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NCV511SN25T1G Datasheet(PDF) 9 Page - ON Semiconductor |
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NCV511SN25T1G Datasheet(HTML) 9 Page - ON Semiconductor |
9 / 11 page NCP511, NCV511 www.onsemi.com 9 0 3 100 2 120 40 160 Time (ms) 2 1 20 4 1 0 140 80 60 0 TA = 25°C Vin = 3.5 V Vout = 3.0 V R = 1.0 M W C = 1.0 mF R = 1.0 M W C = 0.1 mF No Delay 3 Output R 1 2 3 5 4 Input 1.0 mF 1.0 mF Output 1 2 3 5 4 Input 1.0 mF 1.0 mF Q2 Q1 R3 R1 R2 Output 1 2 3 5 4 Input 1.0 mF 1.0 mF Output 1 2 3 5 4 Enable 1.0 mF 1.0 mF C Output 1 2 3 5 4 Input 1.0 mF 1.0 mF Q1 R 5.6 V 0 100 120 40 160 Time (ms) 20 140 80 60 R = 1.0 M W C = 1.0 mF R = 1.0 mW C = 0.1 mF No Delay Figure 18. Current Boost Regulator Figure 19. Current Boost Regulator with Short Circuit Limit Figure 20. Delayed Turn−on Figure 21. Delayed Turn−on Figure 22. Input Voltages Greater than 6.0 V The NCP511 series can be current boosted with a PNP transist- or. Resistor R in conjunction with VBE of the PNP determines when the pass transistor begins conducting; this circuit is not short circuit proof. Input/Output differential voltage minimum is increased by VBE of the pass resistor. Short circuit current limit is essentially set by the VBE of Q2 and R1. ISC = ((VBEQ2 − ib * R2) / R1) + IO(max) Regulator If a delayed turn−on is needed during power up of several volt- ages then the above schematic can be used. Resistor R, and capacitor C, will delay the turn−on of the bottom regulator. A few values were chosen and the resulting delay can be seen in Figure 21. The graph shows the delay between the enable signal and output turn−on for various resistor and capacitor values. A regulated output can be achieved with input voltages that exceed the 6.0 V maximum rating of the NCP511 series with the addition of a simple pre−regulator circuit. Care must be taken to prevent Q1 from overheating when the regulated output (Vout) is shorted to GND. Q1 R APPLICATION CIRCUITS |
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