ver.2010/09/03 NJW4303 hall element-pwm type 3- phase motor control ic package outline NJW4303v block diaglam general description the NJW4303 is a 3-phase brushless dc motor control pre-driver ic with pwm control. it generates the most optimal current flow patterns by receiving rotor magnetic pole detection signals from hall elements of 3-phase brushless motor. operational voltage range for the ic has margin as 9.0v to 35v (maximum voltage of 40v), and it fits for a 12v/24v power supply. it is possible to put practical use such as speed control by internal oscillation circuit, and torque limiter control by current sensory circuit. with NJW4303, hi gh reliability of various motor drive controls can be realized by a variety of function and a substantial protection circuit. feature ? supply voltage : 9.0v ~ 35v ? pwm pre driver : upper = pch / lower = nch ? pwm control circuit ? forward / reverse detection : changeable while roating ? pwm oscillation circuit : setting by external capacitor ? protection circuit : ilimit, uvlo, tsd, ld ? soft start function ? short brake function ? on/off function : stop with s/s pin ? 120o / 60o phase difference change function ? multi fg output : 2 bit input change type ? controllable dead time settings ? package : ssop-32 h1+ h2+ h3+ frc vref osc verr gnd ilimit wl vl ul wh vh uh fr br fg h1- h2- h3- s/s n1 n2 dec vcc n n s s 3phase motor h h h fg-out + vm gnd + c frc c vcc c vref c os c c ct r fg lowpass filter c verr + + - vref uvlo saw oscillator + - pwm logic lock detect tsd + - + - + - dead ti m e rotor position decode
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