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MC33063A 数据表(PDF) 9 Page - Texas Instruments

部件名 MC33063A
功能描述  1.5-A PEAK BOOST/BUCK/INVERTING SWITCHING REGULATORS
Download  16 Pages
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

MC33063A 数据表(HTML) 9 Page - Texas Instruments

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APPLICATION INFORMATION
V
out ) VF
V
in(min) * Vsat * Vout
V
out ) VF
V
in * Vsat
V
out ) VF * Vin(min)
V
in(min) * Vsat
1
f
1
f
1
f
ton ) toff
ton
t
off
) 1
ton ) toff
ton
t
off
) 1
ton ) toff
ton
t
off
) 1
ton ) toff * toff
ton ) toff * toff
ton ) toff * toff
4
10*5 ton
4
10*5 ton
4
10*5 ton
2I
out(max)
2I
out(max)
ton
t
off
) 1
2I
out(max)
ton
t
off
) 1
0.3
I
pk(switch)
0.3
I
pk(switch)
0.3
I
pk(switch)
V
in(min) * Vsat
I
pk(switch)
t
on(max)
V
in(min) * Vsat * Vout
I
pk(switch)
t
on(max)
V
in(min) * Vsat
I
pk(switch)
t
on(max)
9
I
outton
V
ripple(pp)
9
I
outton
V
ripple(pp)
I
pk(switch) ton ) toff
8V
ripple(pp)
1.25(1 )
R2
R1
)
1.25(1 )
R2
R1
)
*1.25(1 )
R2
R1
)
MC33063A, MC34063A
1.5-A PEAK BOOST/BUCK/INVERTING SWITCHING REGULATORS
SLLS636J – DECEMBER 2004 – REVISED OCTOBER 2005
CALCULATION
STEP UP
STEP DOWN
VOLTAGE INVERTING
ton/toff
(ton + toff)
toff
ton
CT
Ipk(switch)
RSC
L(min)
CO
Vout
See Figure 6
See Figure 8
See Figure 10
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


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