MC34063ECD データシートの表示（PDF） - STMicroelectronics
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MC34063ECD Datasheet PDF : 15 Pages
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MC34063A/E
Calculation
Parameter
Step-Up
(Discontinuos mode)
Step-Down
(Continuos mode)
Voltage Inverting
(Discontinuos mode)
ton/toff
Vout + VF − Vin(min)
Vin(min) − Vsat
Vout + VF
Vin(min) − Vsat− Vout
| Vout| + VF
Vin − Vsat
(ton + toff)max
CT
1/fmin
4.5x10-5ton
1/fmin
4.5x10-5ton
1/fmin
4.5x10-5ton
IPK(switch)
2Iout(max)[(ton/toff)+1]
2Iout(max)
2Iout(max)[(ton/toff)+1]
RSC
CO
0.3/IPK(switch)
≅
Iout ton
Vripple (p−p)
0.3/IPK(switch)
IPK (switch) (ton + toff )
8Vripple (p−p)
0.3/IPK(switch)
≅
Iout ton
Vripp le (p−p)
L(min)
Vin(min) − Vsat
IPK (switch)
ton
(max)
Vin(min) − Vsat −
IPK (switch)
Vo u t
ton
(m a x)
Vin(min) −
IPK (swit
Vsat
c h)
ton
(ma
x
)
NOTES:
Vsat = Saturation voltage of the output switch
VF = Foward voltage drop of the output rectifier
THE FOLLOWING POWER SUPPLY CHARACTERISTICS MUST BE CHOSEN:
Vin = Nominal input voltage
Vout = Desired output voltage, |Vout| = 1.25(1+R2/R1)
Iout = Desired output current
fmin = Minimum desired output switching frequency at the selected values of Vin and Io
Vripple = Desired peak to peak output ripple voltage. In practice, the calculaed capacitor value will and to be increased due to its 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.
Step-up With External NPN Switch
9/15
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