L6713A STMicroelectronics, L6713A Datasheet - Page 49

• Manufacturer Part Number: L6713A
• Description: IC CTRLR 2/3PH W/DRIVERS 64-TQFP
• Manufacturer: STMicroelectronics

Specifications of L6713A

• Applications: Controller, Intel VR10, VR11, AMD CPU
• Voltage - Input: 12V
• Number Of Outputs: 3
• Voltage - Output: 0.3 ~ 1.6 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 64-TQFP Exposed Pad, 64-eTQFP, 64-HTQFP, 64-VQFP
• Output Current: 2 A
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

L6713A
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 I
R
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 V
TYP,
The OCP threshold can be easily programmed through the R
The output over current threshold has to be programmed, by designing the R
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 I
DCR, the process spread and temperature variations of these sensing elements.
Moreover, since also the internal threshold spreads, the R
minimum value V
where I
calculated considering the maximum delivery current and I
implemented):
When it is necessary, filter OCSET pin to introduce a small delay in the over current
intervention.
OCP
COMPARATOR
See Table
between OCSET pin and SGND the voltage at the OCSET pin depends on the total
OCP
OUT(OCP)
V
OCTH
5), the device turns OFF all the MOSFETs and latches the condition.
is the total delivery current for the over current condition and it must be
OCTH(min)
=1.240V
I
DROOP
V
OCSET
of the threshold as follow:
R
OCSET
DROOP
OCP
=
I
OUT OCP
R
R
R
OCP
OCP
OCP
=
(
current from the OCSET pin: connecting a resistor
------------------------------
DCR max
⋅
=
I
)
DROOP
R
>
------------ -
DCR
D-VID
(
R
G
I
OUT
G
C
⋅
OCP
and, since the device reads across inductor
)
MAX
-------------------------- -
I
=
OUT OCP
⋅
V
V
--------------------------------- -
R
OCTH
I
OCTH
OUT OCP
+
OCP
(
I
D VID
–
(
⋅
(
)
min
DCR
------------ - I
OCP
VOUT
D-VID
R
G
)
OCP
)
design has to consider the
⋅
(when D-VID are
OUT
resistor:
Over current protection
LGATE
OCSET
UGATE
OCP
OCTH
resistors,
(1.24 V
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