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| AMC7660 Datasheet, PDF (9/11 Pages) ADDtek Corp – DC - DC CONVERTER CONTROL CIRCUIT | |||
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AMC7660
Typical Design Reference Table:
Calculation
ton/toff
ton + toff
Step-Down
Vout + VF
Vin(min) â Vsatâ Vout
1
f
Step-Up
Vout + VF â Vin(min)
Vin(min) â Vsat
1
f
Voltage-Inverting
?Vout? + VF
Vin â Vsat
1
f
toff
ton
CT
Ipk(switch)
RSC
L(min)
ton + toff
ton/toff + 1
ton + toff
ton/toff + 1
ton + toff
ton/toff + 1
(ton + toff) â toff
4.0 Ã 10-5 ton
(ton + toff) â toff
4.0 Ã 10-5 ton
(ton + toff) â toff
4.0 Ã 10-5 ton
2Iout(max)
0.3/Ipk(switch)
2Iout(max) (ton/toff + 1)
0.3/Ipk(switch)
2Iout(max) (ton/toff + 1)
0.3/Ipk(switch)
( ) ( ) ( ) (Vin(min) â Vsatâ Vout)
Ipk(switch)
ton(max)
(Vin(min) â Vsat)
Ipk(switch)
ton(max)
(Vin(min) â Vsat)
Ipk(switch)
ton(max)
CO
Ipk(switch)( ton + toff)
8Vripple(pp)
9
Iout ton
Vripple(pp)
9
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 â Minimum desired output switching frequency at the selected values of Vin and IO
Vripple(pp) â Desired peak â to â peak output ripple voltage.
Application concerns:
To get the best regulation performance, Low ESR capacitors at Vout are suggested.
Copyright © 2006 ADDtek Corp.
9
DD057_C -- JUNE 2006
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