Document
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
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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
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© 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.