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NCP551SN28T1 Datasheet(PDF) 9 Page - ON Semiconductor |
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NCP551SN28T1 Datasheet(HTML) 9 Page - ON Semiconductor |
9 / 12 page NCP551, NCV551 http://onsemi.com 9 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 11 V Figure 21. Current Boost Regulator Figure 22. Current Boost Regulator with Short Circuit Limit Figure 23. Delayed Turn−on Figure 24. Input Voltages Greater than 12 V The NCP551 series can be current boosted with a PNP transis- tor. 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 regulated output can be achieved with input voltages that exceed the 12 V maximum rating of the NCP551 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 |
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