NJU7349 -1- ver.1.0 single-phase dc brushless motor driver ic ? general description the NJU7349 is single-phase dc brushless motor driver ic. it features mos-fet driver circuit for better output characteristics. the driver includes pwm_in input for rotation speed control. maximum output current is 1000ma and continuance output current is 500ma. it is suitable for variable speed fan required low noise & good efficiency characteristics. ? package outline NJU7349r ? features ? speed control with pwm signal input ? operating voltage 2.2 to 5.5v ? internal lock detect / auto release circuit ? half-fg output ? thermal shutdown circuit ? low operating current i dd =2ma ? low saturation output voltage vsat= 0.25v @io= 500ma ? cmos technology ? package outline vsp10 ? block diaglam ? pin function 1: ct 2: half-fg 3: v dd 4: out b 5: pwm_in 6: vss 7: out a 8: v dd 9: in- 10: in+ (note) all v dd pins should be connected the powe r supply and the ground respectively. otherwise, the electrical characteristic may not satisf y specifications ld 8 9 10 6 4 5 3 2 1 ts 7
NJU7349 - 2 - ? absolute maximum ratings (ta=25 c) parameter ratings symbol (unit) note supply voltage +7.0 v dd (v) input voltage -0.3 v dd +0.3 v id (v) output current (continuance) 500 i o (ma) output current (peak) 1000 i o peak (ma) operating temperature range -40 +85 topr ( c) storage temperature range -50 +150 tstg ( c) power dissipation 400 p d (mw) device itself ? recommended operating conditions (v dd =5v, ta=25c) parameter symbol condition min. typ. max. unit supply voltage v dd ct=0 2.2 5.0 5.5 v junction temperature range tj - -40 - 125 c input common mode voltage range v icm - 0.4 - 4.0 v output current i o - - - 500 ma
NJU7349 - 3 - ? electrical characteristics (v dd =5v, ta=25c) parameter symbol condition min. typ. max. unit general operating current i dd - - 2.0 4.0 ma thermal shutdown temperature t tsd - - 180 - c thermal shutdown hysteresis t hys - - 50 - c hall amplifier input offset voltage v io - -5 - 5 mv feedback resistance r f - 22.0 27.5 33.0 k ? open loop gain a v - - 80 - db input common mode voltage range v icm - 0.4 4.0 - - v output v oh io=+350ma 4.65 4.80 - maximum output voltage range v ol io=-350ma - 0.20 0.35 v r onh io=+500ma - 0.5 - output resistance r onl io=-500ma - 0.5 - ? fg l output voltage v fg 9pin=0v, 10pin=5v, r l =10k ? - - 0.3 v fg h leak current i fg-leak 9pin=5v, 10pin=0v, r l =10k ? - - 1.0 a lock detect circuit* lock protect operation voltage v lop - 4.0 - - v lock detect charge current i chg - - 0.6 - a lock detect discharge current i dchg - - 0.1 - a clamp voltage v cl - - 2.8 - v detect voltage v id - - 0.8 - v pwm_in input input high voltage v ihp 0.7 v dd - v dd v input low voltage v ilp 0 - 0.3v dd v
NJU7349 - 4 - ? time chart pwm timing lock protection timing in+ in- out a outb ct half-fg pwm_in ton in+ in- outa outb c t half - fg mo to r lo c ke d lock release vid vcl tof f tof f motor lock protection period pw m_ in
NJU7349 - 5 - ? typical characteristics vdd-idd gnd=0v, in-=5v, in+=ct=0v mea s:v dd 0.0 0.5 1.0 1.5 2.0 2.5 02468 vdd(v) idd(ma ) vdd-voh gnd=0v , in- =v dd/2, in+=ct=0v meas:outb (io=500ma) 0 50 100 150 200 250 300 350 400 450 500 01234567 v dd( v ) voh(mv) vdd-vol gnd=0v, in+=vdd/2, in-=ct=0v meas:outb (io=500ma) 0 50 100 150 200 250 300 350 400 01234567 vdd(v) vol(mv) io- v oh vdd=5v, gnd=0v, in-=2.5v, in+=ct=0v mea s: outb 0 200 400 600 800 1000 1200 1400 0 500 1000 1500 2000 io( ma ) voh(mv) io- v ol vdd=5v, gnd=0v, in+=2.5v, in-=ct=0v mea s:outb 0 200 400 600 800 1000 1200 1400 1600 0 500 1000 1500 2000 io( ma ) vo l(mv) ifg- v fg vdd=5v, gnd=0v, in-=2.5v, in+=ct=0v mea s:fg 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 0123456789101112131415 ifg( ma ) vfg(mv)
NJU7349 - 6 - ? typical characteristics vdd-ich gnd=0v , in- =v dd/2, in+=ct=0v mea s: ct 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 0.01.02.03.04.05.06.07.0 vdd(v) ich(ua) vdd-idch gnd=0v, in-=vdd/2, in+=0v, ct=vdd mea s: ct 0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 vdd(v) idch(ua) v dd- v c l gnd=0v, in-=vdd/2, in+=ct=0v mea s: outb 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 vdd(v) vcl(v) v dd- v id gnd=0v , in- =v dd/ 2, in+=0v , ct =v dd mea s:outb 0.0 0.2 0.4 0.6 0.8 1.0 1.2 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 vdd(v) vid(v)
NJU7349 -7- ? application note the NJU7349 are single-phase dc brushless motor driver ic in small vsp-10 package. with minimal external components, that can drive up to 500ma of motor current for small fan application. [application circuit example] in+ in- vdd ct vss outb out a fg moto r hall element c2 r1 r l r2 fg out NJU7349 v+ gnd c1 d1 pwm_in pwm_in [design notes] above application example is designed for 5v operation with motor current of 500ma. it uses the following components: hall elements: hw101a (ake) 1. selection of c1 and d1: c1 is used for a noise reduction purpose. a typical value is 0.1uf. optimize the value in actual operating conditions if necessary. d1 is a diode for protection against reverse voltage supply. silicon rectifier diode (wo3c, 10d1 and equivalent) is appropriate. 2. lock protection function (design of c2 value): lock protection function, consists of motor lock detection and auto resume function, is a safety feature to protect a motor and a driver circuit from fatal destruction in case of motor halt. motor lock detection detects motor halt due to irregular load conditions and then cuts motor driving current f or safety operation. a value of c2 determines lock detection time (ton) and auto resume time (toff). lock detection time (ton) is given by: [] sec 2 ich v v c t id cl on ? =
NJU7349 - 8 - where c2 is 0.15uf: auto resume time (toff) is given by: where c2 is 0.15uf: in actual application, lock detection time (ton) is affected by the mechanical time constant of a motor. therefore, constant start up must be confirmed in actual evaluation taking operating variations (i.e. temperature, voltage change and so on) in consideration. a typical value of c2 is either from 0.1uf to 0.47uf depending on a motor. *remarks : when v dd becomes lower than 4v,the clamp voltage( v cl ) becomes lower accordingly. this makes ton and toff shorter and may cause issues associated with the restarting of the motor from the lock protection state. therefore, careful evaluation is necessary with actual motors. 3. design of hall element bias resistance ( r1 and r2 ) hall amplifier is a differential amplifier. the common-mode input voltage is between 0.4v and vdd-1v and the input signal must be within the range. non-excitation hall bias voltage is to be set at a half of vdd for effective use of common-mode input voltage range. therefore the same value of hall bias resistors is selected for r1 and r2. given that the bias current is set to be 5ma by hw101a datasheet, r1 and r2 can be determined as follows: ? = = ? = = = + + ? 300 2 1 0 . 1 10 5 5 2 1 3 r r k ihbias vdd rin r r [] sec 49 . 0 10 6 . 0 8 . 0 8 . 2 10 15 . 0 6 6 = ? = ? ? on t [] sec 2 idis v v c t id cl off ? = [] sec 00 . 3 10 1 . 0 8 . 0 8 . 2 10 15 . 0 6 6 = ? = ? ? off t motor lock protection period returns to normal operation hall input motor output ct terminal voltage motor locked ton toff v cl
NJU7349 - 9 - the output voltage of hall elements is influenced by the bias current and magnetic flux density of hall elements. the optimum input voltage of NJU7349 are 100mvp-p and higher. with such input voltage, the highest efficiency can be obtained. 4. design of fg output resistance ( r l ) fg out (fg: pin2) is an open drain output and r l is a pull up register. a typical value of r l is 10k ? . the timing chart of fg is as follows. note that the pull up resistance shall be connected to below supply voltage. the specifications on this data book are only given fo r information, without any guarantee as regards eithe r mistakes or omissions. the application circuit in this dat a book are described only to show representative usages o f the product and not intended for the guarantee o r permission of any right including the industrial rights. hall input in+ fg terminal volta g e
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