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UCC3958DP-1 Datasheet(PDF) 5 Page - Texas Instruments |
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UCC3958DP-1 Datasheet(HTML) 5 Page - Texas Instruments |
5 / 8 page 5 UCC3958 -1/-2/-3/-4 Over Current Monitoring and Protection Discharge current is continuously monitored via an inter- nal sense resistor. In the event of excessive current, an Over Current condition is declared if the high current state persists for over 350 µs. This delay allows for charg- ing of the system bypass capacitors without tripping the overcurrent. A delay of 350 µs guarantees that the pack can charge up to 680 µF without declaring an Over Cur- rent condition. The delay may be extended to charge larger load capacitors by connecting an external delay capacitor from the CDLY pin to one of the BNEG pins. Once an Over Current condition has been declared, the internal MOSFET turns off. The only way to return the pack to normal operation is to remove the load by un- plugging the pack from the system. The overcurrent is re- set when an internal pull down brings PACK– to within less than 0.05V above BNEG. At this point, the pack re- turns to its normal state of operation. A capacitor on the CBPS pin provides momentary holdup for the UCC3958 to assure proper operation in the event that a hard short suddenly pulls the cell voltage below the minimum oper- ating voltage. This cap value can be 0.15 µF if the op- tional CDLY capacitor is not used. An internal 10k resistor buffers the bypass capacitor from the Li-Ion cell. System Status Indicators The UCC3958 provides several convenient system moni- toring signals. The first one is the Low Power Warning. This output goes high when the cell voltage is less than 300mV above the Under Voltage Threshold. It signals the system that the battery is getting close to its dis- charge limit. The second monitoring signal is a tri-statable OV/UV out- put. Under normal operations conditions, this signal is tri-stated. When an Over Voltage condition is declared, the output is pulled high. When an Under Voltage condi- tion is declared, the output is pulled low. This signal is especially useful during test, allowing easy verification of the OV and UV thresholds. These outputs are with re- spect to BNEG. 0 400 800 1200 1600 2000 4.0 5.0 6.0 7.0 8.0 9.0 10.0 CHARGER VOLTAGE (V) APPLICATION INFORMATION (continued) Figure 2. Typical OV Leakage Current with Runaway Charger at 25°C Figure 3. State Diagram UDG-98051 # # # ! " $& CDLYCAP VALUE(pf) Figure 4. Typical Overcurrent Delay Time vs CDLY |
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Similar Description - UCC3958DP-1 |
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