MTD6502B [MICROCHIP]
5V 3-Phase BLDC Sinusoidal Sensorless Fan Motor Driver; 5V三相BLDC正弦无传感器风扇电机驱动器
| 型号： | MTD6502B |
| 厂家： | 
MICROCHIP |
| 描述： | 5V 3-Phase BLDC Sinusoidal Sensorless Fan Motor Driver |
| 文件： | 总20页 (文件大小：305K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MTD6502B
5V 3-Phase BLDC Sinusoidal Sensorless Fan Motor Driver
Features:
Description:
• Position Sensorless BLDC Drivers
(No Hall Sensor Required)
The MTD6502B device is a 3-phase full-wave driver for
brushless sensorless DC motors. It features 180°
sinusoidal drive, high torque output and silent drive.
With adaptive features, parameters and a wide range
of power-supplies (2V to 5.5V), the MTD6502B device
• 180° Sinusoidal Drive, for High Efficiency and Low
Acoustic Noise
• Support 2V to 5.5V Power Supplies
• Direction Control:
is intended to cover
a wide range of motor
characteristics, while requiring minimum external com-
ponents. Speed control can be achieved through either
power supply modulation or pulse-width modulation
(using the PWM digital input pin).
- Forward direction: connect DIR pin to GND or
leave floating
- Reverse direction: connect DIR pin to VDD
• Speed Control through Power Supply Modulation
(PSM) and/or Pulse-Width Modulation (PWM)
With the compact packaging and minimum bill-of-
material (integrated power transistors, no Hall sensor,
no external tuning), the MTD6502B is best suited for
low-cost fan applications requiring high efficiency and
low acoustic noise, such as notebook CPU cooling
fans. Frequency generator (FG) output enables the
precision speed control in closed-loop applications.
The MTD6502B driver includes a lock-up protection
mode, which turns off the output current when the
motor is under lock condition, and an automatic recov-
ery that enables the fan to run when the lock condition
is removed. The motor overcurrent limitation and ther-
mal-shutdown protection are included for safety-
enhanced operations.
• Built-in Frequency Generator (FG Output Signal)
• Built-in Lock-up Protection and Automatic
Recovery Circuit (External Capacitor not
Necessary)
• Built-in Over Current Limitation
• Built-in Thermal Shutdown Protection
• No External Tuning Required
• Available Packages:
- 3 mm x 3 mm TDFN-10
Applications:
The MTD6502B is available in a compact thermally-
enhanced 3 mm x 3 mm TDFN package.
• Notebook CPU Cooling Fans
• 5V 3-Phase Brushless DC Motors
Package Types
MTD6502B
3x3 TDFN*
10
9
FG
PWM
DIR
1
2
GND
EP
11
V
8 V
CC
3
4
5
DD
OUT1
OUT2
OUT3
7
6
GND
* Includes Exposed Thermal Pad (EP); see Table 2-1.
2011 Microchip Technology Inc.
DS25003A-page 1
MTD6502B
Functional Block Diagram
VCC
VREF
Motor Phase
Detection Circuit
Regulator
VDD
Over-current
protection
VCC
FG
VCC
OUT3
OUT2
OUT1
PWM
DIR
Controller
GND
Thermal
protection
Short-circuit
protection
DS25003A-page 2
2011 Microchip Technology Inc.
MTD6502B
Typical Application
MCU Side
(Vlogic)
PWM Input
(1-100 kHz)
R1
1
2
3
4
5
10
PWM
DIR
FG
9
8
7
6
GND
VCC
VDD
VCC
C1
OUT1
OUT2
OUT3
GND
C2
Recommended External Components for Typical Application
Element
Type/Value
Comment
C1
C2
R1
1 µF
1 µF
Connect as close as possible to IC input pins
Connect as close as possible to IC input pins
Connect to Vlogic on microcontroller side
10 kΩ
2011 Microchip Technology Inc.
DS25003A-page 3
MTD6502B
NOTES:
DS25003A-page 4
2011 Microchip Technology Inc.
MTD6502B
† Notice: Stresses above those listed under “Maximum
Ratings” may cause permanent damage to the device. This is
a stress rating only and functional operation of the device at
those or any other conditions above those indicated in the
operational listings of this specification is not implied.
Exposure to maximum rating conditions for extended periods
may affect device reliability.
1.0
ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings†
Power Supply Voltage (VCC_MAX) ...................... -0.7 to +7.0V
Maximum Output Voltage (VOUT_MAX)............... -0.7 to +7.0V
Maximum Output Current(2) (IOUT_MAX)....................1000 mA
FG Maximum Output Voltage (VFG_MAX) ........... -0.7 to +7.0V
FG Maximum Output Current (IFG_MAX).....................5.0 mA
Note 1: Reference PCB, according to JEDEC
standard EIA/JESD 51-9.
2: IOUT is also internally limited, according
to limits defined in the Electrical Charac-
teristics.
V
DD Maximum Voltage (VDD_MAX) ..................... -0.7 to +4.0V
PWM Maximum Voltage (VPWM_MAX) ................ -0.7 to +7.0V
Allowable Power Dissipation(2)(PD_MAX).........................1.5W
Maximum Junction Temperature (TJ)..........................+150°C
ELECTRICAL CHARACTERISTICS
Electrical Specifications: Unless otherwise specified, all limits are established for TA = +25°C
Parameters
Sym
Min
Typ
Max
Units
Conditions
Power Supply Voltage
Power Supply Current
OUTx High Resistance
OUTx Low Resistance
OUTx Total Resistance
VDD Output Voltage
VCC
IVCC
2
—
50
5.5
—
V
µA
Ω
—
—
—
—
—
—
1
PWM = 0, VCC = 5V
IOUT = 0.5A, VCC = 5V
IOUT = 0.5A, VCC = 5V
IOUT = 0.5A, VCC = 5V
VCC = 3.3V to 5.5V
VCC < 3.3V
RON(H)
RON(L)
RON(H+L)
VDD
0.75
0.75
1.5
3
1
1
Ω
2
Ω
—
V
VCC – 0.2
—
—
V
PWM Input Frequency
PWM Input H Level
fPWM
100
VCC
0.2*VCC
55
kHz
V
VPWM_H 0.8*VCC
—
PWM Input L Level
VPWM_L
IPWM_L
IDIR
0
—
V
PWM Internal Pull-Up Current
DIR Internal Pull-Down Current
—
—
—
—
—
—
µA
µA
V
PWM = 0
20
—
FG Output Pin Low Level Voltage VOL_FG
—
0.25
10
IFG = -1 mA
VFG = 5.5V
FG Output Pin Leakage Current
ILH_FG
TRUN
—
µA
s
Lock Protection
Operating Time
0.5
—
Lock Protection Waiting Time
Overcurrent Protection
TWAIT
IOC_MOT
TSD
4.5
—
—
—
5
5.5
—
—
—
s
750
170
25
mA
°C
°C
Thermal Shutdown
Thermal Shutdown Hysteresis
TSD_HYS
2011 Microchip Technology Inc.
DS25003A-page 5
MTD6502B
TEMPERATURE SPECIFICATIONS
Electrical Specifications: Unless otherwise specified, all limits are established for VCC = 5.0V, TA = +25°C
Parameters
Sym
Min
Typ
Max
Units
Conditions
Temperature Ranges
Operating Temperature
TOPR
TSTG
-40
-55
—
—
+125
+150
°C
°C
Storage Temperature Range
Thermal Package Resistances
Thermal Resistance, 10L-TDFN
JA
—
68
—
°C/W
DS25003A-page 6
2011 Microchip Technology Inc.
MTD6502B
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
MTD6502B PIN FUNCTION TABLE
MTD6502B
3x3 TDFN
Type
Name
Function
1
2, 6
3
O
—
—
O
O
O
—
I
FG
GND
VDD
Motor speed indication output
Negative voltage supply (ground)
Internal regulator output (for decoupling only)
Single phase coil output pin
4
OUT1
OUT2
OUT3
VCC
5
Single phase coil output pin
7
Single phase coil output pin
8
Positive voltage supply for motor driver
Motor Rotation Direction:
9
DIR
- Forward direction: connect pin to GND or leave floating
- Reverse direction: connect pin to VDD
PWM input signal for speed control
Exposed Thermal Pad (EP)
10
11
I
PWM
EP
—
Legend: I = Input; O = Output
2011 Microchip Technology Inc.
DS25003A-page 7
MTD6502B
NOTES:
DS25003A-page 8
2011 Microchip Technology Inc.
MTD6502B
3.4
Lock-up Protection and Automatic
Restart
3.0
FUNCTIONAL DESCRIPTION
The MTD6502B generates a full-wave signal to drive a
3-phase sensorless BLDC motor. High efficiency and
low-power consumption are achieved due to the CMOS
transistors and synchronous rectification drive type.
If the motor is blocked and cannot rotate freely, a
lock-up protection circuit detects this situation and dis-
ables the driver (by setting its outputs to high-imped-
ance), in order to prevent the motor coil from burnout.
After a “waiting time” (TWAIT), the lock-up protection is
released and normal operation resumes for a given
time (TRUN). If the motor is still blocked, a new period
of waiting time is started. TWAIT and TRUN timings are
fixed internally, so that no external capacitor is needed.
3.1
Speed Control
The rotational speed of the motor can be controlled
either through the PWM digital input signal, or by acting
directly on the power supply (VCC). When the PWM sig-
nal is High (or left open), the motor rotates at full speed.
When the PWM signal is Low, the motor is stopped
(and the IC outputs are set to high-impedance). By
changing the PWM duty cycle, the speed can be
adjusted. Notice that the PWM frequency has no spe-
cial meaning for the motor speed and is asynchronous
with the activation of the output transistors. Thus, the
user has the maximum freedom to choose the PWM
system frequency within a wide range (from 1 kHz to
100 kHz), while the output transistor activation always
occurs at a fixed rate (20 kHz, or 30 kHz), which is out-
side of the range of audible frequencies.
3.5
Overcurrent Protection
The motor peak current is limited by the driver to a fixed
value (defined internally), thus limiting the maximum
power dissipation in the coils.
3.6
Thermal Shutdown
The MTD6502B has a thermal protection function
which detects when the die temperature exceeds
TJ = +170°C. When this temperature is reached, the
circuit enters the Thermal Shutdown mode, and the
outputs OUT1, OUT2 and OUT3 are disabled (high-
impedance), avoiding the IC destruction and allowing
the circuit to cool down. Once the junction temperature
(TJ) has dropped below +145°C, the normal operation
resumes (thermal detection circuit has +25°C hystere-
sis function).
Note:
The standard output frequency is 30 kHz.
The 20 kHz output frequency option is
available upon request.
3.2
Motor Rotation Direction
The current carrying order of the outputs depends on
the DIR pin state (Rotation Direction) according to
Table 3-1.
Thermal shutdown
TABLE 3-1:
MOTOR ROTATION
DIRECTION OPTIONS
(DIR PIN)
Normal
operation
Rotation
Direction
Outputs Activation
Sequence
DIR Pin State
TJ
+145°
+170°
Connected to
GND or
Floating
Forward OUT1 OUT2 OUT3
FIGURE 3-1:
Hysteresis.
Thermal Protection
Connected to
VDD
Reverse OUT3 OUT2 OUT1
3.7
Internal Voltage Regulator
VDD voltage is generated internally and is used to sup-
ply the internal logical blocks. The VDD pin is used to
connect an external decoupling capacitor (1 µF, or
higher). Notice that this pin is for IC internal use, and is
not designed to supply DC current to external blocks.
3.3
Frequency Generator Function
The Frequency Generator output (FG) is a “Hall-sensor
equivalent” digital output, that gives information to an
external controller about the speed and phase of the
motor. The FG pin is an open collector output, connect-
ing to a logical voltage level through an external pull-up
resistor. When a lock (or out-of-sync) situation is
detected by the driver, this output is set to high-imped-
ance until the motor is restarted. Leave the pin open
when not used.
Note:
FG/2 option is available upon request for
8-pole applications.
2011 Microchip Technology Inc.
DS25003A-page 9
MTD6502B
3.8
BEMF Coefficient Setting
Km is the electro-mechanical coupling coefficient of the
motor (also referred to as “motor constant” or “BEMF
constant”). Depending on the conventions in use, there
may be some inconsistency in the exact definition of
Km and its measurement criteria among different motor
manufacturers. In order to work with various motor
applications, the MTD6502B offers various options to
adopt a wide range of BEMF coefficient. The BEMF
coefficient (Km) is defined as the peak value of the
phase-to-phase BEMF voltage, normalized to the
electrical speed of the motor.
TABLE 3-2:
Km (mV/Hz) Range
Phase-to-Phase
KM OPTIONS
Option
Min
Max
3.25
6.5
13
6.5
13
26
0
1
2
DS25003A-page 10
2011 Microchip Technology Inc.
MTD6502B
4.0
4.1
PACKAGING INFORMATION
Package Marking Information
10-Lead TDFN (3x3x0.9 mm)
Example
XXXX
YYWW
NNN
AAAA
1104
256
PIN 1
PIN 1
Device
Code
MTD6502B-LC1-00
MTD6502B-LC1-01
MTD6502B-LC1-02
AAAA
AAAB
AAAC
Legend: XX...X Customer-specific information
Y
Year code (last digit of calendar year)
YY
WW
NNN
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
e
3
Pb-free JEDEC designator for Matte Tin (Sn)
*
This package is Pb-free. The Pb-free JEDEC designator (
can be found on the outer packaging for this package.
)
e3
Note: In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for customer-specific information.
2011 Microchip Technology Inc.
DS25003A-page 11
MTD6502B
Note: For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
DS25003A-page 12
2011 Microchip Technology Inc.
MTD6502B
Note: For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
2011 Microchip Technology Inc.
DS25003A-page 13
MTD6502B
NOTES:
DS25003A-page 14
2011 Microchip Technology Inc.
MTD6502B
APPENDIX A: REVISION HISTORY
Revision A (March 2011)
• Original Release of this Document.
2011 Microchip Technology Inc.
DS25003A-page 15
MTD6502B
NOTES:
DS25003A-page 16
2011 Microchip Technology Inc.
MTD6502B
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
PART NO.
Device
-X
XX
-XX
Examples:
Tape&Reel
Package Km Range
Value
a)
b)
c)
MTD6502B-LC1-00 Tape and Reel,
10LD TDFN Pkg,
Km Range Value = 0
Tape and Reel,
10LD TDFN Pkg,
Km Range Value = 1
MTD6502B-LC1-01
Device:
MTD6502B-L:
3-Phase BLDC Sinusoidal Sensorless Fan
Motor Driver (Tape and Reel)
MTD6502B-LC1-02
Tape and Reel,
10LD TDFN Pkg,
Km Range Value = 2
Package:
C1
=
Plastic Dual Flat, No Lead Package, 3x3x0.9 mm
Body (TDFN)
Km Range Value:
See Table 3-2 for details.
2011 Microchip Technology Inc.
DS25003A-page 17
MTD6502B
NOTES:
DS25003A-page 18
2011 Microchip Technology Inc.
MTD6502B
Note the following details of the code protection feature on Microchip devices:
•
Microchip products meet the specification contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
•
There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
•
•
Microchip is willing to work with the customer who is concerned about the integrity of their code.
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Information contained in this publication regarding device
applications and the like is provided only for your convenience
and may be superseded by updates. It is your responsibility to
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© 2011, Microchip Technology Incorporated, Printed in the
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Printed on recycled paper.
ISBN: 978-1-60932-991-4
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2011 Microchip Technology Inc.
DS25003A-page 19
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02/18/11
DS25003A-page 20
2011 Microchip Technology Inc.
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