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 390118110003 Author: FJE Page 1 of 15 Rev 1.0 / 04/09/08 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. 390118110003 Author: FJE Page 2 of 15 Rev 1.0 / 04/09/08 Application Note MLX81100 Example schematics 2.3 Schematic 390118110003 Author: FJE Page 3 of 15 Rev 1.0 / 04/09/08 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. 390118110003 Author: FJE Page 4 of 15 Rev 1.0 / 04/09/08 Application Note MLX81100 Example schematics 3.3 Schematic 390118110003 Author: FJE Page 5 of 15 Rev 1.0 / 04/09/08 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. 390118110003 Author: FJE Page 6 of 15 Rev 1.0 / 04/09/08 Application Note MLX81100 Example schematics 4.3 Schematic 390118110003 Author: FJE Page 7 of 15 Rev 1.0 / 04/09/08 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. 390118110003 Author: FJE Page 8 of 15 Rev 1.0 / 04/09/08 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 390118110003 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 Page 9 of 15 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. 390118110003 Author: FJE Page 10 of 15 Rev 1.0 / 04/09/08 Application Note MLX81100 Example schematics 6.3 Schematic 390118110003 Author: FJE Page 11 of 15 Rev 1.0 / 04/09/08 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 390118110003 Author: FJE Page 12 of 15 Rev 1.0 / 04/09/08 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 390118110003 Author: FJE LIN 180p GND GND Page 13 of 15 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 Page 14 of 15 Rev 1.0 / 04/09/08 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 390118110003 Author: FJE Page 15 of 15 Rev 1.0 / 04/09/08