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ADP1611ARMZ-R7 データシート(PDF) 11 Page - Analog Devices

部品番号 ADP1611ARMZ-R7
部品情報  20 V,1.2 MHz Step-Up DC-to-DC Switching Converter
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メーカー  AD [Analog Devices]
ホームページ  http://www.analog.com
Logo AD - Analog Devices

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ADP1611
Rev. 0 | Page 11 of 20
Table 4. Inductor Manufacturers
Vendor
Part
L (µH)
Max DC Current
Max DCR (mΩ)
Height (mm)
CMD4D11-2R2MC
2.2
0.95
116
1.2
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
Sumida
847-956-0666
www.sumida.com
CR43-100
10
1.04
182
3.5
DS1608-472
4.7
1.40
60
2.9
Coilcraft 847-639-6400
www.coilcraft.com
DS1608-103
10
1.00
75
2.9
D52LC-4R7M
4.7
1.14
87
2.0
Toko 847-297-0070
www.tokoam.com
D52LC-100M
10
0.76
150
2.0
Using the duty cycle and switching frequency, fSW, determine
the on time by the following equation:
tON =
SW
f
D
(4)
The inductor ripple current (∆IL) in steady state is
∆ IL =
L
t
V
ON
IN ×
(5)
Solving for the inductance value, L,
L =
L
ON
IN
I
t
V
×
(6)
Make sure that the peak inductor current (the maximum input
current plus half the inductor ripple current) is below the rated
saturation current of the inductor. Likewise, make sure that the
maximum rated rms current of the inductor is greater than the
maximum dc input current to the regulator.
For duty cycles greater than 50%, which occur with input
voltages greater than one-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
SW
IN
OUT
MIN
f
V
V
L
L
×
=
>
A
8
.
1
(7)
CHOOSING THE INPUT AND OUTPUT CAPACITORS
The ADP1611 requires input and output bypass capacitors to
supply transient currents while maintaining constant input and
output voltage. Use a low equivalent series resistance (ESR)
input capacitor, 10 µF or greater, to prevent noise at the
ADP1611 input. Place the capacitor between IN and GND as
close to the ADP1611 as possible. Ceramic capacitors are
preferred because of their low ESR characteristics. Alternatively,
use a high value, medium ESR capacitor in parallel with a 0.1 µF
low ESR capacitor as close to the ADP1611 as possible.
The output capacitor maintains the output voltage and supplies
current to the load while the ADP1611 switch is on. The value
and characteristics of the output capacitor greatly affect the
output voltage ripple and stability of the regulator. Use a low
ESR output capacitor; ceramic dielectric capacitors are
preferred.
For very low ESR capacitors, such as ceramic capacitors, the
ripple current due to the capacitance is calculated as follows.
Because the capacitor discharges during the on time, tON, the
charge removed from the capacitor, QC, is the load current
multiplied by the on time. Therefore, the output voltage ripple
(∆VOUT) is
OUT
ON
L
OUT
C
OUT
C
t
I
C
Q
V
×
=
=
(8)
where:
COUT is the output capacitance.
IL is the average inductor current.
SW
ON
f
D
t
=
and
OUT
IN
OUT
V
V
V
D
=
Choose the output capacitor based on the following equation:
OUT
OUT
SW
IN
OUT
L
OUT
V
V
f
V
V
I
C
×
×
×
)
(
(9)
Table 5. Capacitor Manufacturers
Vendor
Phone No.
Web Address
AVX
408-573-4150
www.avxcorp.com
Murata
714-852-2001
www.murata.com
Sanyo
408-749-9714
www.sanyovideo.com
Taiyo–Yuden
408-573-4150
www.t-yuden.com


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