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BD6971FV Dataheets PDF



Part Number BD6971FV
Manufacturers Rohm
Logo Rohm
Description Multifunction Single-phase Full-wave Fan Motor Driver
Datasheet BD6971FV DatasheetBD6971FV Datasheet (PDF)

Datasheet DC Brushless Fan Motor Drivers Multifunction Single-phase Full-wave Fan Motor Driver BD6971FV ●General description BD6971FV is a 1chip driver that composes H-bridge of power DMOS FET. It is possible to correspond to a small motor by starting from 3.5V and installing in the SSOP small package. ●Package SSOP-B14 W (Typ.) x D (Typ.) x H (Max.) 5.00mm x 6.40mm x 1.35mm ●Features „ SSOP small package „ Driver including power DMOS FET „ Speed controllable by DC / direct PWM input „ PWM .

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Datasheet DC Brushless Fan Motor Drivers Multifunction Single-phase Full-wave Fan Motor Driver BD6971FV ●General description BD6971FV is a 1chip driver that composes H-bridge of power DMOS FET. It is possible to correspond to a small motor by starting from 3.5V and installing in the SSOP small package. ●Package SSOP-B14 W (Typ.) x D (Typ.) x H (Max.) 5.00mm x 6.40mm x 1.35mm ●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 „ Rotation speed pulse signal (FG) output SSOP-B14 ●Application „ Fan motors for general consumer equipment of desktop PC, and Projector, etc. ●Absolute maximum ratings Parameter Symbol Limit Supply voltage Power dissipation Vcc 20 Pd 874.7 *1 Operating temperature range Topr –40 to +100 Storage temperature range Tstg –55 to +150 Output voltage Output current Vo 20 Io 1.0 *2 Rotation speed pulse signal (FG) output voltage Vfg 20 Rotation speed pulse signal (FG) output current Ifg 10 Reference voltage (REF) output current Iref 5 Hall bias (HB) output current 1 Hall bias (HB) output current 2 Ihb1 Ihb2 5 10 *3 Input voltage (H+, H–, TH, MIN, CS) Vin 7 Junction temperature Tj 150 *1 Reduce by 7.0mW/°C over Ta=25°C. (On 70.0mm×70.0mm×1.6mm glass epoxy board) *2 This value is not to exceed Pd. *3 The condition of Ta=25°C and Vcc=12V Unit V mW °C °C V A V mA mA mA mA V °C ●Recommended operating conditions Parameter Operating supply voltage range Operating input voltage range 1 (H+, H–) (more than Vcc=9V) Operating input voltage range 1 (H+, H–) (less than Vcc=9V) Operating input voltage range 2 (TH, MIN) Symbol Vcc Vin1 Vin2 Limit 3.5 to 17.0 0 to 7 0 to Vcc–2 0 to Vref Unit V V V V ○Product structure:Silicon monolithic integrated circuit www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・14・001 ○This product is not designed protection against radioactive rays 1/12 TSZ02201-0H1H0B100150-1-2 28.JUL.2012 Rev.002 BD6971FV Datasheet ●Pin configuration FG H– HB H+ CS OUT2 RNF 1 2 3 4 5 6 7 (TOP VIEW) 14 GND 13 OSC 12 MIN 11 TH 10 REF 9 Vcc 8 OUT1 Fig.1 Pin configuration ●Pin description P/No. T/Name 1 FG 2 H– 3 HB 4 H+ 5 CS 6 OUT2 7 RNF 8 OUT1 9 Vcc 10 REF 11 TH 12 MIN 13 OSC 14 GND Function Speed pulse signal output terminal Hall – input terminal Hall bias terminal Hall + input terminal Output current detection terminal Motor output terminal 2 Output current detecting resistor connecting terminal (motor ground) Motor output terminal 1 Power supply terminal Reference voltage output terminal Output duty controllable input terminal Minimum output duty setting terminal Oscillating capacitor connecting terminal Ground terminal (signal ground) ●Block diagram 1 FG 2 H– 3 HB SIGNAL OUTPUT H AL L AMP H AL L COMP HALL BIAS 4 H+ Vcl LOCK PROTECT 5 CS CURRENT LIMIT COMP 6 OUT2 PWM SOFT SWITCHING TSD OSC CONTROL LOGIC PWM COMP PWM COMP QUICK START PREDRIVER REF GND 14 OSC 13 MIN 12 TH 11 REF 10 Vcc 9 7 RNF OUT1 8 Fig.2 Block diagram ●I/O truth table Hall input Driver output H+ H– OUT1 OUT2 HL LH L HH H; High, L; Low, Hi-Z; High impedance FG output is open-drain type. L FG Hi-Z L www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 2/12 TSZ02201-0H1H0B100150-1-2 28.JUL.2012 Rev.002 BD6971FV Datasheet ●Electrical characteristics(Unless otherwise specified Ta=25°C, Vcc=12V) Parameter Limit Symbol Unit Min. Typ. Max. Conditions Circuit current Icc 3 5 8 mA Hall input hysteresis + voltage Vhys+ 4 9 16 mV Hall input hysteresis – voltage Vhys– –18 –13 –8 mV Output voltage Io=±200mA, Vo - 0.6 0.9 V High and low side total Lock detection ON time Ton 0.3 0.5 0.7 s Lock detection OFF time Toff 3.0 5.0 7.0 s FG output low voltage Vfgl - 0.15 0.30 V Ifg=2mA FG output leak current Ifgl - - 10 µA Vfg=17V OSC high voltage Vosch 2.3 2.5 2.7 V OSC low voltage Voscl 0.8 1.0 1.2 V OSC charge current Icosc –16 –8 –4 µA OSC discharge current Idosc 4 8 16 µA Output ON duty 1 Poh1 75 80 85 Vth=Vref x 0.222 % Output 1kΩ, OSC=100pF Output ON duty 2 Poh2 45 50 55 Vth=Vref x 0.294 % Output 1kΩ, OSC=100pF Output ON duty 3 Poh3 15 20 25 Vth=Vref x 0.367 % Output 1kΩ, OSC=100pF Reference voltage Vref 5.8 6.0 6.2 V Iref=–2mA Hall bias voltage 1 Vhb1 1.10 1.30 1.50 V Ihb=–2mA Hall bias voltage 2 Vhb2 1.05 1.25 1.48 V Ihb=–10mA Current limit setting voltage Vcl 280 310 340 mV TH input bias current Ith - - –0.2 µA Vth=0V MIN input bias current Imin - - –0.2 µA Vmin=0V CS input bias current Ics - - –0.2 µA Vcs=0V About a current item, define the inflow current to IC as a positive notation, and the outflow current from IC as a negative notation. Ref. data Fig.3 Fig.4 Fig.4 Fig.5 to 8 Fig.9 Fig.10 Fig.11, 12 Fig.13 Fig.14 Fig.14 Fig.15 Fig.15 - - - Fig.16, 17 Fig.18, 19 Fig.19 Fig.20 Fig.21 Fig.22 Fig.


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