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BD9535MUV Datasheet(PDF) 11 Page - Rohm |
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BD9535MUV Datasheet(HTML) 11 Page - Rohm |
11 / 19 page 11/18 ● External Component Selection 1. Inductor (L) selection ※ Passing a current larger than the inductor’s rated current will cause magnetic saturation in the inductor and decrease system efficiency. In selecting the inductor, be sure to allow enough margin to assure that peak current does not exceed the inductor rated current value. ※ To minimize possible inductor damage and maximize efficiency, choose a inductor with a low (DCR, ACR) resistance. 2.Output Capacitor (CO) Selection Please give due consideration to the conditions in formula (10) below for output capacity, bear in mind that output rise time must be established within the soft start time frame. Note: Improper capacitor may cause startup malfunctions. 3. Input Capacitor (Cin) Selection A low ESR capacitor is recommended to reduce ESR loss and maximize efficiency. The inductor value is a major influence on the output ripple current. As formula (5) below indicates, the greater the inductor or the switching frequency, the lower the ripple current. Δ IL= (VIN-VOUT)×VOUT L×VIN×f [A]・・・(6) The proper output ripple current setting is about 30% of maximum output current. Δ IL=0.3×IOUTmax. [A]・・・(7) L= (VIN-VOUT)×VOUT L×VIN×f [H]・・・(8) (ΔIL: output ripple current; f: switch frequency) When determining the proper output capacitor, be sure to factor in the equivalent series resistance required to smooth out ripple volume and maintain a stable output voltage range. Output ripple voltage is determined as in formula (9) below. Δ VOUT=ΔIL×ESR+ESL×ΔIL/TON・・・(9) (ΔIL: Output ripple current; ESR: CO equivalent series resistance, ESL: CO equivalent series inductance) ※ In selecting a capacitor, make sure the capacitor rating allows sufficient margin relative to output voltage. Note that a lower ESR can minimize output ripple voltage. Tss: Soft start time Limit: Over current detection IOUT: Output current Input Capacitor The input capacitor selected must have low enough ESR resistance to fully support large ripple output, in order to prevent extreme over current. The formula for ripple current IRMS is given in (11) below. Where VIN=2×VOUT,IRMS= IOUT 2 Δ IL VIN IL L Co VOUT Output ripple current VIN L Co VOUT Cin Output capacitor Co≦ TSS×(Limit-IOUT) VOUT ・・・ (10) IRMS=IOUT× VOUT (VIN-VOUT) VIN [A]・・・(11) √ VIN L Co VOUT ESR ESL |
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