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?2004 fairchild semiconductor corporation www.fairchildsemi.com rev.1.0.3 features ? a wide range of operation voltage: 4v to 28v ? locked motor protection with open collector alarm out or speed out and auto retry ? compact package: 8-sop-225 description the fan8412m/fan8413m is a monolithic integrated circuit, and suitable for dc cooling fan motors predriver. 8-sop-225 1 typical applications ? dc cooling fan motor ordering information note x : tape & reel nl : lead free device package operating temp. fan8412m 8-sop-225 ? 40 c ~ 95 c fan8412mx 8-sop-225 ? 40 c ~ 95 c fan8413m 8-sop-225 ? 40 c ~ 95 c fan8413mx 8-sop-225 ? 40 c ~ 95 c fan8412m_nl 8-sop-225 ? 40 c ~ 95 c fan8412mx_nl 8-sop-225 ? 40 c ~ 95 c fan8413m_nl 8-sop-225 ? 40 c ~ 95 c fan8413mx_nl 8-sop-225 ? 40 c ~ 95 c fan8412m/fan8413m 2 phase half wave bldc motor predriver
fan8412m/fan8413m 2 block diagram pin definitions pin number pin name i/o pin function description remark 1v cc p supply voltage - 2in + a hall input + - 3 al o alarm output (for fan8412m) open collector taco o speed output (for fan8413m) open collector 4in ? a hall input ? - 5 gnd p ground - 6lda triangle pulse generator for lock detector and automatic restart - 7out a a motor output a - 8out b a motor output b - in- in+ taco ld 6 3 4 2 v cc gnd 5 1 out b out a 8 7 commutation & control al /
fan8412m/fan8413m 3 equivalent circuits description pin no. internal circuit out a 7 out b 8 al / taco 3 ld 6 in+ 2 in- 4 7 8 commutation vcc lock detector 3 6 lock detector & automatic restart commutation v ldcp v ldcl 2 4 vcc
fan8412m/fan8413m 4 absolute maximum ratings (ta = 25 c) note1: pcb condition: thickness (1.6mm ), dimension (76.2mm * 114.3mm) refer: eia/j sed 51-2 & eia/j sed 51-3 should not exceed p d or aso value power dissipation curve (air condition = 0m/s) recommended operating conditions (ta = 25 c) parameter symbol value unit maximum power supply voltage v ccmax 32 v maximum power dissipation note1 p dmax 600 mw thermal resistance note1 ja 208 c/w maximum output voltage v omax 36 v maximum output current i omax 0.07 a alarm output current i al 10 ma alarm output withstanding voltage v al 36 v taco output current i taco 10 ma taco output withstanding voltage v taco 36 v operating temperature t opr ? 40 ~ 95 c storage temperature t stg ? 55 ~ 150 c parameter symbol min. typ. max. unit function compensation operating voltage v cc 4.0 ? 28.0 v power dissipation (w) 0.6 25 150 ambient temperature, ta ( c)
fan8412m/fan8413m 5 electrical characteristics (ta=25 c, v cc =12v unless otherwise specified) parameter symbol conditions min. typ. max. unit total supply current i cc when output is off. - 3.2 5.0 ma hall amplifier input range pin2,4 hall input range v hdc - 1 - vcc-2 v pin2,4 hall input offest v hof -15--mv lock detector & auto restart pin6 lock detector charging current i ldc v ld =1.5v 2.2 3.8 5.7 a pin6 lock detector discharging current i ldd v ld =1.5v 0.4 0.88 1.6 a pin6 lock detector charging/discharging ratio r cd r cd =i ldc /i ldd 357 ? pin6 lock detector capacitor clamp voltage v ldcl - 2.54 2.94 3.34 v pin6 lock detector capacitor comparator voltage v ldcp - 0.54 0.74 0.94 v output stage pin7, 8 output high level voltage v oh i o =10ma 10 10.5 - v pin7, 8 output low level voltage v ol i o =10ma - - 0.5 v al / taco output pin3 alarm output low level voltage v all i o =10ma - 0.2 0.5 v pin3 alarm output current capacity i al v al =2.0v 8 - - ma pin3 taco output low level voltage v tacol i o =10ma - 0.2 0.5 v pin3 taco output current capacity i tacol v taco =2.0v 8 - - ma
fan8412m/fan8413m 6 application information 1. lock detection & automatic restart fan8412m/fan8413m features a lock detection and an automa tic restart. the functions can be operated as follows. when the rotor is locked, there is no change in input signal of hall amplifier. a capacitor(c ld ) connected ld pin is continually charged by internal current source (i ldc ) to intrrnal threshold(v ldcl ). when the voltage, v cld on ld pin, reaches v ldcl , output power tr is turned-off to protect motor during t off and alarmoutput(al) becomes floating high and taco output(taco) becomes remain high or low. when the v cld reaches upper threshold,v ldcl ,v cld starts to decrease with internal current sink(i ldd ) to the low threshold,v ldcp . at that time, the v cld charging repeat until locked condition is removed, or fan8412m/fan8413m is power down. the auto-restart time (t on ), the motor protection time(t off ) are propotional to external capacitor,c ld and each value can be calculated as follow; for example,c ld =1uf, then t on =0.57sec, t off =2.2sec. this al or taco output can be used to inform a locked rotor con- dition or speed information to super io or system controller. because the al or taco output is open collector type, end user can pull up this pin with a external resister to th e supply voltage of their choice(that is 5 or 3.3v). t off t on hall input output v ldcl v ldcp al motor lock motor restart taco motor lock detected motor lock cleared t on c ld v ldcl v ldcp ? () i ldc ----------------------------------------------------------------------- = t off c ld v ldcl v ldcp ? () i ldd ----------------------------------------------------------------------- =
fan8412m/fan8413m 7 2. hall amplifier input block the hall current (i h ) is determined by r1, r2 and r3. where, the r2 is the impedance of hall sensor. an external capacitor, c1, can be used to reduce a power supply no ise. in addition, c2 is to remove a noise which is caused in case the line is long from the hall sensor output to the hall input (pin 2 / 4) of the device. the input bias voltage of hall amplifier is between 1v and v cc -2v as following figure. it is recommended that r1 and r3 should have the same valu e to make the output signal of hall sensor centered as v cc /2. fan8412/13m in- in+ 4 2 v cc hall sensor c2 c1 r1 r2 r3 fan8412m/fan8413m i h v cc r1 r2 r3 ++ ------------------------------------ = v cc v cc -2v v cc / 2 1v gnd
fan8412m/fan8413m 8 operation truth table test circuits in+ in- out a out b al taco remark high low high low low high rotating low high low high low low low or high low or high low or hi gh low or high high low or high lock 1 2 3 4 8 7 6 5 i cc v cc v cc out b taco ld v cc in+ in- out a gnd a i ldc / i ldd v ld a 1k al /
fan8412m/fan8413m 9 typical application circuits1 (12v / 24v) 1 d1 : a reverse protection diode for ic. 2.d2 : a reverse protection diode for motor coil. 3.d3/d4 : zener diode for freewheeling. 4.r1/r2 : a resister to set dc hall bias level. 5.r3/r4 : a resister to limit a base current of external power tr. 6. r5 : a pull-up resister for taco output signal when a fan motor is locked. 7. c1 : a capacitor for lock protection and detection of a fan motor. if lock protection and detection functions are not necessary , ld pin should be connect ground. 8.c2 : a capacitor to reduce a noise in hall input stage. this is not necessary in case of no noise. 9.c3 : this is not necessary in case the stable input on v cc is provided. 10.q1/q2 : an external power tr . commutation & control v cc hall in- in+ taco ld v cc gnd out b out a v signal v s v m d1 d2 d3 d4 r1 r2 r3 r4 c1 c2 r5 8 6 3 4 2 5 1 7 fan8412m/ fan8413m q1 q2 c3 al /
fan8412m/fan8413m 10 typical application circuits2 (48v) 1 d1 : a reverse protection diode for ic. 2.d2 : a reverse protection diode for motor coil. 3.d3/d4 : zener diode for freewheeling. 4.r1/r2 : a resister to set dc hall bias level. 5.r3/r4 : a resister to limit a base current of external power tr. 6.r5 : a pull-up resister for taco output signal when a fan motor is locked. 7.r6/r7 : a resister to set a output voltage of tr(q3). 8.c1 : a capacitor for lock protection and detection of a fan motor. if lock protection and detection functions are not necessary , ld pin should be connect ground. 9.c2 : a capacitor to reduce a noise in hall input stage. this is not necessary in case of no noise. 10.c3 : this is not necessary in case the stable input on v cc is provided. 11.q1/q2 : an external power tr . 12.q3 : an external power tr to control output voltage. commutation & control v cc hall in- in+ al / ld v cc gnd out b out a v s v m d2 d3 d4 r1 r2 r3 r4 c1 c2 r5 8 6 3 4 2 5 1 7 fan8412m/ fan8413m q1 q2 r6 r7 q3 d1 c3 v signal taco
fan8412m/fan8413m 11 package dimensions (unit: mm) 8-sop-225
fan8412m/fan8413m 12 package dimensions (unit: mm) 8-sop lead free
fan8412m/fan8413m 13 typical performance characreristics -50 -25 0 25 50 75 100 2 3 4 5 i cc current [ma] temperature [ o c] -50 -25 0 25 50 75 100 3 4 5 i ldc current [ua] temperature [ o c] -50 -25 0 25 50 75 100 0.4 0.6 0.8 1.0 1.2 1.4 1.6 i ldd current [ua] temperature [ o c] -50 -25 0 25 50 75 100 2.0 2.5 3.0 3.5 4.0 v ldcl voltage [v] temperature [ o c] -50 -25 0 25 50 75 100 0.6 0.7 0.8 0.9 v ldcp voltage [v] temperature [ o c] -50 -25 0 25 50 75 100 10.0 10.5 11.0 11.5 12.0 v oh voltage [v] temperature [ o c]
fan8412m/fan8413m 14 typical performance char acreristics(continued) -50 -25 0 25 50 75 100 0.0 0.1 0.2 0.3 0.4 0.5 [ o c] voltage [v] v all / v tacol temperature
fan8412m/fan8413m 15
fan8412m/fan8413m 3/19/04 0.0m 001 stock#dsxxxxxxxx ? 2003 fairchild semiconductor corporation life support policy fairchild?s products are not authorized for use as critical components in life support devices or systems without the express written approval of the president of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant in jury of the user. 2. a critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com disclaimer fairchild semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, funct ion or design. fairchild does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others.

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