Freescale Semiconductor, Inc. Application Note Document Number: AN5000 Rev. 1.0, 11/2014 EMC and Transient Performance For the Dual SOIC 24 V High-side Switch Family (MC24XS4) 1 Introduction This application note describes the EMC and fast transient pulse capability of the MC22XS4200 and MC50XS4200 devices. These intelligent high-side switches are designed to be used in 24 V systems such as trucks, busses, and special engines. They can be used in some industrial and 12 V applications as well. The low RDS(on) channels can control incandescent lamps, LEDs, solenoids, or DC motors. Control, device configuration, and diagnostics are performed through a 16-bit SPI interface, allowing easy integration into existing applications. For a complete feature description, refer to the individual data sheets. © Freescale Semiconductor, Inc., 2014. All rights reserved. Contents 1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2 EMC Board Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 3 Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 4 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5 Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 EMC Board Setup 2 EMC Board Setup The KIT22XS4200EKEVB and KIT50XS4200EKEVB are composed of four layers. They are used for testing with the following resistor and capacitor values (X7R 100 V): • On VPWR: 100 nF and 1.0 uF are placed close to the 22XS4200 and 50XS4200 devices • For each output: 22 nF is located at the output connector • Low pass filter on the CSNS output pin: 10 + 22 nF Figure 1. 24 V High-side Switch Evaluation Board AN5000 EMC and Transient Performance Rev. 1.0 2 Freescale Semiconductor, Inc. EMC Board Setup Figure 2. Application Schematic AN5000 EMC and Transient Performance Rev. 1.0 Freescale Semiconductor, Inc. 3 Measurements 3 Measurements 3.1 Conducted Emission Measurements Conducted emission is the emission produced by the device on the battery cable. The bench test is described by the CISPR25 standard. The Line Impedance Stabilization Network (LISN), also called the Artificial Network (AN), in a given frequency range (150 kHz to 108 MHz), provides a specified load impedance for the measurement of disturbance voltages, and isolates the equipment under test (EUT) from the supply in that frequency range. The EUT must operate under typical loading and other conditions, just as it is in the vehicle, so that a maximum emission state occurs. These operating conditions are clearly defined in the test plan to ensure that both supplier and customer are performing identical tests. For the testing described, the device was in 24 V, 160 mA Sleep and Normal modes, and each output pins of the 22XS4200 and 50XS4200, was connected to 24 V lamp(s) or 24 V 160 mA LEDs. One 2.2 nF COG was added on VPWR for better performance.The ground return of the lamps was connected to the chassis and the ground path of the EUT flowed into the LISN. The power supply voltage is 24 V (double car battery). The SPI watchdog feature was disabled for this test. The results of those measurements are represented in Table 2: Table 1. Conducted Emission Results 22XS4200 CISPR25 2008 Level (peak) Conducted Emissions All outputs OFF Outputs PWMing with 0 phase shift at 400 Hz with 50% of duty cycle Loads per Output Mode 21 W Lamp + 5.0 W Lamp Sleep High Band > 1.0 MHz Class5 Class5 Medium Class5 Class5 21 W Lamp + 5.0 W Lamp Fast Class4 Class5 Medium Class5 Class5 Fast Class5 Class5 Medium Class4 Class5 Fast Class4 Class5 21 W Lamp + 5.0 W Lamp Normal AN5000 EMC and Transient Performance Rev. 1.0 4 Low Band < 1.0 MHz 21 W Lamp + 5.0 W Lamp 160 mA LED Outputs PWMing with 180 ° phasing at 400 Hz with 50% of duty cycle Slew Rate Freescale Semiconductor, Inc. Measurements Figure 3. 22XS4200 Normal Mode - Both Outputs in Phase PWMing at 400 Hz with 50% of Duty Cycle Table 2. Conducted Emission Results 50XS4200 CISPR25 2008 Level (average) Conducted Emissions All outputs OFF Loads per Output Mode 2 x 5.0 W Lamp Sleep Slew Rate 2 x 25 W Lamp Outputs PWMing in same time at 400 Hz with 50% of duty cycle Normal 160 mA LED Outputs PWMing with 180 ° phasing at 400 Hz with 50% of duty cycle 2 x 5.0 W Lamp Normal Class5 Medium Class5 Fast Class5 Medium Class5 Fast Class5 Medium Class5 Fast Class5 AN5000 EMC and Transient Performance Rev. 1.0 Freescale Semiconductor, Inc. 5 Measurements Figure 4. 50XS4200 Normal Mode - Both Outputs in Phase PWMing at 400 Hz with 50% of Duty Cycle 3.2 Conducted Immunity Measurements Conducted immunity is the device susceptibility for RF injection applied directly on a device terminal. The bench test is described by the 62132-4 specification (Direct Power Injection) from the International Electrotechnical Commission. Table 3 describes the performance grades have been used to characterize the device performance: Table 3. Performance Grades Description Class A All functions of the IC perform as designed during and after exposure to a disturbance. Class B All functions of the IC perform as designed during exposure, however, one or more of them may go beyond the specified tolerance. All functions return automatically to within normal limits after exposure is removed. Memory functions shall remain in class A. Class C A function of the IC doesn’t perform as designed during exposure but returns automatically to normal operation after exposure is removed. Class D A function of the IC doesn’t perform as designed during exposure, and doesn’t return to normal operation until exposure is removed and the IC is reset by simple operator action (e.g. put off supply...). Class E One or more functions of an integrated circuit do not perform as designed during and after exposure and cannot be returned to proper operation. For the testing described, the device was in Sleep, and Normal modes, and each output terminal of the 50XS4200 was connected to 5.0 W lamp(s). The ground return of the bulb was connected to the chassis, and the ground path of the EUT flowed into the LISN. The power supply voltage is 24 V (double car battery). The results of these measurements are represented in Table 4. Output states, analog current sensing, and digital fault reporting are in accordance with the grade description and power injection from 1.0 MHz to 1.0 GHz on the VPWR pin. AN5000 EMC and Transient Performance Rev. 1.0 6 Freescale Semiconductor, Inc. Measurements Table 4. 50XS4200 Conducted Immunity Results Feature Load Mode All outputs OFF 2 x 5.0 W lamps Sleep 31 dBm 35 dBm A All outputs ON 2 x 5.0 W lamps Normal 31 dBm 37 dBm A Outputs PWMing in same time at 400 Hz with 50% of duty cycle 2 x 5.0 W lamps Normal 29 dBm 33 dBm A 3.3 Power Injection (CW) Power Injection (AM) Class Fast Transient Pulse Measurements Transient pulse immunity is the device susceptibility for fast transient pulse applied directly on the VPWR and HS pins. The transient pulses are described by the ISO7637-2 standard from the International Electrotechnical Commission. The power supply voltage is 28 V. For the testing on VPWR, the device was in Sleep state or Fail-safe mode and the output pins of the 50XS4200 were connected to a resistive load. The 22XS4200 performances are covered by 50XS4200 results The results of those measurements are represented in Table 5. Table 5. 50XS4200 Fast Transient Pulse Results (disturbance on VPWR) Schaffner Pulses Applied on VPWR Sleep State All Outputs OFF Pulse 1 (RI = 50 , -600 V, 1000 occurrences, Rload = 2 ) Class C Pulse 2a (RI = 2.0 , +50 V, 1000 occurrences) Class C Pulse 3a (RI = 50 W, -200 V, 8.0 min) Class C Pulse 3b (RI = 50 W, +200 V, 8.0 min) Class C Pulse 5b (RI = 1.0 W, +87 V clamped at +58 V, 10 occurrences) Class C Pulse 4 (No load, VPWR – 16 V, 1 occurrence) Class C In the case of an open load condition or high-ohmic load (> 2 ), the transient pulses are handled by the application with a transient voltage suppressor between VPWR and GND, as presented in Decoupling Capacitors Role section. 3.4 Decoupling Capacitors Role The following table summarizes the mission of each component. Table 6. Component Role and Value VPWR Close to 06XS4200 device Reduction of emission and immunity 100 nF (X7R 100 V) 1.0 µF (X7R 100 V) VDD Close to 06XS4200 device Reduction of emission and immunity 100 nF (X7R 100 V) HSx Close to output connectors Reduction of emission and fast transient negative pulse sustaining 22 nF (X7R 100 V) CSNS Close to MCU Low pass filter to remove noise during immunity test 10 k + 22 nF (X7R 16 V) To increase device robustness against fast transient pulse robustness: VPWR Close to ECU connector to increase device robustness Sustain pulse #1 in case of high-ohmic load (or without loads) 40 V zener diode and 1N5353 diode in series per battery line AN5000 EMC and Transient Performance Rev. 1.0 Freescale Semiconductor, Inc. 7 References 4 References Following are URLs where you can obtain information on related Freescale products and application solutions: Freescale.com Support Pages Description URL MC22XS4200 Data Sheet http://cache.freescale.com/files/analog/doc/data_sheet/MC22XS4200.pdf MC50XS4200 Data Sheet http://cache.freescale.com/files/analog/doc/data_sheet/MC50XS4200.pdf KIT22XS4200EKEVB Evaluation Board User Guide http://cache.freescale.com/files/analog/doc/user_guide/KT22XS4200UG.pdf KIT50XS4200EKEVB Evaluation Board User Guide http://cache.freescale.com/files/analog/doc/user_guide/KT50XS4200UG.pdf KITUSBSPIEVME http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=KITUSBSPIEVME Interface Dongle AN5000 EMC and Transient Performance Rev. 1.0 Freescale Semiconductor, Inc. 8 Revision History 5 Revision History Revision Date Description 1.0 11/2014 • Initial release AN5000 EMC and Transient Performance Rev. 1.0 Freescale Semiconductor, Inc. 9 How to Reach Us: Information in this document is provided solely to enable system and software implementers to use Freescale Home Page: freescale.com products. There are no express or implied copyright licenses granted hereunder to design or fabricate any integrated Web Support: freescale.com/support Freescale reserves the right to make changes without further notice to any products herein. Freescale makes no circuits based on the information in this document. warranty, representation, or guarantee regarding the suitability of its products for any particular purpose, nor does Freescale assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters that may be provided in Freescale data sheets and/or specifications can and do vary in different applications, and actual performance may vary over time. All operating parameters, including “typicals,” must be validated for each customer application by customer’s technical experts. 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