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Ditulis Oleh : YK69 Elektro
Judul : Pengisi Battery Li-On Menggunakan USB

Pengisi Battery Li-On Menggunakan USB

USB port it is one of the most useful port. Besides being used as an interface port for the device I / O computer, this port was also used as a filler Li-On Battery (Li-On Battery Charger). Battery charger circuit Li-On can you see in the image below

Skema Rangkaian Pengisi Battery Li-On

USB port capable of supplying a maximum voltage 5.25 V with a maximum flow of 0.5 A. Therefore, the above series can only be used to fill a Li-On Battery only. As LM3622 controller IC is used. IC's main function is as decisive end and a battery charging.

IC lm3622 Description

The LM3622 is a charge controller for Lithium-Ion batteries. This monolithic integrated circuit accurately controls an external pass transistor for precision Lithium-Ion battery charging. The LM3622 provides a constant voltage or constant current (CVCC) configuration that changes, as necessary, to optimally charge lithium-ion battery cells. Voltage charging versions (4.1V, 4.2V, 8.2V, and 8.4V) are available for one or two cell battery packs and for coke or graphite anode battery chemistry.

The LM3622 accepts input voltages from 4.5V to 24V. Controller accuracy over temperature is ±30mV/cell for A grade and ±50mV/cell for the standard grade. No precision external resistors are required. Furthermore, the LM3622's proprietary output voltage sensing circuit drains less than 200nA from the battery when the input source is disconnected.

The LM3622 circuitry includes functions for regulating the charge voltage with a temperature compensated bandgap reference and regulating the current with an external sense resistor. The internal bandgap insures excellent controller performance over the operating temperature and input supply range.

The LM3622 can sink 15mA minimum at the EXT pin to drive the base of an external PNP pass transistor. It also has low-voltage battery threshold circuitry that removes this drive when the cell voltage drops below a preset limit. The LV_SEL pin programs this threshold voltage to either 2.7V/cell or 2.15V/cell. The low-voltage detection, which is a user enabled feature, provides an output signal that can be used to enable a "wake up charge" source automatically to precondition a deeply discharged pack.

Features IC lm3622

Versions for charging of 1 cell (4.1V or 4.2V) or 2 cells (8.2V or 8.4V)
Versions for coke or graphite anode
Precision (±30mV/cell) end-of-charge control
Wide input range: 4.5V-24V
Low battery drain leakage: 200nA
15 mA available to drive low cost PNP

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