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NCP1729SN35T1 Datasheet(PDF) 8 Page - ON Semiconductor |
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NCP1729SN35T1 Datasheet(HTML) 8 Page - ON Semiconductor |
8 / 22 page NCP1729 http://onsemi.com 8 Figure 20. Cascaded Devices for Increased Negative Output Voltage + 6 4 2 3 1 OSC Capacitors = 3.3 mF + Vin 5 + 6 4 2 3 1 OSC + 5 −Vout + Two or more devices can be cascaded for increased output voltage. Under light load conditions, the output voltage is approximately equal to −Vin times the number of stages. The converter output resistance increases dramatically with each additional stage. This is due to a reduction of input voltage to each successive stage as the converter output is loaded. Note that the ground connection for each successive stage must connect to the negative output of the previous stage. The performance characteristics for a converter consisting of two cascaded devices are shown below. Figure 21. Cascade Load Regulation, Output Voltage vs. Output Current −2.0 −4.0 −1.0 −5.0 −3.0 −10.0 Iout, OUTPUT CURRENT (mA) 020 40 −6.0 −7.0 −8.0 −9.0 10 30 A B TA = 25°C A 5.0 145 B 3.0 180 Curve Vin (V) Rout (W) |
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