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VJ1206Y224KXXAT Datasheet(PDF) 8 Page - ON Semiconductor |
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VJ1206Y224KXXAT Datasheet(HTML) 8 Page - ON Semiconductor |
8 / 10 page AND8098/D http://onsemi.com 8 Figure 10. 12V / 100mA Buck Performance OUTPUT CURRENT (mA) 150 10 50 4 350 0 0 14 2 6 8 250 200 100 12 300 VIN = 100 Vdc VIN = 300 Vdc VIN = 200 Vdc OUTPUT CURRENT (mA) 150 50 50 20 300 0 0 80 10 30 40 250 200 100 60 VIN = 100 Vdc VIN = 300 Vdc VIN = 200 Vdc 70 (a) Load Regulation (b) Efficiency Dual Output Buck-boost with Increased Output Current Capability Replacing NCP1052 by NCP1055, which is with a current limit of 680 mA, the output current capability is increased. Larger value of inductor L is selected for high current. On the other hand, the current consumption of NCP1055 is higher than NCP1052 and the startup transient time is longer in a higher power application. Hence, the VCC capacitor is increased. When the VCC capacitor increased, its charging frequency is decreased. Output capacitor is also needed to be increased to reduce this lower-frequency charging current/ ripple. In addition, by adding one more auxiliary winding to the inductor a secondary output is made. A typical example is shown in Figure 11. In higher output current application, the load regulation is the major problem. The 5.1k Ω resistor plays an important role for the load regulation. The primary output voltage is higher than the secondary because it can increase the output current ability by stepping up the current in the transformer. The line regulation is shown in Figure 12 when the output currents are constant. Figure 11. Dual Output Buck-boost Universal AC Input GND 1N4005 10 µF 1N4005 1N4746 MUR160 5.1k MUR160 MUR160 22 µF 1 µF 150 µF 220 µF -24V / 200mA -5V / 150mA 1.2mH / 92.3 µH NCP1055P100 |
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