L6714 datasheet(52/70 Pages) STMICROELECTRONICS

Il numero della parte	L6714

Spiegazioni elettronici	4 phase controller with embedded drivers for Intel VR10, VR11 and AMD 6Bit CPUs

PDF	70 Pages

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

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52 / 70 page

Over current protection

L6714

52/70

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:

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

OFF

PEAK

OCPx

–

OUT

------------------------------------

⋅

ON max

()

OFF

---------------------------------------------

VOUT

0.40 VIN

Constant Current (Exploded)

IOCP = 4 x IOCPx

(IDROOP = 140µA)

IOUT

UVP Threshold

Resulting Out. Char.

IMAX,tot

Limted-TON Char.

Droop Effect

TON(max)

IOCPx

IMAX

IPEAK

LS ON Skipping

Clock Cycles

TSW

OCPx max

()

SENSE max

()

⋅

OCTH min

()

-----------------------------------------------------------------------

OCPx

OUT OCP

()

---------------------------

∆I

------------

DVID

–

------------------

–

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