L6711TR STMicroelectronics, L6711TR Datasheet - Page 34

• 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

Output voltage monitor and protections
14.4
34/50
Figure 16. Output voltage protections and typical principle connections to assure
Over current
Depending on the current reading method selected, the device limits the peak or the bottom
of the inductor current entering in constant current until setting UVP as below explained.
The Over Current threshold has to be programmed, by designing the Rg 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 I
DCR, the process spread and temperature variations of these sensing elements.
Moreover, since also the internal threshold spreads, the Rg design must consider its
minimum value I
where I
Quasi Constant Current (LS Mosfet Sense) or Constant Current (Inductor Sense), I
must be calculated starting from the corresponding output current value I
(I
where I
Current (LS Mosfet Sense) or Constant Current (Inductor Sense), I
ripple in each phase and I
In particular, since the device limits the peak or the valley of the inductor current (according
to CS_SEL status), the ripple entity, when not negligible, impacts on the real OC threshold
value and must be considered.
Rg
I
OCPx
D-VID
PreOVP TurnON
=
I
-------------------------------------------------------------------- -
=
Vcc TurnON
OCPx max
must also be considered when D-VID are implemented):
OCP
OUT(OCP)
⎧
⎪
⎪
⎨
⎪
⎪
⎩
I
-------------------------- -
I
-------------------------- -
OUT OCP
OUT OCP
x is the current measured by the current reading circuitry when the device enters
complete protection.
I
V cc
OC TH min
3
3
OCTH(min)
is still the output current value at which the device enters Quasi Constant
R
Preliminary OVP
FBR Monitored
(OUTEN = 0)
SENSE max
–
+
---------- -
---------- -
I
2
I
2
pp
pp
Preliminary OVP Enabled
D-VID
D-VID
as follow:
+
+
FBR Monitored
No Protection
I
-------------- Low Side Mosfet Sense
I
-------------- Inductor DCR Sense
D -VID
D-VID
Provided
3
3
and, since the device reads across mosfets R
is the additional current required by D-VID (when applicable).
Programmable OVP
VSEN Monitored
(OUTEN = 1)
+5V
+12V
SB
PP
is the inductor current
OUT(OCP)
VCC
VCCDR1
VCCDR2
VCCDR3
dsON
or inductor
as follow
OCPx
L6711