FAN8460MPX FAIRCHILD [Fairchild Semiconductor], FAN8460MPX Datasheet

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FAN8460MPX

Manufacturer Part Number
FAN8460MPX
Description
Single Phase Full Wave BLDC Motor Driver with Variable Speed Control
Manufacturer
FAIRCHILD [Fairchild Semiconductor]
Datasheet

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Part Number
Manufacturer
Quantity
Price
Part Number:
FAN8460MPX
Manufacturer:
TI
Quantity:
4 790
Features
• Output direct PWM drive for speed control
• Selectable PWM frequency : internal or external
• Versatile speed control inputs: A thermistor or PWM
• A wide range of operating voltage: 3.2V to 28V
• Locked rotor protection with open collector output and
• Open collector hall output for speed feedback
• Adjustable minimum speed
• Thermistor disconnection protection
• TSD protection.
Typical Applications
• CPU Cooling Fans
• Instrumentation Fans
• Desktop PC Fans
©2004 Fairchild Semiconductor Corporation
FAN8460MTC/FAN8460MP
Single Phase Full Wave BLDC Motor Driver with
Variable Speed Control
input.
auto retry
Description
The FAN8460MTC/FAN8460MP is a single phase BLDC
motor driver with variable speed control using output direct
PWM method and it’s typical application is DC cooling fans
with wide range of supply voltage(5/12/24V). This approach
eliminates the need for external pass devices such as BJT,
MOSFET. This solution also offers other advantages over
commonly used external PWM turning fan’s power on and
off at fixed frequency. The external PWM increas stress on
fan and needs level translation in speed and alarm output
because these outputs share the fan’s negative terminal.
In case of CPU cooling, digital controller can give speed
control command with PWM signal adjusting the duty. If a
system has no digital controller, the NTC thermistor input
mechanism can control fan speed with local or ambient tem-
perature sensing.These two kinds of input schemes can meet
various system requirements and applications.
Ordering Information
14-TSSOP
14-MLP 4X4
FAN8460MTCX
FAN8460MTC
FAN8460MPX
Device
14-MLP 4x4
14-TSSOP
14-TSSOP
Package
www.fairchildsemi.com
Operating Temp.
30 C ~ 90 C
30 C ~ 90 C
30 C ~ 90 C
Rev.1.0.3

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FAN8460MPX Summary of contents

Page 1

... Ordering Information Device Package FAN8460MTC 14-TSSOP FAN8460MTCX 14-TSSOP FAN8460MPX 14-MLP 4x4 Operating Temp Rev.1.0.3 ...

Page 2

FAN8460MTC/FAN8460MP Block Diagram 9 VM OUTA 6 OUTB GND CT 12 Triangle Generator Switching Control 2 Commutation Control TSD PWM Lock Detection & Auto Restart Wave PWM S PWM Decoder I PWM VPWM 5 TACO 14 ...

Page 3

Pin Definitions Pin Number Pin Name VREF 5 VPWM 6 OUTA 7 GND 8 OUTB VCON TACO I/O Pin Function Description A Hall ...

Page 4

FAN8460MTC/FAN8460MP Absolute Maximum Ratings ( Parameter Maximum power supply voltage Thermal resistance Maximum power dissipation Maximum output voltage Maximum output current Maximum output peak current Maximum Taco/Alarm output current Taco/Alarm output sustain voltage Hall output withstanding voltage ...

Page 5

Power Dissipation Curve Pd [mW] 3,000 2,000 SOA 1,000 case1 Recommended Operating Conditions ( Parameter Supply voltage for signal block Supply voltage for output stage case2 14TSSOP 50 75 100 125 150 Symbol VS ...

Page 6

FAN8460MTC/FAN8460MP Equivalent Circuits Description Pin No. Hall input Output AL/TACO Internal Circuit VCC 1 VCC ...

Page 7

Equivalent Circuits Description Pin No. VPWM 5 VCON/CT 11/12 Internal Circuit Reference 5 VCC 11 FAN8460MTC/FAN8460MP 12 7 ...

Page 8

FAN8460MTC/FAN8460MP FAN8460MTC/FAN8460MP Electrical Characteristics ( 12V unless otherwise specified) S Parameter Common Block Supply current Reference output voltage Reference output voltage Lock Detector & Auto Restart LD charging current LD discharging current LD clamp voltage ...

Page 9

Application Information 1 Direct output PWM for FAN Motor Speed Control Direct output PWM method is used to control driving power to a fan motor and thus fan motor speed. A motor current, and thus fan motor speed is proportional ...

Page 10

FAN8460MTC/FAN8460MP motor while PWM switching occurs. PWM occurs on the high side, and the freewheeling current flow on the low side during T . OFF 3 Triangle Waveform Generator (PWM Oscillator) The PWM oscillator output (V ) sets output PWM ...

Page 11

K ohm 100 tem p era ...

Page 12

FAN8460MTC/FAN8460MP output PWM duty is proportional to input PWM duty with some dead band. The output PWM frequency is defined by external capacitor there is no relationship between VPWM input frequency and output PWM frequency. Table 1 summarizes ...

Page 13

For example 0.33uF, then T LD ON= rotor condition to super IO or system controller. Because the AL output is open collector type, end user can pull up this pin with a external resistor to the supply voltage ...

Page 14

FAN8460MTC/FAN8460MP 6. Hall Sensor Amplifier The hall current ( determined as follows -------------------------- - Where external limiting resistor and Ri is input impedance of ...

Page 15

Typical Application Circuits > 0.47uF eletrolytic OUTA 6 OUTB GND 100pF Mode VPWM Thermistor Input GND NTC Thermistor based Speed Control Commutation Control ...

Page 16

FAN8460MTC/FAN8460MP Typical Application Circuits > 0.47uF eletrolytic OUTA 6 OUTB GND 100pF Mode VPWM H PWM Input L L/H 16 PWM Input Speed ...

Page 17

Typical Application Circuits > 0.47uF eletrolytic OUTA 6 OUTB GND CT 12 180K Mode VPWM H PWM Input L H/L PWM Input Speed Control using External PWM ...

Page 18

FAN8460MTC/FAN8460MP Package Dimensions (Unit: mm) 18 14-TSSOP ...

Page 19

Package Dimensions (Unit: mm) 14-MLP 4X4 FAN8460MTC/FAN8460MP 19 ...

Page 20

FAN8460MTC/FAN8460MP Typical Performance characreristics VS[V] 2.0 1.9 IREF=200uA 1.8 1.7 1.6 1 VS[V] Low side TR saturation voltage High side TR saturation voltage 2.5 2.0 VS=VM=12V 1.5 1.0 ...

Page 21

FAN8460MTC/FAN8460MP 21 ...

Page 22

FAN8460MTC/FAN8460MP DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR ...

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