NCP347 ON Semiconductor, NCP347 Datasheet
NCP347
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NCP347 Summary of contents
Page 1
... Positive Overvoltage Protection Controller with Internal Low R and Status FLAG The NCP347 is able to disconnect the systems from its output pin in case wrong input operating conditions are detected. The system is positive overvoltage protected up to +28 V. Due to this device using internal NMOS, no external device is necessary, reducing the system cost and the PCB area of the application board ...
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... ENABLE / Microprocessor INPUT Core ESD Negative Protection Protection NCP347 V V Bat Bat D3 NCP347 OUT 6 7 OUT 8 4 Bat 3 270 K FLAG Figure 1. Typical Application Circuit Output Impedance = 200 k Delay Generator 200 kHz Oscillator ...
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... Human Body Model, 100 pF discharged through a 1.5 kW resistor following specification JESD22/A114. 3. Machine Model, 200 pF discharged through all pins following specification JESD22/A115. NCP347 Input Voltage Pin. This pin is connected to the power supply. The device system core is supplied by this input low ESR ceramic capacitor, or larger, must be connected between this pin and GND. ...
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... UVLO V rises up UVLO + UVLO hyst in OVLO V rises up OVLO threshold in NCP347MTAE NCP347MTAF NCP347MTAH OVLO V falls down OVLO + OVLO hyst in NCP347MTAE NCP347MTAF NCP347MTAH 5 GND, DS(on) in Load connected to V Idd No load 5 load Gnd Idd V uvlo Vol 1.2 V < V flag Sink 50 mA on/FLAG pin V Sink 1 ...
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... UVLO 0.3 V out FLAG Figure 3. Startup 1 dis out DS(on) FLAG Figure 5. Disable NCP347 TIMING DIAGRAMS <OVLO DS(on) t start 1.2 V 0.3 V http://onsemi.com 5 OVLO off V out DS(on) 0.3 V FLAG t stop 0.4 V Figure 4. Shutdown on Overvoltage Detection 1 ...
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... Figure 7. Startup V = Ch1 Figure 9. FLAG Going Up Delay V = Ch3, FLAG = Ch2 out Figure 11. Initial Overvoltage Delay V = Ch1 Ch2, FLAG = Ch3 in out NCP347 TYPICAL OPERATING CHARACTERISTICS = Ch3 out http://onsemi.com 6 Figure 8. Output Turn Off Time V = Ch1 Ch2 in out Figure 10. Alert Delay V = Ch1, FLAG = Ch3 out Figure 12 ...
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... Figure 13. Inrush Current with C I charge = 1 A, Output Wall Adaptor Inductance 1 mH Figure 15. Output Short Circuit (Zoom Fig. 14) NCP347 TYPICAL OPERATING CHARACTERISTICS = 100 mF, out http://onsemi.com 7 Figure 14. Output Short Circuit ...
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... NCP347 VOLTAGE DETECTION Figure 16. Simplified Diagram VOLTAGE DETECTION Figure 17. Simplified Diagram overtaking undervoltage UVLO (Figure 3). The NCP347 provides a FLAG output, which alerts the system that a fault NMOS FET has occurred additional delay, regarding DS(on) available output (Figure 3) is added between output signal rising up and to FLAG signal rising up ...
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... UVLO < V NCP347 out FLAG = Low Reset Timer V < UVLO > OVLO out FLAG = Low Timer Count OVLO > V > UVLO in Timer Check Reset Timer V < UVLO > OVLO Check V in FLAG = Low Timer Count Check EN ...
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... The PAD1 is internally isolated status, even if the in from the active silicon and should preferably be connected to ground. The PAD2 of the NCP347 package is connected to the internal NMOS drain and can be used to increase the heat transfer if necessary from an applications standpoint. Depending upon the power dissipated in the application, ...
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... R2 100 k 100 k NCP347 1 oz Sim 2 oz Sim 200 225 250 275 300 325350 OUT OUT 5 IN NCP347 FLAG GND Figure 22. Demo Board Schematic http://onsemi.com 11 Figure 21. Demo Board Layout OUTPUT C2 100 X7R 0805 not necessary ...
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... NCP347MTAHTBG †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. SELECTION GUIDE The NCP347 can be available in several undervoltage and overvoltage thresholds versions. Part number is designated as follows: NCP347MTxxTxG ...
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... MILLIMETERS DIM MIN NOM MAX A 0.70 0.75 0.80 A1 0.00 --- 0.05 A3 0.20 REF b 0.20 0.25 0.30 D 2.50 BSC D2 0.97 1.08 1.18 D3 0.57 0.68 0.78 e 0.50 BSC E 2.00 BSC E2 0.80 0.90 1.00 G 0.375 BSC G1 0.35 BSC K 0.20 --- --- L 0.20 0.30 0.40 SOLDERING FOOTPRINT* 2.50 0.95 1.13 0.05 0.73 DIMENSIONS: MILLIMETERS ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your loca Sales Representative 10X 0.58 10X 0.30 0.50 PITCH NCP347/D ...