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TC3827-4.1VUA Arkusz danych(PDF) 4 Page - Microchip Technology |
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TC3827-4.1VUA Arkusz danych(HTML) 4 Page - Microchip Technology |
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4 / 10 page  4 Lithium-Ion Battery Charger TC3827 TC3827-2 12/12/00 © 2001 Microchip Technology Inc. DS21558A APPLICATIONS INFORMATION A typical Li-Ion cell should be charged at a controlled current until it reaches 4.1V or 4.2V (depending on the type of cell), then charged at this voltage. The TC3827 is de- signed to offer the maximum integration and function with a small application circuit. The only necessary external com- ponents are a PMOS , two small capacitors, and an RSENSE. The charge current profile can be monitored using the voltage signal at IMON. The use of an LED as a status indicator is optional. The application circuit is shown in Figure 1. SELECTING EXTERNAL COMPONENTS Power Supply Input In most applications, this will be a small “wall cube” switching converter with an output voltage limit range of 5V to 6V. P-Channel Pass Device The PMOS is used to regulate current from the source into the Li-Ion cell. Specifications to consider when choosing an appropriate PMOS are the minimum drain-source break- down voltage, the minimum turn-on threshold voltage (VGSTH), drain current and power-dissipation capabilities. Bypass Capacitors Bypass VIN with a capacitor value of at least 10µF. Bypass VOUT with a capacitor value of at least 1µF. CHARGER MODES DESCRIPTION Initiating a Charge Cycle The TC3827 initiates a charge upon toggling the shut- down pin high, insertion of the battery or application of an external power source. The TC3827 provides a foldback current limited charge where an external current sense resistor sets IMAX. The voltage drop across the current sense resistor is applied to the VIN -VSNS pins and presented to the current limited control-loop.The current loop will protect a deeply discharged (or shorted) battery by folding back the current limited charge, and reduces the power dissipation in PMOS. Current Limited, Constant-voltage Charge Cycle The TC3827 begins to charge the Li-Ion cell by turning on the external PMOS. The charge continues until the battery voltage rises to the lithium-ion cell voltage of 4.2V or 4.1V (depending on type of cell). As the battery voltage reaches the regulated output voltage, the internal feedback Figure 3. TC3827 Test Circuit V REG V OUT I REG I MAX I FOLDBACK Constant Voltage Mode Foldback Current Limited Mode I SC I OUT Figure 2. TC3827 Charging Characteristic R SENSE =500m Ω S G D NDP6020P PMOS V SNS V DRV GND V IN V IN V OUT V OUT SHDN IMON MODE 10 µF TC3827 22 µF |
Podobny numer części - TC3827-4.1VUA |
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Podobny opis - TC3827-4.1VUA |
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