Example Circuits MLX81100 DownloadLink 5463

Application Note
MLX81100
Example schematics
Table of contents
1
Introduction...................................................................................................................... 2
2
Window lifter with anti-pinch and soft start/stop function........................................... 2
3
4
5
6
7
8
2.1
Introduction...........................................................................................................................2
2.2
Tips and hints .......................................................................................................................2
2.3
Schematic.............................................................................................................................3
Switch mode power supply for high power LEDs......................................................... 4
3.1
Introduction...........................................................................................................................4
3.2
Tips and hints .......................................................................................................................4
3.3
Schematic.............................................................................................................................5
Flap control using MLX90316 for angle measurement ................................................. 6
4.1
Introduction...........................................................................................................................6
4.2
Tips and hints .......................................................................................................................6
4.3
Schematic.............................................................................................................................7
Using MLX81100 in 24V applications ............................................................................. 8
5.1
Introduction...........................................................................................................................8
5.2
Tips and hints .......................................................................................................................8
5.3
Schematic.............................................................................................................................9
Using PMOS in the high side ........................................................................................ 10
6.1
Introduction.........................................................................................................................10
6.2
Tips and hints .....................................................................................................................10
6.3
Schematic...........................................................................................................................11
Full Bridge Brushless DC Motor Driver with Hall Commutation................................ 12
7.1
Introduction.........................................................................................................................12
7.2
Tips and hints .....................................................................................................................12
7.3
Schematic...........................................................................................................................13
Disclaimer....................................................................................................................... 15
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Author: FJE
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Application Note
MLX81100
Example schematics
1 Introduction
This document is intended to give different example schematics and applications the MLX81100 could be used
for.
All following schematics are sample schematics, which need to be adjusted depending on the target application
and special requirements.
2 Window lifter with anti-pinch and soft start/stop function
2.1
Introduction
This example is intended to control a window lifter using relays. The main features are the possibility to
implement:
• An anti-pinch functionality
• A soft start/stop functionality.
2.2
Tips and hints
1. The anti-pinch function could be realised using shunt current measurement.
2. The soft start/stop function could be realised by applying PWM to the N-FET in the low side.
3. The movement supervising (speed, position, direction) as well as an anti-pinch function could be
realised using hall sensors.
4. The MLX81100 has high voltage inputs for reading in switches.
5. The Hall signals could be connected to Timer-capture inputs using general purpose IOs.
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Application Note
MLX81100
Example schematics
2.3
Schematic
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Application Note
MLX81100
Example schematics
3 Switch mode power supply for high power LEDs
3.1
Introduction
This example is intended to show the usage of MLX81100 in a switch mode power supply to drive high power
LEDs. The main features are:
• A PWM randomization in software
• A PWM frequency up to 75 kHz
• Efficiency
• The temperature supervision
• The secondary side current control via shunt measurement
• The tracking of the LED forward voltage to detect shorted LEDs
• The output power will be independent from Vbat and the temperature.
3.2
Tips and hints
1. The MLX81100 can apply the same PWM signal to more than one FET driver pin, this feature is needed
to make the transformer work with the full H-bridge.
2. The PWM randomization can be done by software.
3. The PWM modules can be programmed to a max output frequency of 100 kHz.
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Application Note
MLX81100
Example schematics
3.3
Schematic
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Application Note
MLX81100
Example schematics
4 Flap control using MLX90316 for angle measurement
4.1
Introduction
This example is intended to show the usage of MLX81100 and MLX90316 in a flap control application. The main
features are:
• The maximum Operating temperature for both ICs is up to 150 °C.
• A PWM control of the flap
• The shunt measurement is possible
• The MLX90316 allows up to 360 degrees angle measurement
• MLX90316 features different communication interfaces like Analog (Ratiometric), PWM, Serial Protocol
• Non-contacting rotary position sensor.
4.2
Tips and hints
1. The high side FETs can be driven up to true 100% PWM.
2. The PWM frequency is selectable from 100 Hz up to 100 kHz.
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Application Note
MLX81100
Example schematics
4.3
Schematic
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Application Note
MLX81100
Example schematics
5 Using MLX81100 in 24V applications
5.1
Introduction
Considering some restrictions as well as the additionally needed ICs and components it’s possible to use the
MLX81100 to drive a DC-motor connected to a 24V supply. For proper operation two separate power supplies
are needed, one for 12V and one for 24V. The MLX81100 can not be connected to the 24V supply continuously
over life time.
5.2
Tips and hints
1. The possibility of driving 100% in the high side might be limited by the additionally used high side driver
IC.
2. There are two separate power supplies needed for proper operation.
3. Observing the 24V supply could be done via ADC and external voltage divider.
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Application Note
MLX81100
Example schematics
5.3
Schematic
12V Battery
VBAT
100nF
4.7…10uF
Chassis GND
VCC
VS
VDRV
RTG
CLKO
VDD5V
100nF
HSBC2
1k
47uF
HS2
100n
V1V8
1uF
BRMID2
24V Voltage for Motor
1N4001,BAV70
etc.
100n
1N4001,BAV70
etc.
V24V
PS
VCC
PS
Hall
Sensor
US1881xUA
IO0
Hall
Sensor
US1881xUA
10k
IO5
VCC
SW0
SW1
SW3
SW4
SW5
SW6
SW7
Temperature
Sensor
tbd
IO3
IO1
IO2
IO4
LIN
Varistor
TDK AVR-M1608C270MBABB or
Back-to-Back Zener
ON-Semi MMBZ27VCLT1
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Author: FJE
LIN
180p
GND
GND
IN
HO
NC
NC
COM
VS
VB
VCC
HO
IN
10R
1k
100nF
BRMID1
680k
680k
100nF
680k
680k
LS2
SW2
GND
Shunt
10mR
SHNT_L
COM
100nF
IR 2117
HighSide Driver
IC, for up to
600V
VBAT
10k
CWD
GND
GND
NC
VS
IR2117
LS1
TO
TI1
TI0
NC
100nF
M
IR2117
1N4001
CWD
10
VB
10R
HS1
MLX81100
VCC
PS
VCC
HSBC1
10k
min 10nF
Reverse
Polarity
Protection
100R...10k
protected GND
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Chassis GND
Rev 1.0 / 04/09/08
Application Note
MLX81100
Example schematics
6 Using PMOS in the high side
6.1
Introduction
Considering some restrictions as well as the additionally needed components it’s possible to use PMOS FETs in
the high side of the h-bridge connected to MLX81100.
6.2
Tips and hints
1. The driving of PWM, even in the high-side, is possible. This feature is important regarding the thermal
power dissipation of the high-side PMOS acting as a free wheel diode when PWM is applied to the lowside FET.
2. The IC bridge driver pins are decoupled from voltage transients like load dump.
3. This schematic features passive devices that will put the h-bridge in a defined secure state during sleep
mode and in case the CPU is not working anymore.
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Application Note
MLX81100
Example schematics
6.3
Schematic
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Application Note
MLX81100
Example schematics
7 Full Bridge Brushless DC Motor Driver with Hall Commutation
7.1
Introduction
Connecting a full bridge to the MLX81100 it is possible to drive a simple bipolar BLDC motor. The commutation
is done via a hall sensor.
7.2
Tips and hints
1. The MLX81100 can apply the same PWM signal to more than one FET driver pin, this feature is needed
to make the transformer work with the full H-bridge.
2. The PWM modules can be programmed to a max output frequency of 100 kHz.
3. A PWM randomization can be done by software, e.g. for EMI or switching noise requirements.
4. The MLX81100 could help adding value to your application:
-bidirectional communication interface, e.g. LIN
-failure diagnosis features
-temperature sensing
-speed sensing
-motor current sensing
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Application Note
MLX81100
Example schematics
7.3
Schematic
VBAT
12V Battery
Chassis GND
1N4007
100nF
4.7…10uF
VCC
VS
VDRV
RTG
CLKO
VDD5V
100nF
1N4007,
BAV70
1N4007,
BAV70
HSBC2
10R
47uF
100nF
HS2
100nF
V1V8
1uF
BRMID2
VBAT
100n
PS
HSBC1
10R
HS1
VCC
Hall sensor for
commutation,
US1881
IRL3706
IRL3706
100nF
IO5
M
BRMID1
IRL3706
VCC
IRL3706
10R
SW0
SW1
SW3
SW4
SW5
SW6
SW7
Temperature
sensor
tbd
IO0
IO1
IO2
IO3
IO4
10
LIN
Varistor
TDK AVR-M1608C270MBABB or
Back-to-Back Zener
ON-Semi MMBZ27VCLT1
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Author: FJE
LIN
180p
GND
GND
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LS1
10R
LS2
SW2
GND
Shunt
VBAT
SHNT_L
10k
CWD
1N4001
CWD
TO
TI1
TI0
IRL3706
Zener 5Z6
Reverse
Polarity
Protection
GND
GND
Rev 1.0 / 04/09/08
Application Note
MLX81100
Example schematics
History record
Rev.
1.0
No.
1
390118110003
Author: FJE
Change
Creation
Date
04/09/08
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Application Note
MLX81100
Example schematics
8 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 lifesustaining 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.
© 2007 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:
All other locations:
Phone: +32 1367 0495
E-mail: [email protected]
Phone: +1 603 223 2362
E-mail: [email protected]
ISO/TS 16949 and ISO14001 Certified
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Author: FJE
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