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LM3647IM датащи(PDF) 5 Page - National Semiconductor (TI) |
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LM3647IM датащи(HTML) 5 Page - National Semiconductor (TI) |
5 / 17 page 5 www.national.com 4.0 Functional Description 4.1 General The LM3647 can be configured to charge three different types of batteries: Ni-Cd, Ni-MH and Li-Ion. The charger be- havior for Ni-Cd and Ni-MH is similar but the charge curves will appear slightly different due to the differences in chemis- try. The Ni-Cd/Ni-MH charging algorithm is divided into four phases: Soft Start: The LM3647 detects that a battery is connected and verifies that the temperature is within limit. Charging starts with a current of 0.2C and switch- es into next phase on timeout. Error termination will be triggered by Maximum Battery Voltage (CEL-pin > 3.017V) or if the battery voltage never reaches 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). Switch into next phase will appear as a voltage drop in the charging curve: (Ni-Cd ~ 50mV/cell) and (Ni-MH ~ 17mV/cell). Error termi- nation 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 per- centage of the Fast Charge rate. Discharge before charge is user selectable. Ni-Cd Charging Curve: Ni-MH Charging Curve: The Li-Ion charging algorithm is also divided into four phas- es: s Qualification: The LM3647 detects that a battery is con- nected 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 on timeout (~ 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. s Fast Charge Constant Current: Battery voltage will rise until Maximum Battery Voltage (CEL-pin = 2.675V or 2.74V depending on SEL3) is reached. s Fast Charge Constant Voltage: Keeps the voltage con- stant until the current has decreased below the threshold (CS at 2.3V). s Maintenance Charge: Is user selectable and is a fixed percentage of the Fast Charge rate. 4.2 Advanced Pin Descriptions SEL1 is a selection pin to set the LM3647 in different charge behavior. The pin has three states: tied to Vcc, GND, or un- connected (Hi-Z). When the charger is configured to charge Ni-Cd or Ni-MH batteries, this pin determines if the charger discharges the battery before charging or if the charger shall only maintenance charge the battery. When the charger is configured for Li-Ion batteries, this pin determines how the charger behaves during maintenance charge. SEL2 is a selection pin to determine the battery type to be charged. The pin has three states: tied to Vcc (Ni-MH), GND (Ni-Cd), or unconnected (Li-lon). SEL3 is a selection pin used to set charger hardware modes. The pin has two states: tied to Vcc or GND. When configured for Ni-Cd/Ni-MH batteries, this pin determines whether the PWM is fast and has current feedback, or slow and has ex- ternal current control. When configured for Li-Ion batteries, this pin changes the regulation point for maximum voltage, 2.675V (4.1V Cell) or 2.74V (4.2V Cell). Note: SEL3 must be hard wired to Vcc if a charger that sup- ports both Li-Ion and Ni-Cd Ni-MH is implemented. SEL4 is connected to a RC-network that determines the charge time-outs. This RC-network is also connected to the output LED1. RCIN is a high-speed timing pin, used to drive the charger at the right frequency connected to a RC-network. GND is the ground pin. Vcc is the power-supply pin. This pin should have a 100nF capacitor tied to GND. RESET is a reset pin. LED1 is an active-low output used to indicate charge phase. It is also used when measuring the charge timeout value. Voltage Time Discharge Soft Start Fast Charge Topping Charge Maintenance Charge Voltage Time Discharge Soft Start Fast Charge Topping Charge Maintenance Charge Voltage Time Qualification Fast Charge Constant Current Fast Charge Constant Voltage Maintenance Charge Current |
Аналогичный номер детали - LM3647IM |
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Аналогичное описание - LM3647IM |
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