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Application Information (Continued)
noise filtering of the input voltage spikes due to this rapidly
changing current. Select an input filter capacitor with a surge
current rating sufficient for the power-up surge from the input
power source. The power-up surge current is approximately
the capacitor’s value (F) times the voltage rise rate (V/s).
The input current ripple can be calculated as:
TABLE 1. Suggested Inductors and Their Suppliers
Model
Vendor
Phone
FAX
IDC2512NB100M
Vishay
408-727-2500
408-330-4098
DO1608C-103
Coilcraft
847-639-6400
847-639-1469
ELL6RH100M
Panasonic
714-373-7366
714-373-7323
CDRH5D18-100
Sumida
847-956-0666
847-956-0702
OUTPUT CAPACITOR SELECTION
The output filter capacitor smoothes out current flow from the
inductor to the load, maintaining a steady output voltage
during transient load changes and reduces output voltage
ripple. These capacitors must be selected with sufficient
capacitance and sufficiently low ESR to perform these func-
tions.
The output ripple current can be calculated as:
Voltage peak-to-peak ripple due to capacitance =
Voltage peak-to-peak ripple due to ESR =
Voltage peak-to-peak ripple, root mean squared =
Note that the output ripple is dependent on the current ripple
and the equivalent series resistance of the output capacitor
(R
ESR).
Because these two components are out of phase the rms
value is used. The R
ESR is frequency dependent (as well as
temperature dependent); make sure the frequency of the
R
ESR given is the same order of magnitude as the switching
frequency.
TABLE 2. Suggested Capacitors and Their Suppliers
Model
Type
Vendor
Phone
FAX
10 F for C
OUT
VJ1812V106MXJAT
Ceramic
Vishay
408-727-2500
408-330-4098
LMK432BJ106MM
Ceramic
Taiyo-Yuden
847-925-0888
847-925-0899
JMK325BJ106MM
Ceramic
Taiyo-Yuden
847-925-0888
847-925-0899
4.7 F for C
IN
VJ1812V475MXJAT
Ceramic
Vishay
408-727-2500
408-330-4098
EMK325BJ475MN
Ceramic
Taiyo-Yuden
847-925-0888
847-925-0899
C3216X5R0J475M
Ceramic
TDK
847-803-6100
847-803-6296
TABLE 3. Adjustable LM3670 Configurations for Various V
OUT
VOUT (V)
R1 (K
)R2 (K)
C1 (pF)
C2 (pF)
L (H)
CIN (F)
COUT (F)
0.7
80.6
200
150
4.7
10
0.8
120
200
130
none
4.7
10
0.9
160
200
100
none
4.7
10
1.0
200
82
none
4.7
10
LM3670
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LM368H-6.2 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 6.2 V, MBCY8
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