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UC2577TDKTTT-ADJ Datenblatt(PDF) 5 Page - Texas Instruments

Teilenummer UC2577TDKTTT-ADJ
Bauteilbeschribung  Simple Step-Up Voltage Regulator
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2. Inductor Selection (L)
A. Preliminary Calculations
To select the inductor, the calculation of the following
three parameters is necessary:
Dmax, the maximum switch duty cycle (0
≤ D ≤ 0.9):
Dmax
=
VOUT
+ VF − VINmin
VOUT
+ VF − 0.6V
where typically VF = 0.5V for Schottky diodes and VF =
0.8V for fast recovery diodes.
E
• T, the product of volts • time that charges the induc-
tor:
E
• T =
Dmax
• (VINmin − 0.6V)106
52,000Hz
(V• µs)
IIND, DC, the average inductor current under full load:
IIND, DC
=
1.05
• ILOADmax
1
− Dmax
B. Identify Inductor Value:
1. From Figure 4, identify the inductor code for the region
indicated by the intersection of E
• T and IIND, DC. This
code gives the inductor value in microhenries. The L or H
prefix signifies whether the inductor is rated for a maxi-
mum E
• T of 90Vµs (L) or 250Vµs (H).
2. If D < 0.85, go to step C. If D
≥ 0.85, calculate the
minimum inductance needed to ensure the switching
regulator’s stability:
0.3
0.4 0.45
0.35
0.5 0.6 0.7 0.8 0.9 1.0
1.5
2.0
2.5
3.0
20
30
35
25
40
45
50
60
70
80
90
100
200
150
L47
L68
L100
L150
L220
L330
H2200
L680
H1500
H1000
H680
H470
H330
H220
H150
L470
IIND, DC (A)
Figure 4. Inductor Selection Graph
If Lmin is smaller than the inductor values found in step
B1, go on to step C. Otherwise, the inductor value found
in step B1 is too low; an appropriate inductor code
should be obtained from the graph as follows:
1.
Find the lowest value inductor that is greater than
Lmin .
2.
Find where E
• T intersects this inductor value to
determine if it has an L or H prefix. If E
• T intersects
both the L and H regions, select the inductor with an
H prefix.
C.
Inductor Selection
Select an inductor from the table of Figure 5 which cross
references the inductor codes to the part numbers of the
three different manufacturers. The inductors listed in this
table have the following characteristics:
AIE (ferrite, pot-core inductors): Benefits of this type
are low etectromagnetic interference (EMI), small
physical size, and very low power dissipation (core
loss).
Pulse (powdered iron, toroid core inductors): Bene-
fits are low EMI and ability to withstand E
• T and
peak current above rated value better than ferrite
cores.
Renco (ferrite, bobbin-core inductors): Benefits are
low cost and best ability to withstand E
• T and peak
current above rated value. Be aware that these in-
ductors generate more EMI than the other types, and
this may interfere with signals sensitive to noise.
UC2577-ADJ
Note: This chart assumes that the inductor ripple current inductor is approximately 20% to 30% of the average inductor current
(when the regulator is under full load). Greater ripple current causes higher peak switch currents and greater output ripple volt-
age. Lower ripple current is achieved with larger value inductors. The factor of 20% to 30% is chosen as a convenient balance
between the two extremes.
APPLICATIONS INFORMATION (cont.)
5


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