IP33063 datasheet(3/5 Pages) SEME-LAB

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IP35063

IP33063

IP34063

Semelab plc. Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.

Prelim. 2/95

tON

tOFF

(tON + tOFF)MAX

Ipk(switch)

RSC

L(MIN)

VOUT + VF

VIN(MAX) - VSAT - VOUT

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

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.

— 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.

VOUT

— Desired output voltage, VOUT = 1.25 1 +

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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