L6714 STMicroelectronics, L6714 Datasheet - Page 52

• 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

Over current protection
52/70
in this particular situation, the switching frequency for each phase results reduced. The ON
time is the maximum allowed T
Figure 20. Constant current
The trans-conductance resistor Rg can be designed considering that the device limits the
bottom of the inductor current ripple and also considering the additional current delivered
during the quasi-constant-current behavior as previously described in the worst case
conditions.
Moreover, when designing D-VID compatible systems, the additional current due to the
output filter charge during dynamic VID transitions must be considered.
where
I
I
PEAK
OCPx
I
MAX
T
ON(max)
T
SW
LS ON Skipping
Clock Cycles
T
OFF
Rg
=
I
OCPx
=
L
T
I
-----------------------------------------------------------------------
OCPx max
ON(max)
ON(max)
I
------------------------------------
PEAK
=
T
I
-------------------------- -
V
SW
OUT OCP
OUT
I
–
OCTH min
N
while the OFF time depends on the application:
I
OCPx
R
SENSE max
–
----------- -
I
2
PP
+
I
----------------- -
f
D VID
=
–
N
-------------------------------------------- -
T
ON max
0.40 V
V
OUT
IN
1
(I
I
DROOP
OCP
+
T
Constant Current (Exploded)
Limted-T
Resulting Out. Char.
UVP Threshold
OFF
= 4 x I
= 140 A)
OCPx
ON
Char.
Droop Effect
I
MAX,tot
L6714
I
OUT