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FAN8463 BTL Single Phase Full Wave BLDC Motor Driver
March 2005
FAN8463 BTL Single Phase Full Wave BLDC Motor Driver
Features
* * * * * * A low voltage operation : 2.3V to 5.5V Locked rotor protection and auto retry. Open collector FG output Open collector 1/2 FG output. Hall bias voltage output. TSD protection.
Description
The FAN8463MP/MTC is a BTL single phase BLDC motor driver and it's typical application is note PC cooling fans with low voltage operation(3.3/5V).
14-TSSOP
Typical Applications
* * Instrumentation Fans Note PC Fans
10-MLP
Ordering Information
Device
FAN8463MTC FAN8463MTCX FAN8463MPX Note X : Tape & Reel
Package
14-TSSOP 14-TSSOP 10-MLP
Operating Temp.
-30C ~ 90C -30C ~ 90C -30C ~ 90C
(c)2005 Fairchild Semiconductor Corporation
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FAN8463 Rev. 1.0.0
FAN8463 BTL Single Phase Full Wave BLDC Motor Driver
Block Diagrams(10MLP)
GND HB
6
VCC
8
OUT1
2
Reference Out
360R
TSD
VCC
5
OUT2
IN1
7
R
1
1/2FG
360R
10
IN2
R
3
FG
9
LD
4
Lock detector & Auto restart
FG & 1/2FG
Pin Definitions
Pin Number
14TSSOP
1 2 3 4 5 6 7 8 9 10 11 12 13 14
10MLP
1 2 3 4 5 6 7 8 9 10
Pin Name
IN1 HB IN2 NC LD NC OUT1 GND NC OUT2 NC VCC FG 1/2FG
I/O
A O A A A P
Pin Function Description
Hall amplifier input 1 Reference voltage output for hall bias Hall amplifier input 2 Sawtooth wave generator for lock detector and automatic restart Motor output 1 Ground -
Remark
-
-
A P O O
Motor output 2 Power supply Speed output for 4 pole motor Speed output for 8 pole motor
-
Open collector Open collector
FAN8463 Rev. 1.0.0
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FAN8463 BTL Single Phase Full Wave BLDC Motor Driver
Absolute Maximum Ratings (Ta = 25C)
Parameter
Maximum power supply voltage Thermal resistance
Symbol
VCCMAX Rja
Value
9.0 178(14TSSOP case1) 208(10MLP case1) 57(10MLP case2) 0.7(14TSSOP case1)
Unit
V
o
C/W
Maximum power dissipation Maximum output voltage Maximum output current Maximum FG output current FG output withstanding voltage Maximum 1/2FG output current 1/2FG output withstanding voltage Operating temperature Storage temperature
PDMAX VOMAX IOMAX IFG1 VFG1 IFG2 VFG2 TOPR TSTG
0.6( 10MLP case1) 2.2( 10MLP case2) 10.5 0.5
note1
W V A mA V mA V C C
5 9 5 9 -30 ~ 90 -55 ~ 150
Case 1
Case 2
Remark
Pd is measured base on the JEDEC/ Power STD(JESD plane(Cu) 51-2)
GND plane(Cu)
PCB(glass-epoxy)
Via
Pd= 0.6/0.7W
Pd= 2.2W
Note 1. Should not exceed PD or SOA value. 2. Refer: EIA/JESD 51-2 & EIA/JESD 51-3 & EIA/JESD 51-5 & EIA/JESD 51-7 3. Case 1: Single layer PCB with 1 signal plane only, PCB size 76mm x 114mm x 1.6mm. 4. Case 2: Multi layer PCB with 1 signal, 1 power and 1 ground planes, PCB size 76mm x 114mm x 1.6mm, Cu plane sizes for power and ground 74mm x 74mm x 0.035mm, thermal via hole pitch 0.9mm, via hole size 0.3mm, 6 via hole.
FAN8463 Rev. 1.0.0
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FAN8463 BTL Single Phase Full Wave BLDC Motor Driver
Power Dissipation Curve
Recommended Operating Conditions (Ta = 25C)
Parameter
Supply voltage
Symbol
VCC
Min.
2.3
Typ.
-
Max.
5.5
Unit
V
4 FAN8463 Rev.1.0.0
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FAN8463 BTL Single Phase Full Wave BLDC Motor Driver
Equivalent Circuits
Description Pin No. (10MLP) Internal Circuit
Hall input
1,3
VCC
1
3
VCC
HB 2
2
VCC
Output
5,7
5
7
9
FG/ 1/2FG
9 , 10
10
5 FAN8463 Rev.1.0.0
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FAN8463 BTL Single Phase Full Wave BLDC Motor Driver
Electrical Characteristics
(Ta = 25C, VCC = 3.3V unless otherwise specified) Parameter Total
Supply current Hall bias voltage ICC VHB Output off Iref=5mA 1.1 15 1.2 21 1.3 mA V
Symbol
Conditions
Min.
Typ.
Max.
Unit
Lock Detector & Auto Restart
LD charging current LD discharging current LD clamp voltage LD comparator voltage ILDC ILDD VLDCL VLDCP VLD=0V-->1.0V, VLD=1.0V VLD=2V-->1.0V, VLD=1.0V 1.4 0.15 0.8 0.4 2.2 0.33 1.2 0.6 2.9 0.50 1.6 0.8
A A
V V
Output Stage
Output saturation voltage (Upper+Lower) VOS IO=100mA 0.2 0.4 V
Speed output(FG)
FG output saturation voltage FG output leakage current 1/2FG output saturation voltage 1/2FG output leakage current VFGS1 IFGL1 VFGS2 IFGL2 IFG1=5mA VFG1=5.5V IFG2=5mA VFG2=5.5V 0.1 0.1 0.1 0.1 0.3 10 0.3 10 V
A
V
A
Hall Amplifier
Input range note1 Hall amplifier gain note: 1. Design guaranteed value VHDC GHA 0.3 47 50 VCC-1 53 V dB
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FAN8463 Rev.1.0.0
FAN8463 BTL Single Phase Full Wave BLDC Motor Driver
Application Information
1. BTL Single phase motor driver(OUT1, OUT2)
Using a BTL to drive a single-phase BLDC motor provides several advantages for dc fans over a H-bridge drive. A BTL drive has linear switching characteristics; hence, the BTL topology reduce commutation switching noise.
2. Locked Rotor Protection and Automatic Restart
When the rotor is locked, there is no change in input signal of hall amplifier and thus a internal TZERO pulse is not observed. A capacitor(CLD) connected LD pin is continually charged by internal current source(ILDC) to internal threshold (VLDCL) resulting from no Tzero pulse. When the voltage,VCLD on LD pin, reaches VLDCL, the speed information output (FG, 1/2FG) becomes floating high or low. When the VCLD reaches upper threshold, VLDCL, VCLD starts to decrease with internal current sink(ILDD) to the low threshold, VLDCP. At that time, the VCLD ramps up again and one of two outputs is turned on depending on locked rotor position during TON.The charging and discharging repeat until locked condition is removed, or FAN8463 is powered down. The overall time chart is shown in figure.1. The auto- retry time(TON), the motor protection time(TOFF), the locked rotor detection time(TLOCK) are proportional to external capacitor, CLD and each value can be calculated as follows;
T
ON
C x (V -V ) LD LDCL LDCP = ------------------------------------------------------------------------I LDC C x (V -V ) LD LDCL LDCP = ------------------------------------------------------------------------I LDD
T
OFF
T
C x VLDCL LD ---------------------------LOCK I
LDC
For example, CLD = 0.33uF, then TON =0.09Sec,TOFF=0.6Sec,TLOCK =0.18Sec.
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FAN8463 Rev.1.0.0
FAN8463 BTL Single Phase Full Wave BLDC Motor Driver
Figure 1. The Overall Time chart
Rotor IN1 IN2
NSNSNSN
N
SNSNSNS
TOFF VLDCL VLDCP
TON
LD Tzero OUT2 OUT1 1/2FG FG
Motor Locked Lock Released
1 rotation
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FAN8463 Rev.1.0.0
FAN8463 BTL Single Phase Full Wave BLDC Motor Driver
3. Hall Sensor Amplifier Figure 2. Hall Sensor Interface
V+
1HR
case1 The hall current (IH) is determined as follows; V+
I H = -----------------------------------------R H1 + R H2 + R i case1
V HB I H = ------------------RH + Ri
case2
Where, RH1 or RH2 is an external limiting resistor and Ri is input impedance of hall sensor. An external resistor, RH1 or RH2, can be used to decide an amplitude of hall signal. The input range of hall amplifier is between 0.3V and VCC-1.0V as shown in following figure.
Figure 3. Hall Amplifier Input Range
VCC
IN 1 or IN 2 IN 1 or IN 2
VC C /2 H all input available range VC C -1V ~ 0.3V GND
O U T1 or O U T2 O U T1 or O U T2
Table1. Hall Sensor Outputs and Related Pin outputs IN1 L H IN2 H L LD Low Level Low Level OUT 1 H L OUT 2 L H FG H L L or H ROTATING LOCK Remark
4. Open Collector FG and 1/2FG Output for Speed Feedback
The FG output comes from the hall amplifier output. Because the FG output is open collector type, end user can pull up this pin with a external resistor to the supply voltage of their choice(that is 5 or 3.3V). This FG output signal has two pulses per revolution on a four pole motor and 1/2FG output signal has one pulse per revolution on a eight pole motor. It is recommended that this FG output be higher than the GND potential.
5. Supply Voltage Consideration
A supply sustain capacitor(CR) should be placed as close to VCC pin with GND as layout permits. A reverse supply protection diode(DR) prevent motor current from recirculating to power source when phase commutation occur. This results in increasing VCC pin voltage. This capacitor absorbs motor recirculating current and limits VCC pin voltage. In general, large motor winding inductance and current need large value of CR.
6. Thermal Shutdown
TSD on: Two high side outputs are off.(Typ. 175oC) TSD off:The circuit can be reactivated and begin to operate in a normal condition. (Typ. 150oC)
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FAN8463 Rev.1.0.0
rosneS
llaH
HR
1NI
1
rosneS
llaH
2HR
iR
FAN8463
1NI 1
iR
FAN8463
2NI 3
BH
2NI 3
2
case2
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FAN8463 BTL Single Phase Full Wave BLDC Motor Driver
Typical Application Circuits
V+ CR
VCC HB
8
GND
6
OUT1
2
Reference Out
360R
TSD
VCC
5
OUT2
V+ RH1 Hall Sensor RH2
IN1
7
R
1
1/2FG
360R
10
IN2
R
3
FG
9
LD
4
CLD
Lock detector & Auto restart
FG & 1/2FG
1 IN1 3 IN2
HB
* Internal HB bias
2
Hall Sensor RH
Recommended Parts Values
V+
5V 3.3V 0.33F
CLD
RH1
1K 1K
RH2
220 0
RH
220 150
Condition
Hall input impedance : Ri Hall output impedance : Ro Ri=Ro=300
* Resistor (RH1, RH2, RH) values depend on the motor.
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FAN8463 Rev.1.0.0
FAN8463 BTL Single Phase Full Wave BLDC Motor Driver
11
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FAN8463 Rev.1.0.0
FAN8463 BTL Single Phase Full Wave BLDC Motor Driver
Package dimensions
14-TSSOP
12
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FAN8463 Rev.1.0.0
FAN8463 BTL Single Phase Full Wave BLDC Motor Driver
Package Dimensions (Unit: mm)
10MLP
FAN8463 Rev. 1.0.0
13
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TRADEMARKS
The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks.
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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 CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 2. A critical component is any component of a life 1. Life support devices or systems are devices or support device or system whose failure to perform can systems which, (a) are intended for surgical implant into be reasonably expected to cause the failure of the life the body, or (b) support or sustain life, or (c) whose support device or system, or to affect its safety or failure to perform when properly used in accordance with instructions for use provided in the labeling, can be effectiveness. reasonably expected to result in significant injury to the user. PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Advance Information Product Status Formative or In Design Definition This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. This datasheet contains preliminary data, and supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design.
Preliminary
First Production
No Identification Needed
Full Production
Obsolete
Not In Production
This datasheet contains specifications on a product that has been discontinued by Fairchild semiconductor. The datasheet is printed for reference information only.
Rev. I15

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