L6701TR STMicroelectronics, L6701TR Datasheet - Page 25

• Manufacturer Part Number: L6701TR
• Description: IC CTRLR 3PH VR10/9/K8 PWRSSO-36
• Manufacturer: STMicroelectronics

Specifications of L6701TR

• Applications: Controller, Intel VR9, VR10, K8
• Voltage - Input: 12V
• Number Of Outputs: 3
• Voltage - Output: 0.8 ~ 1.85 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 36-PowerSOIC
• Output Voltage: 0.8 V to 1.85 V
• Output Current: 1.5 A
• Switching Frequency: 110 KHz
• 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: 497-6108-2

L6701
10.5
Maximum Duty Cycle limitation
To provide proper time for current-reading in order to equalize the current carried by each
phase, the device implements a duty-cycle limitation. This limitation is not fixed but it is linearly
variable with the current delivered to the load as follow:
Duty Cycle limitation is variable with the delivered current to provide fast load transient
response at light load as well as assuring robust over-current protection.
Figure 10
T
the limited-T
cross-point. In this case, the output voltage starts to decrease following the resulting
characteristic (dotted in
Figure 10. Maximum Duty Cycle limitation
ON
limitation imposed by the previous relationship. If the desired output characteristic crosses
0.80 V
0.40 V
V
OUT
shows the maximum output voltage that the device is able to regulate considering the
IN
IN
ON
maximum output voltage, the output resulting voltage will start to drop after the
Limted-T
Maximum Output Voltage
Figure
I
(I
OCP
ON
T
ISENx
ON max
Output Char.
= 3 x I
(
10) until UVP is detected or anyway until I
= 35µA)
)
OCPx
=
⎧
⎨
0.80 T
0.40 T
I
OUT
⋅
⋅
0.80 V
0.40 V
SW
SW
V
OUT
IN
IN
I
I
ISENx
ISENx
Limted-T
Desired output Char.
Resulting Output Char.
UVP Threshold
=
=
0µA
35µA
I
Limited T
OCP
(I
ON
ISENx
10 Output Voltage Positioning
Output Char.
= 3 x I
= 35µA)
ISENx
ON
OCPx
= 35µA.
I
OUT
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