Datasheet LTC3839 (Analog Devices) - 6
| 制造商 | Analog Devices |
| 描述 | Fast, Accurate, 2-Phase, Single-Output Step-Down DC/DC Controller with Differential Output Sensing |
| 页数 / 页 | 50 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS. Soft Start-Up Into. Regular Soft … |
| 文件格式/大小 | PDF / 944 Kb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS. Soft Start-Up Into. Regular Soft Start-Up. Pre-Biased Output. Output Tracking
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LTC3839
TYPICAL PERFORMANCE CHARACTERISTICS Soft Start-Up Into Regular Soft Start-Up Pre-Biased Output Output Tracking
RUN RUN 5V/DIV 5V/DIV TRACK/SS 200mV/DIV TRACK/SS 200mV/DIV VOUT 500mV/DIV V TRACK/SS OUT V 500mV/DIV OUT 200mV/DIV 500mV/DIV 1ms/DIV 3839 G09 CSS = 10nF 1ms/DIV 3839 G10 CSS = 10nF 10ms/DIV 3839 G11 VIN = 12V VIN = 12V VIN = 12V VOUT = 1.2V VOUT = 1.2V VOUT = 1.2V FORCED CONTINUOUS MODE FORCED CONTINUOUS MODE VOUT PRE-BIASED TO 0.75V
Overcurrent Protection Short-Circuit Protection Overvoltage Protection
SHORT- CIRCUIT IL I TRIGGER L 10A/DIV 5A/DIV OVERVOLTAGE CREATED BY APPLYING V FULL CURRENT LIMIT OUT V A CHARGED CAPACITOR TO VOUT 1V/DIV OUT WHEN V 100mV/DIV OUT HIGHER CURRENT LIMIT STARTS TO FOLD BACK AS THAN HALF OF REGULATED V AC-COUPLED OUT DROPS BELOW HALF OF REGULATED IL C V OUT OUT 10A/DIV RECHARGE BG1 100mV/DIV 5V/DIV AC-COUPLED 5ms/DIV 3839 G12 V IN = 12V 20µs/DIV 3839 G14 V IN = 12V 500µs/DIV 3839 G13 VIN = 12V V V BG STAYS ON UNTIL OUT = 1.2V VOUT = 1.2V OUT = 1.2V FORCED CONTINUOUS MODE I FORCED CONTINUOUS V LOAD = 0A OUT IS PULLED MODE BELOW OVERVOLTAGE ILOAD = 0A THRESHOLD
Phase Relationship: Phase Relationship: Phase Relationship: PHASMD = Ground PHASMD = Float PHASMD = INTVCC
PLLIN PLLIN PLLIN 5V/DIV 5V/DIV 5V/DIV SW1 SW1 SW1 0° 10V/DIV 0° 10V/DIV 0° 10V/DIV SW2 SW2 SW2 240° 10V/DIV 180° 10V/DIV 180° 10V/DIV CLKOUT CLKOUT CLKOUT 60° 5V/DIV 5V/DIV 90° 5V/DIV 120° 500ns/DIV 3839 G15 500ns/DIV 3839 G16 500ns/DIV 3839 G17 FIGURE 13 CIRCUIT FIGURE 13 CIRCUIT FIGURE 13 CIRCUIT VIN = 12V VIN = 12V VIN = 12V LOAD = 0A LOAD = 0A LOAD = 0A MODE/PLLIN = 333kHz EXTERNAL CLOCK MODE/PLLIN = 333kHz EXTERNAL CLOCK MODE/PLLIN = 333kHz EXTERNAL CLOCK 3839fa 6 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Typical Performance Characteristics Pin Functions Functional Diagram Operation Typical Applications Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Soft Start-Up Into Regular Soft Start-Up Pre-Biased Output Output Tracking
RUN RUN 5V/DIV 5V/DIV TRACK/SS 200mV/DIV TRACK/SS 200mV/DIV VOUT 500mV/DIV V TRACK/SS OUT V 500mV/DIV OUT 200mV/DIV 500mV/DIV 1ms/DIV 3839 G09 CSS = 10nF 1ms/DIV 3839 G10 CSS = 10nF 10ms/DIV 3839 G11 VIN = 12V VIN = 12V VIN = 12V VOUT = 1.2V VOUT = 1.2V VOUT = 1.2V FORCED CONTINUOUS MODE FORCED CONTINUOUS MODE VOUT PRE-BIASED TO 0.75V
Overcurrent Protection Short-Circuit Protection Overvoltage Protection
SHORT- CIRCUIT IL I TRIGGER L 10A/DIV 5A/DIV OVERVOLTAGE CREATED BY APPLYING V FULL CURRENT LIMIT OUT V A CHARGED CAPACITOR TO VOUT 1V/DIV OUT WHEN V 100mV/DIV OUT HIGHER CURRENT LIMIT STARTS TO FOLD BACK AS THAN HALF OF REGULATED V AC-COUPLED OUT DROPS BELOW HALF OF REGULATED IL C V OUT OUT 10A/DIV RECHARGE BG1 100mV/DIV 5V/DIV AC-COUPLED 5ms/DIV 3839 G12 V IN = 12V 20µs/DIV 3839 G14 V IN = 12V 500µs/DIV 3839 G13 VIN = 12V V V BG STAYS ON UNTIL OUT = 1.2V VOUT = 1.2V OUT = 1.2V FORCED CONTINUOUS MODE I FORCED CONTINUOUS V LOAD = 0A OUT IS PULLED MODE BELOW OVERVOLTAGE ILOAD = 0A THRESHOLD
Phase Relationship: Phase Relationship: Phase Relationship: PHASMD = Ground PHASMD = Float PHASMD = INTVCC
PLLIN PLLIN PLLIN 5V/DIV 5V/DIV 5V/DIV SW1 SW1 SW1 0° 10V/DIV 0° 10V/DIV 0° 10V/DIV SW2 SW2 SW2 240° 10V/DIV 180° 10V/DIV 180° 10V/DIV CLKOUT CLKOUT CLKOUT 60° 5V/DIV 5V/DIV 90° 5V/DIV 120° 500ns/DIV 3839 G15 500ns/DIV 3839 G16 500ns/DIV 3839 G17 FIGURE 13 CIRCUIT FIGURE 13 CIRCUIT FIGURE 13 CIRCUIT VIN = 12V VIN = 12V VIN = 12V LOAD = 0A LOAD = 0A LOAD = 0A MODE/PLLIN = 333kHz EXTERNAL CLOCK MODE/PLLIN = 333kHz EXTERNAL CLOCK MODE/PLLIN = 333kHz EXTERNAL CLOCK 3839fa 6 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Typical Performance Characteristics Pin Functions Functional Diagram Operation Typical Applications Typical Application Related Parts