ADP1610(Rev0) データシートの表示（PDF） - Analog Devices
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ADP1610 Datasheet PDF : 16 Pages
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ADP1610
Table 4. Inductor Manufacturers
Vendor
Part
Sumida
CMD4D11-2R2MC
847-956-0666
CMD4D11-4R7MC
www.sumida.com
CDRH4D28-100
CDRH5D18-220
CR43-4R7
CR43-100
Coilcraft 847-639-6400 DS1608-472
www.coilcraft.com
DS1608-103
Toko 847-297-0070
D52LC-4R7M
www.tokoam.com
D52LC-100M
L (µH)
2.2
4.7
10
22
4.7
10
4.7
10
4.7
10
Using the duty cycle and switching frequency, fSW, determine the
on-time by the following equation:
tON = D
(4)
f SW
The inductor ripple current (∆IL) in steady state is
∆IL = VIN × tON
(5)
L
Solving for the inductance value, L,
L = VIN × t ON
(6)
∆I L
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:
L > LMIN
=
VOUT −VIN
1.8 A × f SW
(7)
CHOOSING THE INPUT AND OUTPUT CAPACITORS
The ADP1610 requires input and output bypass capacitors to
supply transient currents while maintaining constant input and
output voltage. Use a low ESR (equivalent series resistance),
10 µF or greater input capacitor to prevent noise at the
ADP1610 input. Place the capacitor between IN and GND as
close to the ADP1610 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 ADP1610 as possible.
Max DC Current
0.95
0.75
1.00
0.80
1.15
1.04
1.40
1.00
1.14
0.76
Max DCR (mΩ)
116
216
128
290
109
182
60
75
87
150
Height (mm)
1.2
1.2
3.0
2.0
3.5
3.5
2.9
2.9
2.0
2.0
The output capacitor maintains the output voltage and supplies
current to the load while the ADP1610 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
∆VOUT
= QC
COUT
= I L ×tON
COUT
(8)
where:
COUT is the output capacitance,
IL is the average inductor current,
t ON
=
D
f SW
(9)
and
D = VOUT −VIN
(10)
VOUT
Choose the output capacitor based on the following equation:
COUT
≥
I L ×(VOUT −VIN )
f SW ×VOUT × ∆VOUT
(11)
Table 5. Capacitor Manufacturers
Vendor
Phone No.
AVX
408-573-4150
Murata
714-852-2001
Sanyo
408-749-9714
Taiyo–Yuden 408-573-4150
Web Address
www.avxcorp.com
www.murata.com
www.sanyovideo.com
www.t-yuden.com
Rev. 0 | Page 11 of 16
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