View MLX90401_422326.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

MLX90401
Brushless DC Motor Controller Features and Benefits
* * * * * * * * 12V to 40V Operating Range On-Chip "Boost" Voltage Allows Use of All N-Channel Drivers Undervoltage Lockout On-Chip PWM Oscillator PWM Speed Control via Bottom Drivers Forward and Reverse Control BVDSS > 60V Selectable 60 or 120 Sensor Electrical Phasings
Applications
* Brushless DC Motor Control
Ordering Information
Part No. MLX90401 Temperature Suffix E(-40C to 85C) Package Code DF (24 Lead SOIC)
1. Pin connections
1 2 3 4 5 6 7 8 9 10 11 12 Supply Voltage VREF Out Hall "A" Input Hall "B" Input Hall "C" Input Fwd/Rev Input Speed Adjust Input / Disable Oscillator R/C /Brake Input Analog Ground 60/120 Select Input Power Ground Cap Boost "A" Gate Top "A" Feedback "A" Cap Boost "B" Gate Top "B" Feedback "B" Cap Boost "C" Gate Top "C" Feedback "C" Gate Bottom "A" Gate Bottom "B" Gate Bottom "C" 24 23 22 21 20 19 18 17 16 15 14 13
2. Description
The MLX90401 is a three-phase brushless DC motor controller, designed to meet the needs of o high volume, low cost motors with 60 or 120 electrical sensor phasings which do not require the expensive options needed for servo or other closed loop applications. The use of CMOS technology offers dense logic as well as high voltage (60V) driver capabilities. The use of discrete low cost N-channel power FETs reduces overall system cost and the device provides all of the logic necessary to interface Hall-effect position sensors to Nchannel power FETs. Upper N-channel power FETs require a gate drive in excess of the supply voltage V+, and with the device's on-chip "boost" voltage, the use of all N-Channel power FETs is allowed. Control inputs are provided for motor speed, forward or reverse direction, disable, and braking. Also 60 or 120 electrical sensor phasings can be set externally. The device is offered in a 24 Lead "Wide-Body" SOIC package (DF).
3901090401 Rev. 002
Page 1 of 12
Data Sheet Aug/02
MLX90401
Brushless DC Motor Controller
TABLE OF CONTENTS
FEATURES AND BENEFITS .................................................................................................................. 1 APPLICATIONS ...................................................................................................................................... 1 ORDERING INFORMATION.................................................................................................................... 1 1. 2. 3. 4. 5. 6. PIN CONNECTIONS ..................................................................................................................... 1-1 DESCRIPTION .............................................................................................................................. 2-1 MLX90401 ELECTRICAL SPECIFICATIONS ................................................................................... 3 BLOCK DIAGRAM ........................................................................................................................... 5 PIN FUNCTION DESCRIPTION ....................................................................................................... 6 GENERAL DESCRIPTION ............................................................................................................... 7 6.1. 6.2. 6.3. 6.4. 6.5. 6.6. 7. 8. 9. COMMUTATION DECODING AND OUTPUT CONTROL LOGIC ...........................................................................7 OSCILLATOR.............................................................................................................................................7 DISABLE...................................................................................................................................................7 PULSE WIDTH MODULATION ......................................................................................................................7 DRIVE OUTPUTS ........................................................................................................................................8 UNDERVOLTAGE LOCKOUT .......................................................................................................................8
LOGIC TABLE ................................................................................................................................. 9 ABSOLUTE MAXIMUM RATINGS ................................................................................................... 9 TYPICAL APPLICATION................................................................................................................ 10
10. APPLICATION COMMENTS .......................................................................................................... 10 10.1. DEMO BOARD .....................................................................................................................................10
11. RELIABILITY INFORMATION ........................................................................................................ 10 12. ESD PRECAUTIONS...................................................................................................................... 11 13. PACKAGE INFORMATION ............................................................................................................ 11 14. DISCLAIMER ................................................................................................................................. 12
3901090401 Rev. 002
Page 2-2 of 12
Data Sheet Aug/02
MLX90401
Brushless DC Motor Controller
3. MLX90401 Electrical Specifications
DC Operating Parameters TA = -40 C to 85 C, VDD = 15V (unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Supply Voltage Supply Current VDD IDD Operating Operating Voltage Reference, Undervoltage, Oscillator Output Voltage Output Current Undervoltage Oscillator Frequency Frequency Drift VREF IREF VUV fOSC dfOSC Operating Operating, ROSC=10k, COSC=5k Operating 22 8 25 TBD 28 8 12 15 10 V mA V kHz 8 24 20 44 35
o o
Units V mA
Logic Inputs Sensor (Pins 3,4,5), Fwd/Rev (pin 6), /Brake and 60/120 Select (Pins 9,11) Inputs High State Low State High State Input Current Low State Input Current VIH VIL IIH IIL Disable Input (Pin 7) High State Low State High State Input Current Low State Input Current VIH VIL IIH IIL Debouncing Debounce Time (60/120 Select, tdela y1 Fwd/Rev)1) Debounce Time (/Brake)1) Delay after Start-up2) tdela y2 tdela y3 Charge Pumps Output Current IOCP Drivers Top Output On-Resistance Bottom Output On-Resistance Rise Time RON,T RON,B tr ILOAD = 50mA ILOAD = 50mA 50 50 150 ns 100 A 18 2 18.6 25 3.2 25.6 35 4.4 35.6 ms ms ms 4.2 3.5 1.0 1.0 V V mA mA 3.5 1.5 1.0 2.0 V V mA mA
3901090401 Rev. 002
Page 3 of 12
Data Sheet Aug/02
MLX90401
Brushless DC Motor Controller
Fall Time Turn-on Propagation Delay Turn-off Propagation Delay tf td,on td,off Top Drivers Leakage Current Voltage Drop IOFF VOL VOUT = 60V IOUT = 50mA Bottom Drivers Voltage Drop High State Voltage Drop Low State VOH VOL IOUT = 100mA IOUT = 100mA 1.3 1.3 1.6 1.6 V V 1.3 -10 1.6 A V 150 300 300 ns ns ns
Note:
1) tdelay1 and tdelay2 depend on fosc and timing of the signals to be debounced. 60/120 Select and Fwd/Rev are debounced using a clock with a frequency of 256*fosc . /Brake is debounced using a clock with a frequency of 32*f osc. Debouncing takes between 2 and 3 clock cycles. Typical example for, say 60/120 Select: 2.5*256*1/f osc = 2.5*256*1/25kHz = 25.6 ms. 2) tdelay3 depends on fosc. Precautions are taken that tdelay3 is always larger than tdelay1, so that there are only output signals when the chip is in the correct state.
3901090401 Rev. 002
Page 4 of 12
Data Sheet Aug/02
MLX90401
Brushless DC Motor Controller 4. Block Diagram
5V Regulator (To Logic) V+ (1) UVLO VREG(internal)
12V Regulator (To Boost)
VREF (2) UVLO Sawtooth Oscillator OSC 25kHz (variable) Charge Pump Note: only one channel shown
Osc R/C (8)
Cap Boost (18,21,24)
V+
Level Shifter
GT (17,20,23)
Speed Adj / Disable (7) VREG(internal)
+ UVLO
Chop
FB (16,19,22)
+
Fault
Output Control Logic
GB (13,14,15)
PWR GND (12) 5V 3.5K /Brake (9) Debouncer Commutation Decoding Logic 3.5K Hall A (3) 5V 3.5K Hall B (4) 5V 3.5K Hall C (5) 5V
5V 60/120 Select (11) 3.5K Debouncer 5V 3.5K Fwd/Rev (6) Debouncer
VSS (10)
3901090401 Rev. 002
Page 5 of 12
Data Sheet Aug/02
MLX90401
Brushless DC Motor Controller 5. Pin function description
Pin 1 2 3-5 6 Symbol Supply voltage V+ VREF Out Hall "A", "B" and "C" Inputs Fwd/Rev Input Description External power supply voltage. Regulated reference voltage (12V) derived from V+. Used to power external components and Hall-effect sensors, and for boost voltage. Hall IC open collect inputs. Pull-up resistance of 3.3k to 5V. The Forward/Reverse Input is used to change the direction of motor rotation. A logic high state selects forward direction, a logic low state selects reverse direction. Pull-up resistance of 3.3k to 5V. Potentiometer input - adjusts the PWM duty cycle setting current, allowing a manual speed adjustment. Disable input can be used in combination with any type of switch (thermal, Hall, ...). A logic low on this pin selects the disable function. The Oscillator frequency is set with the values selected for the timing components RRC and CRC. A logic high state at this input allows the motor to run, while a low state causes rapid deceleration. Pull-up resistance of 3.3k to 5V. Ground pin for analog blocks. A logic high state on this pin selects 60 sensor electrical phasing, a logic low state selects 120. Pull-up resistance of 3.3k to 5V. Ground pin for digital and output drivers. Three push-pull drivers for direct drive of bottom power switch transistors. This pin is negative supply of the top drive circuitry. It is the connection for the negative side of the bootstrap capacitor, the top power FET Source, the bottom power FET Drain, and the Phase C output. Three push-pull drivers for direct drive of top power switch transistors. This pin is the positive supply of the top drive circuitry. The boost capacitor is connected between this pin and Feedback.
7
Speed Adjust Input/Disable
8 9 10 11 12 13-15 16, 19, 22
Oscillator RC /Brake Input Analog ground 60/120 Select Input Power Ground Gate Bottom "A", "B" and "C" Feedback "A", "B" and "C"
17, 20, 23 18, 22, 24
Gate Top "A", "B" and "C" Cap Boost "A", "B" and "C"
3901090401 Rev. 002
Page 6 of 12
Data Sheet Aug/02
MLX90401
Brushless DC Motor Controller
60/120 Select and Fwd/Rev to settle and output the correct signal. (/Brake is debounced with a shorter time so settles a lot sooner.)
6. General Description
The MLX90401 contains all of the functions for controlling three-phase brushless DC motors in open loop applications. The MLX90401 provides commutation from Halleffect sensors. The chip contains a rotor position decoder for proper commutation sequencing, a voltage reference that supplies power for the sensors, a pulse width modulator based on a frequency programmable sawtooth oscillator and three top and three bottom drivers. Using a bootstrap/charge pump combination, the MLX90401 also generates a boost voltage to drive the top power FET. In this way the application only uses N-channel power FETS, to reduce overall system cost. The MLX90401 supports following control functions: speed control, forward or reverse rotation, braking and disable. Also an undervoltage lockout is provided. The MLX90401 can be configured for motors with 60 or 120 sensor electrical phasings, using a select pin.
6.2. Oscillator
The frequency of the internal ramp oscillator is set by the values selected for timing components RT and CT. Capacitor CT is charged from the Reference Output (Pin 2) through Resistor R and discharged by an internal discharge transistor. The ratio of the ramp peak and valley voltages, referred to the Reference Output voltage are typically 0.65 and 0.3V respectively. To provide a good compromise between audible noise and output switching efficiency, an oscillator frequency in the range of 20 to 30 kHz is recommended.
T
6.3. Disable
Pin 7, Speed Adjust Input/Disable, is to be connected to an external potentiometer, used to set motor speed. The input can also be used as a Disable input, turning off all output drivers. This Disable input can be used in many ways. A thermal switch could be used to provide thermal protection. Or a Hall switch could be used to provide protection against overcurrent, etc. Disable has a higher priority than /Brake. If for instance Disable is active, braking will not have any effect. If /Brake is active at the moment that Disable is made active, all braking will be stopped.
6.1. Commutation decoding and output control logic
An internal digital circuit converts the signals from the Hall-effect position sensors into the proper sequencing of top and bottom drive outputs. 60 or 120 sensor electrical phasing can be selected by an external pin (60/120 Select, pin 11). The Forward/Reverse input (pin 6) is used to change the direction of motor rotation. If the /Brake input (pin 9) is pulled low, bottom drivers are turned on, while top drivers are turned off, thus braking the motor. These six inputs all have internal pull-up resistors (3.3k to 5V). Inputs 60/120 Select, Fwd/Rev and /Brake are debounced to make sure that the device doesn't enter the wrong state, due to noise and/or spikes. The fact that these signals are debounced, also means that there is a delay in these signals. Whenever one of the external signals that are debounced is changed, it takes time till the outputs change accordingly (ca. 25ms for the 60/120 Select and Fwd/Rev inputs, ca. 3ms for /Brake). After start-up, the outputs are disabled for a given time, in order to provide for the time necessary for the debouncing circuits on 3901090401 Rev. 002
6.4. Pulse width modulation
The use of pulse width modulation provides an energy efficient method of controlling the motor speed by varying the average voltage applied to each stator winding during the commutation sequence. As CT discharges, the oscillator allows conduction of the top and bottom drive outputs. The PWM comparator terminates the bottom drive output conduction when the positive-going ramp of CT becomes greater than the Speed Adjust Input. In order to minimize dissipation in the internal diodes of the external top switch transistors, due to free-wheeling currents, the PWM acts also on the top FET, by turning it on when the corresponding bottom FET is off. The pulse width modulator timing diagram is shown below. (Braking the motor does not depend on the PWM setting. It is always done at 100%.)
Page 7 of 12
Data Sheet Aug/02
MLX90401
Brushless DC Motor Controller
PWM Timing Diagram
RC Input
6.5. Drive outputs
The bottom drivers consist of a push-pull driver between the 12V reference voltage and ground. The top drivers use an improved push-pull architecture to guarantee proper drive of the top FETs. Because the top driver utilizes a bootstrap/charge pump combination, use of only N-channel power FETs for the three-phase bridge is possible. This leads to a reduced system cost. Internal charge pumps precharge the boost capacitors ensuring full drive of upper power FETs at start-up. During normal operation, boost is maintained with an external diode and capacitor. The charge pumps compensate for potential leakage currents, in order to ensure that the upper power FETs are driven properly at all time.
VSpeed Input
Osc
Top Drive Output
Bottom Drive Output
6.6. Undervoltage lockout
Note
Top and Bottom Drive Output Diagrams assume commutation logic gives 1 for bottom switch and 0 for top switch. In case the commutation logic gives 0 for bottom Switch and 1 for top switch, the PWM does not act on them.
Should the voltage level on VDD drop below 7V, all gate drives will be turned off until the undervoltage condition is gone. This to prevent improper drive of the power FETs.
3901090401 Rev. 002
Page 8 of 12
Data Sheet Aug/02
MLX90401
Brushless DC Motor Controller 7. Logic table
Following logic table shows the output state in function of the inputs. It summarizes the different functions of the MLX90401
Motor position
Inputs Sensor Electrical Phasing 60 SA SB 0 0 1 1 1 0 0 0 1 1 1 0 x SC 0 0 0 1 1 1 0 1 1 1 0 0 x SA 1 1 1 0 0 0 1 0 0 0 1 1 x 120 SB 0 0 1 1 1 0 0 0 1 1 1 0 x SC 1 0 0 0 1 1 1 1 1 0 0 0 x 1 1 1 1 1 1 0 0 0 0 0 0 x 1 1 1 1 1 1 1 1 1 1 1 1 0 TA 1 1 0 0 0 0 0 0 1 1 0 0 0 TB 0 0 1 1 0 0 1 1 0 0 0 0 0 TC 0 0 0 0 1 1 0 0 0 0 1 1 0 BA 0 0 0 1 1 0 1 0 0 0 0 1 1 Fwd/ /Brake Rev Top Drive
Outputs Bottom Drive Motor phases
BB 1 0 0 0 0 1 0 0 0 1 1 0 1
BC 0 1 1 0 0 0 0 1 1 0 0 0 1
PA ^ ^ v v v ^ ^ v v
PB v ^ ^ v ^ ^ v v v
PC v v ^ ^ v v ^ ^ v
0 60 120 180 240 300 0 300 240 180 120 60
0 1 1 1 0 0 0 0 0 1 1 1 x
8. Absolute Maximum Ratings
Supply Voltage, VDD (operating) Output Voltage on Pins Gate & Boost Voltage on Pins 17,18,20,21,23,24 Power Dissipation, PD Operating Temperature Range, TA Storage Temperature Range, TS -0.3 to 45V 60V -0.3 to 60V 500mW -40 to 85C -40 to 125C
3901090401 Rev. 002
Page 9 of 12
Data Sheet Aug/02
MLX90401
Brushless DC Motor Controller 9. Typical Application
V+
C1 1000F
C2 100nF
R1 500R
DZ1 15V
C3 1000F
C4 100nF
IC1 MLX90401 VREF 1 Supply Voltage Cap Boost "A" 24 D3 2 VREF Out Gate Top "A" 23 R8 3 Hall "A" Input Feedback "A" 22 VREF 4 Hall "B" Input Cap Boost "B" 21 D2 5 Hall "C" Input Gate Top "B" 20 R7 C9 100nF VREF 7 Speed Adjust Input / Disable Oscillator R/C Cap Boost "C" 18 D1 Gate Top "C" 17 R6 9 /Brake Input Feedback "C" 16 C8 100nF Q4 D5 Q5 D6 M1 Brushless DC Motor C10 100nF Q6
C5 22F
C6 100nF
Speed R2 1k ROSC 10k P1 1k C7 100nF
6
Fwd/Rev Input
Feedback "B"
19
8
Disable
10
Analog Ground 60/120 Select Input Power Ground
Gate Bottom "A"
15 R5 Q3 14 R4 Q2 R3 Q1 ... Q6 = IRF530 D1 ... D3 = 1N4148 D4...D6 = 1N4007 D4
C OSC 5nF
Forward/Reverse
11
Gate Bottom "B"
Brake
12
Gate Bottom "C"
13
60/120 Select
Q1 R3 ... R8 = 22R
10.
Application Comments
10.1. Demo board
A Demo board was designed to facilitate the evaluation of the MLX90401 and the design of new applications. A description of the Demo board can be found on the Melexis website at www.melexis.com. The Demo board can be ordered online.
11.
Reliability Information
Melexis devices are classified and qualified regarding suitability for infrared, vapor phase and wave soldering with usual (63/37 SnPb-) solder (melting point at 183degC). The following test methods are applied: IPC/JEDEC J-STD-020A (issue April 1999) Moisture/Reflow Sensitivity Classification For Nonhermetic Solid State Surface Mount Devices CECC00802 (issue 1994) Standard Method For The Specification of Surface Mounting Components (SMDs) of Assessed Quality MIL 883 Method 2003 / JEDEC-STD-22 Test Method B102 Solderability For all soldering technologies deviating from above mentioned standard conditions (regarding peak temperature, temperature gradient, temperature profile etc) additional classification and qualification tests have to be agreed upon with Melexis.
3901090401 Rev. 002
Page 10 of 12
Data Sheet Aug/02
MLX90401
Brushless DC Motor Controller
The application of Wave Soldering for SMD's is allowed only after consulting Melexis regarding assurance of adhesive strength between device and board. For more information on manufacturability/solderability see quality page at our website: http://www.melexis.com/
12.
ESD Precautions
Electronic semiconductor products are sensitive to Electro Static Discharge (ESD). Always observe Electro Static Discharge control procedures whenever handling semiconductor products.
13.
Package Information
DF - 24 Lead Wide Body SOIC 0.32 0.23 7.60 10.65 7.40 10.00
1.27 0.40
0.51 0.33 15.60 15.20
1.27
0o to 8o 2.65 2.35
0.010 min. All dimensions in millimeters
3901090401 Rev. 002
Page 11 of 12
Data Sheet Aug/02
MLX90401
Brushless DC Motor Controller
14.
Disclaimer
Devices sold by Melexis are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. Melexis makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. Melexis reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with Melexis for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by Melexis for each application. The information furnished by Melexis is believed to be correct and accurate. However, Melexis shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interrupt of business or indirect, special incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of Melexis' rendering of technical or other services. (c) 2002 Melexis NV. All rights reserved.
For the latest version of this document, go to our website at:
www.melexis.com
Or for additional information contact Melexis Direct:
Europe and Japan:
Phone: +32 13 67 04 95 E-mail: sales_europe@melexis.com
All other locations:
Phone: +1 603 223 2362 E-mail: sales_usa@melexis.com
QS9000, VDA6.1 and ISO14001 Certified 3901090401 Rev. 002 Page 12 of 12 Data Sheet Aug/02

▲Up To Search▲

Price & Availability of MLX90401

	To Download MLX90401 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .