n0211 sy 20111019-s00002/60910 sy 20090916-s00005 no.a1747-1/9 http://onsemi.com semiconductor components industries, llc, 2013 may, 2013 LV8805V overview the LV8805V is a motor driver for pc and server fans. feature ? direct pwm three-phsae sensorless motor driver specifications absolute maximum ratings at ta = 25 c parameter symbol conditions ratings unit v cc maximum supply voltage v cc max 16 v vg maximum supply voltage vg max 21 v out pin withstand voltage v out max 16 v out pin maximum output current i out max 1.2 a softst pin withstand voltage v softst max 6v fr pin withstand voltage v fr max 6v pwmin pin withstand voltage v pwmin max 6v fg output pin withstand voltage v fg max 16 v fg pin output current i fg max 5ma 1/2fg output pin withstand voltage v 1/2fg max 16 v 1/2fg pin output current i 1/2fg max 5ma rd output pin withstand voltage vrd max 16 v rd pin output current ird max 5ma allowable power dissipation 1 pd max1 independent ic 0.6 w allowable power dissipation 2 pd max2 mounted on designated board *1 1.3 w operating temperature topr -40 to +95 c storage temperature tstg *2 -55 to +150 c *1: when mounted on the designated 76.1mm 114 .3mm 1.6mm, glass epoxy board (single-layer) *2: do not exceed tjmax=150 c. caution 1) absolute maximum ratings represent the va lue which cannot be exceeded for any length of time. caution 2) even when the device is used within the range of abso lute maximum ratings, as a result of continuous usage under hig h temperature, high current, high voltage, or drastic temperature change, the reliability of th e ic may be degraded. please contact us for the further detai ls. bi-cmos lsi pc and server fan motor driver orderin g numbe r : ena1747a stresses exceeding maximum ratings may damage the device. maximum ratings are stress ratings only. functional operation above the recommended oper ating conditions is not implied. extended exposure to stresses above the recommended operating conditions may affect device reliabili ty.
LV8805V no.a1747-2/9 allowable operating conditions at ta = 25 c parameter symbol conditions ratings unit v cc supply voltage v cc 6 to 15 v softst input voltage range v softst 0 to vreg v fr input voltage range v fr 0 to vreg v minsp input voltage range v minsp 0 to vreg v electrical characteristics at ta = 25 c, v cc = 12v, unless otherwise specified ratings parameter symbol conditions min typ max unit circuit current 1 i cc 1 2.6 3.6 ma charge pump block charge pump output voltage v vg 17 v regulator block 5v regulator voltage v vreg 4.75 5 5.25 v output on resistance sum of high-/low-side output transistor on resistance ron (h+l) i o = 0.7a, v cc = 12v, vg = 17v 1.2 2 startup oscillator (osc) pin osc pin charge current i osc c -2.5 a osc pin discharge current i osc d 2.5 a pwm input (pwmin) pin high-level input voltage range v pwmin h 2.5 vreg v low-level input voltage range v pwmin l 0 1 v range of pwm input frequency f pwmin 15 60 khz forward/reverse switching pin high-level input voltage range v fr h order of current application : uout vout wout 2.5 vreg v low-level input voltage range v fr l order of current application : uout wout vout 0 1 v fg, 1/2fg, and rd output pins fg output pin low-level voltage v fg when i o is 2ma 0.25 0.35 v fg output pin leak voltage ilfg when v fg is 16v 1 a 1/2fg output pin low-level voltage v 1/2fg when i o is 2ma 0.25 0.35 v 1/2fg output pin leak voltage il1/2fg when v 1/2fg is 16v 1 a rd output pin low-level voltage v rd when i o is 2ma 0.25 0.35 v rd output pin leak voltage ilrd when v rd is 16v 1 a current limiter circuit limiter voltage v rf limit current set to 1a when rf is 0.25 . 0.225 0.25 0.275 v constraint protection circuit ct pin high-level voltage v ct h 2.25 2.8 2.95 v ct pin low-level voltage v ct l 0.43 0.5 0.65 v ct pin charge current i ct c -2.9 -2.5 -2.2 a ct pin discharge current i ct d 0.21 0.25 0.32 a ict charge/discharge ratio r ct 7 10 13 soft start circuit soft start releasing voltage v softst 2.5 v softst pin charge current i softst 0.6 a thermal protection circuit thermal protection circuit operating temperature tsd design target * 150 180 210 c * : design target value and no measurement is made. the thermal protection circuit is incorporated to protect the ic from burno ut or thermal destruction. since it operates outside the ic's guaranteed operating range, the cust omer's thermal design should be performed so that the thermal protection circuit will not be activated when the fan is running under normal operating conditions.
LV8805V no.a1747-3/9 package dimensions unit : mm (typ) 3361 pin assignment sanyo : ssop36j(275mil) 15.0 7.6 5.6 (3.5) (4.0) 0.2 0.5 0.1 (1.5) 1.7 max 0.3 0.8 (0.7) 1 36 2 top view side view side view bottom view pd max ? ta 0 1.0 0.5 1.5 ? 30 ? 20 80 100 0.57 1.30 0.60 0.26 60 20 40 0 120 ambient temperature, ta ? c allowable power dissipation, pd max ? w thermal resistance evaluation board : 76.1 114.3 1.6mm 3 glass epoxy thermal resistance evaluation board independent ic 1 comin 2 fil 3 vreg 4 vreg 5 nc 6 nc 7 f/r 8 pwmin 9 nc 10 softst 36 com 35 v cc 34 v cc 33 v cc 32 v cc 31 nc 30 uo 29 vo 28 wo 27 rf 11 fg 26 rf 12 1/2fg 25 nc 13 nc 24 rf 14 rd 23 sub_gnd 15 nc 22 cpc 16 ct 21 cp 17 osc 20 vg 18 gnd 19 gnd top view LV8805V
LV8805V no.a1747-4/9 block diagram charge pump vreg selector curr lim refosc start osc ctosc rd fg pri drive sensorless logic v cc uo vo com wo rf f/r vreg cpc cp ct vg rd fg 1/2fg pwmin osc fil comin com softst gnd sub_gnd
LV8805V no.a1747-5/9 pin function pin no. pin name function equivalent circuit 36 com motor middle point connection. 1 comin motor position detection comparator filter pin. a capacitor must be connected between this pin and the fil pin (pin 2). 2 fil motor position detection comparator filter pin. a capacitor must be connected between this pin and the comin pin (pin 5). vg 36 1 2 3 4 vreg regulator voltage (5v) output. a capacitor must be connected between these pins and ground. v cc vref 3 4 5, 6, 9 13, 15, 25, 31 nc no connection. these pins are not connected with the internal parts. 7 f/r motor rotation direction switching. a high-level input causes current to flow into the motor in the order of u, v, and w and a low-level input in the order of u, w, and v. changing the order of current application turns the motor in the opposite direction. vreg 100k 7 15k reverse signal forward signal forward/reverse switching signal 8 pwmin pwm signal input pin. "h" the output transistor is turned on by the level voltage input. "l" the output transistor is turned off by the level voltage input, and the motor stops. the speed of the motor is controlled by controlling duty of the input signal. when the pin opens, the motor becomes all velocities. vreg 8 10 softst soft start time setting. the motor can be started smoothly by connecting a capacitor between this pin and ground. 500 vreg 10 continued on next page.
LV8805V no.a1747-6/9 continued from preceding page. pin no. pin name function equivalent circuit 11 fg fg pulse output. this pin outputs a hall sensor system equivalent pulse signal. 12 1/2fg fg pulse output. this pin outputs 1/2 hall sensor system equivalent pulse signal. 14 rd motor lockup detection output. output is fixed high when motor is locked up. 12 11 14 16 ct motor lockup detection time setting. when the motor lockup condition is detected, the protection time period before the protection circuit is activated is set by connecting a cacacitor between this pin and ground. 500 vreg 16 17 osc motor startup frequency setting. a capacitor must be connected between this pin and ground. the startup frequency is adjusted by controlling the charge/discharge current and capacitance of the capacitor. vreg 17 500 500 18, 19 gnd gnd pin. 20 vg charge pump step-up voltage output. a capacitor must be connected between this pin and the v cc pin or ground. 21 cp charge pump step-up pulse output pin. a capacitor must be connected between this pin and the cpc pin (pin 22). 22 cpc charge pump step-up pin. a capacitor must be connected between this pin and the cp pin (pin 21). vreg v cc 21 22 20 23 sub_gnd gnd pin. 32, 33, 34, 35 v cc power supply for the ic and motor. capacitors must be connected between these pins and ground. 30 29 28 uo vo wo output pins. connect these pins to the u, v, and w of the motor coil. 24, 26, 27 rf output current detection pins. the drive current is detected by connecting a resistor between these pins and ground. 32 33 34 35 24 26 27 30 29 28
LV8805V no.a1747-7/9 application circuit example *1. power supply and gnd wiring the gnd is connected to the control circuit power supply system. *2. power-side power stabilization capacitor for the power-side power stabilizati on capacitor, use a capacitor of 10 f or more. connect the capacitor between v cc and gnd with a thick and along the shortest possible route. the v cc pins (pins 32, 33, 34, and 35) must be short-circuited on the print pattern. the gnd pins (pins 18 and 19) and the sub_gnd pin (pin 23) must be short-circuited on the print pattern. LV8805V uses synchronous rectification for high efficiency drive. synchronous rectification is effective for heat reduction and higher efficiency. howe ver, it may increase supply voltage. if the supply voltage shall increase, make sure that it does not exceed the maximum ratings by inserting a zener diode between power supply and gnd. *3. reverse connection protection diode this diode protects reverse connection. insert a diode between power supply and v cc pin to protect the ic from destruction due to reverse connection. connection of this diode is not necessary required. *4. comin and fil pins these pins are used to connect the filter capacitor. the lv 8804 uses the back emf signal generated when the motor is running to detect the information on the rotor position. the ic dertermines the timing at which the output block applies current to the motor based on the position informa tion obtained here. insert a filter capacitor with a capacitance ranging from 1,000pf to 10,000pf (reference value) between the comin pin and fil pin to prevent any motor startup missoperation that is caused by noise. ho wever, care must be taken since an excessively high capacitance will give rise to deterioration in efficiency and delays in the output power-on timing while the motor is running at high speed. furthermore, connect the capacitor between the comin pin and fil pin as close as possible in order to avoid the effects of noise from other sources. pwmin *10 *8 1000pf vg cp cpc vreg f/r pwmin ct softst osc uo vo wo com comin fil fg 1/2fg rd rf v cc gnd sub gnd *1 *3 *11 *11 *11 *11 fg 1/2fg rd rfg, r1/2fg, rrd =10k to 100k pwm control signal f=20khz to 50khz
LV8805V no.a1747-8/9 *5. ct pin this pin is used to connect the lock detection capacitor. the constant-current charging and constant-current discharging circuits inporporated causes locking when the pin voltage reaches 2.5v, and releasing the lock protection when it drops to 0.5v. this pin must be connected to the gnd when it is not going to be used. *6. rf pins these pins are used to set the current limit. when the pin voltage exceeds 0.25v, the cu rrent is limited, and regeneration mode is established. in the application circuit, this voltage is set in such a way that the current limit will be established at 1a. the calculation formula is given below. rf resistance = 0.25v/ta rget current limit value all the rf pins (pins 24, 26 and 27) must be short-circuited on the print pattern. *7. softst pin this pin is used to set the soft start. by connecting a capacitor between this pin and gnd , the motor speed can be increased gradually. when the pin voltage exceeds 2.5v, the soft start is re leased, and the lv8804v is switched to normal control. if the soft start function is not going to be used, connect the pin to the vreg pin. *8. osc pin this pin is used to connect the capacitor for setting the startup frequency. a capacitor with a capacitance ranging from about 500pf to 2,200pf (reference value) must be connected between this pin and gnd. the osc pin determines the motor startup frequency, so be sure to connect a capacitor to it. select a capacitance value that will result in the shortest possible startup time for achieving the target speed and produce minimal variations in the startup time. if the capacitance is too high, variations in the startup time will increase; conversely, if it is too low, the motor may idle. the optimum osc constant depends on the motor characteristics and startup current, so be sure to recheck them when the type of motor used or circuit specifications are changed. *9. vg, cp, and cpc pins these pins are used to connect the capacitors to genera te the pre-drive voltage and stabilize the pre-drive power supply. be sure to connect these capacitors in order to generate the drive voltage for the high-side (upper) output dmos transistor. *10. vreg pins these are the control system power supply pin and regulator output pin, which create the power supply of the control unit. be sure to connect a capacitor between this pin and gnd in order to stabilize control system operation. since these pins are used to supply curr ent for control and generate the charge pump voltage, connect a capacitor with a capacitance that is higher th an that of the capacitor connected to the charge pump. both the vreg pins (pins 3 and 4) must be short-circuited on the print pattern. *11. pin protection resistor it is recommended that resistors higher than 1k ? are connected serially to protect pins against misconnection such as gnd open and reverse connection.
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