Datasheet DC Brushless Fan Motor Drivers Multifunction Single-phase Full-wave Fan Motor Driver BD6974FV General description Package W (Typ.) x D (Typ.) x H (Max.) BD6974FV is a pre-driver that controls the motor drive SSOP-B16 5.00mm x 6.40mm x 1.35mm part composed of the power transistors. Moreover, a lot of functions are installed, and the pin is compatible with BD6973FV(rotation speed pulse signal output). Features Pre-driver for external power transistors Speed controllable by DC / direct PWM input PWM soft switching Soft start Quick start Current limit Lock protection and automatic restart SSOP-B16 Lock alarm signal (AL) output Application Fan motors for general consumer equipment of desktop PC, and Server, 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 High side output voltage Voh 36 V Low side output voltage Vol 15 V Low side output current Iol 10 mA Lock alarm signal (AL) output voltage Val 20 V Lock alarm signal (AL) output current Ial 10 mA Reference voltage (REF) output current Iref 12 mA Hall bias (HB) output current Ihb 12 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) Recommended operating conditions Parameter Symbol Limit Unit Operating supply voltage range Vcc 4.3 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 TSZ02201-0H1H0B100200-1-2 2012 ROHM Co., Ltd. All rights reserved. 1/13 TSZ2211114 001 28.JUL.2012 Rev.002DatasheetDatasheet BD6974V Pin configuration Pin description P/No. T/Name Function (TOP VIEW) 1 AL Lock alarm signal output terminal Oscillating capacitor connecting AL 1 16 GND 2 OSC terminal 3 MIN Minimum output duty setting terminal OSC 2 15 H 4 TH Output duty controllable input terminal MIN 3 14 HB 5 REF Reference voltage output terminal 6 Vcc Power supply terminal TH 4 13 H+ 7 A1H High side output terminal 1 8 A1L Low side output terminal 1 REF 5 12 SS 9 A2L Low side output terminal 2 10 A2H High side output terminal 2 Vcc 6 11 CS 11 CS Output current detection terminal A1H 7 10 A2H Soft start capacitor connecting 12 SS terminal A1L 8 9 A2L 13 H+ Hall + input terminal 14 HB Hall bias terminal Fig.1 Pin configuration 15 H Hall input terminal 16 GND Ground terminal Block diagram AL SIGNAL PWM SOFT GND 1 TSD 16 OUTPUT SWITCHING HALL AMP OSC H 2 15 OSC HALL COMP PWM MIN HALL HB COMP 3 14 BIAS CONTROL PWM LOGIC COMP TH H+ LOCK 4 13 PROTECT QUICK Vcl START REF 5 12 SS REF Vcc SOFT START & CURRENT LIMIT COMP CS 6 11 Vcc PRE- DRIVER A1H A2H REG REG 7 10 A1L A2L 8 9 Fig.2 Block diagram I/O truth table Hall input Driver output H+ H A1H A1L A2H A2L H L Hi-Z H L L L H L L Hi-Z H H High, L Low, Hi-Z High impedance Motor state AL Rotating L Locking Hi-Z L Low, Hi-Z High impedance AL output is open-drain type. www.rohm.com TSZ02201-0H1H0B100200-1-2 2012 ROHM Co., Ltd. All rights reserved. 2/13 TSZ2211115 001 28.JUL.2012 Rev.002