The LB11961V is a single-phase bipolar drive motor driver that easily implements direct PWM motor drive systems
with excellent efficiency. The LB11961V is optimal for fan motor drive in personal computer power supply systems
and CPU cooling fan systems.
Features
•
Single-phase full-wave drive (16V, 1.0A transistors are built in)
•
Built-in variable speed function controlled by a thermistor input
The LB11961V can implement quiet, low-vibration variable speed control using externally clocked high side
transistor direct PWM drive.
•
Built-in regenerative diode (Di); only requires a minimal number of external components.
•
Built-in HB
•
Minimum speed setting pin (allows full-speed mode operation at startup)
•
Operates in full-speed mode when the thermistor is removed.
•
Built-in lock protection and automatic recovery circuits
•
FG (speed detection) and RD (lock detection) outputs
•
Built-in thermal shutdown circuit
Semiconductor Components Industries, LLC, 2013
May, 2013
92111 SY 20110915-S00002/31407 TI PC 20070206-S0006 No.8794-1/7
LB11961V
Specifications
Absolute Maximum Ratings
at Ta = 25°C
Parameter
VCC maximum output voltage
OUT pin maximum output
current
OUT pin output withstand
voltage
HB maximum output current
VTH input pin voltage
RD/FG output pin output voltage
RD/FG maximum output current
Allowable power dissipation
Operating temperature
Storage temperature
IHB max
VTH max
VRD/FG max
IRD/FG max
Pd max
Topr
Tstg
When mounted on a circuit board *1
VOUT max
Symbol
VCC max
IOUT max
Conditions
Ratings
18
1.0
18
10
6
18
10
0.8
-30 to +90
-55 to +150
Unit
V
A
V
mA
V
V
mA
W
°C
°C
*1 Specified circuit board : 114.3
×
76.1
×
1.6mm
3
, glass epoxy.
Caution 1) Absolute maximum ratings represent the value which cannot be exceeded for any length of time.
Caution 2) Even when the device is used within the range of absolute maximum ratings, as a result of continuous usage under high temperature, high current,
high voltage, or drastic temperature change, the reliability of the IC may be degraded. Please contact us for the further details.
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Recommended Operating Conditions
at Ta = 25°C
Parameter
VCC supply voltage
VTH input level voltage range
Hall sensor input common-mode
input voltage range
Symbol
VCC
VTH
VICM
Conditions
Ratings
4.5 to 16
0 to 9
0.2 to 3
Unit
V
V
V
Electrical Characteristics
Unless otherwise specified Ta
=
25°C, VCC = 12V
Parameter
Circuit current
Symbol
ICC1
ICC2
6VREG voltage
HB voltage
CPWM high-level voltage
CPWM low-level voltage
CPWM oscillator frequency
CT pin high-level voltage
CT pin low-level voltage
ICT charge current
ICT discharge current
ICT charge/discharge current
ratio
OUT output low saturation
voltage
OUT output high saturation
voltage
Hall sensor input sensitivity
RD/FG output pin low-level
voltage
RD/FG output pin leakage
current
IRDL/FGL
VRD/FG = 7V
30
μA
VHN
VRDL/FGL
Zero peak value (including offset and
hysteresis)
VRD/FG = 5mA
0.2
0.3
V
10
20
mV
VOH
IO = 200mA
0.9
1.1
V
VOL
IO = 200mA
0.2
0.3
V
V6VREG
VHB
VCRH
VCRL
FPWM
VCTH
VCTL
ICT1
ICT2
RCT
C = 100pF
Drive mode
Lock protection mode
I6VREG = 5mA
IHB = 5mA
Conditions
min
12
8
5.8
1.10
3.45
1.95
18
3.45
1.55
1.5
0.15
8.5
Ratings
typ
18
11
6
1.25
3.6
2.05
25
3.6
1.7
2
0.2
10
max
24
16
6.2
1.40
3.75
2.15
32
3.75
1.85
2.5
0.25
11.5
mA
mA
V
V
V
V
kHz
V
V
μA
μA
Unit
No.8794-2/7
LB11961V
Package Dimensions
unit : mm (typ)
3178B
1.0
Pd max – Ta
Specified circuit board : 114.3×76.1×1.6mm
3
glass epoxy board
5.2
16
9
Allowable power dissipation, Pd max – W
0.8
0.6
4.4
6.4
0.5
0.4
0.38
1
0.65
(0.33)
8
0.15
0.22
1.5max
0.2
0
–
30
–
20
–
10
0
10
20
30
40
50
60
70
80
90 100
SANYO : SSOP16(225mil)
Truth Table
VTH
Low
(open)
High
-
-
IN-
High
Low
High
Low
High
Low
IN+
Low
High
Low
High
Low
High
CPWM
High
Low
Low
-
High
CT
OUT1
High
Low
Off
Low
High
Off
OUT2
Low
High
Low
Off
Off
High
FG
Low
Off
Low
Off
Low
Off
Off
On
RD
(PWM off)
During rotation
−
regeneration
(PWM on)
Lock protection
Mode
During rotation
−
drive
CPWM – High is the state where CPWM > VTH, and CPWM– Low is the state where CPWM < VTH.
Open : The LB11961V operates in full-speed mode when the thermistor is removed.
Pin Assignment
OUT2
NC
VCC
RMI
VTH
CPWM
FG
RD
1
2
3
4
16
15
14
13
P-GND
OUT1
S-GND
CT
6VREG
IN−
HB
IN+
0.1 (1.3)
Ambient temperature, Ta – °C
LB11961V
5
6
7
8
Top view
12
11
10
9
SSOP-16
P-GND : Motor system ground
S-GND : Control system ground
No.8794-3/7
LB11961V
Block Diagram
FG
RD
Thermal
protection circuit
VCC
6VREG
Constant
voltage
Delay circuit
1.3V
HB
Hall
Control
circuit
OUT2
M
IN+
Delay circuit
IN−
Amplifier with
hysteresis
Charge/discharge
circuit
Oscillator
circuit
OUT1
S-GND
CT
VTH
CPWM
P-GND
No.8794-4/7
LB11961V
Application Circuit Example
CM
*2
VCC
HB
*7
H
*3
IN−
FG
IN+
6VREG
RD
*
6
*
5
RMI
*
8
VTH
OUT1
OUT2
CPWM
CP = 100pF
*
4
CT
CT = 0.47μF to 1μF
S-GND
P-GND
*
1
*1.
Power supply and ground lines
P-GND is connected to the motor power supply system and S-GND is connected to the control circuit power supply system.
These two systems should be formed from separate lines and the control system external components should be connected to
S-GND.
*2.
Regeneration power supply stabilization capacitor
The capacitor CM provides power supply stabilization for both PWM drive and kickback absorption. A capacitor with a value of
over 0.1µF is used for CM. A large capacitor must be used when the coil inductance is large or when the coil resistance is low.
Since this IC adopts a technique in which switching is performed by the high side transistor and regeneration is handled by the low
side transistor, the pattern connecting CM to VM and P-GND must be as wide and as short as possible.
*3.
Hall sensor input
Lines that are as short as possible must be used to prevent noise from entering the system. The Hall sensor input circuit consists of
a comparator with hysteresis (20mV). We recommend that the Hall sensor input level be at least three times this hysteresis, i.e. at
least 60mVp-p.
*4.
PWM oscillator frequency setting capacitor
If a value of 100pF is used for CP, the oscillator frequency will be f = 25kHz, and this will be the basic frequency of the PWM
signal.
*5.
RD output
This is an open collector output. It outputs a low level when the motor is turning and a high level when it is stopped. This pin must
be left open if unused.
*6.
FG output
This is an open collector output, and a rotation count detection function can be implemented using this FG output, which
corresponds to the phase switching. This pin must be left open if unused.
*7.
HB pin
This pin provides a Hall effect sensor bias constant-voltage output of 1.25V.
*8.
RMI pin
Connect this pin to VTH if unused. Even if unused, the IC is set internally to operate at a 10% drive duty at the voltage
corresponding to the lowest speed. (The capacitor is used to set up full-speed mode at startup.)
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