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NCP1729SN35T1G Datasheet(PDF) 9 Page - ON Semiconductor |
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NCP1729SN35T1G Datasheet(HTML) 9 Page - ON Semiconductor |
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9 / 23 page  NCP1729 www.onsemi.com 9 + 6 4 2 3 1 OSC Capacitors = 3.3 mF + + Vin 5 + + −Vout Figure 22. Negative Output Voltage Doubler A single device can be used to construct a negative voltage doubler. The output voltage is approximately equal to −2.0 Vin minus the forward voltage drop of each external diode. The performance characteristics for the above converter are shown below. Note that curves A and C show the circuit performance with economical 1N4148 diodes, while curves B and D are with lower loss MBRA120E Schottky diodes. 0 0 −2.0 20 10 −4.0 −6.0 −10.0 30 40 Iout, OUTPUT CURRENT (mA) −8.0 Figure 23. Doubler Load Regulation, Output Voltage vs. Output Current A B TA = 25°C C D A 3.0 1N4148 B 3.0 MBRA120E Curve Vin (V) All Diodes 118 107 Rout (W) C 5.0 1N4148 D 5.0 MBRA120E 91 85 |
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