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Technical content
3-Phase Sensorless BLDC Motor Driver
DESCRIPTION
PT2431 is an integrated 12V -operationable 3 -phase sensorless BLDC motor driver with advanced protections which include soft -start circuit, thermal shutdown, lock protection and output current limit. PT2431 is specially designed for sensorless motor and ideal for fan motor control requiring high power efficiency. And a direct PWM-control interface is built in to smooth the fan speed from low to high. Peripheral devices are limited to few so that it is not difficult to make the PCB layout tight and small. PT2431 uses a new multi -power BCD technology, requiring a sin gle power supply of VDD = 5 ~12V, packed as TSSOP16 package and displaying excellent power efficiency, is a perfect solution for comprising a compact, low-cost sensorless BLDC motor system.
FEATURES
Multi-power BCD technology Direct-PWM of 20~50 KHz for fan speed control Adjustable soft-start time by an external capacitor Adjustable Lock protection time by an external capacitor Thermal protection of shutdown/release at 150 C/120C Over-current limit set by an external precision resistor FG output is offered, which gives the pulse signal as the hall sensor system
APPLICATIONS
3-phase sensorless BLDC fan motor driver Fan for CPU or graphic card Fan for server BLOCK DIAGRAM
PRE 1.2 October 2013 APPLICATION CIRCUIT TEST1 VREG2 FG3 RD4 COM5 VDD6 UO7 WO8 VO 9 RF 10 SGND 11 PWM 12 SOFT 13 GND 14 OSC 15 FR 16 5 ~ 12V PT2431 Connect to BLDC motor
PRE 1.2 October 2013 ORDER INFORMATION Valid Part Number Package Type Top Code PT2431 16-pin, HTSSOP, 173mil PT2431-HT PIN CONFIGURATION RF FR OSC UO GND PWM SGND SOFT TEST VREG COM FG WO RD VO PT2431-X PT2431-HT VDD
PRE 1.2 October 2013 PIN DESCRIPTION Pin Name I/O Description Pin No. TEST I Test mode , keep floating or low for normal operation 1 VREG IO Regulator output pin. Connect a bypass capacitor of 2.2F to ground 2 FG O Pulse output signal with open-drain structure 3 RD O Lock mode signal with open-drain structure. Hi-Z for Lock mode 4 COM I Motor middle point connection for BEMF detection reference It is an optional. 5 VDD P High voltage power supply pin 6 UO O Motor driving pin U. Connect to the U phase of motor coil Current flows in the order of U, W, V 7 WO O Motor driving pin W. Connect to the W phase of motor coil Current flows in the order of U, W, V 8 VO O Motor driving pin V. Connect to the V phase of motor coil Current flows in the order of U, W, V 9 RF O Output current sense signal Connect a 0.5 resistor to ground for 1A output current limit 10 SGND P High voltage ground signal 11 PWM I PWM input signal. 20~50KHz is allowed. 75K pull-up to VREG 12 SOFT IO Soft start control pin. Connect a capacitor of 1F to ground 13 GND P Low voltage ground signal 14 OSC IO Start-up frequency and Lock mode period setting pin Connecting a capacitor of 2200pF to ground causes 10S lock time 15 FR I Forward or reverse, change status when power off 16 Heatsink P For heat dissipation back side
PRE 1.2 October 2013 IMPORTANT NOTICE Princeton Technology Corporation (PTC) reserves the right to make corrections, modifications, enhancements, improvements, and other changes to its products and to discontinue any product without notice at any time. PTC cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a PTC product. No circuit patent licenses are implied. Princeton Technology Corp. 2F, 233-1, Baociao Road, Sindian Dist., New Taipei City 23145, Taiwan Tel: 886-2-66296288 Fax: 886-2-29174598 http://www.princeton.com.tw