L6713ATR datasheet(37/64 Pages) STMICROELECTRONICS

37 / 64 page

L6713A

Load transient boost technologyTM

37/64

Load transient boost technologyTM

Load transient boost LTB Technology™ (patent pending) is a L6713A feature to minimize

the count of output filter capacitors (MLCC and bulk capacitors) to respect the load transient

specifications.

The device turns on simultaneously all the phases as soon as a load transient is detected

and keep them on for the necessary time to supply the extra energy to the load. This time

depends on the COMP pin voltage and on a internal gain, in order to keep under control the

output voltage ring back.

Load transition is detected through LTB™ pin connecting a RLTB-CLTB vs. VOUT: the device

measures the derivate dV/dt of the output voltage and so it is able to turns on all the phases

immediately after a load transition detection, minimizing the delay intervention.

Modifying the RLTB-CLTB values the dV/dt can be easily programmed, extending the system

design flexibility

where dVOUT is the output voltage drop due to load transition.

Moreover, load transient boost LTB Technology™ gain can be easily modified in order to

keep under control the output voltage ring back.

Figure 12.

LTB connections (left) and waveform (right)

Short LTB pin to SGND to disable the LTB Technology™: in this condition the device works

as a dual-edge asynchronous PWM controller.

LTB

OUT

μA

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

LTB

π R

LTB

⋅⋅

⋅ ⋅

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

LTB

To VCC_Core

RLTB

CLTB

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