TC78B027FTG,EL

TC78B027FTG TOSHIBA CDMOS Integrated Circuit Silicon Monolithic TC78B027FTG 1-Hall sine-wave PWM pre-driver for 3-phase brushless DC motors 1. Outline The TC78B027FTG is a 1-Hall sine-wave PWM controller for 3- phase brushless DC motors. N-ch MOSFET can be used as external FETs. A non-volatile memory (NVM) and a closed loop speed control function are incorporated. Cost can be suppressed without using microcontrollers. QFN24 2. Applications Fan motors (e.g. Server) 3. Features 1-Hall sine-wave PWM drive Pre-driver for external N-ch MOSFET. Closed loop speed control, configurable speed curve Adjustable driving current for the gate of external MOSFET. Operating voltage range : 5 to 16V (Electrical characteristics are not guaranteed from 5 to 9V) Serial interface Standby mode Soft start Output RPM information Protection features: Thermal ShutDown (TSD)Under Voltage LockOut (UVLO)Over Voltage Protection (OVP) Under voltage protection for the charge pumpOver Current limit Protection (OCP)Over current protection (ISD)Lock detection Start of commercial production 2019-08 2019 Toshiba Electronic Devices & Storage Corporation 1 2019-09-27 TC78B027FTG Contents 1. Outline ................................................................................................................................................ 1 2. Applications ........................................................................................................................................ 1 3. Features ............................................................................................................................................. 1 4. Block Diagram .................................................................................................................................... 4 5. Absolute Maximum Ratings (Ta = 25C) ............................................................................................. 5 6. Operating range ................................................................................................................................. 6 7. Pin Assignment (Top view) ................................................................................................................. 6 8. Pin Description ................................................................................................................................... 7 9. I/O Equivalent Circuit .......................................................................................................................... 8 10. Electrical Characteristics ................................................................................................................ 11 11. Functional Description .................................................................................................................... 14 11.1. Basic Operation ................................................................................................................................... 14 11.1.1. The IC status in each mode ..................................................................................................................15 11.1.2. 1-Hall commutation ...............................................................................................................................15 11.1.3. PWM frequency .....................................................................................................................................16 11.1.4. Lead angle control .................................................................................................................................17 11.1.5. Soft Start ...............................................................................................................................................18 11.1.6. Acceleration and deceleration control ...................................................................................................19 11.1.7. Output current for the gate of external MOSFET ..................................................................................19 11.1.8. Limitation of step of reducing rotation speed ........................................................................................20 11.2. Input / Output Signals .......................................................................................................................... 21 11.2.1. SPD .......................................................................................................................................................21 11.2.2. DIR ........................................................................................................................................................21 11.2.3. ALERT ...................................................................................................................................................22 11.2.4. HP, HM ..................................................................................................................................................23 11.2.5. FG .........................................................................................................................................................25 11.2.6. BRAKE ..................................................................................................................................................26 11.3. Speed Control ...................................................................................................................................... 27 11.3.1. Closed loop ...........................................................................................................................................27 11.3.2. Open loop ..............................................................................................................................................30 11.4. Serial I/F and NVM .............................................................................................................................. 33 11.4.1. Serial commands ..................................................................................................................................33 11.4.2. Status register .......................................................................................................................................34 11.4.3. Normal register ......................................................................................................................................35 11.4.4. Flowchart of writing Non-Volatile Memory (NVM) .................................................................................37 11.5. Protection Function.............................................................................................................................. 38 11.5.1. Fault and detection table .......................................................................................................................38 11.5.2. Lock detection .......................................................................................................................................38 2019 Toshiba Electronic Devices & Storage Corporation 2 2019-09-27