l6706 STMicroelectronics, l6706 Datasheet - Page 27

• Manufacturer Part Number: l6706
• Description: Vr11.1 Single Phase Controller With Integrated Driver
• Manufacturer: STMicroelectronics

L6706
●
LTB Technology™ design tips.
Figure 11. LTB connection (left) and waveform (right)
LTB
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 R
default value (slope of the LTB ramp equal to 1/2 of the OSC ramp slope).
Where F
–
–
–
Decrease R
smaller dV
Increase C
higher dV/dt.
Decrease R
ring-back or vice versa.
SW
R
LTBGAIN
LTB
is the selected switching frequency (in kHz).
OUT
LTB
LTB
LTBGAIN
C
to SGND using the following relationship in order to select the
.
to increase the system sensitivity making the system sensitive to
LTB
to increase the system sensitivity making the system sensitive to
R
LTBGAIN
to decrease the width of the LTB pulse reducing the system
Doc ID 15698 Rev 1
To VCC_Core
[
kΩ
]
=
------------------------------------------------------------------- -
20
+
⎛
⎝
2 1240 10
Fsw kHz
------------------------------------------- -
⋅
[
10
⋅
Load transient boost technology
] 200
–
3
⎞
⎠
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