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IP33063N Datasheet(PDF) 3 Page - Seme LAB |
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IP33063N Datasheet(HTML) 3 Page - Seme LAB |
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3 / 5 page  IP35063 IP33063 IP34063 Semelab plc. Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612. Prelim. 2/95 tON tOFF (tON + tOFF)MAX CT Ipk(switch) RSC L(MIN) CO VOUT + VF VIN(MAX) - VSAT - VOUT 1 fMIN 4 x 10-5 tON 2 IOUT(MAX) 0.33 / Ipk(switch) VIN(MAX) - VSAT - VOUT tON(MAX) Ipk(switch) Ipk(switch) (tON + tOFF) 8 Vripple(p–p) VOUT + VF - VIN(MIN) VIN(MIN) - VSAT 1 fMIN 4 x 10-5 tON tON + tOFF 2 IOUT(MAX) tOFF 0.33 / Ipk(switch) VIN(MIN) - VSAT tON(MAX) Ipk(switch) IOUT tON Vripple DESIGN FORMULA TABLE Calculation Step–Down Step–Up KEY VSAT — Saturation voltage of the output switch. VF — Forward voltage drop of the ringback rectifier. The following power supply characteristics must be chosen:– VIN — Nominal input voltage. If this voltage is not constant, then use VIN(MAX) for step–down and VIN(Min) for step–up converter. R2 VOUT — Desired output voltage, VOUT = 1.25 1 + . R1 IOUT — Desired output current. fMIN — Minimum desired output switching frequency at the selected values for VIN and IO. Vripple(p–p) — Desired peak–to–peak output ripple voltage. In practice, the calculated value will need to be increased due to the capacitors equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly affect the line and load regulation. ( ) |
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