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AZ34063AMTR-E1 Datasheet(PDF) 8 Page - BCD Semiconductor Manufacturing Limited |
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AZ34063AMTR-E1 Datasheet(HTML) 8 Page - BCD Semiconductor Manufacturing Limited |
8 / 13 page 1.5A STEP-DOWN/STEP-UP/INVERTING DC-DC CONVERTER AZ34063A Data Sheet 8 Sep. 2006 Rev. 1. 3 BCD Semiconductor Manufacturing Limited Typical Applications Figure 10. Step-Up Converter (Note 5) Note 5: This is a typical step-up converter configuration. In the steady state, if the resistor divider voltage at pin 5 is greater than the voltage in the non-inverting input, which is 1.25V determined by the internal reference, the output of the comparator will go low. At the next swithching period, the output switch will not conduct and the output voltage will eventually drop below its nominal voltage until the divider voltage at pin 5 is lower than 1.25V. Then the output of the comparator will go high, the output switch will be allowed to conduct. Since VPIN5=VOUT* R2/(R1+R2)=1.25(V), the output voltage can be decided by VOUT=1.25 * (R1+R2)/R2 (V). + - Ipk B 1.25V Reference Regulator A 5 S R Q I PK C T OSC V IN 12V C1 100 µF R3 180 C T 470pF L1 150 µH D1 1N5819 L2 1.0 µΗ C3 100 µF Optional Filter V OUT + + U1 AZ34063A R1 47k R2 2.2k C2 330 µF 28V/175mA + Rsc 0.22 6 7 8 1 2 3 4 V OUT |
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