Datenblatt-Suchmaschine für elektronische Bauteile |
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LA5735M Datenblatt(PDF) 4 Page - Sanyo Semicon Device |
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LA5735M Datenblatt(HTML) 4 Page - Sanyo Semicon Device |
4 / 7 page LA5735M No.A0588-4/7 Choke coil L1 • Note that choke coil heating due to overload or load shorting may be a problem. The inductance value can be determined from the following equation once the input voltage, output voltage, and current ripple conditions are known. ∆IR indicates the ripple current value. Reference example : VIN = 12V, VOUT = 5V, ∆IR = 150mA L = VIN - VOUT - Vsat ∆IR × Ton = 12 - 5.0 - 1.0 0.15 × 1.58 × 10-6 ≈ 68 µH Ton = T ((VIN - VOUT - Vsat)/(VOUT + VF)) + 1 Toff = T - Ton t : Switching repetition period················· 3.33 µs is assumed for the calculation VF : Schottky diode forward voltage ······ 0.4V is assumed for the calculation • Inductance current : peak value The ripple current peak value must be held within the rated current values for the inductor used. Here, IRP is the peak value of the ripple current. IRP can be determined from the following equation. Reference example : VIN = 12V, VOUT = 5V, IOUT = 0.5A, L = 68µH IRP = IOUT + VIN - VOUT - Vsat 2L × Ton = 0.5 + 12 - 5.0 - 1.0 2 × 68 × 10-6 × 1.58 × 10 -6 ≈ 0.57A • Inductance current : ripple current value Here ∆IR is the ripple current. ∆IR can be determined from the following equation. If the load current becomes less than one half the ripple current, the inductor current will become discontinuous. ∆IR = VIN - VOUT - Vsat L × Ton = 12 - 5.0 - 1.0 68 × 10-6 × 1.58 × 10 -6 ≈ 0.15A Diode D1 • A Schottky barrier diode must be used for this diode. If a fast recovery diode is used, it is possible that the IC could be destroyed by the applied reverse voltage due to the recovery and the on-state voltage. • Diode current (peak current) Applications must be designed so that the peak value of the diode current remains within the rated current of the diode. The peak value of the diode current will be the same current as the peak value of the inductor current. • Repetitive peak reverse voltage Applications must be designed so that the repetitive peak reverse voltage remains within the voltage rating of the diode. Here, VRRM is the repetitive peak reverse voltage. VRRM can be determined from the following equation. VRRM ≥ VCC Since noise voltage and other terms will be added in actual operation, the voltage handling capacity of the device should be about 1.5 times that given by the above calculation. |
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