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MC34063ABD Datasheet(Fiches technique) 9 Page - STMicroelectronics

Numéro de pièce MC34063ABD
Description  DC-DC CONVERTER CONTROL CIRCUITS
Télécharger  15 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
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 9 page
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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) − VsatVout
|
Vout|
+ VF
Vin
− Vsat
(ton + toff)max
1/fmin
1/fmin
1/fmin
CT
4.5x10
-5ton
4.5x10
-5 ton
4.5x10
-5ton
IPK(switch)
2Iout(max)[(ton/toff)+1]
2Iout(max)
2Iout(max)[(ton/toff)+1]
RSC
0.3/IPK(switch)
0.3/IPK(switch)
0.3/IPK(switch)
CO
Iout ton
Vripple (p−p)
IPK (switch) (ton + toff )
8Vripple (p−p)
Iout ton
Vripple (p−p)
L(min)
Vin(min) − Vsat
IPK (switch)
ton (max)
Vin(min) − Vsat − Vout
IPK (switch)
ton (max)
Vin(min) − Vsat
IPK (switch)
ton (max)
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
MC34063A/E
9/15




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