TI's PMP20249 is an EMI-optimized dual-lane 12.5W USB charger reference design with LMS3635 and LMS3655 regulators and TPS2549 USB switch with CISPR 25 Class 4 design rating; input voltage from 6Vin to 18Vin at 2.5A The output voltage is 5V, which is mainly used in automotive USB charging system and car entertainment system. This paper introduces the main features and indicators of reference design PMP20249, block diagram, circuit diagram, bill of materials and PCB design.
PMP20249 is an EMI-opTImized design for dual-automoTIve USB charger system using the LMS3635 and LMS3655 regulators (400-kHz fully-integrated, synchronous buck for automoTIve applications) and theTPS2549 USB switch (TPS2549-Q1 automotive USB charging port controller with integrated power switchand The design accepts an input voltage range of 6 Vin to 18 Vin and regulates twooutputs of 5 V at 2.5 A for dual-USB ports. This highly efficient design features an inexpensive solution and small-size customized for an automotive USB charger Application. A four-layer PCB was used for thisdesign.
The design is divided into four major blocks:
• Front-end protection: Front-end protection against positive and negative pulses (ISO7630 pulse 1, 2a, 3a/b) through TVS.
• EMI filter: Differential filter for conducted EMI suppression.
• Low-EMI front-end DC-DC converters: LMS3655-Q1 and LMS3635-Q1 are switching, synchronous5.5-A and 3.5-A buck regulators, and in this design the devices are used as front-end DC-DCconverters. The device comes in an automotive-qualified HotRodTM QFN package with wettable flanks, which reduces parasitic inductance and resistance while increasing efficiency, minimizing switch node ringing, and dramatic loweringEMI. The spread spectrum feature Is a factory option which further reduces EMI. This featureeliminates peak emissions at specific frequencies by spreading emissions across a wider range of frequencies.
• Downstream USB charging-port controller and power switch: TPS2549-Q1 maintains 5 V at the USBport during heavy charging currents.
Reference design PMP20249 main features:
• Wide-Vin Front-End Power Supply for USBCharger System
• Off-Battery Operation With Positive and NegativeOvervoltage Protection
• Passed CISPR 25 Class 4 Conducted EMI Test
• Switching Frequency: Outside AM Band (400 kHz) for all Converters
• All AEC-Q100-Qualified Devices
• Supports 6-V to 18-V Wide-Vin Range
Reference Design PMP20249 Application:
• Automotive USB Charger System
• Automotive Infotainment System
Figure 1. Reference design PMP20249 outline drawing Reference design PMP20249 main indicators:
Figure 2. Reference design PMP20249 block diagram
Figure 3. Reference Design PMP20249 Circuit Diagram Reference Design PMP20249 Bill of Materials:
Figure 4. Reference Design PMP20249 PCB Design Drawing (1)
Figure 5. Reference Design PMP20249 PCB Design Drawing (2)
Figure 6. Reference Design PMP20249 PCB Design Drawing (3)
Figure 7. Reference Design PMP20249 PCB Design Drawing (4)
Figure 8. Reference Design PMP20249 PCB Design Drawing (5)
Figure 9. Reference Design PMP20249 PCB Design Drawing (6)
Figure 10. Reference Design PMP20249 PCB Design Drawing (7)
Figure 11. Reference Design PMP20249 PCB Design Drawing (8)
Figure 12. Reference Design PMP20249 PCB Design Drawing (9)
Figure 13. Reference Design PMP20249 PCB Design Drawing (10)
Steel Cord For Conveyor Belts
Steel cord conveyor belts are highly wear-resistant and used principally for long-haul conveying, heavy loads and physically demanding applications. They are especially suitable for high-mass or high-volume flows and for abrasive materials.
Steel cord Conveyor Belt Construction
The steel cord belt provides superior impact resistance, with the number and size being selected to meet the desired operating tension and application needs. The insulation gum is specifically designed to encapsulate each steel cord filament to reduce internal friction while providing enhanced adhesion to the cover rubbers. Top and bottom covers provide maximum protection to the steel cord. The cover compounds are specifically designed to meet the demands of the application and are available in a wide variety of rubber types and gauges.
Steel Cord,Steel Cord Wire,Steel Wire Cord,Conveyor Belt Steel Cord
ROYAL RANGE INTERNATIONAL TRADING CO., LTD , https://www.royalrangelgs.com