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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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LT1952IGN Datenblatt(PDF) 9 Page - Linear Technology |
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LT1952IGN Datenblatt(HTML) 9 Page - Linear Technology |
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9 / 24 page  LT1952 9 1952f BLOCK DIAGRA TI I G DIAGRA VREF >90% – + SOURCE 2.5mA 2.5V 1.23V (100 TO 500)kHz OSC (TYPICAL 200kHz) IHYST 11µA SD_VSEC = 1.32V 0µA SD_VSEC > 1.32V 7 5 14 13 6 3 4 10 8 1 9 2 SD_VSEC ROSC SYNC 1.32V 1.23V ADAPTIVE MAXIMUM DUTY CYCLE CLAMP (LINEAR) SLOPE COMP 8µA 0% DC 35µA 80% DC RAMP S Q R R Q S BLANK FB COMP GND BLANK 12 DELAY VREF 15 VIN SS_MAXDC SOFT-START CONTROL OVER CURRENT SENSE CURRENT OUT 16 SOUT PGND ISENSE 11 OC DRIVER ±1A ±50mA 12V 13V 0.45V 1952 BD – + (VOLTAGE) ERROR AMPLIFIER 100mV 0mV TO 220mV ON DELAY 14.25V ON 8.75V OFF 460µA START-UP INPUT CURRENT – + Figure 2. Block Diagram 1952 F01 tDELAY: PROGRAMMABLE SYNCHRONOUS DELAY FAULTS TRIGGERING SOFT-START VIN < 8.75V OR SD_VSEC < 1.32V (UVLO) OR OC > 100mV (OVER-CURRENT) SOFT-START LATCH RESET: VIN > 14.25V (> 8.75V IF LATCH SET BY OC) AND SD_VSEC > 1.32V AND OC < 100mV AND SS_MAXDC < 0.45V SOFT-START LATCH SET SOUT OUT SS_MAXDC 0.8V (ACTIVE THRESHOLD) 0.45V (RESET THRESHOLD) 0.2V Figure 1. Timing Diagram |
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