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參數(shù)資料
| 型號： | RT9206 |
| 英文描述： | Step-down DC/DC Converter |
| 中文描述： | 降壓直流/直流轉(zhuǎn)換器 |
| 文件頁數(shù)： | 14/16頁 |
| 文件大?。?/td> | 315K |
| 代理商： | RT9206 |
RT9203/A
output inductor and output capacitors between the
MOSFETs and the load. Also locate the PWM
controller near by MOSFETs.
Preliminary
www.richtek.com
14
DS9203/A-04 May 2003
A multi-layer printed circuit board is recommended.
Fig.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.
Fig. 13
+
+
+
LOAD
RT9203/A
VCC
GND
FB
LGATE
UGATE
V
OUT
IQ1
IL
Q1
Q2
IQ2
5V
GND
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