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NCP382HMN05A-ATXG Datasheet(PDF) 7 Page - ON Semiconductor |
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NCP382HMN05A-ATXG Datasheet(HTML) 7 Page - ON Semiconductor |
7 / 12 page NCP382 http://onsemi.com 7 FUNCTIONAL DESCRIPTION Overview The NCP382 is a dual high side power distribution switches designed to protect the input supply voltage in case of heavy capacitive loads, short circuit or over current. In addition, the high side MOSFETs are turned off during undervoltage or thermal shutdown condition. Thanks to the soft start circuitry, NCP382 is able to limit large current and voltage surges. Overcurrent Protection NCP382 switches into a constant current regulation mode when the output current is above the IOCP threshold. Depending on the load, the output voltage is decreased accordingly. − In case of hot plug with heavy capacitive load, the output voltage is brought down to the capacitor voltage. The NCP382 will limit the current to the IOCP threshold value until the charge of the capacitor is completed. VOUTX IOCP IOUTX Drop due to capacitor charge Figure 6. Heavy Capacitive Load − In case of overload, the current is limited to the IOCP value and the voltage value is reduced according to the load by the following relation: VOUTX + RLOAD2 IOCP (eq. 1) VOUTX IOCP IOUTX IOCP x RLOAD Figure 7. Overload − In case of short circuit or huge load, the current is limited to the IOCP value within TDET time until the short condition is removed. If the output remains shorted or tied to a very low voltage, the junction temperature of the chip exceeds TSDOCP value and the device enters in thermal shutdown (MOSFET is turned−off). VOUTX IOCP IOUTX Thermal Regulation Threshold Timer Regulation Mode TREG TOCP Figure 8. Short−Circuit Then, the device enters in timer regulation mode, described in 2 phases: − Off−phase: Power MOSFET is off during TOCP to allow the die temperature to drop. − On−phase: regulation current mode during TREG. The current is regulated to the IOCP level. The timer regulation mode allows the device to handle high thermal dissipation (in case of short circuit for example) within temperature operating condition. NCP382 stays in on−phase/off−phase loop until the over current condition is removed or enable pin is toggled. Remark: other regulation modes can be available for different applications. Please contact our On Semiconductor representative for availability. FLAG Indicator The FLAG pin is an open−drain MOSFET asserted low during overcurrent or overtemperature conditions. When an overcurrent fault is detected on the power path, FLAG pin is asserted low at the end of the associate deglitch time (TFOCP). Thanks to this feature, the FLAG pin is not tied low during the charge of a heavy capacitive load or a voltage transient on output. The FLAG pin remains low until the fault is removed. Then, the FLAG pin goes high at the end of TFGL Undervoltage Lock−out Thanks to a built−in under voltage lockout (UVLO) circuitry, the output remains disconnected from input until VIN voltage is above VUVLO. This circuit has a VHYST hysteresis witch provides noise immunity to transient condition. Thermal Sense Thermal shutdown turns off the power MOSFET if the die temperature exceeds TSD. A built-in hysteresis prevents the part from turning on until the die temperature cools at TRSD. |
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Similar Description - NCP382HMN05A-ATXG |
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