L6711TR STMicroelectronics, L6711TR Datasheet - Page 33

• 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

L6711
14
14.1
14.2
14.3
Output voltage monitor and protections
The device monitors through pin VSEN the regulated voltage in order to manage the OVP /
UVP conditions.
UVP protection
If the output voltage monitored by VSEN drops below the 60% of the reference voltage for
more than one clock period, the device turns off all mosfets and the OSC/FAULT is driven
high (5V). The condition is latched; to recover it is required to cycle Vcc or the OUTEN pin.
Programmable OVP protection
Once VCC crosses the turn-ON threshold and the device is enabled (OUTEN = 1), the
device provides a programmable Over Voltage protection; when the voltage sensed
overcomes the programmed threshold, the controller permanently switches on all the low-
side mosfets and switches off all the high-side mosfets in order to protect the load. The
OSC/ FAULT pin is driven high (5V) and power supply or OUTEN pin cycling is required to
restart operations.
The OVP threshold is programmed through the OVP pin: leaving the pin floating, it is
internally pulled-up and the threshold is set at 115% (Typ.) of the programmed output
voltage. Connecting the OVP pin to SGND through a resistor R
becomes a fixed voltage as follow:
O
Preliminary OVP protection (Pre-OVP)
While VCC pin is under the turn-ON threshold, a preliminary-OVP protection turns on the
low side mosfets as long as the FBR pin voltage is greater than 1.8V. This protection is
enabled when VCC stays within the device turn-on threshold and the PreOVP turn on
threshold and depends also on the OUTEN pin status as detailed in
A simple way to provide protection to the output in all conditions when the device is OFF
(then avoiding the unprotected red region in
through the 5V
Both Over Voltage and Under Voltage are active also during soft start (see the relevant
section).
VPTH
= 1.455 · R
SB
bus as shown in
OVP
· 12.5
Figure 16 - right.
Figure
Output voltage monitor and protections
16) consists in supplying the controller
OVP
, the OVP threshold
Figure 16 -
left.
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