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L6713ATR 数据表(PDF) 49 Page - STMicroelectronics

部件名 L6713ATR
功能描述  2/3 phase controller with embedded drivers for Intel VR10, VR11 and AMD 6 bit CPUs
PDF  64 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L6713ATR 数据表(HTML) 49 Page - STMicroelectronics

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L6713A
Over current protection
49/64
18
Over current protection
The device limits the total delivered current turning OFF all the MOSFETs as soon as the
delivery current is higher than an adjustable thresholds.This condition is lathed and power
supply or OUTEN pin cycling is required to restart operations.
The device sources a copy of IDROOP current from the OCSET pin: connecting a resistor
ROCP between OCSET pin and SGND the voltage at the OCSET pin depends on the total
delivery output current, as shown in the following relationships:
Figure 23.
OCP connections (left) and waveforms (right)
As soon as the OCSET pin voltage is higher than the internal fixed thresholds VOCTH (1.24 V
TYP, See Table 5), the device turns OFF all the MOSFETs and latches the condition.
The OCP threshold can be easily programmed through the ROCP resistor:
The output over current threshold has to be programmed, by designing the ROCP resistors,
to a safe value, in order to be sure that the device doesn't enter OCP during normal
operation of the device. This value must take into consideration also the extra current
needed during the dynamic VID transition ID-VID and, since the device reads across inductor
DCR, the process spread and temperature variations of these sensing elements.
Moreover, since also the internal threshold spreads, the ROCP design has to consider the
minimum value VOCTH(min) of the threshold as follow:
where IOUT(OCP) is the total delivery current for the over current condition and it must be
calculated considering the maximum delivery current and ID-VID (when D-VID are
implemented):
When it is necessary, filter OCSET pin to introduce a small delay in the over current
intervention.
V
OCSET
R
OCP
I
DROOP
⋅
R
OCP
DCR
R
G
------------- I
OUT
⋅⋅
==
OCP
COMPARATOR
I
DROOP
ROCP
OCSET
COCP
VOCTH=1.240V
UGATE
LGATE
OCSET
VOUT
R
OCP
R
G
DCR
-------------
V
OCTH
I
OUT OCP
()
---------------------------
⋅
=
R
OCP
R
G
DCR max
()
------------------------------
V
OCTH min
()
I
OUT OCP
()
----------------------------------
⋅
=
I
OUT OCP
()
I
OUT
MAX
I
DVID
–
+
>



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