This version is outdated by a newer approved version.
This version (05 Oct 2020 04:02) is a draft.
Approvals: 0/1
This version (05 Oct 2020 04:02) is a draft.Approvals: 0/1
This is an old revision of the document!
Table of Contents
EVAL-CN0509-EBZ Overview
CN0509 1 is a very wide input range USB charger capable of providing up to 2A at 5V from a wide range of DC sources including solar panels, fully charged or half-discharged car batteries, -48V telecom backup supplies, random stacks of alkaline cells, treadmill motors hacked to run as generators, wind turbines, etc. using the combination of wide input LTC7103 buck converter and an isolated flyback converter LT8302. The circuit will accept any DC voltage from 5V to 100V and produce an isolated 5V supply via a standard USB connector. The outer case of many cell phones and other portable electronics are often electrically connected to USB ground. As such, isolation is necessary in situations in which the power source’s relationship to Earth ground is unknown.
The circuit will survive up to 100V reverse connection to a power source with a green LED indicating correct input polarity and red led otherwise.
Features
- Allows wide input range of 5V to 100V
- Provides isolated and regulated 5V output
- Provides up to 2A output current
- Two USB output ports for convenience
Documents Needed
- CN0509 Circuit Note
Equipment Required
- Hardware
- EVAL-CN0509-EBZ Circuit Evaluation Board
- DC Source (up to 100 V)
- Solar panels, fully charged or half-discharged car batteries, -48V telecom backup supplies, random stacks of alkaline cells, treadmill motors hacked to run as generators, wind turbines
- 2.5-ohm, 10W power resistor
- Wires/Wired out USB cable
Block Assignments
- Connector P1 is the screw terminal block for input supply
- Connector P2 is the USB output connectors for the load
USB Output Connectors
- Bottom receptacle (1) includes a USB Dedicated Charging Port (DCP) controller that enables high-current charging modes on devices from various manufacturers
- Top receptacle (2) is for general-purpose charging
Test setup
Running the System
- Ensure safe connection as it may deal with input voltages up to 100 V
- Upon turning on DC input, CN0509 will turn on. The circuit will determine if input connection is in correct polarity through lighting DS1 or DS2.
- If DS1 (green LED) turns on, this means correct polarity on the input and circuit delivers up to 10W on P2 USB output ports. Else, turn off input supply and re-connect supply outputs to P1 to correct connection.
- Connect the device/load at P2 output USB receptacle of CN0509. The lower port (closest to the PC board surface) includes the USB DCP controller while the upper port just delivers power.
- Charge your device! Take note that each device has its own “charge controller circuitry” that might limit the charging current if the voltage on the load goes below a certain level. Shown below is the maximum charging current on P2 lower port that CN0509 can provide given that the output voltage to the load is greater than 5V.
More Information and Useful Links
Schematic, PCB Layout, Bill of Materials
EVAL-CN0509-EBZ Design & Integration Files
- Schematics
- PCB Layout
- Bill of Materials
- Allegro project
- LTSpice Simulations
End of Document
resources/eval/user-guides/circuits-from-the-lab/cn0509.1601863368.txt.gz · Last modified: 05 Oct 2020 04:02 by Trisha Cabildo