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MC34063A View Datasheet(PDF) - Texas Instruments

Part NameMC34063A TI
Texas Instruments TI
Description1.5-A Peak Boost/Buck/Inverting Switching Regulators
MC34063A Datasheet PDF : 30 Pages
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MC33063A, MC34063A
SLLS636N – DECEMBER 2004 – REVISED JANUARY 2015
Typical Application (continued)
9.2.1.1 Design Requirements
The user must determine the following desired parameters:
Vsat = Saturation voltage of the output switch
VF = Forward voltage drop of the chosen output rectifier
The following power-supply parameters are set by the user:
Vin = Nominal input voltage
Vout = Desired output voltage
Iout = Desired output current
fmin = Minimum desired output switching frequency at the selected values of Vin and Iout
Vripple = Desired peak-to-peak output ripple voltage. The ripple voltage directly affects the line and load
regulation and, thus, must be considered. In practice, the actual capacitor value should be larger than the
calculated value, to account for the capacitor's equivalent series resistance and board layout.
9.2.1.2 Detailed Design Procedure
CALCULATION
ton/toff
(ton + toff)
toff
ton
CT
Ipk(switch)
RSC
L(min)
CO
Vout
VOLTAGE INVERTING
Vout + VF
Vin - Vsat
1
f
ton + toff
ton + 1
toff
(ton + toff )- toff
4 ´10-5 ton
2Iout(max )
æ
ç
è
ton
toff
+
ö
1÷
ø
0.3
Ipk(switch)
( ) æ
ç
ççè
Vin(min) - Vsat
Ipk(switch)
ö
÷
÷÷ø
ton(max
)
9 Iout ton
Vripple(pp)
-1.25
æ
çè1
+
R2
R1
ö
÷ø
See Figure 8
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