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SI-8001FFE 数据表(PDF) 6 Page - Sanken electric |
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SI-8001FFE 数据表(HTML) 6 Page - Sanken electric |
6 / 9 page 6 SANKEN ELECTRIC CO., LTD. DC-to-DC Step-Down Converter SI-8001FFE 27469.057 Component Selection VIN 1 GND GND 2 4 3 GND SS IN SW ADJ C1 C2 L1 Di VO R1 R2 IADJ 5 C3 Soft Start Only SI-8001FFE Component Rating C1 470 μF C2 680 μF C3 0.1 μF (For soft start function) Di RK-46 (Sanken) L1 47 μH Diode Di A Schottky-barrier diode must be used for Di. If other diode types are used, such as fast recovery diodes, the IC may be destroyed because of the reverse voltage applied by the recovery voltage or ON voltage. Choke Coil L1 If the winding resistance of the choke coil is too high, the efficiency may be reduced below rating. Because the overcurrent protection start current is approximately 4.2 A, atten- tion must be paid to the heating of the choke coil by magnetic saturation due to overload or short-circuited load. Capacitors C1, C2, and C3 Because for SMPS, large ripple currents flow across C1 and C2, capacitors with high frequency and low impedance must be used. If the impedance of C2 is too high, the switching waveform may not be normal at low tempera- tures. Do not use either OS or tantalum types of capacitors for C2, because those cause an abnormal oscillation. C3 is required only if the soft start function is used. If not using soft-start, leave the SS terminal open. A pull-up resistor is pro- vided inside the IC. Resistor Bridge R1 and R2 comprise the resistor bridge for the output voltage, VO, and are calculated as follows: () () ) , and ( () Ω × == = Ω × − = − = − − k I V R2 V I V V R1 AD J AD J O AD J AD J O 8 . 0 10 1 8 . 0 10 1 8 . 0 3 3 IADJ should always be set to 1 mA. Note that R2 should always be present to ensure stable operation, even if VO, is set to 0.8 V (that is, even if there is no R1). VO should be at least VIN + 8%. R1 R2 GND L1 C1 C2 U1 C3 S1 D1 Vin Vsw Vout Vadj/Vos R1 R2 L1 GND GND C3 S1 Vadj/Vos Vout Vsw D1 Vin C1 C2 U1 GND All external components should be mounted as close as possible to the SI-8001FFE. The ground of all components should be connected at one point. Recommended PCB Layout Typical Application Diagram |
类似零件编号 - SI-8001FFE |
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类似说明 - SI-8001FFE |
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