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PDF MTD6505 Data sheet ( Hoja de datos )
| Número de pieza | MTD6505 | |
| Descripción | 3-Phase Sinusoidal Sensorless Brushless Motor Driver | |
| Fabricantes | Microchip | |
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MTD6505
3-Phase Sinusoidal Sensorless Brushless Motor Driver
Features
• 180° Sinusoidal Drive for High Efficiency and Low
Acoustic Noise
• Position Sensorless BLDC Drivers
(no Hall Effect Sensor required)
• Integrated Power Transistors
• Supports 2V to 5.5V Power Supplies
• Programming Resistor (RPROG) Settings to Fit
Motor Constant (KM) Range from 3.25 mV/Hz to
52 mV/Hz
• Direction Control:
- Forward direction: connect DIR pin to GND or
leave floating
- Reverse direction: connect DIR pin to VBIAS
or 3V
• Speed Control through Power Supply Modulation
(PSM) and/or Pulse-Width Modulation (PWM)
• Built-in Frequency Generator (FG Output Signal)
• Built-in Lockup Protection and Automatic
Recovery Circuit
• Built-in Overcurrent Limitation
• Built-in Thermal Shutdown Protection
• Built-in Overvoltage Protection
• No External Tuning Required
• Available Package:
10-Lead 3mm x 3mm UDFN
Applications
• Notebook CPU Cooling Fans
• 5V 3-Phase BLDC
Description
The MTD6505 device is a 3-phase, full-wave
sensorless driver for brushless DC (BLDC) motors. It
features 180° sinusoidal drive, high-torque output and
silent drive. With the adaptive features, parameters and
wide range of power supplies (2V to 5.5V), the
MTD6505 is intended to cover a broad range of motor
characteristics, while requiring minimum external
components. Speed control can be achieved through
either PSM or PWM.
The compact packaging and the minimal bill of
materials make the MTD6505 device extremely
cost-efficient in fan applications. For example, the CPU
cooling fans in notebook computers require designs
that provide low acoustic noise, low mechanical
vibration, and are highly efficient. The frequency
generator (FG) output enables precision speed control
in closed-loop applications.
The MTD6505 device includes Lockup Protection mode
to turn off the output current when the motor is in a lock
condition, with an automatic recovery feature to restart
the fan when the lock condition is removed. Motor
overcurrent limitation and thermal shutdown protection
are included for safety-enhanced operations.
The MTD6505 is available in a compact, thermally-
enhanced, 10-lead 3 mm x 3 mm UDFN package.
Package Types
MTD6505
3x3 UDFN*
FG 1
RPROG 2
VBIAS 3
OUT1 4
OUT2 5
10 PWM
EP 9 DIR
11 8 VDD
7 OUT3
6 GND
*Includes Exposed Thermal Pad (EP); see Table 3-1.
2011-2014 Microchip Technology Inc.
DS20002281C-page 1
1 page  
MTD6505
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings†
Power Supply Voltage (VDD_MAX) ...................... -0.7 to +7.0V
Maximum Output Voltage (VOUT_MAX) ............... -0.7 to +7.0V
Maximum Output Current(1) (IOUT_MAX) ....................1000 mA
FG Maximum Output Voltage (VFG_MAX) ........... -0.7 to +7.0V
FG Maximum Output Current (IFG_MAX) ......................5.0 mA
VBIAS Maximum Voltage (VBIAS_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
ESD protection on all pins 2 kV
ELECTRICAL CHARACTERISTICS
† 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.
Note 1: IOUT is also internally limited, according
to the limits defined in the “Electrical
Characteristics” table.
2: Reference Printed Circuit Board (PCB),
according to JEDEC standard EIA/JESD
51-9.
Electrical Specifications: Unless otherwise specified, all limits are established for VDD = 2.0V to 5.5V, TA = +25°C
Parameters
Sym.
Min.
Typ.
Max. Units
Conditions
Power Supply Voltage
Power Supply Current
Standby Current
VDD
IVDD
IVDD_STB
2
—
—
— 5.5 V
5 10 mA VDD = 5V
30 40 µA PWM = 0V, VDD = 5V
(Standby mode)
OUTX
High Resistance
RON(H)
—
0.75 1.1
Ω IOUT = 0.5A, VDD = 5V
Note 1
OUTX
Low Resistance
RON(L)
—
0.75 1.3
Ω IOUT = 0.5A, VDD = 5V
Note 1
OUTX
Total Resistance
RON(H+L)
—
1.5 2.4 Ω IOUT = 0.5A, VDD = 5V
Note 1
VBIAS Internal
Supply Voltage
VBIAS
— 3—
—
VDD – 0.2
—
V VDD = 3.2V to 5.5V
V VDD < 3.2V
PWM Input Frequency
fPWM
1
— 100 kHz
PWM Input H Level
VPWM_H 0.55 VDD
—
VDD
V VDD 4.5V
PWM Input L Level
VPWM_L
0
— 0.2 VDD V VDD 4.5V
PWM Internal Pull-Up
Resistor
RPWM_0
—
266 — kΩ PWM = 0V
PWM Internal Pull-Up
Resistor
RPWM
—
133 — kΩ PWM duty-cycle > 0%
DIR Input H Level
VDIR_H VBIAS – 0.5
—
VBIAS
V VDD 4.5V
DIR Input L Level
VDIR_L
0
— 0.2 VDD V VDD 4.5V
DIR Internal Pull-Down
Resistor
RDIR
100
— 200 kΩ
FG Output Pin Low-
Level Voltage
VOL_FG
—
—
0.25
V IFG = -1 mA
FG Output Pin Leakage ILH_FG
– 10
—
10 µA VFG = 5.5V
Current
Lock Protection
Operating Time
TRUN
—
0.5 — s
Lock Protection Waiting
Time
TWAIT
4.5
5 5.5 s Note 2
Overcurrent Protection
Overvoltage Protection
IOC_MOT
VOV
—
—
750 — mA Note 3
7.2 — V
2011-2014 Microchip Technology Inc.
DS20002281C-page 5
5 Page 
4.0 FUNCTIONAL DESCRIPTION
The MTD6505 generates a full-wave signal to drive a
3-phase BLDC motor. High efficiency and low power
consumption are achieved due to CMOS transistors
and synchronous rectification drive type.
4.1 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 (VDD). When the PWM
signal is High (or left open), the motor rotates at full
speed. When the PWM signal is low, the IC outputs are
set to high-impedance and the motor is stopped.
By changing the PWM duty cycle, the speed can be
adjusted. Thus, the user has freedom to choose the
PWM system frequency within a wide range (from
1 kHz to 100 kHz).
Since the PWM pin has an internal pull-up resistor
connected to VDD, it is recommended to drive it
between 0V and high Z. The PWM driver must be able
to support the pull-up resistor current to drive the pin.
See “PWM Internal Pull-Up Resistor” in Section 1.0,
Electrical Characteristics.
The output transistor activation always occurs at a fixed
rate of 30 kHz, which is outside the range of audible
frequencies.
Note 1: The PWM frequency has no direct effect
on the motor speed and is asynchronous
with the activation of the output transistors.
2: The standard output frequency is 30 kHz.
A 20 kHz output frequency option is
available upon request.
4.2 Motor Rotation Direction
The current-carrying order of the outputs depends on
the DIR pin state (“Rotation Direction”) and is illustrated
in Table 4-1. The DIR pin is not designed for dynamic
direction change during operation.
TABLE 4-1:
MOTOR ROTATION
DIRECTION OPTIONS
(DIR PIN)
DIR Pin State
Rotation
Direction
Outputs Activation
Sequence
Connected
to GND
or Floating
Connected
to VBIAS
Forward OUT1 OUT2 OUT3
Reverse OUT3 OUT2 OUT1
MTD6505
4.3 Frequency Generator Function
The Frequency Generator output (FG) is a “Hall Effect
Sensor equivalent” digital output, giving information to
an external controller about the speed and phase of the
motor. The FG pin is an open-drain output, connecting
to a logical voltage level through an external pull-up
resistor. When a lock or an out-of-sync situation is
detected by the driver, this output is set to
high-impedance until the motor is restarted. Leave the
pin open when it is not used.
4.4 Lock-Up Protection and Automatic
Restart
If the motor is blocked and cannot rotate freely, a
lock-up protection circuit detects it and disables the
driver by setting its outputs to high-impedance 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 required.
4.5 Overcurrent Protection
The motor peak current is limited by the driver to
750 mA (standard value), thus limiting the maximum
power dissipation in the coils.
4.6 Thermal Shutdown
The MTD6505 device has a thermal protection function
which detects when the die temperature exceeds
TJ = +170°C. When this temperature is reached, the
circuit enters Thermal Shutdown mode, and outputs
OUT1, OUT2 and OUT3 are disabled (high-imped-
ance), avoiding IC destruction and allowing the circuit
to cool down. When the junction temperature (TJ) drops
below +145°C, normal operation resumes.
The thermal detection circuit has +25°C hysteresis.
Thermal shutdown
Normal
operation
+145°
+170°
TJ
FIGURE 4-1:
Hysteresis.
Thermal Protection
2011-2014 Microchip Technology Inc.
DS20002281C-page 11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet MTD6505.PDF ] | |
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