Posted by Circuits Arena on Saturday, 27 December 2014
USB Car Charger Circuit Diagram is the artlcle explaining USB Car Charger Circuit Diagram: Fig. Usb Car Charger Cicuit This circuit is an improved version of the usb power socket circuit ...
USB Car Charger Circuit Diagram:
Fig. Usb Car Charger Cicuit
- This circuit is an improved version of the usb power socket circuit and usb car charger was designed with the aim of providing an onboard usb power outlet for charging/running portable usb devices.
- The aim of the present design and based on a step-down switching regulator
chip, is to create a usb power outlet that has more efficiency which can
cope with higher current requirements, so that it also becomes suitable
for more powerful standard usb devices and non-standard usb
decorations.
- The DC voltage delivered by the car battery is routed to the input
socket (J1) of the circuit through the indash cigar lighter power
socket.
- The switching regulator circuit is built around the
LM2596,and is mostly based on the design given in the device’s
datasheet. The LM2596 series of regulators are precision monolithic
integrated circuits that provide all the active functions for a
step-down switching regulator, capable of driving a 3A load with
excellent line and load regulation.
- These regulators operates at a switching frequency of 150 kHz thus
allowing smaller sized filter components than what would be needed with
lower frequency switching regulators.
- The 5V fixed output version LM2596T-5.0 (IC1) is used as the switching
regulator. Note that the output available is highly dependent on the
quality of inductor (L1) and output capacitor (C3). For the inductor,
the dc current and resistance ratings are critical in addition to its
inductance.
- The green LED (LED2) is the power output indicator. Stable 5V dc output
from IC1 is branched into two usb outputs, named decoration port
and DCP. DP port can be used to run
non-standard usb gizmos like usb reading lamp, heater, fridge.
- The DCP is reserved only for charging standard usb devices including
smart phones and tablets. The jumpers JP1 and JP2 are reserved for
circuit enhancements. By default, pins 2&3 of JP1 and JP2 are
bridged independently for standard operation.
Parts List:
- IC1: LM2596T
- D1: 1N5408
- D2: 1N5824
- LED1: 5mm Red
- LED2: 5mm Green
- L1: 33uH/3Amp
- C1: 100nF
- C2: 470uF/25V
- C3: 220uF/25V
- R1: 1K ¼ w
- R2: 470R ¼ w
- S1: SPST on/off switch
- J1: DC socket
- J2-J3: USB sockets
- F1: 4Amp Fuse
