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ADD8754 Datasheet(PDF) 13 Page - Analog Devices

Part # ADD8754
Description  LCD Panel Power, VCOM, and Gate Modulation
PDF  28 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADD8754 Datasheet(HTML) 13 Page - Analog Devices

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ADD8754
Rev. 0 | Page 13 of 28
Inductor Selection
The inductor ripple current (ΔIL) in steady state is
The inductor is an integral part of the step-up converter. It
stores energy during the switch-on time and transfers that
energy to the output through the output diode during the
switch-off time. Use inductance in the range of 1 μH to 22 μH.
In general, lower inductance values have higher saturation
current and lower series resistance for a given physical size.
However, lower inductance results in higher peak current,
which can lead to reduced efficiency and greater input and/or
output ripple and noise. Peak-to-peak inductor ripple current at
close to 30% of the maximum dc input current typically yields
an optimal compromise.
L
t
V
ON
IN ×
ΔI =
(5)
L
Solving for the inductance value, L,
L
ON
IN
I
t
V
Δ
×
L
=
(6)
Make sure that the peak inductor current (the maximum input
current plus half of the inductor ripple current) is less than the
rated saturation current of the inductor. In addition, ensure that
the maximum rated rms current of the inductor is greater than
the maximum dc input current to the regulator.
For determining the inductor ripple current, the input (VIN) and
output (VOUT) voltages determine the switch duty cycle (D) by
the following equation:
D =
OUT
IN
OUT
V
V
V
−
(3)
For duty cycles greater than 50% that occur with input voltages
greater than half the output voltage, slope compensation is
required to maintain stability of the current-mode regulator.
For stable current-mode operation, ensure that the selected
inductance is equal to or greater than LMIN:
Using the duty cycle and switching frequency, fSW, determine
the on time by using the following equation:
SW
IN
OUT
MIN
f
V
V
L
L
×
−
=
>
A
8
.
1
(7)
SW
f
D
t
=
(4)
ON
Table 9. Inductor Manufacturers
Vendor
Part
L (μH)
Max DC Current
Max DCR (mΩ)
Height (mm)
CMD4D11-2R2MC
2.2
0.95
116
1.2
Sumida
www.sumida.com
CMD4D11-4R7MC
4.7
0.75
216
1.2
CDRH4D28-100
10
1.00
128
3.0
CDRH5D18-220
22
0.80
290
2.0
CR43-4R7
4.7
1.15
109
3.5
CR43-100
10
1.04
182
3.5
DS1608-472
4.7
1.40
60
2.9
Coilcraft
www.coilcraft.com
DS1608-103
10
1.00
75
2.9
D52LC-4R7M
4.7
1.14
87
2.0
Toko
www.tokoam.com
D52LC-100M
10
0.76
150
2.0



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