Laird AC4490, Руководство по интеграции оборудования

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AC4490 Hardware Integration Guide
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A
PPENDIX
II: S
AMPLE
P
OWER
S
UPPLY
Below is a simple switching power supply that provides enough current to easily power any Laird OEM
module. It utilizes low cost, off-the-shelf components that fit into a small area. This supply has an input
voltage range of +6 volts to +18 volts and will 3.4 volts at 1.5 amps.
Included is a Bill of Materials with manufacturer’s name and part numbers, Schematic and a sample PCB
Layout . It is important to follow the layout suggestions and use large areas of copper to connect the devices
as shown in the layout. It is also important to hook up the ground traces as shown and use multiple vias to
connect input and output capacitors to the bottom side ground plane.
If the input voltage is less than 12 volts, C1 and C2 can be replaced with a single 100µF 20 volt capacitor
(same part number as C7). This will reduce board space and costs further. If you are powering an AC5124
module, R1 can be changed to a 373 ohm 1% resistor. This will change the output to +5 volts at 1.0 amps.
Bill of Materials
Table 9: Power Supply Bill of Materials
Qty Reference Value Description Mfg. Mfg. Part number
1 R1 210 Res, 0603, 210, 1/16 W, 1% KOA RK73H1JT2100F
1 R2 127 Res, 0603, 127, 1/16 W, 1% KOA RK73H1JT1270F
2 C1 C2 47µF Cap, Tant, 7343, 47 µF, 35 V AVX TPSE476M035R0200
3 C3 C4 C5 0.1µF Cap, Cer, 0603, 0.1uF, Y5V, 25 V Murata GRM39Y5V104Z025AD
1 C6 3300pF Cap, Cer, 0603, 3300 pF, X7R, 50 V Murata GRM39X7R332K050AD
1 C7 100µF Cap, Tant, 7343, 100 µF, 20 V Kemet T491X107K020A5
1 D1 B230/A Diode, SMB, B230/A, 2A, Schottkey Diodes, Inc. B230/A
1 D2 LL4148 Diode, MELF, LL4148, Switch Diode Diodes, Inc. LL4148
1 L1 15µH Xfmr, 2P, SMT, 15uH, 2A Coiltronics UP2.8B150
1 U1 CS51413 IC, CS51413, 8P, SO, Switch Reg Ctrl. On-Semicond. CS51413
Schematic
Switching Power Supply
Figure 14: Power Supply Schematic