DRV10866_15 Datasheet, PDF (7/22 Pages) Texas Instruments – 5V, 3Phase, Sensorless BLDC Motor Driver

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7 Detailed Description
DRV10866
SBVS206A – NOVEMBER 2012 – REVISED MARCH 2015
7.1 Overview
DRV10866 is a 3-phase, sensorless motor driver with integrated power MOSFETs with drive current capability up
to 680-mA peak. DRV10866 is specifically designed for low noise, low external component count fan motor drive
applications. DRV10866 has built-in overcurrent protection with no external current sense resistor needed. The
synchronous rectification mode of operation achieves increased efficiency for motor driver applications.
DRV10866 can output either FG or ½ FG to indicate motor speed with open-drain output through FGS pin
selection. A 150° sensorless BEMF control scheme is implemented for a 3-phase motor. Voltage surge
protection scheme prevents input V_CC capacitor from over charge during motor acceleration and deceleration
modes. DRV10866 has multiple built-in protection blocks including UVLO, overcurrent protection, lock protection
and thermal shutdown protection.
7.2 Functional Block Diagram
FG
COM
VCC
U
GND
Lock
Detection
1/2
GND
U
V _Phase
W
Select
Bandgap
FIL
PCOM
UVLO and
Clamping
VREF
Predriver
Thermal
Detection
Core
Logic
PWM and
Standby
Current
Comparator
VREF
Phase
Select
CS_S
VCC
Predriver
OSC (5 MHz)
GND
VCC
Predriver
GND
PWM
FGS
CS
V
W
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