参数资料
型号: L6740L
厂商: STMICROELECTRONICS
元件分类: 模拟信号调理
英文描述: SPECIALTY ANALOG CIRCUIT, PQFP48
封装: 7 X 7 MM, 1 MM HEIGHT, HTQFP-48
文件页数: 35/44页
文件大小: 755K
代理商: L6740L
LTB Technology
L6740L
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.
Leaving the LTBGAIN pin floating, the maximum pulse-width is programmed. The slope
of the LTB ramp will be equal to 1/2 of the OSC ramp slope.
Connecting RLTBGAIN to GND, the LTB Ramp slope can be modified as follow:
Where ILTBGAIN is the current sunk from LTBGAIN pin and IOSC is the OSC current
(20
μA plus the current sunk from the OSC pin).
LTB TechnologyTM 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.
Increase RLTBGAIN to increase the width of the LTB pulse reducing the system
ring-back.
LTBRamp
Slope
OSC
Slope
1
I
LTBGAIN
I
OSC
------------------------
+
=
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