FT3206

FT3206D FT3206D Three Phase Sine-wave Sensorless Motor Driver Overview Feature The FT3206D is a three-phase sensorless brushless DC motor driver IC designed for low noise and low voltage applications.It drives the motor sinusoidally, giving low noise performance. The FT3206D has useful functions such as start-up circuit, Pulse Width Modulation (PWM) speed control, RD\FG output for different control applications, as well as protective features such as lock and thermal protection. FT3206D is best suited for silent applications such as game consoles or CPU fans. It is available in DFN3x310 package. Protection functions of FT3206D are comprehensive, including lock protection and automatic recovery, thermal shutdown. These prevent the control circuits and the motor from being damaged, particularly under ⚫ Three-Phase class Sine-wave driver method ⚫ Three-Phase Sensor-Less Drive Method ⚫ Built-In External PWM Speed Control ⚫ Built-In Quick Start Function ⚫ FG (Rotation Speed Detection) Output ⚫ RD (Rotation Detection) Output ⚫ Soft Switching Circuit (for Noise reduction) ⚫ Power Saving Function (when input PWM Duty Cycle is (0%) ⚫ Built-In Lock Protection and Auto Restart Function ⚫ Built-in thermal shutdown protection (TSD) ⚫ FG division for different pole paired motors ⚫ I2C interface for parameter setting and internal OTP write support ⚫ Low Rds (0.7Ω) stressed applications and demanding environments. Block Diagram RD OTP FG I2C VCC FR PWM_POWER_SAVE LOGIC LDO_1.8V PreDriver PWM UO VO WO POR xa Protection OSC GND BEMF www.fortiortech.com COM FT3206D 1. Pin Assignment Package：DFN10 (3x3) GND COM PWM FR FG 1 2 3 4 5 10 9 8 7 6 VO UO WO VCC RD = Thermal Pad （connect to the GND plane for better heat dissipation） Table 1 Pin Configuration Pin No. Pin Name I/O 1 GND GND 2 COM I Motor Neutral Point Input Pin 3 PWM I PWM Signal Input Pin. Input PWM signal to control rotation speed. 4 FR I Motor Spin Direction Control Pin. 5 FG O Rotation Speed Output. 6 RD I Rotation Detection Output. 7 VCC POWER Supply Voltage Input Pin. 8 WO O Driver Output Pin. Output signal for driving motor phase W. 9 UO O Driver Output Pin. Output signal for driving motor phase U. 10 VO O Driver Output Pin. Output signal for driving motor phase V. REV 1.3 Description Ground Pin 2 www.fortiortech.com FT3206D 2. Absolute Maximum Ratings (@Ta=25℃) 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. Table 2 Parameter Symbol Condition Ratings Unit Power supply voltage VCC max 7 V Output current IOUT max 1 A Driver output pin withstand voltage Vmot max 7 V Logic input pin withstand voltage Vlogic max 7 V RD/FG output pin withstand voltage VRD/FG max 7 V RD/FG output current IRD/FG max 10 mA Operating temperature Topr -40 ~ +105 ℃ Storage temperature Thermal Resistance-Junction Tstg -65 ~ +150 ℃ to AmbientNOTE1 θJA 93 ℃/W Case NOTE2 θJC 42 ℃/W Thermal Resistance-Junction to NOTE1：θJA is measured with the component mountend on a 76.2mm × 114.3mm × 1.6mm glass epoxy board (one-layer) in free air, NOTE2：The junction-to-case thermal resistance is obtained by simulatinga cold plate test on the exposed (power) pad. No specificJEDEC standard test exists,but a close description can be found in the ANSI SEMI standard G30-88. 3. Recommended Operating Conditions Table 3 Parameter Power supply voltage Output current REV 1.3 Symbol Condition VCC IO UO/VO/WO Average Output Current 3 Ratings Unit 2~6 V 0~500 mA www.fortiortech.com FT3206D 4. Electrical Characteristics Table 4 (Unless otherwise specified, Ta = 25℃, VCC = 5 V) Parameter Symbol Condition Ratings Min. Typ. Max. Unit Power supply current 1 ICC1 Working current - 5 - mA Power supply current 2 ICC2 Standby current - 100 - uA Output Block High-side switch ON resistance Ron (H) IO = 0.5A - 0.4 0.7 Ω Low-side switch ON resistance Ron (L) IO = 0.5A - 0.3 0.5 Ω Digital I/O Section — PWM、FR Digital high-level input voltage Vdinh - 3.0 - VCC+0.3 V Digital low-level input voltage Vdinl - -0.3 - 0.8 V PWM High Input Current IPWMH PWM=VCC - 0 - uA PWM Low Input Current IPWML PWM=GND - 7 - uA Digital I/O internal pull up resistor Rdio - - 70k - ohm PWM Input Frequency FPWM 0.2 - 50 kHz - 0.1 0.2 V - 5 - s RD/FG Output Pin RD/FG output low-level voltage LOCK VRDFG When IO = 5 mA PRPTECTION NOTE2 Lock Detection Off Time TOFF Thermal Protection Circuit Thermal protection circuit operating temperature Temperature hysteresis width TSD Design target - 165 - ℃ ΔTSD Design target - 30 - ℃ NOTE：Lock detection on time depend on UI setting. REV 1.3 4 www.fortiortech.com FT3206D 5. Operating Waveforms Rotation Waveform (PWM=100%) CH1: VUO, 5V/div, DC ; CH2: VVO, 5V/div, DC; CH3: VWO, 5V/div, DC; CH4: IUO, 200mA/div, DC Rotation Waveform (PWM=50%) CH1: VUO, 5V/div, DC ; REV 1.3 CH2: VVO, 5V/div, DC; CH3: VWO, 5V/div, DC; CH4: IUO, 200mA/div, DC 5 www.fortiortech.com FT3206D 6. Functional Description and Notes Please read the following notes before designing driver circuits with FT3206D. Starting Starting of the motor is triggered by the detection of PWM signal and the IC injects a configurable starting commutation frequency to the motor. During this commutation, BLDC drive is used so as to detect back-EMF from the silent windows. After the IC has detected a stable back-EMF, it transits to SINE drive. Dual Start The IC adopts a strategy of dual starting. The IC will first be injected with a configurable commutable frequency for back-EMF detection. If a stable back-EMF is detected, it will transit to SINE drive. Upon detection of unstable back-EMF, the starting sequence will be immediately restarted, providing a consecutive/extended starting commutation. This aims to increase and improve the stability of the starting back-EMF PWM Speed Control The IC accepts a wide range of PWM input frequency from 200Hz to 50 kHz for motor speed control. The input PWM is translated to an output PWM fixed at a frequency of 30 kHz, away from the audible frequency range. Figure 1 PWM Input Waveform Quick Start This IC disables the lock protection function when the PWM input keeps low level for more than 16ms. (SeeFigure 2 Quick Start Waveform) Figure 2 Quick Start Waveform Pseudo-sine Output The IC switches from BLDC to PSEUDO-SINE output after the back-EMF signals are stable. Under PSEUDO-SINE drive, the IC opens only a window for back-EMF detection while the rest of the cycle is driven sinusoidally. For the realization of the sine drive, SVPWM is being used. REV 1.3 6 www.fortiortech.com FT3206D FG Output The FG pin is configurable to different multiples of the electrical motor frequency to accommodate for different pole paired motors. A square wave signal is provided to the open-drain output. Being an open-drain, a pull-up resistor is necessary for proper operation of the output. Lock Protection and Automatic Recovery The IC has lock protection and configurable recovery function for both motor and IC protection. Upon detection of a lock condition or a detached motor terminal condition, the IC goes into a gate turn off condition. This will persist for 5secs before the IC is re-started. The number of times of re-starting is configurable to either 0, 1, 3 or 9 depending on application. Thermal Protection The IC has thermal protection function. When internal junction temperature reaches 160℃, the IC goes into gate turn off condition. As soon as the temperature drops to 130℃, the IC will do an internal reboot and starting sequence will commence. REV 1.3 7 www.fortiortech.com FT3206D 7. Application Circuit Example VIN D1 RD VCC R1 C1 FG 1~2Ω 2.2uF UO 1k VO FR WO 1k PWM C2 C3 C4 COM GND 0~22nF Note1: D1 is to prevent the damage from the power reverse connection. Note2: R1 and C1 are for power supply filtering function, and must be placed as close to IC as possible. Note3: C2~C4 are optional. It depends on the performance of the motor 8. Package Information DFN10（3x3 mm） REV 1.3 8 www.fortiortech.com FT3206D Part Number Package Type Marking ID Package Method Quantity FT3206D DFN10 FT3206D Tray 624 Maximum Power Dissipation (mW) Maximum Power Dissipation vs. Ambient Temperature 1000 800 600 400 200 0 25 50 75 100 125 150 Ambient Temperature (℃) REV 1.3 9 www.fortiortech.com FT3206D 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 1.3 10 www.fortiortech.com