NCP1729 1 6 OSC −Vout Vin 2 5 + + + + + + + 3 4 Capacitors = 3.3 F Figure 24. Negative Output Voltage Tripler A single device can be used to construct a negative voltage tripler. The output voltage is approximately equal to −3.0 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 −2.0 A −4.0 AGE T C B −6.0 CurveVin (V)All DiodesRout () −8.0 A 3.0 1N4148 247 −10.0 D B 3.0 MBRA120E 228 , OUTPUT VOL out −12.0 V C 5.0 1N4148 198 −14.0 TA = 25°C D 5.0 MBRA120E 188 −16.0 0 10 20 30 40 50 Iout, OUTPUT CURRENT Figure 25. Tripler Load Regulation, OutputVoltage vs. Output Currenthttp://onsemi.com10
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