KA2822D

www.fairchildsemi.com KA2822D 3-Phase BLDC Motor Driver Features 3-phase, full-wave, linear BLDC motor driver with 2 hall sensors Built-in soft switching drive circuit 300 or 360 RPM speed control Snubberless Built-in chip enable function Built-in digital speed control circuit Built-in current limit circuit Index sensorless Built-in TSD (Thermal shutdown) Low saturation voltage Digital input: TTL, 5V CMOS compatible Built-in current-mode control circuit (IPEAK: 1A) Description The KA2822D is a monolithic integrated circuit, and suitable for the three-phase spindle motor driver of FDD system. 28-SSOPH-375 Typical Application 3.5-inch floppy disk drive (FDD) spildle motor Other 3-phase BLDC motor Ordering Information Device KA2822D KA2822BD Package 28-SSOPH-375 28-SSOPH-375 Operating Temp. 0 ~ 75°C 0 ~ 75°C 0 ~ 75°C 0 ~ 75°C KA2822DTF 28-SSOPH-375 KA2822BDTF 28-SSOPH-375 Rev. 1.0.1 May. 2000. ©2000 Fairchild Semiconductor International 1 KA2822D Pin Assignments FG INPUT(−) AGC INDEX PULSE WIDTH VOLTAGE REG INDEX BURST INDEX OUTPUT CE 1 2 3 4 5 6 7 28 27 26 25 24 23 22 FG INPUT(+) HALL BIAS CURRENT DETECTION1 V INPUT(−) V INPUT(+) U PHASE OUTPUT V PHASE OUTPUT FIN KA2822D FIN SIGNAL GROUND FG ZERO CROSS FG OUTPUT RPM SELECT CHARGE PUMP OUTPUT OSC INPUT NC 8 9 10 11 12 13 14 21 20 19 18 17 16 15 W PHASE OUTPUT NC U INPUT(+) U INPUT(−) CURRENT DETECTION2 VCC PHASE COMPENSATION 2 KA2822D Pin Definitions Pin Number 1 2 3 4 5 6 7 8...