BU6904NUX-GTR

Datasheet DC Brushless Fan Motor Driver 5V Single-phase Full-wave Fan Motor Driver BU6904NUX ●General Description The BU6904NUX is a 5V single-phase full-wave FAN motor driver with built in HALL element. This is a DC brushless FAN motor driver series. That has compact package, auto gain control function (Henceforth, abbreviated to AGC), silent drive by soft switching, and saving motor start up current by soft start function. This is the best lineup for note PC cooling FANs ●Package(s) VSON008X2030 ●Features „ Built in HALL element. „ A GC function. „ Soft switching drive (PWM type). „ Soft start function „ Incorporating lock protection and automatic restart circuit. „ Compact package „ Rotating speed pulse signal (FG) output „ Vcc speed control (1.8V to 5.5V). W(Typ.) x D(Typ.) x H(Max.) 2.00mm x 3.00mm x 0.60mm VSON008X2030 ●Applications „ For compact 5V FAN such as notebook PC cooling FAN ●Absolute Maximum Ratings Parameter Supply voltage Power dissipation Operating temperature Storage temperature Output voltage Output current FG signal output voltage FG signal output current Junction temperature * ** Symbol Vcc Pd Topr Tstg Vomax Iomax Vfg Ifg Tjmax Limit 7 410* -40 to +85 -55 to +125 7 800** 7 10 125 Unit V mW ℃ ℃ V mA V mA ℃ Limit 1.8 to 5.5 Unit V Reduce by 4.1mW/℃ over 25℃. (70.0mm×70.0mm×1.6mm glass epoxy board) This value is not to exceed Pd. ●Operating Rating Parameter Operating supply voltage range Symbol Vcc ○Product structure：Silicon monolithic integrated circuit .www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・14・001 ○This product is not designed protection against radioactive rays 1/14 TSZ02201-0H1H0B100070-1-2 31.Jul.2012 Rev.002 Datasheet BU6904NUX ●Block Diagram Take a measure against voltage rise due to reverse connection of power supply and back electromotive force. HALL ELEMENT Vcc OFFSET CANCEL 1 Page 11. 2 UVLO 3 TSD OUT2 FG 7 PRE DRIVER H-BRIDGE OUT1 6 PGND PWM DUTY 4 Page 12. 8 CONTROL LOGIC TEST This is an open drain output. Connect a pull-up resistor. A/D CONVERSION OSCILLATOR CIRCUIT VM TEST pin is for ROHM original testing when it is shipped. Make sure to open or connect TEST pin with Vcc. GND 5 LOCK PROTECTION SIGNAL OUT M Conventional FAN motor driver IC with HALL IC needs adjusting HALL bias resistor due to vary factor about HALL amplitude. This IC automatically controls HALL amplitude. The result doesn’t need adjusting HALL amplitude by built in HALL element and unique AGC function. Page 8. TSD : Thermal shut down(heat rejection circuit) UVLO :Under voltage lock outputs (low voltage protection circuit) Figure 1. Block diagram and application circuit ●Pin Description P/No. 1 2 3 4 5 6 7 8 T/Name Vcc VM TEST OUT2 PGND OUT1 FG GND Function Power supply terminal 1 Power supply terminal 2 TEST terminal Motor output terminal 2 Ground terminal 2 Motor output terminal 1 FG signal output terminal Ground terminal 1 * TEST pin is for ROHM original testing when it is shipped. Make sure to open or connect TEST pin with Vcc. ●I/O truth table ・Supply magnetic direction (positive) ・Output operation S Vout1 Vout2 Marking Bhys Brev Bhys Bfwd Magnetic flux density: B N Brev Bfwd Magnetic flux density: B Figure 2. Output operation Supply magnetic direction S N www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 OUT1 OUT2 FG L H H L H(Output Tr：OFF) L(Output Tr：ON) 2/14 TSZ02201-0H1H0B100070-1-2 31.Jul.2012 Rev.002 Datasheet BU6904NUX ●Electrical Characteristics (Unless otherwise specified Ta=25℃,Vcc=5V) Limit Parameter Symbol MIN TYP MAX Circuit current Icc 2 4 Magnetic switch-point for Bfwd 1.5 forward rotation Magnetic switch-point for Brev -1.5 reverse rotation Magnetic hysteresis Bhys 3.0 5.0 Unit Figure 3. mT Figure 4. mT Figure 5. mT Vo - 0.16 0.24 V FG low voltage FG leak current Lock detection ON time Lock detection OFF time The maximum time of soft start 50% DUTY Vfgl Ifgl Ton Toff 0.35 3.5 0.50 5.0 0.4 5 0.65 6.5 V µA s s T50 114 164 214 ms 3/14 Characteristics mA Output voltage www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 Conditions Figure 6. Io=200mA Upper and Lower total Ifg=5mA Vfg=7V Figure 7 to 12. Figure 13,14. Figure 15. Figure 16. Figure 17. TSZ02201-0H1H0B100070-1-2 31.Jul.2012 Rev.002 Datasheet BU6904NUX Magnetic switch-point for forward rotation : Bfwd [mT] ●Typical Performance Curves 1 Circuit current : Icc [mA] 4.0 3.0 85℃ 25℃ -40℃ 2.0 1.0 Operating Voltage Range 0.0 1 2 3 4 5 Supply voltage : Vcc [V] 2.5 2.0 1.5 0.5 0.0 -0.5 -1.0 -1.5 -2.0 Operating voltage range -2.5 6 1 Figure 3. Circuit current 1 2 3 4 5 Supply voltage : Vcc [V] 6 Figure 4. Magnetic switch-point for forward rotation 3.0 2.5 2.0 Magnetic hysteresis : Bhys [mT] Magnetic switch-point for reverse rotation : Brev [mT] 85℃ 25℃ -40℃ 1.0 1.5 1.0 0.5 0.0 -0.5 85℃ 25℃ -40℃ -1.0 -1.5 2.5 85℃ 2.0 25℃ -40℃ 1.5 1.0 0.5 -2.0 Operating Voltage Range Operating voltage range -2.5 0.0 1 2 3 4 5 Supply voltage : Vcc [V] 6 Figure 5. Magnetic switch-point for reverse rotation www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 4/14 1 2 3 4 5 Supply voltage : Vcc [V] 6 Figure 6. Magnetic hysteresis TSZ02201-0H1H0B100070-1-2 31.Jul.2012 Rev.002 Datasheet BU6904NUX 1.0 1.0 0.8 0.8 Output H voltage : Voh [V] Output H voltage : Voh [V] ●Typical Performance Curves 2 0.6 0.4 85℃ 25℃ -40℃ 0.2 0.6 1.8V 0.4 5.0V 5.5V 0.2 0.0 0.0 0.0 0.2 0.4 0.6 Output current : Io [A] 0.8 0.0 0.2 0.4 0.6 Output current : Io [A] 0.8 Figure 8. Output H voltage (Voltage characteristics) Figure 7. Output H voltage (Temperature characteristics) 1.0 1.0 1.8V 0.8 Output L voltage : Vol [V] Output L voltage : Vol [V] 0.8 0.6 85℃ 0.4 25℃ -40℃ 0.6 0.4 5.0V 5.5V 0.2 0.2 0.0 0.0 0.0 0.2 0.4 0.6 Output current : Io [A] 0.8 Figure 9. Output L voltage (Temperature characteristics) www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 0.0 0.2 0.4 0.6 Output current : Io [A] 0.8 Figure 10. Output L voltage (Voltage characteristics) 5/14 TSZ02201-0H1H0B100070-1-2 31.Jul.2012 Rev.002 Datasheet BU6904NUX ●Typical Performance Curves 3 1.0 1.0 1.8V 0.8 85℃ Output voltage : Vo [V] Output voltage : Vo [V] 0.8 25℃ 0.6 -40℃ 0.4 5.0V 0.6 5.5V 0.4 0.2 0.2 0.0 0.0 0.0 0.2 0.4 0.6 Output current : Io [A] 0.0 0.8 0.2 0.4 0.6 Output current : Io [A] 0.8 Figure 12. Output voltage (Upper and lower total) (Voltage characteristics) Figure 11. Output voltage (Upper and lower total) (Temperature characteristics) 0.5 0.5 0.4 FG output L voltage : Vfgl [V] FG output L voltage : Vfgl [V] 1.8V 85℃ 0.3 25℃ -40℃ 0.2 0.1 0.4 0.3 5.0V 5.5V 0.2 0.1 0.0 0.0 0 2 4 6 FG current : Ifg [mA] 8 10 2 4 6 FG current : Ifg [mA] 8 10 Figure 14. FG output L voltage (Voltage characteristics) Figure 13. FG output L voltage (Temperature characteristics) www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 0 6/14 TSZ02201-0H1H0B100070-1-2 31.Jul.2012 Rev.002 Datasheet BU6904NUX ●Typical Performance Curves 4 1.0 Lock detection ON time : Ton [s] FG leak current : Ifgl [uA] 2.0 1.5 1.0 85℃ 0.5 25℃ 0.8 0.6 85℃ 25℃ -40℃ 0.4 0.2 -40℃ 0.0 0.0 1 2 3 4 5 Supply voltage : Vcc [V] 6 1 Figure 15. FG Output leak current 2 3 4 5 Supply voltage : Vcc [V] 6 Figure 16. Lock detection ON time Lock detection OFF time : Toff [s] 10 8 6 85℃ 25℃ -40℃ 4 2 0 1 2 3 4 5 Supply voltage : Vcc [V] 6 Figure 17. Lock detection OFF time www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 7/14 TSZ02201-0H1H0B100070-1-2 31.Jul.2012 Rev.002 Datasheet BU6904NUX ●Auto gain control Conventional FAN motor driver IC with HALL IC needs adjusting HALL bias resistor due to vary factor about HALL amplitude. This IC automatically controls HALL amplitude generated by built in HALL element and motor magnet. The result doesn’t need adjusting HALL amplitude by built in HALL element and unique AGC function. AGC function needs selecting 30ms time for HALL amp gain when turning on the power, recovering from lock protection. ●Soft switching (PWM type) Soft switching is operated using output PWM switching. The output PWM signal is generated by the slope of AGC HALL signal. The first, the AGC HALL signal is converted to absolute waveform. Next, synthesize the absolute waveform and the triangular waveform by inside IC generated. The synthesized waveform has determined PWM soft switching duty and the ratio of time. PWM soft switching time depends on motor speed. In case of HALL signal a slower, PWM soft switching time is long due to the obtuse angle of the AGC HALL signal. (PWM soft switching time is about 2ms to 4ms.) The other, in case of HALL signal a faster, PWM soft switching time is short due to the sharp slope of the AGC HALL signal. (PWM soft switching time is about 200µs to 1ms.) And, PWM soft switching frequency is 50 kHz (typical) for making triangle oscillator IC inside. (a) Convert to absolute waveform from the AGC HALL signal (b) Motor speed is slow (c) Motor speed is fast Figure 18. PWM soft switching signal synthesis www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 8/14 TSZ02201-0H1H0B100070-1-2 31.Jul.2012 Rev.002 Datasheet BU6904NUX ●Soft start function The soft start function can save output current for motor start-up. When motor starts up from stop condition, outputs are driven in about PWM 50% duty until 3 times changing magnetic direction. If the motor can’t start up using soft start function at low Vcc voltage or insufficiency motor torque, it is automatically avoided to changing full torque (Output duty 100%). (Refer to the maximum time of soft start 50% DUTY : 164ms (typical) in electrical characteristic). Figure 19. shows soft start timing chart at normal driving and insufficiency motor torque driving. (a) Normal driving (b) Low Vcc voltage or insufficiency motor torque driving (auto change full torque) Figure 19. Soft start function ●Lock protection and automatic restart Motor rotation is detected by HALL signal, and lock detection ON time (Ton) and lock detection OFF time (Toff) are set by IC internal counter. External part (C or R) is not required. Timing chart is shown in Figure 20. Magnet direction NSNSNSNS N N SNS Toff Ton SNSNSN Toff OUT1 Output Tr OFF ON OUT2 Depends on HALL signal ( L in this figure ) FG Motor locking Lock Idling ditection Lock release Recovers normal operation Figure 20. Lock protection timing chart www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 9/14 TSZ02201-0H1H0B100070-1-2 31.Jul.2012 Rev.002 Datasheet BU6904NUX ●Equivalent circuit 1) Supply voltage terminal 2) FG output terminal FG Vcc GND GND 3) Motor output terminal Vcc OUT1 OUT2 GND ●HALL position (Reference data) 2.0±0.1 3.0±0.1 0.45 0.18 HALL position (Reference data) HALL position (Reference data) 0.6MAX 1PINMARK +0.03 0.02 S 0.02 0.12 0.23 (Referencedata) 0.08 www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 S 10/14 TSZ02201-0H1H0B100070-1-2 31.Jul.2012 Rev.002 Datasheet BU6904NUX ●Safety measure 1) Reverse connection protection diode Reverse connection of power results in IC destruction as shown in Figure 21. When reverse connection is possible, reverse connection protection diode must be added between power supply and Vcc. In normal energization After reverse connection destruction prevention Reverse power connection Vcc Vcc Circuit block Vcc Circuit block Each Pin GND Circuit block Each Pin GND Internal circuit impedance high → amperage small Each Pin GND Large current flows → Thermal destruction No destruction Figure 21. Flow of current when power is connected reversely 2) Measure against Vcc voltage rise by back electromotive force Back electromotive force (Back EMF) generates regenerative current to power supply. However, when reverse connection protection diode is connected, Vcc voltage rises because the diode prevents current flow to power supply. ON ON ON Phase switching ON Figure 22. Vcc voltage rise by back electromotive force When the absolute maximum rated voltage may be exceeded due to voltage rise by back electromotive force, place (A) Capacitor or (B) Zener diode between Vcc and GND. If necessary, add both (C). (D) Capacitor and resister are improved ESD surge destruction. (A) Capacitor (B) Zener diode ON ON ON ON (C) Capacitor and Zener diode (D) Capacitor and resister ON ON ON ON Figure 23. Measure against Vcc voltage rise www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 11/14 TSZ02201-0H1H0B100070-1-2 31.Jul.2012 Rev.002 Datasheet BU6904NUX 3) Problem of GND line PWM switching Do not perform PWM switching of GND line because GND terminal potential cannot be kept to a minimum. Vcc Motor Driver M Controller GND PWM input Prohibite Figure 24. GND Line PWM switching prohibited 4) FG output FG output is an open collector and requires pull-up resistor. The IC can be protected by adding resistor R1. An excess of absolute maximum rating, when FG output terminal is directly connected to power supply, could damage the IC. Vcc Pull-up resistor FG R1 Protection resistor Connector of board Figure 25. Protection of FG terminal ●Thermal derating curve Thermal derating curve indicates power that can be consumed by IC with reference to ambient temperature. Power that can be consumed by IC begins to attenuate at certain ambient temperature. This gradient is determined by thermal resistance θja. Thermal resistance θja depends on chip size, power consumption, package ambient temperature, packaging condition, wind velocity, etc., even when the same package is used. Thermal derating curve indicates a reference value measured at a specified condition. Figure 26. shows a thermal derating curve. POWER DISSIPATION : Pd [mW] 600 500 400 300 200 100 0 0 25 50 75 100 125 150 AMBIENT TEMPERATURE : Ta [℃] Reduce by 4.1mW/℃ over 25℃. (70.0mm×70.0mm×1.6mm FR4 glass epoxy board) Figure 26. Thermal derating curve www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 12/14 TSZ02201-0H1H0B100070-1-2 31.Jul.2012 Rev.002 Datasheet BU6904NUX ●Operational Notes 1) Absolute maximum ratings Devices may be destroyed when supply voltage or operating temperature exceeds the absolute maximum ratings. Because the cause of this damage cannot be identified as a short circuit or an open circuit, if any over rated values will expect to exceed the absolute maximum ratings, consider adding circuit protection devices, such as fuses. 2) Connecting the power supply connector backward Connecting of the power supply in reverse polarity can damage IC. Take precautions when connecting the power supply lines. An external direction diode can be added. 3) Power supply line Back electromotive force causes regenerated current to power supply line, therefore take a measure such as placing a capacitor between power supply and GND for routing regenerated current. And fully ensure that the capacitor characteristics have no problem before determine a capacitor value. (when applying electrolytic capacitors, capacitance characteristic values are reduced at low temperatures) 4) GND potential It is possible that the motor output terminal may deflect below GND terminal because of influence by back electromotive force of motor. The potential of GND terminal must be minimum potential in all operating conditions, except that the levels of the motor outputs terminals are under GND level by the back electromotive force of the motor coil. Also ensure that all terminals except GND and motor output terminals do not fall below GND voltage including transient characteristics. Malfunction may possibly occur depending on use condition, environment, and property of individual motor. Please make fully confirmation that no problem is found on operation of IC. 5) Thermal design Use a thermal design that allows for a sufficient margin in light of the power dissipation(Pd) in actual operating conditions. 6) Inter-pin shorts and mounting errors Use caution when positioning the IC for mounting on printed circuit boards. The IC may be damaged if there is any connection error or if pins are shorted together. 7) Actions in strong electromagnetic field Use caution when using the IC in the presence of a strong electromagnetic field as doing so may cause the IC to malfunction. 8) ASO When using the IC, set the output transistor so that it does not exceed absolute maximum rations or ASO. 9) Thermal shut down circuit The IC incorporates a built-in thermal shutdown circuit (TSD circuit). Operation temperature is 150℃(typ.) and has a hysteresis width of 25℃(typ.). When IC chip temperature rises and TSD circuit works, the output terminal becomes an open state. TSD circuit is designed only to shut the IC off to prevent thermal runaway. It is not designed to protect the IC or guarantee its operation. Do not continue to use the IC after operation this circuit or use the IC in an environment where the operation of this circuit is assumed. 10) Testing on application boards When testing the IC on an application board, connecting a capacitor to a pin with low impedance subjects the IC to stress. Always discharge capacitors after each process or step. Always turn the IC’s power supply off before connecting it to or removing it from a jig or fixture during the inspection process. Ground the IC during assembly steps as an antistatic measure. Use similar precaution when transporting or storing the IC. 11) GND wiring pattern When using both small signal and large current GND patterns, it is recommended to isolate the two ground patterns, placing a single ground point at the ground potential of application so that the pattern wiring resistance and voltage variations caused by large currents do not cause variations in the small signal ground voltage. Be careful not to change the GND wiring pattern of any external components, either. 12) Capacitor between output and GND When a large capacitor is connected between output and GND, if Vcc is shorted with 0V or GND for some cause, it is possible that the current charged in the capacitor may flow into the output resulting in destruction. Keep the capacitor between output and GND below 100uF. 13) IC terminal input When Vcc voltage is not applied to IC, do not apply voltage to each input terminal. When voltage above Vcc or below GND is applied to the input terminal, parasitic element is actuated due to the structure of IC. Operation of parasitic element causes mutual interference between circuits, resulting in malfunction as well as destruction in the last. Do not use in a manner where parasitic element is actuated. 14) In use We are sure that the example of application circuit is preferable, but please check the character further more in application to a part which requires high precision. In using the unit with external circuit constant changed, consider the variation of externally equipped parts and our IC including not only static character but also transient character and allow sufficient margin in determining. Status of this document The Japanese version of this document is formal specification. A customer may use this translation version only for a reference to help reading the formal version. If there are any differences in translation version of this document formal version takes priority. www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 13/14 TSZ02201-0H1H0B100070-1-2 31.Jul.2012 Rev.002 Datasheet BU6904NUX ●Physical Dimension Tape and Reel Information VSON008X2030 3.0±0.1 2.0±0.1 0.6MAX 1PIN MARK TR The direction is the 1pin of product is at the upper right when you hold ( reel on the left hand and you pull out the tape on the right hand ) (0.12) +0.03 0.02 −0.02 1.5±0.1 4000pcs 0.5 1 4 8 5 0.25 1.4±0.1 0.3±0.1 C0.25 Embossed carrier tape Quantity Direction of feed S 0.08 S Tape 1pin +0.05 0.25 −0.04 Reel (Unit : mm) Direction of feed ∗ Order quantity needs to be multiple of the minimum quantity. ●Marking Diagram(s)(TOP VIEW) VSON008X2030(TOP VIEW) Part Number Marking U69 LOT Number 0 6 1PIN MARK www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 14/14 TSZ02201-0H1H0B100070-1-2 31.Jul.2012 Rev.002 Datasheet Notice Precaution on using ROHM Products 1. Our Products are designed and manufactured for application in ordinary electronic equipments (such as AV equipment, OA equipment, telecommunication equipment, home electronic appliances, amusement equipment, etc.). If you (Note 1) , transport intend to use our Products in devices requiring extremely high reliability (such as medical equipment equipment, traffic equipment, aircraft/spacecraft, nuclear power controllers, fuel controllers, car equipment including car accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or serious damage to property (“Specific Applications”), please consult with the ROHM sales representative in advance. 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The Products are not subject to radiation-proof design. 5. Please verify and confirm characteristics of the final or mounted products in using the Products. 6. In particular, if a transient load (a large amount of load applied in a short period of time, such as pulse. is applied, confirmation of performance characteristics after on-board mounting is strongly recommended. Avoid applying power exceeding normal rated power; exceeding the power rating under steady-state loading condition may negatively affect product performance and reliability. 7. De-rate Power Dissipation (Pd) depending on Ambient temperature (Ta). When used in sealed area, confirm the actual ambient temperature. 8. Confirm that operation temperature is within the specified range described in the product specification. 9. ROHM shall not be in any way responsible or liable for failure induced under deviant condition from what is defined in this document. Precaution for Mounting / Circuit board design 1. When a highly active halogenous (chlorine, bromine, etc.) flux is used, the residue of flux may negatively affect product performance and reliability. 2. In principle, the reflow soldering method must be used; if flow soldering method is preferred, please consult with the ROHM representative in advance. For details, please refer to ROHM Mounting specification Notice - GE © 2014 ROHM Co., Ltd. All rights reserved. Rev.002 Datasheet Precautions Regarding Application Examples and External Circuits 1. If change is made to the constant of an external circuit, please allow a sufficient margin considering variations of the characteristics of the Products and external components, including transient characteristics, as well as static characteristics. 2. You agree that application notes, reference designs, and associated data and information contained in this document are presented only as guidance for Products use. 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The information contained in this doc ument is provi ded on an “as is” basis and ROHM does not warrant that all information contained in this document is accurate an d/or error-free. ROHM shall not be in an y way responsible or liable for an y damages, expenses or losses incurred b y you or third parties resulting from inaccur acy or errors of or concerning such information. Notice – WE © 2014 ROHM Co., Ltd. All rights reserved. Rev.001