MP6505 - Monolithic Power System

MP6505
4.5V-to-16V,400mA, Single-Phase
Brushless-DC–Motor Driver
The Future of Analog IC Technology
FEATURES
DESCRIPTION
The MP6505 is a single-phase brushless-DC–
motor driver, with an input voltage range of 4.5V
to 16V and a maximum output current of 400mA.
The MP6505 controls the rotational speed
through either the input voltage or the PWM
signal. Other features include minimumrotational–speed set, a rotational speed indicator,
built-in input over-voltage protection, built-in
locked-rotor
protection,
locked-rotor–state
indicator, thermal shutdown, and a 1.2V
integrated Hall bias voltage.
The MP6505 is available in 5.0mm×6.4mm
TSSOP16 and 3mm×3mm QFN16 package.
• Operating Voltage of 4.5V to 16V
• Integrated Power MOSFETs (HS: 370mΩ; LS:
230mΩ)
• Maximum Output Current 400mA
• Low Quiescent Current (Not including Hall
Sensor) of 1.4mA
• Speed Control by Input Voltage or PWM Signal
• Programmable Minimum Speed
• Rotational-Speed Indicator
• Locked-Rotor Indicator
• Locked-Rotor Protection and Automatic
Recovery
• Thermal Protection and Automatic Recovery
• Built-In Input OVP and Automatic Recovery
• Hall Bias Voltage(1.2V) Integrated
• Available in TSSOP16 (5.0×6.4mm) and QFN16
(3×3mm) Package
APPLICATIONS
• CPU Fan for Personal Computers or Servers
• Brushless DC Motor Driver
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
Motor
VIN
GND
D1
R1
CIN
P-GND
P-GND
P-GND S-GND
OUT1
OUT2
VCC
S-GND
CT
RMI
R3
R2
VTH
R4
CP=100pF
V IN
R5
MP6505
CT=0.47µF
to 1µF
VREF
COSC
IN-
FG
HB
RD
IN+
Hall
R6
MP6505 Rev. 1.01
4/14/2014
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
1
MP6505-SINGLE-PHASE, BRUSHLESS-DC–MOTOR DRIVER
ORDERING INFORMATION
Part Number
MP6505DM*
MP6505DQ**
Package
TSSOP16(5.0×6.4mm)
QFN16(3×3mm)
Top Marking
MP6505
ADB
* For Tape & Reel, add suffix –Z (eg. MP6505DM–Z);
For RoHS compliant packaging, add suffix –LF (e.g. MP6505DM–LF–Z)
* For Tape & Reel, add suffix –Z (eg. MP6505DQ–Z);
For RoHS compliant packaging, add suffix –LF (e.g. MP6505DQ–LF–Z)
PACKAGE REFERENCE
TOP VIEW
TOP VIEW
PIN 1 ID
P-GND
1
16
P-GND
OUT1
2
15
OUT2
VCC
3
14
S-GND
RMI
1
RMI
4
13
CT
VTH
2
VTH
5
12
VREF
COSC
6
11
IN-
FG
7
10
HB
9
IN+
MP6505
RD
8
TSSOP16
VCC .................................................... 0V to 20V
OUT1, OUT2 .................................... -1V to 20V
FG, RD .......................................... -0.3V to 18V
All other Pins ................................ -0.3V to 6.5V
(2)
Continuous Power Dissipation (TA = 25°C)
TSSOP16 ................................................ 1.17W
QFN16 ..................................................... 1.75W
Junction Temperature .............................. 150°C
Storage Temperature ............... -55°C to +150°C
(3)
VCC ................................................. 4.5V to 16V
VTH ..................................................... 0V to 6V
IN+, IN- ............................................. 0.2V to 3V
Operating Junction Temp. (TJ). -40°C to +125°C
MP6505 Rev. 1.01
4/14/2014
16
15
14
13
12 OUT2
11 SGND
MP6505
COSC
3
FG
4
10
CT
9 VREF
5
6
8
7
RD
IN+
HB
EXPOSED PAD ON BACKSIDE
NOT CONNECTED
IN-
QFN16
ABSOLUTE MAXIMUM RATINGS(1)
Recommended Operating Conditions
OUT1 PGND VCC PGND
Thermal Resistance
(4)
θJA
θJC
TSSOP16 (5.0×6.4mm) .......... 90 ...... 30 ... °C/W
QFN16 (3×3mm)..................... 60 ...... 12 ... °C/W
Notes:
1) Exceeding these ratings may damage the device.
2) The maximum allowable power dissipation is a function of the
maximum junction temperature TJ (MAX), the junction-toambient thermal resistance θJA, and the ambient temperature
TA. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by PD (MAX) = (TJ
(MAX)-TA)/θJA. Exceeding the maximum allowable power
dissipation will cause excessive die temperature, and the
regulator will go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
3) The device is not guaranteed to function outside of its
operating conditions.(For Vcc voltage range, it doesn’t include
the external input diode voltage drop)
4) Measured on JESD51-7, 4-layer PCB.
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
2
MP6505-SINGLE-PHASE, BRUSHLESS-DC–MOTOR DRIVER
ELECTRICAL CHARACTERICS
TA=25°C, VCC=12V, unless otherwise noted.
Parameter
Circuit Current in Locked-Rotor
Protection Mode
Reference Voltage
HB Voltage
COSC HIGH Voltage
COSC LOW Voltage
COSC Oscillator Frequency
CT Pin HIGH Voltage
CT Pin LOW Voltage
ICT Charge Current
ICT Discharge Current
ICT Charge/Discharge Ratio
High-Side Switch-On Resistance
Symbol
VCOSC H
VCOSC L
fCOSC
VCTH
VCTL
ICT1
ICT2
rCT
RDS1
Low-Side Switch-On Resistance
RDS2
Current Limit Gain
Current Limit
VREF
VHB
Min
Typ
Max
Unit
VCC=20V
1.0
1.4
2
mA
IVREF=5mA
IHB=5mA
5.6
1.1
3.45
1.8
26.4
3.4
1.63
1.1
0.08
7
6.2
1.2
3.75
2.1
35.6
3.86
1.83
2.85
0.25
18
420
V
V
V
V
kHz
V
V
μA
μA
VCC=12V TA=25°C
5.9
1.15
3.6
1.95
31
3.63
1.73
1.95
0.16
12
370
VCC=12V TA=25°C
230
260
mΩ
CP=100pF
GC
IPEAK
Under-Voltage Lockout Threshold—
Rising
Under-Voltage Lockout Threshold—
Hysteresis
RD/FG Output Pin Low-Level
Voltage
RD/FG Output Pin Leakage Current
OVP Threshold Rising
OVP Threshold Hysteresis
MP6505 Rev. 1.01
4/14/2014
ICC
Condition
9
A/V
IN+ – IN- =±50mV
0.4
0.7
1.3
IN+ – IN- =±100mV
0.8
1
1.8
3.57
3.75
3.93
190
VRDL/FGL
IRD/FG=5mA
VRDL/FGL
VRD/FG=12V
19
0.1
20
1.7
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
mΩ
A
V
mV
0.35
V
1
21
μA
V
V
3
MP6505-SINGLE-PHASE, BRUSHLESS-DC–MOTOR DRIVER
PIN FUNCTIONS
Pin #
(TSSOP16)
Pin #
(QFN16)
Name
Description
1,16
2
3
4
5
13,15
16
14
1
2
P-GND
OUT1
VCC
RMI
VTH
6
3
COSC
7
4
FG
8
5
RD
9
10
6
7
IN+
HB
Power Ground.
Motor Driver Output 1.
Power Supply.
Minimum Rotational Speed Set.
Rotational Speed Control. Use DC voltage or PWM signal.
Oscillator Setting. Connect this pin to an external capacitor to set the
switch frequency.
Rotational Speed Detector. Connect to an external power source through
a pull-up resistor.
Locked-Rotor Protection Detector. Connect to an external power source
through a pull-up resistor.
Hall Sensor Input+. For rotor position detection and current limit setting.
Hall Sensor Bias Regulator Output. Powers the external Hall sensor.
11
12
8
9
INVREF
13
10
CT
14
15
11
12
Exposed
Pad
S-GND
OUT2
MP6505 Rev. 1.01
4/14/2014
NC
Hall Sensor Input-. For rotor position detection and current limit setting.
Reference Voltage Output.
Locked-Rotor Protection and Recovery Time Set. Connect to an external
capacitor to set the recovery time.
Ground for Control Circuit.
Motor Driver Output 2.
Not Connected. Connect exposed thermal pad to power ground for better
thermal performance.
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
4
MP6505-SINGLE-PHASE, BRUSHLESS-DC–MOTOR DRIVER
TYPICAL CHARACTERISTICS
VIN=12V, fCOSC=30kHz
UVLO vs. Temperature
ICC vs. Temperature
3.75
VCC Breakdown Voltage vs.
Temperature
1.60
26.0
25.5
1.55
3.72
3.71
25.0
VCC BV (V)
3.73
ICC (mA)
UVLO (V)
3.74
1.50
24.5
24.0
23.5
1.45
23.0
1.40
-40 -20 0
22.0
-40 -20
22.5
3.70
-40 -20 0 20 40 60 80 100 120 140
VHB vs. Temperature
1.17
6.000
1.166
5.975
1.162
5.950
1.158
31.0
VHB (V)
FREQUENCY (kHz)
31.5
30.5
30.0
1.154
1.150
1.146
1.142
0 20 40 60 80 100120140
MP6505 Rev. 1.01
4/14/2014
1.13
-40 -20 0
5.900
5.875
5.825
1.134
29.0
-40 -20
5.925
5.850
1.138
29.5
0 20 40 60 80 100120 140
VREF vs. Temperature
VREF (V)
32.0
Frequency vs.
Temperature
20 40 60 80 100 120140
20 40 60 80 100 120140
5.800
-40 -20 0 20 40 60 80 100 120 140
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
5
MP6505-SINGLE-PHASE BRUSHLESS DC MOTOR DRIVER
TYPICAL PERFORMANCE CHARACTERISTICS
fCOSC=30kHz, CT=1μF, VTH=0V, VIN=12V, CIN=10μF, Lmotor=5mH, Rmotor=10Ω, TA=25°C, unless
otherwise noted.
Steady State
Locked-rotor Protection
VOUT1
10V/div.
VOUT2
10V/div.
VOUT1
10V/div.
VOUT2
10V/div.
VRD
5V/div.
VFG
5V/div.
IOUT
1A/div.
IOUT
1A/div.
Power Ramp Up
VOUT1
10V/div.
VOUT2
10V/div.
VIN
10V/div.
IOUT
2A/div.
Power Ramp Down
VOUT1
10V/div.
VOUT2
10V/div.
VIN
10V/div.
IOUT
1A/div.
MP6505 Rev. 1.01
www.MonolithicPower.com
4/14/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
6
MP6505-SINGLE-PHASE BRUSHLESS DC MOTOR DRIVER
BLOCK DIAGRAM
FG
RD
Thermal
Protection
OCP
COMP
VCC
Regulator
Circuit
HB
PMOS
PMOS
6V VREF
Drive Circuit 1
1.2V
OVP
Protection
Control
OUT1
Circuit
NMOS
Hall Signal
Comparator
IN+
OUT2
NMOS
Drive Circuit 2
IN-
Current Sense
Amplifier
Hall Signal
Amplifier
Oscillator
Circuit
Charge /Disc
harge Circuit
CT
S-GND
VTH RMI
Σ
RAMP
COSC
P-GND
Figure 1: Functional Block Diagram
MP6505 Rev. 1.01
www.MonolithicPower.com
4/14/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
7
MP6505-SINGLE-PHASE BRUSHLESS DC MOTOR DRIVER
FUNCTION DESCRIPTION
Motor Driver
The OUT1 and OUT2 pins drive the motor with a
maximum continuous output current of 400mA at
room temperature. The peak output current value
is proportional to the Hall sensor output voltage
of (VIN+–VIN-).
Frequency Setting
A capacitor at the COSC pin sets the frequency.
For most applications, use a 100pF capacitor for
a typical PWM frequency of 30kHz.
Minimum Speed
The voltage on RMI pin sets the minimum PWM
duty cycle, which sets the lowest speed. Connect
to VTH if not used.
Locked-Rotor Detection
The RD pin is the locked-rotor detector, and is
the output of an open collector. It goes low when
the motor rotates and goes into high impendence
if the motor is in a locked-rotor state. Leave it
open if not used.
Speed Detection
The rotational speed detector (the FG pin) is the
output of an open collector. It outputs a high or
low voltage relative to the Hall comparator’s
output. Higher speeds produce higher-frequency
signals. Leave it open if not used.
Current Limit and the Hall Signal
An internal amplifier with hysteresis amplifies the
differential Hall signal: The output of this amplifier
serves as the current-limit value. The differential
Hall voltage drops to 0V whenever an opposing
magnet passes the Hall sensor to limit the peak
current during commutation. The Hall sensor is
directly powered by a 1.2V voltage on the HB pin.
The Hall senor input sensitivity accepted by the
part is down to 3mV.
Input Over-Voltage Protection
The reverse current generated with every
commutation charges the input capacitor and
causes a periodic voltage spike at the input pin.
The internal input over-voltage protection (OVP)
circuit turns off two HS switches when a spike
exceeds 20V, and recovers from OVP when the
spike is less than 18V.
Over Temperature Protection
The MOSFET is shutdown when the temperature
exceeds about 175oC and resumes working once
the temperature is below about 155oC.
Working Mode
The driver has operates in one of four modes
under normal conditions, as shown in Figure 2.
The following describes each mode:
• Minimum Speed Mode
This mode runs the motor at the slowest
motor speed. It uses a thermistor to provide
the VTH signal and compares it against RMI
to determine the slowest motor speed.
At low temperatures, VTH exceeds RMI. The
device compares VCOSC against RMI to
generate a PWM signal, PWM-RMI, to control
the motor speed. Removing the thermistor
causes VTH and the motor speed to reach
their respective maxima and minima.
•
Variable Speed Mode
When the VTH signal falls below RMI, the
device compares VCOSC against VTH to generate
a PWM signal of PWM-VTH to control the motor
speed. In general, VTH controls the PWM duty
cycle, and therefore the motor speed.
•
Full-Speed Mode
When the VTH signal is less than VCOSC(MIN),
the PWM duty is 100% and the motor speed
is at its maximum.
•
Locked-Rotor–Protection Mode
An internal current source, ICT1, charges the
capacitor at the CT pin; changing the Hall
comparator’s output provides a reset signal to
drive an internal switch to discharge this
capacitor to VCTL.
If the motor rotor is locked, the Hall comparator’s
output will not change. Once the voltage on the
capacitor goes to VCTH, the driver enters lockedrotor–protection mode and another current source,
ICT2, discharges the CT capacitor. During this period,
the PWM duty cycle goes to 0% and the RD pin is
in a high-impedance state. When the voltage on the
capacitor drops to 0V, ICT1 charges the capacitor
again. The PWM signal resumes switching to try to
drive motor again. If the rotor remains locked, the
process repeats.
MP6505 Rev. 1.01
www.MonolithicPower.com
4/14/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
8
MP6505-SINGLE-PHASE BRUSHLESS DC MOTOR DRIVER
VTH
Vcosc(max)
3.6V
RMI
Vcosc
2V
Vcosc(min)
Minimum
speed mode
Variable speed
mode
Locked-rotor
protection mode
Full speed mode
FG
VCTH(3.6V)
CT
VCTL(1.7V)
RD
High impedance
High
impedance
High impedance
Low level
Ton
Rotating
Toff
Lock protection mode (Toff=5Ton)
Figure 2: Driver Operation Mode
MP6505 Rev. 1.01
www.MonolithicPower.com
4/14/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
9
MP6505-SINGLE-PHASE BRUSHLESS DC MOTOR DRIVER
APPLICATION INFORMATION
Selecting the Input Capacitor
The input capacitor absorbs excess armature
inductor energy with every commutation. For
typical applications, select CIN≥10µF to provide a
margin of safety for input OVP. Motors with larger
armature inductors require larger input capacitors.
Design Example
Below is an example design that follows the
application guidelines for the given specifications:
VIN
4.5V to 16V
IOUT(Max)
400mA
fCOSC
30kHz
Setting the Frequency
For most applications, use a 100pF capacitor for
the CP capacitor to set the frequency to 30kHz.
fCOSC is determined by:
Figure 4 shows a detailed application schematic.
For more applications, please refer to the related
Evaluation Board Data Sheets.
Motor
fOSC = 3 × 10 −6 / CP (Hz)
Connecting the Motor
Figure 3 shows that the OUT1 and OUT2
connect to the motor armature: When VIN+
exceeds VIN-, SW1 and SW4 activate and current
flows from OUT1 to OUT2; When VIN- exceeds
VIN+, SW2 and SW3 activate and current flows
from OUT2 to OUT1. The opposing current
directions generate opposing polarities in the
armature winding. For most applications,
carefully connect OUT1 and OUT2 to the motor
terminators according to the Hall sensor setting
position. Incorrect connections will cause
abnormal motor function.
P-GND
P-GND
VIN
D1
B130LAW-7-F
CIN
10uF
GND
VTH
R8
1kO
R7
0O
CP=100pF
VIN
R 5 10kO
OUT1
OUT2
VCC
S-GND
CT
RMI
VTH
MP6505
CT=1µF
VREF
COSC
IN-
FG
HB
RD
IN+
Hall
R 6 10kO
Figure 4: Detailed Application Schematic
V cc
S W1
OUT 1
S W3
B rus hles s DC
Motor
M
S W2
OUT2
S W4
Figure 3: Power Stage
MP6505 Rev. 1.01
www.MonolithicPower.com
4/14/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
10
MP6505-SINGLE-PHASE BRUSHLESS DC MOTOR DRIVER
PACKAGE INFORMATION
QFN 16 (3X3mm)
2.90
3.10
0.30
0.50
PIN 1 ID
MARKING
0.18
0.30
2.90
3.10
PIN 1 ID
INDEX AREA
1.50
1.80
13
16
12
PIN 1 ID
SEE DETAIL A
1
1.50
1.80
0.50
BSC
4
9
5
8
TOP VIEW
BOTTOM VIEW
PIN 1 ID OPTION A
0.30x45º TYP.
PIN 1 ID OPTION B
R0.20 TYP.
0.80
1.00
0.20 REF
0.00
0.05
DETAIL A
SIDE VIEW
2.90
1.70
0.70
0.25
NOTE:
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH.
3) LEAD COPLANARITY SHALL BE0.10 MILLIMETER MAX.
4) DRAWING CONFORMS TO JEDEC MO-220, VARIATION VEED-4.
5) DRAWING IS NOT TO SCALE.
0.50
RECOMMENDED LAND PATTERN
MP6505 Rev. 1.01
www.MonolithicPower.com
4/14/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
11
MP6505-SINGLE-PHASE, BRUSHLESS-DC–MOTOR DRIVER
PACKAGE INFORMATION
TSSOP16 (5.0X6.4mm)
0.40
TYP
4.90
5.10
16
9
1.60
TYP
4.30
4.50
PIN 1 ID
1
0.65
BSC
5.80
TYP
6.20
6.60
8
TOP VIEW
RECOMMENDED LAND PATTERN
0.80
1.05
1.20 MAX
SEATING PLANE
0.19
0.30
0.65 BSC
0.05
0.15
0.09
0.20
SEE DETAIL "A"
FRONT VIEW
SIDE VIEW
NOTE:
GAUGE PLANE
0.25 BSC
0o -8o
0.45
0.75
DETAIL “A”
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) PACKAGE LENGTH DOES NOT INCLUDE MOLD FLASH
,
PROTRUSION OR GATE BURR.
3) PACKAGE WIDTH DOES NOT INCLUDE INTERLEAD FLASH
OR PROTRUSION.
4) LEAD COPLANARITY(BOTTOM OF LEADS AFTER FORMING)
SHALL BE 0.10 MILLIMETERS MAX.
5) DRAWING CONFORMS TO JEDEC MO-153, VARIATION AB.
6) DRAWING IS NOT TO SCALE.
NOTICE: The information in this document is subject to change without notice. Users should warrant and guarantee that third
party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not
assume any legal responsibility for any said applications.
MP6505 Rev. 1.01
www.MonolithicPower.com
4/14/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
12
Download PDF