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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L6740LTR датащи(PDF) 40 Page - STMicroelectronics |
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L6740LTR датащи(HTML) 40 Page - STMicroelectronics |
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40 / 44 page  LTB technology™ L6740L 40/44 ● 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 parasitics 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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