L6714 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
L6714
STMicroelectronics
'L6714' PDF : 70 Pages View PDF
Over current protection
L6714
in this particular situation, the switching frequency for each phase results reduced. The ON
time is the maximum allowed TON(max) while the OFF time depends on the application:
TOFF = L ⋅
-I-P----E---A----K----–-----I--O----C----P---x-
VOUT
f = ---------------------1-----------------------
TON(max) + TOFF
Figure 20. Constant current
IPEAK
IMAX
IOCPx
TON(max)
LS ON Skipping
Clock Cycles
TON(max)
TSW
TSW
VOUT
0.40 VIN
Constant Current (Exploded)
Droop Effect
Limted-TON Char.
Resulting Out. Char.
UVP Threshold
IOCP = 4 x IOCPx
(IDROOP = 140µA)
IOUT
IMAX,tot
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.
Rg = I--O----C----P----x--(--m----a---x---)---⋅------R----S----E---N----S----E---(--m----a---x---)
IOCTH(min)
where
IOCPx
=
I--O----U----T---(--O----C----P---) – -∆----I-P----P- + I--D-----–---V----I-D--
N
2
N
52/70
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