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PDF LV8800V Data sheet ( Hoja de datos )
| Número de pieza | LV8800V | |
| Descripción | Fan Motor Driver | |
| Fabricantes | ON Semiconductor | |
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Ordering number : ENA0845A
LV8800V
Bi-CMOS IC
For Notebook PC
Fan Motor Driver
http://onsemi.com
Overview
The LV8800V is a motor driver for notebook PC fans.
Feature
• Direct PWM sensorless motor driver
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Power supply voltage
Predrive voltage (gate voltage)
VCC max
VG max
6.5
10
Output pin current
PWM input pin withstand voltage
FG output pin withstand voltage
FG output current
Power dissipation 1
IOUT max
VPWM max
VFG max
IFG max
Pd max1
Independent IC
0.7
VCC
6.0
5.0
0.3
Power dissipation 2
Pd max2
Mounted on specified board *1
0.8
Operating temperature
Topr
*2
-30 to +95
Storage temperature
Tstg
-55 to +150
*1 : When mounted on 76.1mm×114.3mm×1.6mm glass epoxy board
*2 : Tj max = 150°C. Use the IC in the range where the temperature of the chip does not exceed Tj = 150°C during operation.
Unit
V
V
A
V
V
mA
W
W
°C
°C
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
Power supply voltage
Symbol
VCC
Conditions
Ratings
2.2 to 6.0
Unit
V
Semiconductor Components Industries, LLC, 2013
May, 2013
82907 MS 20070726-S00002 / 62007 MS PC 20070529-S00004 No.A0845-1/7
1 page  
LV8800V
Continued from preceding page.
Pin No. Pin name
Function
12 VG Charge pump step-up output. A capacitor must be
connected between this pin and ground.
VCC
13 CP Charge pump step-up pulse output pin. A capacitor
must be connected between this pin and the CPC
pin (pin 14).
14
CPC
Charge pump step-up pin. A capacitor must be
connected between this pin and the CP pin (pin 13).
Equivalent circuit
13 14
12
LV8800V Functional Description and Notes on External Components
Read the following notes before designing driver circuits using the LV8800V to design a system with fully satisfactory
characteristics.
1. Output drive circuit and speed control methods
The LV8800V adopts the synchronous commutation PWM drive method to minimize power loss in the output circuits.
Low on-resistance DMOS devices (total high and low side on-resistance of output block : 1.2Ω, typical) are used as
the output transistors.
The speed control of the driver is performed with an externally input PWM signal.
PWM controls the speed by performing switching in accordance with the duty cycle that is input to the PWM pin
(11-pin). The output transistor is on when a high-level voltage is input to the PWM pin, and off when a low-level
voltage is input. When the motor is used with the PWM pin open, the built-in resistor causes the PWM pin to change to
high-level voltage and the motor speed rises to full speed. When the PWM pin is fixed at low-level voltage, the motor
decelerates, and after the motor stops it enters “Power Saving Mode.
2. Soft Switching Circuit
This IC adopts variable duty soft switching to minimize the motor drive noise.
3. Current limiter circuit
The current limiter circuit limits the output current peak value to a level determined by the equation I = VRF/RF (VRF
= 0.25V typical). The current limiter circuit detects the peak current of the output transistors at the RF pin (pin 15) and
turns off the transistor of the PWM phase.
4. OSC circuit
The OSC pin (pin 7) is an oscillation pin provided for sensorless motor startup commutation. When a capacitor is
connected between the OSC pin and ground, the OSC pin starts self-oscillation, and this becomes the startup
frequency. The oscillator frequency can be adjusted by changing the value of the external capacitor (i.e. reducing the
value of the capacitor increases the startup frequency).
It is necessary to select a value of the capacitor that provides the optimal startup characteristics.
5. Position Detector Comparator Circuit for Rotor
The position detection comparator circuit for the rotor is a comparator for detecting rotor positional information with
the back EMF signal generated when the motor rotates. The IC determines the timing at which the output block applies
current to the motor based on the position information obtained here. Insert a capacitor (between 1,000 and 10,000pF)
between the COMIN pin (pin 5) and FIL (pin 6) to prevent any motor startup missoperation that is caused by the
comparator input noise.
6. FG Output Circuit
The FG pin (pin 10) is the FG output pin. It provides a pulse signal equivalent to that provided by systems that use a
Hall-effect sensor.
No.A0845-5/7
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LV8800V.PDF ] | |
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