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Part: FAN8460MTC
Category:
Description: DC Cooling Fan Single Phase PWM Driver
Company: Fairchild Semiconductor
Datasheet: Download FAN8460MTC datasheet File size : 400 kB
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FAN8460MTC/FAN8460MP
Single Phase Full Wave BLDC Motor Driver with Variable Speed Control
Features
· Output direct PWM drive for speed control · Selectable PWM frequency : internal or external · Versatile speed control inputs: A thermistor or PWM input. · A wide range of operating voltage: 3.2V to 28V · Locked rotor protection with open collector output and auto retry · Open collector hall output for speed feedback · Adjustable minimum speed · Thermistor disconnection protection · TSD protection.
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 temperature sensing.These two kinds of input schemes can meet various system requirements and applications.
14-TSSOP
14-MLP 4X4
Typical Applications
· CPU Cooling Fans · Instrumentation Fans · Desktop PC Fans
Ordering Information
Device FAN8460MTC FAN8460MTCX FAN8460MP FAN8460MPX Package 14-TSSOP 14-TSSOP 14-MLP 4x4 14-MLP 4x4 Operating Temp. -30°C ~ 90°C -30°C ~ 90°C -30°C ~ 90°C -30°C ~ 90°C
Rev.1.0.2
©2003 Fairchild Semiconductor Corporation
FAN8460MTC/FAN8460MP
Block Diagram
9
VM OU TA OU TB
TACO
14
6 8
Commutation & Control & TSD
PWM
AL
13
H+ H-
2 1
10 7
VS GN D
Lock Dete ctio n & Auto Res t ar t
LD
3
VLDCP
12
CT
VLDCL Triangle Wave Generator Switching Co ntrol
VPWM
5
VS
2V Reference PWM SPWM Decoder
IPWM VCON VREF
11 4
2
FAN8460MTC/FAN8460MP
Pin Definitions
Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Pin Name H- H+ LD VREF VPWM OUTA GND OU T B VM VS VCON CT AL TACO I/O A A A A I A P A P P A A O O Pin Function Description Hall input Hall input + Sawtooth wave generator for lock detector and automatic restart Reference voltage output PWM input for speed control Motor output A Ground Motor output B Power supply for output stage Power supply for signal block Speed control signal Triangle waveform out Alarm output Speed output Open collector Open collector Remark
3
FAN8460MTC/FAN8460MP
Absolute Maximum Ratings (Ta = 25°C)
Parameter Maximum power supply voltage Thermal resistance S ymbol VSMAX, VMMAX R ja Value 32 143 (FAN8460MTC) 150 (FAN8460MP case1) 45 (FAN8460MP case2) 870 (FAN8460MTC) 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 VPWM Input voltage Operating temperature Storage temperature PDMAX VOMAX IO M A X IOPEAK ITACO/AL VTACO/AL VHO VVPWM TOPR T STG 800 (FAN8460MP case1) 2700 (FAN8460MP case2) 36 0.8note 1.2note 5 36 36 -0.3~ VS -30 ~ 90 -55 ~ 150
o
Unit V
oC/W
C /W
oC/W
mW mW mW V A A mA V V V °C °C
Case 1
Case 2
Remark
Pd is measured base on the JEDEC/STD(JESD 51-2)
Power plane(Cu)
GND plane(Cu)
PCB(glass-epoxy)
Via
Pd= 0.8W
note :
Pd= 2.7W
1. Refer: EIA/JESD 51-2 & EIA/JESD 51-3 & EIA/JESD 51-5 & EIA/JESD 51-7 2. Case 1: Single layer PCB with 1 signal plane only, PCB size 76mm × 114mm × 1.6mm. 3. Case 2: Multi layer PCB with 1 signal, 1 power and 1 ground planes, PCB size 76mm × 114mm × 1.6mm, Cu plane sizes for power and ground 74mm × 74mm × 0.035mm, thermal via hole pitch 0.9mm, via hole size 0.3mm, 6 via hole. 4. Should not exceed PD or ASO value. 5. IOPEAK time is within 2us.
4
FAN8460MTC/FAN8460MP
Power Dissipation Curve
Pd [mW] 3,000 2,000 1,000 0 c a se1 25 case 2
SOA
14TSSOP
0
50
75
1 00
125
150
175
Ambient Temperature, Ta [°C]
Recommended Operating Conditions (Ta = 25°C)
Parameter Supply voltage for signal block Supply voltage for output stage Symbol VS VM Min. 3.2 3.2 Typ. - - Max. 28 28 Unit V V
5
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