RT8841 데이터 시트보기 (PDF) - Richtek Technology

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RT8841

4/3/2/1-Phase PWM Controller for High-Density Power Supply

Richtek Technology 

 The voltage feedback loop contains two traces, VCC

and VSS, which are Kelvin sensed from CPU socket or

output capacitors. These two traces are suggested above

10mil width and put away from high (di/dt) switching

elements such as high side MOSFETs, low side

MOSFETs, phase plane etc. The circuit elements of

voltage feedback loop, such as feedback loop short

resistors and voltage loop compensation RCs, have to

be kept near the RT8841 and also away from switching

elements.

 The current sense mechanism of the RT8841 is fully

differential Kelvin sense. Therefore, the current sense

loops of the RT8841 contain two traces : the positive

traces(ISP1 to ISP4) come from the positive node of

output inductors(the node connecting phase plane) and

the negative traces (ISN1 to ISN4) come from the

negative node of output inductors(the node connecting

output plane).

DO NOT connect the current sense traces from phase

plane or output plane. Only connect these traces from

both sides of output inductors can achieve the goal of

precise Kelvin sense. The current sense feedback loops

have to be routed away from switching elements, and

the current sense RC elements have to be put near

their respective ISN or ISP pins of the RT8841 and also

away from noise switching elements. At least 10 mil

width is suggested for current sense feedback loops.

RT8841

Copyright ©2014 Richtek Technology Corporation. All rights reserved.

DS8841-02 August 2014

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

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