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PDF LB11961V Data sheet ( Hoja de datos )

Número de pieza LB11961V
Descripción Single-Phase Full-Wave Fan Motor Driver
Fabricantes Sanyo Semicon Device 
Logotipo Sanyo Semicon Device Logotipo



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Ordering number : EN8794B
LB11961V
Monolithic Digital IC
Single-Phase Full-Wave
Fan Motor Driver
Overview
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
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to
"standard application", intended for the use as general electronics equipment. The products mentioned herein
shall not be intended for use for any "special application" (medical equipment whose purpose is to sustain life,
aerospace instrument, nuclear control device, burning appliances, transportation machine, traffic signal system,
safety equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives
in case of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any
guarantee thereof. If you should intend to use our products for new introduction or other application different
from current conditions on the usage of automotive device, communication device, office equipment, industrial
equipment etc. , please consult with us about usage condition (temperature, operation time etc.) prior to the
intended use. If there is no consultation or inquiry before the intended use, our customer shall be solely
responsible for the use.
Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate
the performance, characteristics, and functions of the described products in the independent state, and are not
guarantees of the performance, characteristics, and functions of the described products as mounted in the
customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent
device, the customer should always evaluate and test devices mounted in the customer's products or
equipment.
92111 SY 20110915-S00002/31407 TI PC 20070206-S0006 No.8794-1/7
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LB11961V pdf
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Application Circuit Example
LB11961V
*2
CM
HB
*7
H IN
VCC
*3
IN+
6VREG
*6
FG
*5
RD
RMI
*8
OUT1
CP = 100pF
*4
CT = 0.47μF to 1μF
VTH
CPWM
CT
S-GND
OUT2
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.)
No.8794-5/7
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