L6711TR STMicroelectronics, L6711TR Datasheet - Page 24

• 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
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Voltage positioning
Output voltage positioning is performed by selecting the reference DAC and by
programming the different contributors to the I
sourced from the FB pin, causes the output voltage to vary according to the external R
resistor: this allows programming precise output voltage variations depending on the
sensed current (Droop Function) as well as offsets for the regulation.
The three contributors to the I
Moreover, the embedded Remote Buffer allows to precisely programming the output voltage
offsets and variations by recovering the voltage drops across distribution lines.
The output voltage is then driven by the following relationship (I
setting):
Figure 9.
Droop function
Droop function allows the device to satisfy the requirements of high performance
microprocessors, reducing the size and the cost of the output capacitor. This method
"recovers" part of the drop due to the output capacitor ESR in the load transient, introducing
a dependence of the output voltage on the load current: a static error proportional to the
output current causes the output voltage to vary according to the sensed current. As shown
in figure 4-right, the ESR drop is present in any case, but using the droop function the total
deviation of the output voltage is minimized.
The information about the total current delivered (I
Figure
current information flows only in this resistor because the compensation network between
FB and COMP has always a capacitor in series (C
then equal to:
Where VID is the reference programmed through VIDx and VID_SEL (Only the I
contribute to I
VID R
V
OUT
–
Droop Function (green);
Offset (red);
Integrated Temperature Compensation (fuchsia).
=
9): connecting a resistor between this pin and VSEN (i.e. the output voltage), the total
I
OFFSET
FB
VID R
I
I
FB
FB
FB
–
Voltage positioning and droop function
FB
=
FB
VID
I
DROOP
has been considered).
R
VID R
R
FB
F
I
DR OOP
–
COMP
C
F
FB
VSEN
I
D ROOP
FB
current value are:
64k
64k
FBR
(Remote Sense)
To Vcore
I
OFFSET
FBG
FB
–
I
TC
current (see
DROOP
F
V
V
V
, see
M AX
N OM
M IN
) is sourced from the FB pin (see
Figure
Figure
RESPONSE W ITH OU T D ROOP
RESPONSE WITH D ROO P
OFFSET
ESR DROP
9). The voltage regulated is
9). This current,
sign depends on TC
DROOP
L6711
FB