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MC33466H-33JT1 bảng dữ liệu(PDF) 11 Page - ON Semiconductor

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Giải thích chi tiết về linh kiện  FIXED FREQUENCY PWM MICROPOWER DC-to-DC CONVERTER
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MC33466
11
MOTOROLA ANALOG IC DEVICE DATA
Figure 22. Design Equations
Calculation
Step–Down
Step–Up
Flyback
L
t
(V
in
–V
O
)(ton)
2I
O
t
(V
in
)(ton)
2I
in
t
(V
in
)(ton)
2I
in
ton
D
fs
D
fs
D
fs
D
t
(V
O
)
(V
in
)
t
(V
O *
V
in
)
(V
O
)
t
V
O
Ns
Np
(V
in
)
) V
O
IL(avg)
IO
Iin
Iin
IL(pk)
(V
in *
V
O
)(ton)
L
(V
in *
Vsat)(ton)
L
(V
in *
Vsat)(ton)
L
Vripple(pp)
I
L(pk)
1
8fsC
O
2
) (ESR)
2
1
2
The following converter design characteristics must be chosen:
Vin – Nominal Operating dc input voltage
VO – Desired dc output voltage
IO – Desired dc output current
Vripple(pp) – Desired peak–to–peak output ripple voltage. For best performance the ripple voltage should be kept to a low value since it will directly
affect line and load regulation. Capacitor CO should be a low equivalent series resistance (ESR) electrolytic designed for switching regulator
applications.
D – Operating duty cycle = ton(fs). This parameter must be chosen to be <0.5 for step–up and flyback applications.
NOTES: 1. Vsat – Saturation voltage of the switching transistor.
2. Iin – DC input switch.
3. fs – Switching frequency, nominally 50 kHz.
4. RO – Load resistance. RO = VO/IO.
5. Ns, Np – In flyback applications Ns is the number of turns of the secondary transformer winding; Np is the number of the primary winding turns.
Design Example – Step–down Application
Required: Vin = 8.0 V, an output voltage of 3.3 V at 300 mA is desired with an output ripple of less than 300 mVpp.
R
O +
V
O
I
O
+ 11 W
1. Because this is a discontinuous mode design, D
t
V
O
V
in
+ 3.3
8
+ 0.41. Choose D = 0.33.
2. ton [
D
fs
+ 0.33
(50 kHz)
+ 6.6 µs.
3. L
t
(V
in
–V
O
)(ton)
2I
O
+
(8 – 3.3)(6.6
µs)
[2(0.3)]
+ 51.7 µH.
Choose L = 47
µH. Coilcraft part number DO3316P–473.
4. I
L(pk) +
(V
in
–V
O
)(ton)
L
+
(8 – 3.3)(6.6
µs)
(47
µH)
+ 660 mA.
5. ESR
t
V
ripple(pp)
I
L(pk)
+
(300 mV)
(660 mA)
+ 0.455 W.
Choose CO = two parallel AVX 330 µF tantalum chip capacitors. Part Number TAJE337M006.
Specified maximum ESR for each is 0.9
Ω.
The complete design schematic is shown in Figure 19.


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