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UCC39421 Datasheet(PDF) 8 Page - Texas Instruments |
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UCC39421 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 35 page UCC29421, UCC29422, UCC39421, UCC39422 MULTIMODE HIGHFREQUENCY PWM CONTROLLER SLUS246C − OCTOBER 1999 − REVISED FEBRUARY 2005 8 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION power saving modes (continued) UDG−98107 7 9 8 3 2 4 6 12 5 17 11 20 18 16 19 13 14 15 1 10 + 1.24 V + RESET/POR + UCC29422 ONLY 1.18 V + 0.2 V 1.22 + + Q S R + + 70 mV PFM 1=SLEEP 1.24 V 0.6 V + 1.24 V VREF SLOPECOMP + PWM OSC VDD CONTROL VPUMP VOUT 1.2 V + S R Q Q Q R S 2.5 µS MUX A B A/B + + PFM DISABLE COMP ERROR AMP PWM COMP 1 = LP_MODE ILIM COMP LEB 0.3 V 30 MHz AMP + X10 0.15 V VOUT>2.5 V VPUMP >2.5 V Q Q R S START−UP 36 mV ANTI− CROSS COND. VPUMP 1=SD VIN VOUT+2 V VIN IZERO PGND PUMP SWITCH CONTROL VIN VGD CLK SYNC/SD RT GND LOWBAT VDET RSADJ PFM COMP FB PGND ISENSE CHRG RSEL RECT RSEN VOUT CP VIN VPUMP VDD BIAS CONTROL AND UVLO VDD ADAPTIVE ZERO CURRENT SENSING 10%−20% OF FULL LOAD = LP_MODE 85% DMAX VGD RESET VIN + PFM COMP + 20 µs DELAY Figure 2. Detailed Block Diagram |
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