AMC7660DMF datasheet(9/11 Pages) ADDTEK

9 / 11 page

AMC7660

DD057_C

JUNE 2006

Typical Design Reference Table:

Calculation

Step-Down

Step-Up

Voltage-Inverting

ton/toff

Vout + VF

Vin(min) − Vsat− Vout

Vout + VF − Vin(min)

Vin(min) − Vsat

out? + VF

Vin − Vsat

ton + toff

toff

ton + toff

ton/toff + 1

ton + toff

ton/toff + 1

ton + toff

ton/toff + 1

ton

(ton + toff) − toff

4.0

× 10-5 t

4.0

× 10-5 t

4.0

× 10-5 t

Ipk(switch)

2Iout(max)

2Iout(max) (ton/toff + 1)

RSC

0.3/Ipk(switch)

L(min)

( (Vin(min)−Vsat−Vout)

Ipk(switch)

on(max)

((Vin(min)−Vsat)

Ipk(switch)

on(max)

((Vin(min)−Vsat)

Ipk(switch)

on(max)

Ipk(switch)( ton + toff)

8Vripple(pp)

Iout ton

Vripple(pp)

Iout ton

Vripple(pp)

VF:

Forward Voltage drop of the output rectifier

Vsat:

Saturation voltage of the output switch.

The following power supply characteristics must be chosen:

Vin - Nominal input voltage

Vout - Desired output voltage, ?Vout? = 1.25(1 + R1/R2)

Iout - Desired output current.

fmin – Minimum desired output switching frequency at the selected values of Vin and IO

Vripple(pp) – Desired peak – to – peak output ripple voltage.

Application concerns:

To get the best regulation performance, Low ESR capacitors at Vout are suggested.

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