H34063AS Просмотр технического описания (PDF) - Hi-Sincerity Microelectronics
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H34063AS Datasheet PDF : 7 Pages
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HI-SINCERITY
MICROELECTRONICS CORP.
Spec. No. : IC200407
Issued Date : 2003.04.01
Revised Date : 2005.03.25
Page No. : 3/7
Application Information
Design Formula Table
Calculation
Step-Down
Step-Up
Voltage-Inverting
ton/toff
(Vout+VF)/(Vin(min) -Vsat-Vout)
(Vout+VF-Vin(min))/(Vin(min)-Vsat)
(|Vout|+VF)/(Vin(max)-Vsat)
(ton+toff) max
1/Fmin
1/Fmin
1/Fmin
CT
4*10-5ton
4*10-5ton
4*10-5ton
IC(sw)
2*Iout(max)
2*Iout(max)(ton+toff/toff)
2*Iout(max)(ton+toff/toff)
RS
0.3/IC(sw)
0.3/IC(sw)
0.3/IC(sw)
L(min)
(Vin(min)-Vsat/Ipk(sw))*ton(max)
(Vin(min)-Vsat/Ipk(sw))*ton(max)
(Vin(min)-Vsat/Ipk(sw))*ton(max)
CO
(Ipk(sw)*(ton+toff))/(8*Vripple(P-P))
Iout*ton/Vripple(P-P)
Iout*ton/Vripple(P-P)
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.
Vout: Desired output voltage. |Vout|=1.25*(1+RB/RA)
Iout: Desired output current
Fmin: Minimum desired output switching frequency at the selected values for Vin and Iout.
V : ripple(P-P) Desired peak to peak output ripple voltage in practice, the calculated value will need to be increased due to
the capacitor equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it
will directly effect the line and load regulation.
H34063AP, H34063AS
HSMC Product Specification
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