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UC1845A Scheda tecnica(PDF) 8 Page - Texas Instruments

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Il numero della parte UC1845A
Spiegazioni elettronici  CURRENT-MODE PWM CONTROLLER
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
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UC1845A Scheda tecnica(HTML) 8 Page - Texas Instruments

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UC1842A-EP, UC1843A-EP, UC1844A-EP, UC1845A-EP
CURRENT-MODE PWM CONTROLLER
SGLS134B – SEPTEMBER 2002 – REVISED APRIL 2003
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
High peak currents associated with capacitive loads necessitate careful grounding techniques. Timing and bypass capacitors should be
connected close to pin 5 in a single point ground. The transistor and 5k potentiometer are used to sample the oscillator waveform and apply an
adjustable ramp to pin 3.
Figure 7. Open-Loop Laboratory Text Fixture
A fraction of the oscillator ramp can be resistively summed
with the current sense signal to provide slope compensation
for converters requiring duty cycles over 50%.
Note that capacitor, C, forms a filter with R2 to suppress the
leading edge switch spikes.
Figure 8. Slope Complression


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