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LM3544MX-H 데이터시트(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 LM3544MX-H
상세설명  Quad Port USB Power Distribution Switch and Over-Current Protection
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3544MX-H 데이터시트(HTML) 10 Page - National Semiconductor (TI)

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Application Information (Continued)
tantalum capacitor is recommended. The input supply
should be further bypassed with a 0.01 µF - 0.1 µF ceramic
capacitor, placed close to the device. The ceramic capacitor
reduces ringing on the supply that can occur when a short is
present at the output of a port.
Extending the Fault Flag Delay
While the 7 ms (typical) internal delay in reporting flag
conditions is adequate for most applications, the delay can
be extended by connecting external RC filters to the FLAG
pins, as shown in
Figure 5.
Power Dissipation and Junction Temperature
A few simple calculations will allow a designer to calculate
the approximate operating temperature of the LM3544 for a
given application. The large currents possible through the
low resistance power MOSFET combined with the high
thermal resistance of the SOIC package, in relation to power
packages, make this estimate an important design step.
Begin the estimate by determining R
ON at the expected
operating temperature using the graphs in the Typical
Performance Characteristics section of this datasheet. Next,
calculate the power dissipation through the switch with
Equation (1).
PD=R
ON * IDS
2
(1)
Note: Equation for power dissipation neglects portion that
comes from LM3544 quiescent current because this value
will almost always be insignificant.
Using this figure, determine the junction temperature with
Equation (2).
T
J =PD * θJA +TA.
(2)
Where:
θ
JA = SOIC Thermal Resistance: 130˚C/W and TA = Ambient
Temperature (˚C).
Compare the calculated temperature with the expected
temperature used to estimate R
ON. If they do not reasonably
match, re-estimate R
ON using a more appropriate operating
temperature and repeat the calculations. Reiterate as
necessary.
PCB Layout Considerations
In order to meet the USB requirements for voltage drop,
droop and EMI, each component used in this circuit must be
evaluated for its contribution to the circuit performance.
These principles are illustrated in
Figure 6. The following
PCB layout rules and guidelines are recommended
1.
Place the switch as close to the USB connector as
possible. Keep all V
bus traces as short as possible and
use at least 50-mil, 1 ounce copper for all V
bus traces.
Solder plating the traces will reduce the trace resistance.
2.
Avoid vias as much as possible. If vias are used, use
multiple vias in parallel and/or make them as large as
possible.
3.
Place the output capacitor and ferrite beads as close to
the USB connector as possible.
4.
If ferrite beads are used, use wires with minimum
resistance and large solder pads to minimize connection
resistance.
10120828
FIGURE 5. Typical Circuit for Lengthening the Internal
Flag Delay
10120827
FIGURE 6. Self-Powered Hub Connections and Per-Port Voltage Drop
www.national.com
10


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