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PM6652 数据表(PDF) 36 Page - STMicroelectronics

部件名 PM6652
功能描述  Single-phase controller for Intel MVP 6.5 render voltage regulator,
PDF  53 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

PM6652 数据表(HTML) 36 Page - STMicroelectronics

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Device description
PM6652
36/53
Doc ID 16867 Rev 5
If the current sourced by the IMONFB pin is greater than IMAX for more than 4 ms (typ.) the
average current limit fault is detected and the IC latches off: the MOS drivers are put in high
impedance and the internal discharge MOSFET is turned on (see
Figure 37). A COREON
or SVCC toggle is required in order to restart the device.
Every time the IMONFB pin current becomes lower than IMAX, the internal timer is reset (see
Figure 38); as a consequence the inductor current which can cause the average current limit
fault is given by:
Equation 16
In order to set the right average current limit threshold, the PM6652 internal parameters and
also external component accuracy must be considered.
A complete equation for the average current limit threshold worst case variation is:
Equation 17
assuming
δR
G/RG, the accuracy of RG, αIMAX<10%, the internal current reference error,
VIMON,off<1 mV the IMON maximum offset, GSNS the NTC thermal compensation network
attenuation (see
Equation 11),
δR
SNS/RSNS the inductor DCR or precision resistor accuracy
and
δG
SNS/GSNS the thermal compensation network gain error, due to NTC and others
resistors accuracy (see
Equation 25). If the thermal compensation network is not used
and/or the current sensing filter resistor value is higher than the suggested one (as
explained it
Section 8.7: Current sensing) the previous equation must be modified in order to
take into account the DCR thermal drift and current sensing additional offset.
DCR
G
MAX
L
AVCL
,
OUT
AVCL
R
R
I
I
I
i
⋅
≥
∆
−
=
Figure 37.
Average current limit - recovery
Figure 38.
Average current limit detected
()
⎟⎟⎠
⎞
⎜⎜⎝
⎛ δ
+
⎟⎟⎠
⎞
⎜⎜⎝
⎛ δ
+
⎟⎟⎠
⎞
⎜⎜⎝
⎛
⋅
⋅
+
α
+
⎟⎟⎠
⎞
⎜⎜⎝
⎛ δ
=
δ
SNS
SNS
SNS
SNS
AVCL
SNS
SNS
off
,
IMON
IMAX
G
G
AVCL
WC
,
AVCL
G
G
R
R
I
R
G
V
R
R
I
I



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