RT8113 RICHTEK [Richtek Technology Corporation], RT8113 Datasheet - Page 20

• Manufacturer Part Number: RT8113
• Description: Single Phase VR11.1 PWM Controller with 7-bit VID
• Manufacturer: RICHTEK [Richtek Technology Corporation]

RT8113
DO NOT connect the current-sense traces from the phase
plane or output plane. Only connect these traces from
both sides of the output inductor to 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 RT8113 and also away
from noise switching elements. At lease 10 mm width is
suggested for current sense feedback loops.
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20
The voltage feedback loop contains two traces, VCC
and VSS, which are Kelvin sensed from CPU socket or
output capacitors. These two traces should have 10mm
width and be placed 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 RT8113 and also away from switching
elements.
The current-sense mechanism of the RT8113 is fully
differential Kelvin sense. Therefore, the current-sense
loop of the RT8113 contain two traces : the positive
trace(ISP) comes from the positive node the of output
inductor (the node connecting phase plane) and the
negative trace (ISN) comes from the negative node of
the output inductor (the node connecting output plane).
DS8113-02 April 2011