips semiconductors product specification brushless dc motor drive circuit TDA5241 ordering information . . fig.1 power derating curve . 3/19 march 1997 philips semiconductors product specification 8 brushless dc motor drive circuit TDA5241 block diagram 4/19 march 1997 philips semiconductors product specification brushless dc motor drive circuit TDA5241 pinning description symbol pin 1 2 3 4 gnd1 n.c. mot2 vp pgin ground (0 v) motor supply return for output stages not connected driver output 2 dositive suddlv voltage position generator: input from the position detector sensor to the position detector stage (optional) 5 fgpg gnd2 pgout cap-cdm cap-cds cap-st cap- ti ctlin moto cap-cpc mot3 n.c. mot1 6 7 8 9 10 11 12 13 14 15 16 17 18 fg/pg (open collector) ground supply return for control circuits position generator output of the position detector stage 8 external capacitor connection for commutation delay timing external capacitor connection for commutation delay timing copy external capacitor connection for start-up oscillator external capacitor connection for timing non-inverting input of the control amplifier input from the start point of the motor coils external capacitor for stability of control loop driver output 3 i not connected i driver output 1 u 18 gnd1 mot1 17 n.c n.c . mot2 16 mot3 15 cap-cpc vp 14 moto pgin 10 i TDA5241 6 ctlin fgpg 13 gnd2 pgout 7 12 cap- ti 18 111 cap-st cap-cdm 19 cap-cds 110 fig.3 pin configuration. 5/19 march 1997 product specification philips semiconductors brushless dc motor drive circuit TDA5241 functional description the TDA5241 offers a sensorless three phase motor drive function. it is unique in its combination of sensorless motor drive and full-wave drive. the TDA5241 offers protected outputs capable of handling high currents and can be used with star or delta connected motors. it can easily be adapted for different motors and applications. the TDA5241 offers the following features: .sensorless commutation by using the motor emf .built-in start-up circuit .optimum commutation, independent of motor type or motor loading .built-in flyback diodes .three phase full-wave drive ..high output current (0.85 a) .outputs protected by current limiting and thermal protection of each output transistor .low current consumption by adaptive base-drive .accurate frequency generator (fg) by using the motor emf .comparator for external position generator (pg) signal .built-in multiplexer combining internal fg and external pg signals on one pin for easy use with a controlling microprocessor .linear control of the output stages. limiting values in accordance with the absolute maximum rating system (iec 134). min. unit parameter symbol v v v v v supply voltage vp vi 1 0 vo vi ptot -0.3 gnd -1 input voltage; all pins except vp (vi < 8 v) output voltage; pgout and pg/fg 8 output voltage; moto, mot1, mot2 and mot3 max. 18 i v p + 0.5 vp vp + vo 2.5 see power derating curve +150 +70 input voltage; cap-st, cap- ti, cap-cd and cap-dc total power dissipation loc ~ ~ 1-10 ~ tamb storage temperature range i operating ambient temperature range 6/19 march 1997 .5 philips semiconductors product specification TDA5241 brushless dc motor drive circuit march 1997 7/19 characteristics v p = 14.5 v 10%; t amb = 10 c to 70 c, unless otherwise specified symbol parameter conditions min typ max unit supply v p supply voltage range note 1 4 18 v i p input current range note 2 5.3 7 ma thermal protection t sd local temperature at temperature sensor causing shutdown 130 140 150 c t reduction in temperature before switchon after shutdown t sd 30 c mot0 center tap v i input voltage range 0.5 v p v i i input bias current 0.5 v |