參數(shù)資料
型號(hào)： FAN5019MTCX_NL
廠商： FAIRCHILD SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 4000 kHz SWITCHING FREQ-MAX, PDSO28
封裝： LEAD FREE, TSSOP-28
文件頁數(shù)： 20/30頁
文件大?。?/td> 781K
代理商： FAN5019MTCX_NL
PRODUCT SPECIFICATION
FAN5019
REV. 1.0.7 1/5/04
27
Figure 10. Transient Setting Waveform
Since the FAN5019 turns off all of the phases (switches
inductors to ground), there is no ripple voltage present
during load release. Thus, you do not have to add headroom
for ripple, allowing your load release VTRANREL to be larger
than VTRAN1 by that amount and still be meeting spec. If
VTRAN1 and VTRANREL are less than the desired nal droop,
this implies that capacitors can be removed. When removing
capacitors, make sure to check the output ripple voltage as
well to make sure it is still within spec.
Layout and Component Placement
The following guidelines are recommended for optimal
performance of a switching regulator in a PC system.
Key layout issues are illustrated in Figure 11.
Figure 11. Layout Recommendations
General Recommendations
For good results, at least a four-layer PCB is
recommended. This should allow the needed versatility
for control circuitry interconnections with optimal
placement, power planes for ground, input, and output
power, and wide interconnection traces in the rest of the
power delivery current paths. Keep in mind that each
square unit of 1 ounce copper trace has a resistance of
~0.53 m
at room temperature.
Whenever high currents must be routed between PCB
layers, vias should be used liberally to create several
parallel current paths so that the resistance and inductance
introduced by these current paths is minimized and the via
current rating is not exceeded.
If critical signal lines (including the output voltage sense
lines of the FAN5019) must cross through power circuitry,
it is best if a signal ground plane can be interposed
between those signal lines and the traces of the power
circuitry to serves as a shield to minimize noise injection
into the signals..
An analog ground plane should be used both around and
under the FAN5019 for ground connections to the
components associated with the controller. This plane
should be tied to the nearest output decoupling capacitor
ground and should not tie to any other power circuitry to
prevent power currents from owing in it.
The components around the FAN5019 should be located
close to the controller with short traces. The most
important traces to keep short and away from other traces
are the FB and CSSUM pins.
The output capacitors should be connected as close as
possible to the load (or connector) that receives the power
(e.g., a microprocessor core). If the load is distributed, the
capacitors should also be distributed, and generally in
proportion to where the load tends to be more dynamic.
Power Circuitry
The switching power path should be routed on the PCB to
encompass the shortest possible length in order to
minimize radiated switching noise energy (i.e., EMI) and
conduction losses in the board. Failure to take proper
precautions often results in EMI problems for the entire
PC system as well as noise related operational problems
in the power converter control circuitry. The switching
power path is the loop formed by the current path through
the input capacitors and the power MOSFETs including
all interconnecting PCB traces and planes. The use of
short and wide interconnection traces is especially critical
in this path for two reasons: it minimizes the inductance in
the switching loop, which can cause high-energy ringing,
and it accommodates the high current demand with
minimal voltage loss. Avoid crossing any signal lines over
the switching power path loop, described below.
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