L6706 datasheet(27/47 Pages) STMICROELECTRONICS

27 / 47 page

L6706

Load transient boost technology

Doc ID 15698 Rev 2

27/47

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Gain design. Through the LTBGAIN pin it is possible to modify the slope of the LTB

Ramp in order to modulate the entity of the LTB response once the LT has been

detected. In fact, the response depends on the board design and its parasites requiring

different actions from the controller.

Connect RLTBGAIN to SGND using the following relationship in order to select the

default value (slope of the LTB ramp equal to 1/2 of the OSC ramp slope).

Where FSW is the selected switching frequency (in kHz).

LTB Technology™ design tips.

–

Decrease RLTB to increase the system sensitivity making the system sensitive to

smaller dVOUT.

–

Increase CLTB to increase the system sensitivity making the system sensitive to

higher dV/dt.

–

Decrease RLTBGAIN to decrease the width of the LTB pulse reducing the system

ring-back or vice versa.

Figure 11.

LTB connection (left) and waveform (right)

LTBGAIN kΩ

[]

2 1240 10

⋅⋅

Fsw kHz

[] 200

–

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

⎝⎠

⎛⎞

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

LTB

To VCC_Core

RLTB

CLTB

L6706 Datasheet(PDF) 27 Page - STMicroelectronics