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LTC3839 Datasheet(PDF) 6 Page - Linear Technology |
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LTC3839 Datasheet(HTML) 6 Page - Linear Technology |
6 / 50 page LTC3839 6 3839fa TYPICAL PERFORMANCE CHARACTERISTICS Phase Relationship: PHASMD = Ground Phase Relationship: PHASMD = Float Phase Relationship: PHASMD = INTVCC Overcurrent Protection Regular Soft Start-Up Short-Circuit Protection Soft Start-Up Into Pre-Biased Output Overvoltage Protection Output Tracking VOUT 100mV/DIV AC-COUPLED 5ms/DIV 3839 G12 VIN = 12V VOUT = 1.2V FORCED CONTINUOUS MODE IL 5A/DIV FULL CURRENT LIMIT WHEN VOUT HIGHER THAN HALF OF REGULATED VOUT 1V/DIV SHORT- CIRCUIT TRIGGER 500μs/DIV 3839 G13 VIN = 12V VOUT = 1.2V ILOAD = 0A IL 10A/DIV COUT RECHARGE CURRENT LIMIT STARTS TO FOLD BACK AS VOUT DROPS BELOW HALF OF REGULATED VOUT 100mV/DIV AC-COUPLED 20μs/DIV 3839 G14 VIN = 12V VOUT = 1.2V FORCED CONTINUOUS MODE ILOAD = 0A BG STAYS ON UNTIL VOUT IS PULLED BELOW OVERVOLTAGE THRESHOLD IL 10A/DIV BG1 5V/DIV OVERVOLTAGE CREATED BY APPLYING A CHARGED CAPACITOR TO VOUT 500ns/DIV 60° 0° 3839 G15 FIGURE 13 CIRCUIT VIN = 12V LOAD = 0A MODE/PLLIN = 333kHz EXTERNAL CLOCK CLKOUT 5V/DIV SW2 10V/DIV SW1 10V/DIV PLLIN 5V/DIV 180° 500ns/DIV 0° 3839 G16 CLKOUT 5V/DIV SW2 10V/DIV SW1 10V/DIV PLLIN 5V/DIV 90° 180° FIGURE 13 CIRCUIT VIN = 12V LOAD = 0A MODE/PLLIN = 333kHz EXTERNAL CLOCK 500ns/DIV 0° 3839 G17 CLKOUT 5V/DIV SW2 10V/DIV SW1 10V/DIV PLLIN 5V/DIV 120° 240° FIGURE 13 CIRCUIT VIN = 12V LOAD = 0A MODE/PLLIN = 333kHz EXTERNAL CLOCK RUN 5V/DIV VOUT 500mV/DIV 1ms/DIV 3839 G09 CSS = 10nF VIN = 12V VOUT = 1.2V FORCED CONTINUOUS MODE TRACK/SS 200mV/DIV RUN 5V/DIV VOUT 500mV/DIV 1ms/DIV 3839 G10 CSS = 10nF VIN = 12V VOUT = 1.2V VOUT PRE-BIASED TO 0.75V TRACK/SS 200mV/DIV VOUT 500mV/DIV 10ms/DIV 3839 G11 VIN = 12V VOUT = 1.2V FORCED CONTINUOUS MODE TRACK/SS 200mV/DIV |
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