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PDF LB11851FA Data sheet ( Hoja de datos )
| Número de pieza | LB11851FA | |
| Descripción | Microprocessor Fan Motor Interface Driver | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LB11851FA (archivo pdf) en la parte inferior de esta página. Total 5 Páginas | ||
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Ordering number: ENA2092
LB11851FA
Monolithic Digital IC
Microprocessor Fan Motor
Interface Driver
http://onsemi.com
Overview
The LB11851FA provides an interface between a microcontroller motor control signal and external MOS transistors.
This device can implement a microprocessor fan driver with a minimal number of external components. The
LB11851FA is optimal for server and personal computer microprocessor fan drive in response to temperature or other
external signals when high precision and high air flow are required.
Features
• Fan motor interface driver function (FGIN)
⇒ This IC accepts a signal from a microcontroller and interfaces to external power transistors (PMOS and NMOS) to
provide high-efficiency low-power single-phase full-wave drive.
• Variable speed input pin (PWMIN)
⇒ PMOS side PWM control
NMOS side current regeneration using slow decay is used to achieve quite high-speed control.
• Built-in kickback absorption circuit (OUT1P/2P)
⇒ This circuit absorbs the kickback current that is generated at phase switching or power on/off to achieve smooth
current regeneration and protect the external transistors against destruction or degradation.
• Built-in current limiter circuit (SENSE)
⇒ This circuit implements a chopper-type current limiting control that operates at startup and during lock protection
mode.
The current detection voltage is set to a fixed 0.2V internally.
• Built-in microcontroller power supply (5VREG)
Semiconductor Components Industries, LLC, 2013
May, 2013
71112 SY 20120702-S00002 No.A2092-1/5
1 page  
LB11851FA
1. Power supply (VCC and VM) and ground
The wiring is separated into the control IC side (VCC line) and the motor output side (VM line) by the diode DI, which
protects the IC from destruction on reverse connection. The application circuit uses 1μF capacitors to prevent line
oscillation when kickback occurs. Similarly, 1μF capacitors are also used on the VCC line for power supply line
stabilization.
2. PWMIN
The LB11851M accepts an open-drain output signal from the microcontroller with this pin and controls the on/off
states of the PMOS transistor (OUT1P and OUT2P) outputs accordingly. A constant-current bias is provided from
5VREG internally to the IC.
3. FGIN
The LB11851M accepts a CMOS output from the microcontroller with this pin and determines the drive phase output
(OUT1P, OUT2P, OUT1N, or OUT2N).
4. 5VREG
This is the power supply for the microcontroller, Hall effect sensors, and other circuits. A capacitor with a value of
1μF is used for output stabilization. This pin has an output current capacity of 20mA.
5. SENSE
A sensing resistor is used for current detection. If the SENSE pin voltage exceeds 0.2V, the PMOS transistors are
turned off and only low side regeneration is performed.
*<OUT1, 2P output H voltage / OUT1, 2N output L voltage>
Output L voltage of OUT1 and 2 sticks in GND when FET is put up outside like the example of applied circuit by
internal pull-down resistor (20KΩ), and there is no what turns on FET.
Output H voltage of OUT1 and 2 sticks in VCC with internal pull-up resistor (20kΩ) as the Pch side is also similar.
ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC owns the rights to a number
of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of SCILLC’s product/patent coverage may be accessed at
www.onsemi.com/site/pdf/Patent-Marking.pdf. SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no
warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the
application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental
damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual
performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical
experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use
as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in
which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for
any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors
harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or
death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the
part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PS No.A2092-5/5
5 Page | ||
| Páginas | Total 5 Páginas | |
| PDF Descargar | [ Datasheet LB11851FA.PDF ] | |
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