NCP345 ON Semiconductor, NCP345 Datasheet
NCP345
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NCP345 Summary of contents
Page 1
... NCP345 Overvoltage Protection IC The NCP345 overvoltage protection circuit (OVP) protects sensitive electronic circuitry from overvoltage transients and power supply faults when used in conjunction with an external P−channel FET. The device is designed to sense an overvoltage condition and quickly disconnect the input voltage supply from the load before any damage can occur ...
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... Positive Voltage supply disconnecting the P−channel FET. TRUTH TABLE IN CNTRL < < > > NCP345 UVLO COMP − − R4 GND (2) Figure 2. Detailed Block Diagram Pin Description which disconnects the FET. If this pin is not used thus disconnecting the FET. The nominal threshold CC falls below 2 ...
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... Turn ON Delay − CNTRL (CNTRL step down signal from 2.0 to 0.5 V; measured to 50% point of OUT)* Turn OFF Delay − CNTRL (CNTRL step up signal from 0 Output > V −1 *Turn ON Delay is guaranteed by design. NCP345 = 25°C unless otherwise noted.) A Pin − ...
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... CNTRL LOAD MOSFET = MGSF3441 0 50 100 150 200 250 300 350 400 450 500 Time (nsec) Figure 6. Typical Turn−off Time CNTRL to V NCP345 −40 −25 −10 Figure 4. Typical OUT Sink Current vs. Temperature − ...
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... V. A zener diode can be placed in parallel to the load to provide for secondary protection during the brief time that it takes for the NCP345 to detect the overvoltage fault and disconnect the MOSFET. The decision to use this secondary diode is a function of the charging currents expected, load ...
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... Once the over voltage is removed, the NCP345 will turn on the MOSFET. The turn on circuitry is designed to turn on the MOSFET more gradually to limit the in−rush current. Typical turn−on NCP345 performance is illustrated using the MGSF3441 in Figure 7 ...
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... SOLDERING FOOTPRINT* 0.95 0.037 1.0 0.039 *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. NCP345 THIN SOT−23−5 SN SUFFIX CASE 483−02 ISSUE E NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. ...
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... USA/Canada Japan: ON Semiconductor, Japan Customer Focus Center 2−9−1 Kamimeguro, Meguro−ku, Tokyo, Japan 153−0051 Phone: 81−3−5773−3850 http://onsemi.com 8 ON Semiconductor Website: http://onsemi.com Order Literature: http://www.onsemi.com/litorder For additional information, please contact your local Sales Representative. NCP345/D ...