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LM3647 Folha de dados(PDF) 5 Page - Texas Instruments |
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LM3647 Folha de dados(HTML) 5 Page - Texas Instruments |
5 / 19 page 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 Submit Documentation Feedback 5 Product Folder Links: LM3647 |
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