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RT9205APS датащи(PDF) 14 Page - Richtek Technology Corporation

номер детали RT9205APS
подробное описание детали  Dual Regulators - Synchronous Buck PWM DC-DC and Linear Controller
PDF  15 Pages
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производитель  RICHTEK [Richtek Technology Corporation]
домашняя страница  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9205APS датащи(HTML) 14 Page - Richtek Technology Corporation

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RT9205/A
Preliminary
14
DS9205/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
represent 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 islands 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
RT9205/A
FB
LGATE
UGATE
IL
IQ1
V
OUT
Q2
Q1
IQ2
5V
GND



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