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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LT1776CS8 датащи(PDF) 6 Page - Linear Technology |
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LT1776CS8 датащи(HTML) 6 Page - Linear Technology |
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6 / 20 page  6 LT1776 10% and 90% duty cycle. The sync function is internally disabled if the FB pin voltage is low enough to cause oscillator slowdown. If unused, this pin should be grounded. FB (Pin 7): This is the inverting input to the feedback amplifier. The noninverting input of this amplifier is inter- nally tied to the 1.24V reference. This pin also slows down the frequency of the internal oscillator when its voltage is PIN FUNCTIONS abnormally low, e.g., 2/3 of normal or less. This feature helps maintain proper short-circuit protection. VC (Pin 8): This is the control voltage pin which is the output of the feedback amplifier and the input of the current comparator. Frequency compensation of the over- all loop is effected by placing a capacitor, (or in most cases a series RC combination) between this node and ground. BLOCK DIAGRA SWDR SWDR SWON SWON BOOST 1776 BD BOOST SWOFF SWOFF LOGIC OSC BIAS VTH VB VBG VBG FB VC GND SYNC SHDN VCC FB AMP BOOST COMP gm I I I I R1 RSENSE I COMP Q4 Q3 Q2 Q1 Q5 VSW D1 VIN 5 3 2 1 6 4 8 7 |
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