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LTC4001EUF Datasheet(PDF) 9 Page - Linear Technology |
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LTC4001EUF Datasheet(HTML) 9 Page - Linear Technology |
9 / 20 page 9 LTC4001 4001f OPERATIO Overvoltage, Chip Overtemperature and Short-Circuit Current Protection The LTC4001 includes overvoltage, chip overtemperature and several varieties of short-circuit protection. A comparator turns off both chargers (high rate and trickle) if battery voltage exceeds the float voltage by approximately 5%. This may occur in situations where the battery is accidentally disconnected while battery charg- ing is underway. A comparator continuously monitors on-chip temperature and will shut off the battery charger when chip temperature exceeds approximately 160 °C. Battery charging will be enabled again when temperature drops to approximately 150 °C. Short-circuit protection is provided in several different ways. First, a hard short on the battery terminals will cause the charge to enter trickle charge mode, limiting charge current to the trickle charge current (typically 50mA). Second, PWM charging is prevented if the high rate charge current is programmed far above the 2A maximum recommended charge current (via the PROG pin). Third, an overcurrent comparator monitors the peak inductor current. |
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