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RT9204GS датащи(PDF) 13 Page - Richtek Technology Corporation

номер детали RT9204GS
подробное описание детали  Dual Regulators - Standard Buck PWM DC-DC and Linear Controller
PDF  14 Pages
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производитель  RICHTEK [Richtek Technology Corporation]
домашняя страница  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9204GS датащи(HTML) 13 Page - Richtek Technology Corporation

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RT9204/A
Preliminary
13
DS9204/A-08 March 2007
www.richtek.com
The power components and the PWM controller should
be placed firstly. Place the input capacitors, especially the
high-frequency ceramic decoupling capacitors, close to
the power switches. Place the output inductor and output
capacitors between the MOSFETs and the load. Also
locate the PWM controller near by MOSFETs.
A multi-layer printed circuit board is recommended. Figure
13. shows the connections of the critical components in
the converter. Note that the capacitors CIN and COUT
each of them represents numerous physical capacitors.
Use a dedicated grounding plane and use vias to ground
all critical components to this layer. Apply another solid
layer as a power plane and cut this plane into smaller
islands of common voltage levels. The power plane should
support the input power and output power nodes. Use
copper filled polygons on the top and bottom circuit layers
for the PHASE node, but it is not necessary to oversize
this particular island. Since the PHASE node is subjected
to very high dV/dt voltages, the stray capacitance formed
between these island and the surrounding circuitry will
tend to couple switching noise. Use the remaining printed
circuit layers for small signal routing. The PCB traces
between the PWM controller and the gate of MOSFET
and also the traces connecting source of MOSFETs
should be sized to carry 2A peak currents.
Figure 13
LOAD
VCC
GND
RT9204/A
FB
UGATE
IL
IQ1
V
OUT
Q1
IQ2
5V
GND



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