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LM3647 Folha de dados(PDF) 5 Page - Texas Instruments

Nome de Peças LM3647
Descrição Electrónicos  Universal Battery Charger
Download  19 Pages
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
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LM3647 Folha de dados(HTML) 5 Page - Texas Instruments

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OBSOLETE
LM3647
www.ti.com
SNOS517H – MARCH 2000 – REVISED APRIL 2013
FUNCTIONAL DESCRIPTION
GENERAL
The LM3647 can be configured to charge three different types of batteries: Ni-Cd, Ni-MH and Li-Ion. The charger
behavior for Ni-Cd and Ni-MH is similar but the charge curves will appear slightly different due to the differences
in chemistry. The Ni-Cd/Ni-MH charging algorithm is divided into four phases:
Soft Start: The LM3647 detects that a battery is connected and optionally verifies that the temperature is within
safe operating limits (approx.
−5°C to +50°C). Charging starts with a current of 0.2C and switches into the
next phase after approx. 5 minutes. Error termination will be triggered by Maximum Battery Voltage (CEL-
pin > 3.017V) or if the battery voltage does not reach the defective battery level (CEL-pin < 1.2V).
Fast Charge: Constant current is applied to the battery and the LM3647 monitors voltage and temperature
(optional). Switching into the next phase will appear after a voltage drop in the charging curve: Ni-Cd
∼ 50
mV/cell and Ni-MH
∼ 17 mV/cell. Error termination will be triggered by over-temperature.
Topping Charge: A current of 0.2C is applied to the battery for a user defined time (RC network at SEL4).
Maintenance Charge: Is user selectable and is a fixed percentage of the Fast Charge rate. Discharge before
charge is user selectable.
Figure 2. Ni-Cd Charging Curve
Figure 3. Ni-MH Charging Curve
The Li-Ion charging algorithm is also divided into four phases:
Qualification: The LM3647 detects that a battery is connected and verifies that the temperature (optional but
highly recommended for safety reasons) is within limit. Charging starts with a current of 0.2C and switches
into next phase after approx. 1 minute. Error termination will be triggered if the battery voltage does not
reach the Li-Ion battery qualification level (CEL-pin < 1.2V) within one minute.
Fast Charge Constant Current: Battery voltage will rise until Maximum Battery Voltage (CEL-pin = 2.675V
or 2.74V depending on SEL3) is reached.
Fast Charge Constant Voltage: Keeps the voltage constant until the current has decreased below the
threshold (CS at 2.3V).
Maintenance Charge: Is user selectable and is a fixed percentage of the Fast Charge rate.
Figure 4. Li-Ion Charging Curve
Copyright © 2000–2013, Texas Instruments Incorporated
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