Datasheet DC Brushless Fan Motor Drivers Multifunction Single-phase Full-wave Fan Motor Driver BD6971FS General description Package W (Typ.) x D (Typ.) x H (Max.) BD6971FS is a 1chip driver that composes H-bridge of SSOP-A16 6.60mm x 6.20mm x 1.71mm power DMOS FET. Moreover, it is possible to correspond to 5V class motor because it starts from 3.5V. Features Driver including power DMOS FET Speed controllable by DC / direct PWM input PWM soft switching Quick start Current limit Lock protection and automatic restart Rotation speed pulse signal (FG) output SSOP-A16 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 812.5 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 6.5mW/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 TSZ02201-0H1H0B100160-1-2 2012 ROHM Co., Ltd. All rights reserved. 1/12 TSZ2211114 001 28.JUL.2012 Rev.002DatasheetDatasheet BD6971FS 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 16 GND 3 HB Hall bias terminal 4 H+ Hall + input terminal H 2 15 OSC 5 CS Output current detection terminal HB 3 14 MIN 6 N.C. Non-connecting terminal 7 OUT2 Motor output terminal 2 H+ 4 13 TH Output current detecting resistor 8 RNF connecting terminal (motor ground) CS 5 12 REF 9 N.C. Non-connecting terminal 10 OUT1 Motor output terminal 1 N.C. 6 11 Vcc 11 Vcc Power supply terminal OUT2 7 10 OUT1 12 REF Reference voltage output terminal 13 TH Output duty controllable input terminal RNF 8 9 N.C. 14 MIN Minimum output duty setting terminal Oscillating capacitor connecting Fig.1 Pin configuration 15 OSC terminal 16 GND Ground terminal (signal ground) N.C. must open on the substrate pattern, because this is a non-connecting terminal in IC. Block diagram FG SIGNAL PWM SOFT GND 1 16 TSD OUTPUT SWITCHING HALL AMP H OSC 2 OSC 15 HALL COMP PWM HB MIN HALL COMP 3 14 CONTROL BIAS LOGIC PWM COMP H+ LOCK TH 4 13 PROTECT Vcl QUICK START CS REF 5 12 CURRENT LIMIT COMP PRE- REF DRIVER N.C. Vcc 6 11 OUT2 OUT1 7 10 RNF N.C. 8 9 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 TSZ02201-0H1H0B100160-1-2 2012 ROHM Co., Ltd. All rights reserved. 2/12 TSZ2211115 001 28.JUL.2012 Rev.002