Datasheet
DC Brushless Fan Motor Drivers
Multifunction Single-phase Full-wave
Fan Motor Driver
BD6974FV-LB
General Description
This is the product guarantees long time support in
Industrial market.
BD6974FV-LB is a pre-driver that controls the motor
drive part composed of the power transistors. Moreover,
a lot of functions are installed, and the pin is compatible
with BD6973FV-LB (Rotation speed pulse signal output).
Package
SSOP-B16
W (Typ) x D (Typ) x H (Max)
5.00mm x 6.40mm x 1.35mm
Features
Long Time Support Product for Industrial Applications
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
Lock Alarm Signal (AL) Output
SSOP-B16
Application
Industrial Equipment and Fan motors for general
consumer equipment of desktop PC, and Server, etc.
Absolute Maximum Ratings
(Ta=25°C)
Parameter
Supply Voltage
Power Dissipation
Operating Temperature Range
Storage Temperature Range
High Side Output Voltage
Low Side Output Voltage
Low Side Output Current
Lock Alarm Signal (AL) Output Voltage
Lock Alarm Signal (AL) Output Current
Reference Voltage (REF) Output Current
Hall Bias (HB) Output Current
Input Voltage (H+, H–, TH, MIN, CS)
Junction Temperature
Symbol
Vcc
Pd
Topr
Tstg
Voh
Vol
Iol
Val
Ial
Iref
Ihb
Vin
Tjmax
Limit
20
0.87
(Note 1)
–40 to +100
–55 to +150
36
15
10
20
10
12
12
7
150
Unit
V
W
°C
°C
V
V
mA
V
mA
mA
mA
V
°C
(Note 1) Reduce by 7.0mW/°C over Ta=25°C. (On 70.0mm×70.0mm×1.6mm glass epoxy board)
Caution: Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit
between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated
over the absolute maximum ratings.
Recommended Operating Conditions
(Ta=–40°C to +100°C)
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
Limit
4.3 to 17.0
0 to 7
Vin1
0 to Vcc–2
Vin2
0 to Vref
V
V
Unit
V
V
○Product
structure：Silicon monolithic integrated circuit
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© 2013 ROHM Co., Ltd. All rights reserved.
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○This
product has no designed protection against radioactive rays
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TSZ02201-0H1H0B100830-1-2
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BD6974V-LB
Pin Configuration
(TOP VIEW)
AL
OSC
MIN
TH
REF
Vcc
A1H
A1L
1
2
3
4
5
6
7
8
Figure 1. Pin Configuration
16
15
14
13
12
11
10
9
GND
H–
HB
H+
SS
CS
A2H
A2L
Datasheet
Pin Description
P/No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
P/Name
AL
OSC
MIN
TH
REF
Vcc
A1H
A1L
A2L
A2H
CS
SS
H+
HB
H–
GND
Function
Lock alarm signal
output pin
Oscillating capacitor connecting pin
Minimum output duty setting pin
Output duty controllable input pin
Reference voltage output pin
Power supply pin
High side output 1 pin
Low side output 1 pin
Low side output 2 pin
High side output 2 pin
Output current detection pin
Soft start capacitor connecting pin
Hall + input pin
Hall bias pin
Hall – input pin
Ground pin
Block Diagram
AL
GND
1
SIGNAL
OUTPUT
PWM SOFT
SWITCHING
TSD
HALL
AMP
16
2
OSC
OSC
HALL
COMP
H–
15
3
MIN
PWM
COMP
HALL
BIAS
CONTROL
LOGIC
HB
14
4
TH
QUICK
START
PWM
COMP
LOCK
PROTECT
Vcl
H+
13
5
REF
SS
Vcc
12
REF
6
SOFT START
& CURRENT
LIMIT COMP
CS
A2H
Vcc
A1H
REG
11
PRE-
DRIVER
REG
7
10
8
A1L
A2L
9
Figure 2. Block Diagram
I/O Truth Table
Hall Input
H+
H–
H
L
L
H
A1H
Hi-Z
L
Driver Output
A1L
A2H
H
L
L
Hi-Z
A2L
L
H
H; High, L; Low, Hi-Z; High impedance
Motor State
Rotating
Locking
L; Low, Hi-Z; High impedance
AL output is open-drain type.
AL
L
Hi-Z
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BD6974V-LB
Electrical Characteristics
(Unless Otherwise Specified Ta=25°C, Vcc=12V)
Parameter
Circuit Current
Hall Input Hysteresis Voltage
High Side Output Current
High Side Output Leak Current
Low Side Output High Voltage
Low Side Output Low Voltage
Lock Detection ON Time
Lock Detection OFF Time
AL Output Low Voltage
AL Output Leak Current
OSC High Voltage
OSC Low Voltage
OSC Charge Current
OSC Discharge Current
Output ON Duty 1
Symbol
Icc
Vhys
Ioh
Iohl
Volh
Voll
ton
toff
Vall
Iall
Vosch
Voscl
Icosc
Idosc
Poh1
Min
3
±5
9.0
-
9.3
-
0.20
4.0
-
-
2.3
0.8
–55
25
75
Limit
Typ
5
±10
12.0
-
9.5
0.5
0.30
6.0
-
-
2.5
1.0
–40
40
80
Max
8
±15
16.5
10
-
0.7
0.45
9.0
0.3
10
2.7
1.2
–25
55
85
Unit
mA
mV
mA
μA
V
V
s
s
V
μA
V
V
μA
μA
%
Ial=5mA
Val=17V
Conditions
Datasheet
Ref. Data
Figure 3
Figure 4
Voh=12V
Voh=36V
Iol=–5mA
Iol=5mA
Figure 5
Figure 6
Figure 7,
Figure 8
Figure 9,
Figure 10
Figure 11
Figure 12
Figure 13,
Figure 14
Figure 15
Figure 16
Figure 16
Figure 17
Figure 17
Output ON Duty 2
Poh2
45
50
55
%
Output ON Duty 3
Poh3
15
20
25
%
Vth=Vref x 0.26
Pull up resistance 1kΩ,
OSC=470pF
Vth=Vref x 0.35
Pull up resistance 1kΩ,
OSC=470pF
Vth=Vref x 0.44
Pull up resistance 1kΩ,
OSC=470pF
Iref=–2mA
Ihb=–2mA
-
-
-
Figure 18,
Figure 19
Figure 20,
Figure 21
Figure 22
Figure 23
Figure 24
Figure 25
Figure 26
Reference Voltage
Hall Bias Voltage
Current Limit Setting Voltage
SS Charge Current
TH Input Bias Current
MIN Input Bias Current
CS Input Bias Current
Vref
Vhb
Vcl
Iss
Ith
Imin
Ics
4.8
1.10
120
–300
5.0
1.26
150
–120
5.2
1.50
180
–50
V
V
mV
nA
μA
μA
μA
-
-
-
-
-
-
–0.2
–0.2
–0.2
Vss=0V
Vth=0V
Vmin=0V
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.
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TSZ02201-0H1H0B100830-1-2
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BD6974V-LB
Typical Performance Curves (Reference Data)
Datasheet
10
Hall Input Hysteresis Voltage: Vhys[mV]
20
8
Circuit Current: Icc[mA]
10
100°C
25°C
–40°C
6
100°C
25°C
4
0
Operating Range
–40°C
25°C
100°C
–40°C
-10
2
Operating Range
0
0
5
10
15
20
-20
0
5
10
15
20
Supply Voltage: Vcc[V]
Supply Voltage: Vcc[V]
Figure 3. Circuit Current vs Supply Voltage
Figure 4. Hall Input Hysteresis Voltage vs Supply Voltage
17
High Side Output Leak Current: Iohl[uA]
8
High Side Output Current: Ioh[mA]
14
100°C
25°C
–40°C
6
11
4
8
2
100°C
25°C
–40°C
Operating Range
5
0
Operating Range
2
0
5
10
15
20
-2
0
10
20
30
40
Supply Voltage: Vcc[V]
Output Voltage: Voh[V]
Figure 5. High Side Output Current vs Supply Voltage
Figure 6. High Side Output Leak Current vs Output Voltage
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TSZ02201-0H1H0B100830-1-2
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BD6974V-LB
Typical Performance Curves (Reference Data)
Datasheet
12
Low Side Output High Voltage: Volh[V]
Low Side Output High Voltage: Volh[V]
12
10
–40°C
25°C
100°C
10
17V
12V
8
8
6
6
4
4
2
2
0
0
2
4
6
8
10
0
0
2
4.3V
4
6
8
10
Output Source Current: Io[mA]
Figure 7. Low Side Output High Voltage vs Output Source Current
Output Source Current: Io[mA]
Figure 8. Low Side Output High Voltage vs Output Source Current
(Vcc=12V)
(Ta=25°C)
1.6
Low Side Output Low Voltage: Voll[V]
Low Side Output Low Voltage: Voll[V]
1.6
4.3V
1.2
1.2
0.8
0.8
100°C
25°C
0.4
0.4
12V
17V
–40°C
0.0
0
2
4
6
8
10
0.0
0
2
4
6
8
10
Output Sink Current: Io[mA]
Figure 9. Low Side Output Low Voltage vs Output Sink Current
Output Sink Current: Io[mA]
Figure 10. Low Side Output Low Voltage vs Output Sink Current
(Vcc=12V)
(Ta=25°C)
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TSZ02201-0H1H0B100830-1-2
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