MAX1776EUA Ver la hoja de datos (PDF) - Maxim Integrated
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Fabricante
MAX1776EUA Datasheet PDF : 13 Pages
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24V, 600mA Internal Switch, 100% Duty Cycle,
Step-Down Converter
Table 3. Recommended Components
CIRCUIT
INPUT
VOLTAGE
(V)
1
10 to 24
2
10 to 24
3
10 to 24
4
10 to 24
5
5 to 15
6
5 to 15
7
5 to 15
8
5 to 15
MAXIMUM
LOAD
CURRENT
(mA)
600
300
150
75
600
300
150
75
ILX(PEAK)
CURRENT
(A)
INDUCTOR
10µH, 1.56A, 70mΩ
Toko D75F 646FY-100M,
1.20
10µH, 1.70A, 48mΩ
Sumida CDRH6D28-100NC,
or 10µH, 1.63A, 55mΩ
Toko D75C 646CY-100M 0.055
22µH, 1.17A, 120mΩ
Toko D75F 646FY-220M,
0.60
22µH, 1.09A, 115mΩ
Toko D75C 646CY-220M,
or 22µH, 1.20A, 95mΩ
Sumida CDRH6D28-220NC
0.30
47µH, 0.54A, 440mΩ
Sumida CDRH5D18-470
0.15
100µH, 0.29A, 766mΩ
Sumida CDRH4D28-101
1.20
5.4µH, 1.6A, 56mΩ
Sumida CDRH5D18-5R4
0.60
10µH, 1.04A, 80mΩ
Toko D73LC 817CY-100M
0.30
22µH, 0.41A, 294mΩ
Sumida CDRH4D18-220
0.15
47µH, 0.33A, 230mΩ
Coilcraft DS1608C-473
CAPACITOR
100µF, 6.3V
Sanyo POSCAP 6TPC100M
47µF, 6.3V
Sanyo POSCAP 6TPA47M
22µF, 6.3V, 1210 case
Taiyo Youden JMK325BJ226MM
10µF, 6.3V, X7R, 1206 case
Taiyo Youden JMK316BJ106ML
100µF, 6.3V
Sanyo POSCAP 6TPC100m
47µF, 6.3V
Sanyo POSCAP 6TPA47M
22µF, 6.3V, 1210 case
Taiyo Youden JMK325BJ226MM
10µF, 6.3V, X7R, 1206 case
Taiyo Youden JMK316BJ106ML
Diode Selection
The current in the external diode (D1 in Figure 1)
changes abruptly from zero to its peak value each time
the LX switch turns off. To avoid excessive losses, the
diode must have a fast turn-on time and a low forward
voltage.
Make sure that the diode’s peak current rating exceeds
the peak current limit set by the current limit, and that
its breakdown voltage exceeds VIN. Use Schottky
diodes when possible.
MAX1776 Stability
Instability is frequently caused by excessive noise on
OUT, FB, or GND due to poor layout or improper com-
ponent selection. Instability typically manifests itself as
“motorboating,” which is characterized by grouped
switching pulses with large gaps and excessive low-
frequency output ripple during no-load or light-load
conditions.
PC Board Layout and Grounding
High switching frequencies and large peak currents
make PC board layout an important part of the design.
Poor layout introduces switching noise into the feed-
back path, resulting in jitter, instability, or degraded
performance. High-power traces, highlighted in the
12 ______________________________________________________________________________________
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