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SI-8033JF 데이터시트(PDF) 5 Page - Allegro MicroSystems |
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SI-8033JF 데이터시트(HTML) 5 Page - Allegro MicroSystems |
5 / 9 page SI-8033JF Step-Down to 3.3 V, 1.5 A, DC/DC Converter www.allegromicro.com Switching Regulators 5 APPLICATIONS INFORMATION Input Capacitor (C1). Capacitors with low impedance for high-frequency ripple current must be used. Output Capacitor (C2). Capacitors with low impedance for high-frequency ripple current must be used. Especially when the C2 impedance is high, the switching waveform may not be normal at low temperatures. Film or tantalum capacitor for C2 may cause abnormal oscillations. Catch Diode (D1). Diode D1 must be a Schottky diode. Other diode types will result in increased forward voltage spikes, reverse current flow, increased IC power dissipa- tion during the off period, and possible destruction of the IC. Choke Coil (L1). If the winding resistance of the choke coil is too high, the circuit efficiency will decrease. As the overcurrent protection start current is approximately 2.5 A, attention must be paid to the heating of the coil by magnetic saturation due to overload. To reduce the output ripple, the inductor may be increased at the expense of excessive board area and cost. Typical Application SI-8033JF Soft-Start Capacitor (C3). Soft start for the converter is enabled by connecting a capacitor between terminal 5 and ground. The converter may be turned off by decreasing the terminal 5 voltage below 0.5 V with either an npn small-signal transistor or the output of open-collector TTL. If both a large soft-start capacitor and on/off control are desired, collector current limiting must be used to prevent transistor damage. No external voltage can be applied to terminal 5. Parallel Operation. Parallel operation to increase load current is not permitted. Overcurrent Protection. The SI-8000JF series has a built-in fold-back type overcurrent protection circuit, which limits the output current at a start-up mode. It thus cannot be used in applications that require current at the start-up mode such as: (1) constant-current load, (2) power supply with positive and negative outputs to common load (a center-tap type power supply), or (3) raising the output voltage by putting a diode or a resistor between the device ground and system ground. |
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