NJU7325 - 1 - single-phase dc brushless motor driver ic general description the NJU7325 is dual power amplifiers. it features mos-fet output for better saturation characteristics. it is suitable for small fan-motor applications. package outline NJU7325r/rb1 features z single supply z operating voltage v dd =2.4 to 5.5v z low operating current z low saturation output voltage vsat= 0.35v @io= 250ma z c-mos technology z package vsp8, tvsp8 block diagram 1 : a output 2 : a- input 3 : a+ input 4 : v ss 5 : b+ input 6 : b- input 7 : b output 8 : v dd absolute maximum ratings (ta=25 c) parameter ratings symbol (unit) note supply voltage +7.0 v dd (v) input voltage -0.3 to v dd +0.3 vid (v) operating temperature range -40 to +85 topr ( c) storage temperature range -50 to +150 tstg ( c) power dissipation 400 p d (mw) vsp8/tvsp8 (single) 1 2 3 4 5 6 7 8 ach bch - - + +
NJU7325 - 2 - recommended operating condition v dd = 2.4v 5.5v electrical characteristics (ta=25 c, v dd =5v) parameter symb ol condition min. typ. max unit operating current i dd no load condition : voltage follower vo=2.5v : 1 circuit - 3.0 4.0 ma input offset voltage v io - -15 - +15 mv input offset current i io - - 10 - pa input bias current i ib - - 10 - pa input impedance r in - - 10 12 - input common mode voltage range v icm - 0.4~4.0 - - v io=+250ma 4.55 4.65 - maximum output voltage range v om io=-250ma - 0.35 0.45 v large-signal voltage gain av - 55 - - db common mode rejection ration cmrr v icm =0.4 to 4.0v 53 - - db supply voltage rejection ration psrr v dd =4.5 to 5.5v 55 - - db unity gain bandwidth f t c l =10pf ; open loop - 1.5 - mhz slew rate sr voltage follower , r l =16.5 - 1 - v/ s note1) oscillation margin of NJU7325 will be narrow if the application features light load-current and low-gain (i.e. voltage follower). maintain the value of stray capacitance at the output terminal with less than 100pf to prevent the oscillation. note2) place decoupling-capacitor near v ss and v dd pins.
NJU7325 - 3 - application circuit note) place decoupling-capacitor near v ss and v dd pins. 1 2 3 4 5 6 7 8 a ch bch - - + + v dd m v ss [caution] the specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. the application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial ri g hts.
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