Datasheet DC Brushless Fan Motor Drivers Multifunction Single-phase Full-wave Fan Motor Driver BD6971FV General description Package W (Typ.) x D (Typ.) x H (Max.) BD6971FV is a 1chip driver that composes H-bridge of SSOP-B14 5.00mm x 6.40mm x 1.35mm power DMOS FET. It is possible to correspond to a small motor by starting from 3.5V and installing in the SSOP small package. Features SSOP small package Driver including power DMOS FET Speed controllable by DC / direct PWM input PWM soft switching Quick start Current limit Lock protection and automatic restart SSOP-B14 Rotation speed pulse signal (FG) output Application Fan motors for general consumer equipment of desktop PC, and Projector, etc. Absolute maximum ratings Parameter Symbol Limit Unit Supply voltage Vcc 20 V *1 Power dissipation Pd 874.7 mW Operating temperature range Topr 40 to +100 C Storage temperature range Tstg 55 to +150 C Output voltage Vo 20 V *2 Output current Io 1.0 A Rotation speed pulse signal (FG) output voltage Vfg 20 V Rotation speed pulse signal (FG) output current Ifg 10 mA Reference voltage (REF) output current Iref 5 mA Hall bias (HB) output current 1 Ihb1 5 mA *3 Hall bias (HB) output current 2 Ihb2 10 mA Input voltage (H+, H, TH, MIN, CS) Vin 7 V Junction temperature Tj 150 C *1 Reduce by 7.0mW/C over Ta=25C. (On 70.0mm70.0mm1.6mm glass epoxy board) *2 This value is not to exceed Pd. *3 The condition of Ta=25C and Vcc=12V Recommended operating conditions Parameter Symbol Limit Unit Operating supply voltage range Vcc 3.5 to 17.0 V Operating input voltage range 1 (H+, H) 0 to 7 V (more than Vcc=9V) Vin1 Operating input voltage range 1 (H+, H) 0 to Vcc2 V (less than Vcc=9V) Operating input voltage range 2 (TH, MIN) Vin2 0 to Vref V Product structureSilicon monolithic integrated circuit This product is not designed protection against radioactive rays www .rohm.com TSZ02201-0H1H0B100150-1-2 2012 ROHM Co., Ltd. All rights reserved. 1/12 TSZ2211114 001 28.JUL.2012 Rev.002DatasheetDatasheet BD6971FV Pin configuration Pin description P/No. T/Name Function (TOP VIEW) 1 FG Speed pulse signal output terminal 2 H Hall input terminal FG 1 14 GND 3 HB Hall bias terminal 4 H+ Hall + input terminal H 2 13 OSC 5 CS Output current detection terminal HB 3 12 MIN 6 OUT2 Motor output terminal 2 Output current detecting resistor 7 RNF H+ 4 11 TH connecting terminal (motor ground) 8 OUT1 Motor output terminal 1 CS 5 10 REF 9 Vcc Power supply terminal 10 REF Reference voltage output terminal OUT2 6 9 Vcc 11 TH Output duty controllable input terminal RNF 7 8 OUT1 12 MIN Minimum output duty setting terminal Oscillating capacitor connecting 13 OSC Fig.1 Pin configuration terminal 14 GND Ground terminal (signal ground) Block diagram FG GND SIGNAL PWM SOFT 1 14 TSD OUTPUT SWITCHING HALL AMP H OSC 2 OSC 13 HALL COMP PWM HB HALL MIN COMP 3 12 CONTROL BIAS LOGIC PWM COMP H+ TH LOCK 4 11 PROTECT Vcl QUICK START CS REF 5 10 CURRENT LIMIT COMP PRE- REF DRIVER OUT2 Vcc 6 9 RNF OUT1 7 8 Fig.2 Block diagram I/O truth table Hall input Driver output H+ H OUT1 OUT2 FG H L L H Hi-Z L H H L L H High, L Low, Hi-Z High impedance FG output is open-drain type. www.rohm.com TSZ02201-0H1H0B100150-1-2 2012 ROHM Co., Ltd. All rights reserved. 2/12 TSZ2211115 001 28.JUL.2012 Rev.002