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LM3641 Scheda tecnica(PDF) 9 Page - National Semiconductor (TI) |
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LM3641 Scheda tecnica(HTML) 9 Page - National Semiconductor (TI) |
9 / 16 page Product Description (Continued) Fail Safe Features The safety provided by the LM3641 goes beyond the normal operation of the IC. The design of the IC includes many as- pects that continue to assure protection of the cells even when malfunctions occur. • A rugged internal sense resistor offers precise overcur- rent response (magnitude and time) which allows smaller volume power MOSFETs to be used. If the internal resis- tor’s sense circuitry’s input open circuit (very unlikely), the MOSFET pair will turn OFF. The IC will fail safe. • If any pin becomes detached from the PCB, either the MOSFETs will turn OFF or the part will continue to protect the Cell. • The maximum cell voltage limit is trimmed by EEPROM and offers optimal accuracy. Each EEPROM cell has re- dundant EEPROM transistors for additional reliability. The EEPROM register also contains a parity check bit. In the rare event that an EEPROM bit would change state, the power MOSFETs will be turned OFF rather than allow the IC to operate out of specification. • The external MOSFETs are specified to provide ad- equate illegal charger withstand capability. Because of M3, the IC is designed to never be exposed to more than the actual cell voltage. Therefore the IC’s maximum rated supply voltage does not limit the magnitude of illegal charger voltages that can be protected by the IC. M3’s Vt also guarantees that shorted cells can not be charged. DS012931 13 FIGURE 2. Normal Termination of Discharging DS012931 14 FIGURE 3. Termination of Illegally High Charging DS012931 15 FIGURE 4. Load Applied in Overcharged State www.national.com 9 |
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