L6714 STMicroelectronics, L6714 Datasheet - Page 49

• Manufacturer Part Number: L6714
• Description: IC CTRLR 4PH W/DRIVERS 64-TQFP
• Manufacturer: STMicroelectronics

Specifications of L6714

• Applications: Controller, Intel VR10, VR11, AMD CPU
• Voltage - Input: 12V
• Number Of Outputs: 4
• 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
• Mounting Style: SMD/SMT
• Case: QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

L6714
17
Maximum Duty-cycle limitation
The device limits the maximum duty cycle and this value is not fixed but it depends on the
delivered current given by the following relationship:
From the previous relationships the maximum duty cycle results:
If the desired output characteristic crosses the limited-D
output resulting voltage will start to drop after the cross-point. In this case the output voltage
starts to decrease following the resulting characteristic (dotted in
detected or anyway until I
Figure 19. Maximum Duty-Cycle (left) and limited DMAX output voltage (right)
D
80 %
40 %
MAX
D
Maximum Duty Cycle
max
(I
I
OCP
DROOP
=
0.80
= N x I
= 140 A
DROOP
–
D
OCPx
I
DROOP
max
=140 A.
)
=
I
DROOP
2.857k
80%
40%
=
I
I
0.80 V
0.40 V
DROOP
DROOP
0.80
V
OUT
–
IN
IN
R
---------------------
=
=
MAX
SENSE
0 A
140 A
R
Maximum Duty-cycle limitation
g
Limited D
Limted-D
Desired output Char.
Resulting Output Char.
UVP Threshold
maximum output voltage, the
I
Figure
OUT
(I
I
OCP
DROOP
MAX
MAX
= N x I
2.857k
Output Char.
19) until UVP is
Output Voltage
= 140 A)
OCPx
I
49/70
OUT