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UCC3958DPTR-1 Datasheet(PDF) 6 Page - Texas Instruments |
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UCC3958DPTR-1 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 8 page 6 UCC3958 -1/-2/-3/-4 Figure 6. SIngle Cell Lithium-Ion Battery Protector IC Application Diagram UDG-97152 Controlled Charge/Discharge Mode When the chip senses an over-voltage condition, it pre- vents any additional charging, but allows discharge. This is accomplished by activating a linear control loop which controls the gate of the MOSFET based on the differen- tial voltage across its drain to source terminals. The lin- ear loop attempts to regulate the differential voltage across the MOSFET to 100mV. When a light load is ap- plied to the part, the loop adjusts the impedance of the MOSFET to maintain 100mV across it. As the load in- creases, the impedance of the MOSFET is decreased to maintain the 100mV control. At heavy loads (still below “over-current” limit level), the loop will not maintain regu- lation and will drive the gate of the MOSFET to the bat- tery voltage (not the charge-pump output voltage). The MOSFET RDSON in the over-voltage state will be slightly higher than RDSON during normal operation. The voltage drop (and associated power loss) across the internal MOSFET in this mode of operation is lower than the typi- cal solution of two external back-to-back MOSFETs, where the body diode is conducting. 0 100 200 300 400 500 600 700 2.00 2.10 2.20 2.30 2.40 CELL VOLTAGE (V) 0.2Amp 1.0Amp 2.0Amp Figure 5. Typical MOSFET Voltate Drop During Charge in UV vs. Cell Voltage. APPLICATION INFORMATION (continued) |
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