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| 型號： | RT9241A |
| 文件頁數(shù)： | 14/18頁 |
| 文件大小： | 333K |
| 代理商： | RT9241A |
RT9241A/B
www.richtek.com
14
DS9241AB-01 October 2002
Layout Guide
Layout Guide
Place the high-power switching components first, and
separate them from sensitive nodes.
1. Most critical path: the current sense circuit is
the most sensitive part of the converter. The
current sense resistors tied to ISP1,2 and
ISN1,2, should be located not more than 0.5
inch from the IC and away from the noise
switching nodes. The PCB trace of sense
nodes should be parallel and as short as
possible. Kelvin connection of the sense
component (additional sense resistor or
MOSFET R
DS(ON)
) ensures the accurate stable
current sensing.
No Kelvin sense, no guarantee for stable
operation!
Switching ripple current path:
a. Input capacitor to high side MOSFET
b. Low side MOSFET to output capacitor
c. The return path of input and output capacitor
d. Separate the power and signal GND
e. The switching nodes(the connection node of
high/low side MOSFET and inductor) is the
most noisy points. Keep them away from
sensitive small-signal node.
f. Reduce parasitic R, L by minimum length,
enough copper thickness and avoiding of via.
2. MOSFET driver should be close to MOSFET
4.The compensation, bypass and other function
setting components should be near the IC and
away from the noisy power path.
V
SW1
L1
SW2
L2
R
IN
V
IN
C
IN
V
OUT
C
OUT
R
L
Fig.7 Power Stage Ripple Current Path
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