FT3107T

FT3107T ` Three Phase Sensorless BLDC Motor Controller Description Feature The FT3107T is a Three Phase sensorless BLDC Motor  controller. It provides several drive modes (BLDC, Pseudo-BLDC, Pseudo-SINE, Narrow BLDC) Sensorless BLDC/Pseudo-BLDC /Pseudo-SINE/Narrow BLDC drives with  constant/variable lead angle intended for a wide range of Two speed adjustment methods can be selected (direct-PWM and analog voltage control) motor characteristics. Open/Closed loop speed adjustment  Intelligent Soft-start can be achieved through either direct-PWM or analog  Constant/Variable lead angle control voltage or frequency control, initiated by soft-start.  Open/Closed loop speed adjustment can be selected Speed indicator is provided through a Frequency Generator output, (direct-PWM and analog voltage control). generating digital pulse with a configurable frequency  FG (Frequency Generator) output proportional to the speed of the motor.  Current limit protection Protection functions of FT3107T are comprehensive  Built-in lock protection and automatic recovery circuit including lock protection and automatic recovery, thermal  Built-in thermal shutdown protection (TSD) shutdown and current limit protections. These prevent the control circuits and the motor from being damaged, particularly under stressed applications and demanding environments. Block Diagram VDD5 VREG10 VCC FG VSS LDO FR BRAKE SPEED/PWM ADC xa Control Engine TM High Side Driver UH VH WH Low Side Driver UL VL WL ILIMIT ISENSE TSD UVLO ADC Lock Protection BEMF EMF_U EMF_V EMF_W www.fortiortech.com FT3107T ` Pin Assignment VSS VDD5 TM BRAKE SPEED/PWM FR ILIMIT FG EMFW EMFV 1 2 3 4 5 6 7 8 9 10 FT 3107 20 19 18 17 16 15 14 13 12 11 VCC VREG10 UH VH WH UL VL WL ISENSE EMFU Pin Configuration PIN PIN Name Type 1 VSS GND 2 VDD5 O Digital power output, LDO DC5V output for digital signal. 3 TM I TEST PIN， Floating or connect to VDD5 4 BRAKE I Brake signal input, Low: Brake. Internal pull-up. 5 SPEED/PWM I Speed control input 6 FR I Motor rotation direction input 7 ILIMIT I Current limit analog input 8 FG O Open drain. Frequency Generator, speed signal output. 9 EMF_W I Phase W back EMF. 10 EMF_V I Phase V back EMF. 11 EMF_U I Phase U back EMF. 12 ISENSE I Current limit & Lead angle analog input 13 WL O Low side phase W NMOS driver 14 VL O Low side phase V NMOS driver 15 UL O Low side phase U NMOS driver 16 WH O High side phase W PMOS driver 17 VH O High side phase V PMOS driver 18 UH O High side phase U PMOS driver 19 VREG10 O LDO output 20 VCC POWER NO. REV 1.0 Description Signal and power ground. Power supply 2 / 10 FT-DS-021A FT3107T ` Absolute Maximum Ratings Stresses exceeding the absolute maximum ratings may damage the device. The device may be damaged or may not function or be operational above these ratings and stressing the device to/above these levels is not recommended. Fortior does not recommend exceeding or designing about the Absolute Maximum Ratings. Parameter Symbol Ratings Unit 30.0 V FG output current Vccmax IFGmax 10 mA FG output pin withstand voltage VFG max 5.5 V Topr Tstg -40~+125 ℃ -65~+150 ℃ 100 ℃/W Power supply voltage Operating temperature Storage temperature Package Thermal Resistance， Junction to Ambient Rθja Condition 4-layer PCB based on JEDEC standard Recommended Operating Conditions The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Symbol Power supply voltage REV 1.0 Parameter Min. Typ. Max. Unit Vcc 3.7 12 28 V 3 / 10 FT-DS-021A FT3107T ` Electrical Characteristics Unless otherwise specified, Ta=25℃，VCC=12V Parameter Symbol Power supply current Icc Condition Ratings Min. Unit Typ. Max. 8 15 mA 5 5.1 V 10 mA 10.5 V 10 mA 0 5.3 V Working VDD5 LDO Regulator voltage VDD5 Regulator output current Iv5out 4.9 VDD5=5V 10V Regulator Block Regulator voltage Vreg10 Regulator output current Iv10out 9.5 10.0 Vreg10=10V Analog I/O Section*Note1 Analog Input range Digital Input Section*Note2 High-level input voltage Vdinh 2.5 5.3 V Low-level input voltage Vdinl 0 2 V Internal pull up resistor Rdio 50k 150k ohm Fpwm 1 60 kHz 100k SPEED – PWM DIGITAL MODE PWM input frequency HP(High Side PMOS Driver) *Note3 Output high voltage HVoh Sink current = 20mA Output low voltage HVol Source current = 20mA 11.2 11.5 12 V - 3 5 V Source Current Io+ - 150 - mA Sink Current Io- - 90 - mA 8.5 10 11 V - 0 0.3 V LN(Low Side NMOS Driver) *Note4 Output high voltage LVoh Sink current = 20mA Output low voltage LVol Source current = 20mA Source Current Io+ - 150 - mA Sink Current Io- - 180 - mA - 0.1 0.2 V FG Output Pin FG output pin low-level voltage VFG When Io=5mA TSD Design target 150 ℃ △TSD Design target 30 ℃ Thermal Protection Circuit Thermal protection circuit operating temperature Temperature hysteresis width 1. Note1: SPEED、ILIMIT、EMF_U、EMF_V、EMF_W、ISENSE. 2. Note2: BRAKE、PWM、FR. 3. Note3: UH、VH、WH 4. Note4: UL、VL、WL REV 1.0 4 / 10 FT-DS-021A FT3107T ` Functional Description and Notes Please read the following notes before designing driver circuits with FT3107T. 1. Drive Mode FT3107T can be programmed to drive the motor with different drive modes, BLDC/Pseudo-BLDC/Pseudo-SINE/ Narrow BLDC. BLDC is driven at 120 degrees pulse width, Pseudo BLDC is driven at an increased pulse width with edges of the width superimposed with PWM. BLDC. This mode is useful where acoustic noise is a concern over Under some conditions, for acoustic noise reduction, Pseudo Sine can be used where the motor is driven sinusoidally except for a single window for back-EMF detection. In the event where the flyback current is large, narrow BLDC can be use where the pulse width is smaller and flyback current pulse can be accommodated for. 2. Speed Control Methods FT3107T has two methods to control speed, through direct digital PWM input or analog voltage input. PWM input is used, PWM input duty direct input to control speed. If digital If analog voltage speed control is used, the voltage seen at SPEED will generate an internal PWM with its duty cycle determined by the following equation: Duty _ cycle  VSPEED  0.5 4 The selection of digital PWM input control or analog voltage is done through efuse. 3. Closed loop speed control Closed loop speed control can be is controlled through the duty cycle of the digital input PWM or the voltage level of the analog input PWM. Additional efuses (VLOW and VRANGE) together with SMIN_DUTY can be set in order to achieve the speed profiles. This is achieved using an internal PI loop with its proportional and integral gains configurable through efuses. 4. Frequency Generator Function The Frequency Generator output generates a rotation pulse providing information about the speed of motor. It can be programmed using internal efuse to give 2 mechanical rotation for motor pole pairs ranging from 2-8, or 1-3 per electrical rotation. The default setting is 1 pulse per electrical degree. The FG pin is an open drain output, which is to be connected to a logical voltage level through an external pull-up resistor when used. This pin can be left open if unused. 5. EMF Feedback EMF_U\ EMF_V\ EMF_W are motor back-EMF inputs and must be proportionately stepped down to less than VDD5 for protection of the IC. 6. Brake Function FT3107T comes with brake function. Braking operates intelligently for protective purpose. When BRAKE pin is set low, if the motor is rotating above the brake threshold speed, output MOSFETs will be turned off to slow down the motor. However, if the motor is rotating below the brake threshold speed, and the lower legs of the output MOSFETs will be turned on to brake the motor. The reason for this distinction is to protect the MOSFETs from excessive braking currents due to large back-EMF. REV 1.0 5 / 10 FT-DS-021A FT3107T ` 7. Lead Angle Correction The lead angle of generated motor driving signal related to the induced magnetic voltage can be shifted by an angle between 0 and 15 degrees. Lead angle control can be achieved by directly applying a voltage to the ISENSE pin. Lead angle 1° Lead angle 0° ISENSE = 0 V LA = 330 mV(typ.） ISENSE(V)vs. Lead Angle(°) 15 Lead Angle (°) 12 9 6 3 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 ISENSE (V) Figure 1 ISENSE vs Lead Angle Step ISENSE (V) Step ISENSE(V) 0.00 Lead angle(°) 0.00 Step ISENSE (V) 2.00 Lead angle(°) 6.00 12 4.00 Lead angle(°) 12.00 0 6 1 0.33 1.00 7 2.33 7.00 13 4.33 13.00 2 0.66 2.00 8 2.66 8.00 14 4.66 14.00 3 1.00 3.00 9 3.00 9.00 15 5.00 15.00 4 1.33 4.00 10 3.33 10.00 5 1.66 5.00 11 3.66 11.00 8. Lockup Protection and Automatic Restart If motor rotation is abnormal, the internal detection circuit starts self-locking detection for a given number of cycles (Trun). If the motor rotation is abnormal for Trun cycles, the lock-up protection circuit will disable the driver (by setting its outputs to high-impedance) in order to prevent the motor coil from burnout. (Twait)”, the lock-up protection is released and normal operation resumes. another time period, Trun, lock-up protection will once again be triggered. After a “waiting time Similarly if rotation is abnormal for Twait and Trun timings are configurable with internal efuse and can be modified by user. REV 1.0 6 / 10 FT-DS-021A FT3107T ` Abnormal state Normal run Normal run OUTPUT Trun Figure2 Trun Twait Twait Lockup Protection and Automatic Restart 9. Current Protection There are two methods of current protection: overload current protection and cycle by cycle current protection. Cycle by cycle current protection is only available for BLDC. The overload current protection and cycle by cycle current protection of the motor is selected by setting internal efuse The current limit circuit limits the output current peak value to a level determined by the equation: I  Vref / RISENSE For the overload current protection mode, the current limit circuit detects the peak current of the output transistors at the ISENSE pin and will reduce the duty cycle of PWM. For the cycle by cycle current protection mode, when the voltage at the ISENSE input is higher than VREF, the current limit protection is generated and the output PWM will be turned off. PWM cycle. Being cycle by cycle, it is reset every The VREF voltage can be selected to internal voltage or ILIMIT pin input analog voltage using efuse. VERF(ILIMIT) ISESN PWM Cycle by cycle Figure 3 Fault protection Cycle by cycle current protection mode 10. Thermal Protection. FT3107T has a built in thermal shunt down function, which will shut down the device when the junction temperature is over 150°C and will resume operating when the junction temperature drops back to 120°C. REV 1.0 7 / 10 FT-DS-021A FT3107T ` Application Circuit Example VCC VDD5 FG VREG10 VCC VSS LDO F/R SPEED/PWM ADC xa Control Engine TM BRAKE High Side Driver UH VH WH Low Side Driver UL VL WL W V U M ILIMIT ISENSE TSD UVLO ADC Lock Protection BEMF EMF_U REV 1.0 EMF_V EMF_W 8 / 10 FT-DS-021A FT3107T ` Package Information TSSOP-20 MIN NOM MAX A - - 1.20 A1 0.05 - 0.15 A2 0.80 1.00 1.05 b 0.19 - 0.30 b1 0.19 0.22 0.25 c 0.09 - 0.20 c1 0.09 - 0.16 D 6.40 6.50 6.60 E 6.20 6.40 6.60 E1 4.30 4.40 4.50 e 0.65BSC L 0.45 L1 0.60 0.75 1.00BSC Part Number Package Type Marking ID Package Method Quantity FT3107T TSSOP20 FT3107T TUBE 50 REV 1.0 9 / 10 FT-DS-021A FT3107T ` Copyright Notice Copyright by Fortior Technology (Shenzhen) Co., Ltd. All Rights Reserved. Right to make changes —Fortior Technology (Shenzhen) Co., Ltd reserves the right to make changes in the products - including circuits, standard cells, and/or software - described or contained herein in order to improve design and/or performance. The information contained in this manual is provided for the general use by our customers. Our customers should be aware that the personal computer field is the subject of many patents. Our customers should ensure that they take appropriate action so that their use of our products does not infringe upon any patents. It is the policy of Fortior Technology (Shenzhen) Co., Ltd. to respect the valid patent rights of third parties and not to infringe upon or assist others to infringe upon such rights. This manual is copyrighted by Fortior Technology (Shenzhen) Co., Ltd. You may not reproduce, transmit, transcribe, store in a retrieval system, or translate into any language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical, manual, or otherwise, any part of this publication without the expressly written permission from Fortior Technology (Shenzhen) Co., Ltd. Fortior Technology (Shenzhen) Co.,Ltd. Room203, 2/F, Building No.11, Keji Central Road2, Software Park, High-Tech Industrial Park, Shenzhen, P.R. China 518057 Tel: 0755-26867710 Fax: 0755-26867715 URL: http://www.fortiortech.com Contained herein Copyright by Fortior Technology (Shenzhen) Co.,Ltd all rights reserved. REV 1.0 10 / 10 FT-DS-021A