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e u m6862/ a/b ds 6 862/a/b ver1.5 jun. 2012 1 24v pwm fan motor driver description eum6862/a/b is a fan motor driver for the single coil brushless dc motor. with its high efficient direct pwm control mode, eum6862/a/b controls the speed of brushless dc motor with a built in hall ic interface. eum6862/a/b is suitable to drive variable speed motors for personal computers power supply radiation fans and cpu coolers. eum6862/a/b integrates pwm fan speed control, minimum speed mode, soft start, fan tachometer, lock protection, auto restart and hall bias functions. pwm mode controls fan speed in low noise and low vibration ways by adjusting rctl voltage. eum6862/a/b can set minimum fan speed by presetting rmin voltage. with soft start function, eum6862/a/b can drive motor from slow speed to fast speed in a settable time by setting the external capacitor between ss and gnd. if a fan motor is stalled by the external force or obstacles, overdrive current may incur coil overheat and burning. to prevent motor from overheating, the lock protection circuit shuts down the internal power devices for a few seconds after the motor lock is detected. then the auto restart circuit resumes to power up the internal power devices. if the lock persists, eum6862/a/b shuts off power devices for a few seconds. the lock protection delay time is externally programmable by a capacitor. eum6862 has built in motor rotation speed feedback (fg) output, motor rotation detection (rd) output and hall sensor bias output. application circuit features built in 24v full-wave motor driver for fan motor built in kickback voltage protection, no zener diode need external programmable soft start and soft restart function wide input range 3v~28v pwm fan speed control programmable minimum fan speed built in soft switching function built in hall bias lock protection and auto restart fan rotation speed feedback fg output (eum6862/b) fan rotation detection rd output (eum6862/a) thermal shutdown protection available in tssop-16 and tdfn-14 packages rohs compliant and 100% lead (pb)-free halogen-free applications pc/server fan motor, cpu coolers and printer cooling fan figure 1. tssop -16 24v and 12v typical application circuit v?mw`r?y?b? www.gofotech.com
eum6862/a/b ds6862/a/b ver1.5 jun. 2012 2 application circuit (continued) figure 2. tdfn-14 24v and 12v typical application circuit fun c tional block diagram tss o p-16 short together vcc and pvcc, separate pgnd and gnd tdfn-14 separate vcc and pvcc, short together pgnd and gnd figure 3. functional block diagram n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eum6862/a/b ds6862/a/b ver1.5 jun. 2012 3 pin configurations package type pin configurations package type pin configurations eum6862 tssop-16 EUM6862A tdfn-14 eum6862b tdfn-14 pin description pin eum6862 EUM6862A eum6862b description pgnd 1,16 - - power device ground out2 2 1 1 power device output terminal 2. connect out2 to one side of the motor 3 - - power supply of internal control circuitry and power devices vcc - 3 3 power supply of internal control circuitry rmin 4 4 4 motor minimum rotation speed control rctl 5 5 5 motor rotation speed control cpwm 6 6 6 external capacitor connection input for pwm osc fg 7 - 7 rotation speed feedback output rd 8 7 - rotation detection output in+ 9 8 8 hall sensor positive input hb 10 9 9 hall sensor bias output in- 11 10 10 hall sensor negative input ss 12 11 11 soft start time setting terminal ct 13 13 13 lock protection time setup input 14 - - analog control circuit ground gnd - thermal pad thermal pad ic ground out1 15 14 14 power device output terminal 1. connect out1 to the other side of the motor. pvcc - 2 2 power supply of power devices reg - 12 12 6v regulator n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eum6862/a/b ds6862/a/b ver1.5 jun. 2012 4 ordering information order number package type mark ing operating temperature range eum6862qir1 tssop-16 xxxxx eum 6862 -30c to +90c EUM6862Ajir1 tdfn-14 xxxxx m68 62 -30c to +90c eum6862bjir1 tdfn-14 xxxxx 686 2b -30c to +90c eum6862/a/b lead free code 1: lead free, halogen free pack ing r: tape & reel operating temperature range i: industry standard package type q: tssop j: tdfn 1.eum6862, tssop-16 fg and rd output. 2.EUM6862A, tdfn-14 rd and reg output, separate vcc and pvcc. 3.eum6862b, tdfn-14 fg and reg output, separate vcc and pvcc. n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eum6862/a/b ds6862/a/b ver1.5 jun. 2012 5 power dissipation fig u re 4. tssop-16 package figure 5. tdfn-14 package n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eum6862/a/b ds6862/a/b ver1.5 jun. 2012 6 absolute maximum ratings (1) vcc, rd, fg (3), out1, out2 to gnd -------------------------------------------- -0.3v to 30v rmin, rctl to gnd --------------------------------------------------------------------- -0.3v to 7v cpwm, ss, ct, in+, in-, hb to gnd ---------------------------------------------- -0.3v to 6v pgnd to gnd ------------------------------------------------------------------------- -0.3v to +0.3v iout1, iout2----------------------------------------------------------------------------------- 1.0a ihb, ifg, ird ----------------------------------------------------------------------------------- 10ma maximum junction temperature ------------------------------------------------------------ +150c lead temperature (soldering, 10sec.) ------------------------------------------------------ +300c package thermal resistance ja (tssop-16) -------------------------------------------- 157c /w package thermal resistance ja (tdfn-14) --------------------------------------------- 110c /w power dissipation p d @ t a =+25c (tssop-16) ----------------------------------------- 0.8w power dissipation p d @ t a =+25c (tdfn-14) ------------------------------------------ 1.14w storage temperature --------------------------------------------------------------- -55c to +150c esd ratings hum a n body mode ------------------------------------------------------------------------------- 2kv thermal shut down----------------------------------------------------------------------------- 180c thermal shut down hysteresis ------------------------------------------------------------- 35c recommended operating conditions (2) supply voltage vcc and pvcc -------------------------------------------------------- 3v to 28v threshold input voltage rctl, rmin ------------------------------------------------ 0v to 6v hall input voltage range in+, in- ------------------------------------------------------ 0.2v to 3v operating temperature range ------------------------------------------------------ -30c to +90c note (1): stress beyond those listed under absolute maximum ratings may damage the device. note (2): the device is not guaranteed to function outside the recommended operating conditions. note (3): fg is open drain output, it can bear 30v voltage when fg is off (in+=h, in-=l). electrical characteristics specifications in standard type face are for t a =+25c, and those with bol d face type apply over the full operating temperature range t a =-30c ~+90c. vcc 12v ~24v unless otherwise specified. eum6862/a/b symbols parameters conditions min. typ. max. unit icc1 rotation mode - 3.6 5.5 icc2 lock protection mode vcc=12v - 1.8 3.2 icc3 rotation mode - 4.7 7 icc4 operating current lock protection mode vcc=24v - 2.6 4.2 ma hall input and hall bias vhn hall input sensitivity zero to peak (offset & hysteresis included) - 10 15 mv vhb hb output voltage ihb=5ma 1.1 1.2 1.3 v output vol output lower side saturation io=200ma - 0.10 0.13 voh output upper side saturation io=200ma - 0.20 0.26 v soft start block iss ss pin discharge current vss = 3.6v 0.37 0.50 0.64 a n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eum6862/a/b ds6862/a/b ver1.5 jun. 2012 7 electrical characteristics (continued) specifications in standard type face are for t a =+25c, and those with bold face type apply over the full operating temperature range t a =-30c ~+90c. vcc 12v ~24v unless otherwise specified. eum6862/a/b symbols parameters conditions min. typ. max. unit pwm blocks fpwm1 cpwm osc frequency 21 25 30 khz vcrl1 cpwm low level voltage 1.05 1.15 1.25 v vcrh1 cpwm high level voltage cp = 100pf vcc=12v 1.95 2.05 2.15 v fpwm2 cpwm osc frequency 21 25 30 khz vcrl2 cpwm low level voltage 2.2 2.3 2.4 v vcrh2 cpwm high level voltage cp = 47pf vcc=24v 3.95 4.1 4.25 v lock protection block ict1 ct charge current vct = 0v 1.57 2 2.37 a ict2 ct discharge current vct = 4.2v 0.16 0.20 0.25 a rct ratio of charge current to discharge current rct = ict1 / ict2 8 10 11 - vcth ct high level voltage 3.62 3.90 4.22 v vctl ct low level voltage 1.78 1.80 1.82 v fg & rd signal output vfg fg & rd pin low voltage ifg = 5ma - 0.1 - v ifgl fg & rd pin leak current vfg = 24v - - 5 a regulator output vreg regulator output voltage ireg=3ma 5.8 6.0 6.2 v n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eum6862/a/b ds6862/a/b ver1.5 jun. 2012 8 application notes hall sensor connection figu re 6. hall sensor inputs hall signal input terminals (h+ h- ) )) ) figure 7. hall sensor input voltage range set hall sensor input signal range 0.2v to 3v by adjusting the hall input level setting resistor r1. in the case of long board wiring pattern from hall element to hall signal input terminal, connect a capacitor between in+ and in- to avoid noise. the amplitude of hall input signal is recommended to be 60mv or higher due to the hall input amplifier 20mv hysteresis. the hall bias is 1.2v. vcc and pvcc bypass in tssop-16, connect a ceramic capacitor cm 1 f or more between vcc and gnd to absorb kick back voltage resulting from the high side re-circulation current; in tdfn-14, connect a ceramic capacitor 0.1 f or more between vcc and gnd. and connect a ceramic capacitor cm 1 f or more between pvcc and gnd to absorb kick back voltage resulting from the high side re-circulation current. gnd and pgnd line in tssop-16, gnd is connected to internal analog control circuits, and pgnd is connected to power devices. connect gnd to pgnd at only one place on the pcb board. pwm oscillator frequency the pwm osc frequency is programmed by the cp capacitor. (1-1) at vcc=12v, a 100pf cp sets pwm frequency 25khz and the pwm osc ramp cpwm swings between 1.15v to 2.05v. (1-2) at vcc=24v, a 47pf cp sets pwm frequency 25khz and the pwm osc ramp cpwm swings between 2.3v to 4.1v. pwm control speed mode pwm control mode works by comparing the voltage of rctl and cpwm. when rctl is low, one side upper power device and the other side lower side power device are turned on to charge the motor coil. when rctl is high, the upper side power device is turned off. the motor coil current is re-circulated between lower side power devices. the lower rctl is, the bigger the output duty is. big coil current makes motor run fast. fg output feedbacks motor rotational speed. the motor coil is charged all the time and motor speed becomes full speed when rctl voltage is lower than 2.3v at vcc=24v. soft start time connect a capacitor between ss and gnd to set soft start time. eum6862/a/b drives a motor from slow speed to fast speed during soft start time which is set by the external capacitor between ss and gnd. floating ss pin if soft start function is not used. if motor start current is too big, please increase capacitor between ss and gnd to make start time longer and start current smaller. if motor start current is too small to run, please decrease capacitor between ss and gnd to make start time shorter and start current bigger. minimum speed mode minimum speed of motor is set by the rmin voltage. when rctl voltage is higher than rmin voltage, the lowest duty is set by comparing rmin and pwm oscillator ramp cpwm voltage. when minimum speed mode function is not used, connect rmin to rctl. if rmin pin is connected to rctl and the rctl/rmin voltage is above 4.1v at vcc=24v, eum6862/a/b pwm duty cycle is 0% and motor stops. lock protection and auto restart when the motor is locked, the eum6862/a/b outputs will be disabled by the lock protection function. after a few seconds, the auto restart circuit will restart the motor. if the motor lockup persists, the lock protection will keep eum6862/a/b outputs off until the lock removes. rotation detection output rd pin is open-drain output, and rd is internally pulled down during rotation mode. when motor lock is detected, rd pin becomes high impedance. see figure 8. n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eum6862/a/b ds6862/a/b ver1.5 jun. 2012 9 figure 8. lock protection and auto restart figure 9. control time chart n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eum6862/a/b ds6862/a/b ver1.5 jun. 2012 10 eum6862/a/b operation truth table (cpwm-h=cpwm > rctl, cpwm-l=cpwm < rctl) ct cpwm in+ in- out1 out2 fg rd mode l h h l l h h l l h off rotation (drive) l h l l l l l h l l l off on rotation (recirculation) l h l l l h - h l l l off off lock protection n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eum6862/a/b ds6862/a/b ver1.5 jun. 2012 11 packaging information tssop-16 millimeters inch e s symbols min. normal max. min. normal max. a - - 1.20 - - 0.047 a1 0.00 - 0.15 0.000 - 0.006 b 0.15 - 0.30 0.006 - 0.012 e1 4.25 4.40 4.55 0.167 0.173 0.179 d 4.85 5.00 5.15 0.191 0.197 0.202 e 6.20 6.40 6.60 0.244 0.252 0.260 e 0.65 0.026 l 0.45 0.60 0.75 0.018 0.024 0.030 n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eum6862/a/b ds6862/a/b ver1.5 jun. 2012 12 tdfn-14 millimeters inch e s symbols min. normal max. min. normal max. a 0.70 0.75 0.80 0.028 0.030 0.032 a1 0.00 0.02 0.05 0.000 0.001 0.002 b 0.15 0.25 0.35 0.006 0.010 0.014 d 3.90 4.00 4.10 0.154 0.157 0.161 d1 2.70 3.00 3.30 0.106 0.118 0.129 e 2.90 3.00 3.10 0.114 0.118 0.122 e1 1.50 1.60 1.70 0.059 0.063 0.067 e 0.50 0.020 l 0.30 0.40 0.50 0.012 0.016 0.020 n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com

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