PMP9795

Automotive USB Charging Port Supply Reference Design With Programmable Cable Compensation

PMP9795

Design files

Overview

This reference design includes a power management circuit  capable of controlling a remote USB charging port in an automotive application environment. The circuit can be supplied directly from the car battery rail. It uses a small and highly efficient step-down converter, the TPS62130A-Q1, to regulate the required USB bus voltage for charging with charge currents up to 2.5A.

The USB charging port is controlled and protected by using a USB charging controller, the TPS2549-Q1, which is also used to monitor the charge current for adjusting the output voltage of the TPS62130A-Q1. This enables the voltage drop across the cable connection to the USB port to be compensated. In addition, the TPS2549-Q1 generates all required signals to indicate a USB charging port to the equipment connected to the port.

The required compensation for  the voltage drop across the cable connection to USB varies with the cable length.  This reference design presets the cable compensation for different cable lengths. It uses a rail-to-rail operational amplifier, OPA348,  to adjust the current sinked  from the TPS2549-Q1 into the TPS62130-Q1 and set the output voltage of the TPS62130A-Q1 accordingly.

Features
  • Complete power solution for a remote USB charging port
  • Input overvoltage protection for surge voltages up to 40V
  • Supports charge currents up to 2.5A
  • Up to 92% efficiency at full output power
  • Digitally programmable cable voltage drop compensation for 2% accurate load regulation
Output voltage options PMP9795.1
Vin (Min) (V) 5
Vin (Max) (V) 40
Vout (Nom) (V) 5
Iout (Max) (A) 2.5
Output Power (W) 12.5
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Buck- Synchronous

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUCG1.PDF (445 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

TIDRO16.PDF (370 K)

Detailed schematic diagram for design layout and components

TIDRO17.PDF (45 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRO18.PDF (229 K)

Detailed overview of design layout for component placement

TIDRO20.ZIP (533 K)

Files used for 3D models or 2D drawings of IC components

TIDCCR2.ZIP (457 K)

Design file that contains information on physical board layer of design PCB

TIDRO19.PDF (118 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Buck converters (integrated switch)

TPS621303-17V 3A Step-Down Converter with DCS-Control in 3x3 QFN Package

Data sheet document-pdfAcrobat PDF open-in-new HTML
General-purpose op amps

OPA348Single, 5.5-V, 1-MHz, low quiescent current (45-μA), RRIO operational amplifier

Data sheet document-pdfAcrobat PDF
USB power switches & charging port controllers

TPS2549-Q1Automotive USB Charge port controller with droop compensation

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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* Test report PMP9795 Test Results Oct. 20, 2016

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