L6711TR STMicroelectronics, L6711TR Datasheet - Page 26

• Manufacturer Part Number: L6711TR
• Description: IC CTRLR 3PHASE VID/DACS 48-TQFP
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of L6711TR

• Internal Switch(s): No
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 0.8 ~ 1.55 V
• Current - Output: 2A
• Frequency - Switching: 150kHz
• Voltage - Input: 12V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 48-TQFP Exposed Pad, 48-eTQFP, 48-HTQFP, 48-VQFP
• Power - Output: 2.5W
• Output Voltage: 0.8 V to 1.581 V
• Output Current: 95 A
• Input Voltage: 13.8 V
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-5363-2; L6711TR

Voltage positioning
10.3
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Offset resistor can be designed by considering the following relationship (R
Droop effect):
Offset automatically given by the DAC selection or by VID5 when VID_SEL=SGND differs
from the offset implemented through the OFFSET pin: the built-in feature is trimmed in
production and assures ±0.5% error (±0.6% for the Hammer DAC) over load and line
variations while implementing the same offset through the OFFSET pin causes additional
errors to be considered in the total output voltage precision.
When the Integrated Thermal Sensor is enabled (see
pin programs, in the same way as before, a negative offset. This is to compensate the
positive native offset introduced by the ITS. The effect of the programmed offset on the
output voltage results (I
Offset resistor is designed to compensate the ITS native offset as described in the following
section.
The Offset function can be disabled by shorting the pin to SGND.
Figure 11. Voltage positioning with integrated thermal sensor
Integrated thermal sensor
Current sense elements have non-negligible temperature variations: considering either
inductor or LS mosfet sense, the sensing elements modify proportionally to varying
temperature. As a consequence, the sensed current is subjected to a measurement error
that causes the regulated voltage to vary accordingly.
To recover from this temperature related error, a temperature compensation circuit is
integrated into the controller: the internal temperature is sensed and the droop current is
corrected (according to a scaling external resistor R
regulated voltage.
R
V
OUT
OFFSET
=
V
TC
VID R
=A+B·(T
=
TC
1.240V
------------------ - R
–
V
J
-25)
R
OS
TC
FB
I
OFFSET
1.240V
FB
OFFSET
=
OFFSET
VID R
is now added to I
1:1
–
R
OFFSET
FB
I
1:1
OFFSET
⎛
------------------------
R
I
OFFSET
FB
1.240
FB
FB
VID
I
DROOP
⎞
⎠
R
and no more subtracted as before):
F
TC
=
Figure 11
) in order to keep constant the
VID V
R
FB
COMP
C
F
–
OS
VSEN
and following section), the
64k
64k
FB
FBR
(Remote Sense)
To Vcore
is fixed by the
FBG
L6711