L6713A STMicroelectronics, L6713A Datasheet - Page 54

• 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

Thermal monitor
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Thermal monitor
L6713A continuously senses the system temperature through TM pin: depending on the
voltage sensed by this pin, the device sets free the VR_FAN pin as a warning and, after
further temperature increase, also the VR_HOT pin as an alarm condition.
These signals can be used to give a boost to the system fan (VR_FAN) and improve the VR
cooling, or to initiate the CPU low power state (VR_HOT) in order to reduce the current
demand from the processor so reducing also the VR temperature. In a different manner,
VR_FAN can be used to initiate the CPU low power state so reducing the processor current
requirements and VR_HOT to reset the system in case of further dangerous temperature
increase.
Thermal sensors is external to the PWM control IC since the controller is normally not
located near the heat generating components: it is basically composed by a NTC resistor
and a proper biasing resistor R
system hot-spot in order to be sure to control the hottest point of the VR.
Typical connection is reported in
programmed by modifying the divider values in order to cross the VR_FAN and VR_HOT
thresholds at the desired temperatures.
Both VR_HOT and VR_FAN are active high and open drain outputs. Thermal Monitor
function is enabled if V
Figure 27. System thermal monitor typical connections
TM
(Place remotely, near Hot Spot)
Sense Element
R
TM
CC
>>UVLO
+5V
TM
Figure 27
. NTC must be connected as close as possible at the
VCC
.
4.00
3.80
3.60
3.40
3.20
3.00
2.80
2.60
2.40
2.20
2.00
80
that also shows how the trip point can be easily
85
TM Voltage - NTC=3300/4250K
90
Temperature [degC]
95
100
105
Rtm = 330
Rtm = 390
Rtm = 470
110
115
L6713A
120