LM48580
www.ti.com
SNAS491A –FEBRUARY 2010–REVISED MAY 2013
Table 2. Recommended Inductors
MANUFACTURER
Taiyo Yuden
Coilcraft
PART#
BRL3225T4R7M
LP3015
INDUCTANCE/ISAT
4.7µH/1.1A
4.7µH/1.1A
Diode Selection
Use a Schottkey diode as shown in Figure 1. A 20V diode such as the NSR0520V2T1G from On Semiconductor
is recommended. The NSR0520V2T1G is designed to handle a maximum average current of 500mA.
PCB LAYOUT GUIDELINES
Minimize trace impedance of the power, ground and all output traces for optimum performance. Voltage loss due
to trace resistance between the LM48580 and the load results in decreased output power and efficiency. Trace
resistance between the power supply and ground has the same effect as a poorly regulated supply, increased
ripple and reduced peak output power. Use wide traces for power supply inputs and amplifier outputs to minimize
losses due to trace resistance, as well as route heat away from the device. Proper grounding improves audio
performance, minimizes crosstalk between channels and prevents switching noise from interfering with the audio
signal. Use of power and ground planes is recommended.
Place all digital components and route digital signal traces as far as possible from analog components and
traces. Do not run digital and analog traces in parallel on the same PCB layer. If digital and analog signal lines
must cross either over or under each other, ensure that they cross in a perpendicular fashion.
Demoboard Bill of Materials
Table 3. Demoboard Bill of Materials
DESIGNATOR
QUANTITY
DESCRIPTION
10µF ±10% 16V
C1
1
Tantalum Capacitor (B Case)
AVX TPSB106K016R0800
1µF ±10% 16V X5R
Ceramic Capacitor (603)
Panasonic ECJ-1VB1C105K
Murata GRM188R61C105KA93D
1µF ±10% 25V X5R
C2
C3
1
1
1
2
Ceramic Capacitor (603)
Panasonic ECJ-1VB1E105K
Murata GRM188R61E105KA12D
100pF ±5% 50V C0G
Ceramic Capacitor (603)
Panasonic ECJ-1VC1H101J
Murata GRM1885C1H101JA01D
4.7µF ±10% 10V X5R
C4
Ceramic Capacitor (603)
Panasonic ECJ-1VB1A474K
Murata GRM188R61A474KA61D
0.1µF ±10% 50V X7R
C5, C6
Ceramic Capacitor (603)
Panasonic ECJ-1VB1H104K
Murata GRM188R71H104KA93D
C7
C8
1
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