Datasheet LTC7818 (Analog Devices) - 9
| Fabricante | Analog Devices |
| Descripción | 40V, Low IQ, 3MHz, Triple Output Buck/Buck/Boost Synchronous Controller |
| Páginas / Página | 44 / 9 — TYPICAL PERFORMANCE CHARACTERISTICS. Maximum Current Sense. SENSE1,2–. … |
| Formato / tamaño de archivo | PDF / 3.1 Mb |
| Idioma del documento | Inglés |
TYPICAL PERFORMANCE CHARACTERISTICS. Maximum Current Sense. SENSE1,2–. SENSE1,2 and SENSE3+ Current. and SENSE3+ Current
Versión de texto del documento
LTC7818
TYPICAL PERFORMANCE CHARACTERISTICS Maximum Current Sense Maximum Current Sense SENSE1,2– SENSE1,2 and SENSE3+ Current and SENSE3+ Current Threshold vs SENSE Common Maximum Current Sense Threshold Threshold vs ITH Voltage Threshold vs ITH V vs Voltage vs V Mode Voltage vs SENSE Common Mode Voltage
50 900 70 PULSE–SKIPPING 40 BURST MODE 800 SENSE1– CURRENT 60 FORCED CONTINUOUS 30 700 50 600 20 500 SENSE2– OR SENSE3+ CURRENT 40 10 400 30 0 300 20 –10 SENSE CURRENT (μA) 200 –20 100 10 MODE = INTV MAXIMUM CURRENT SENSE THRESHOLD (mV) CC –30 0 MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 5 10 15 20 25 30 35 40 0 5 10 15 20 25 30 35 40 ITH VOLTAGE (V) SENSE VOLTAGE (V) SENSE VOLTAGE (V) 7818 G19 7818 G20 7818 G21
SENSE1,2– and SENSE3+ Input SENSE1,2–, SENSE3+ Input SENSE1,2+ SENSE1,2 and SENSE3 + − and SENSE3 Input – Input Buck Foldback Current Limit Current vs Temperature Current vs T Current vs Temperature Current vs T
70 900 MODE = INTV 1.0 CC MODE = INTV 800 CC 0.8 60 SENSE = INTV 700 CC+0.5V 0.6 50 600 SENSE = 3.3V 0.4 SENSE = 12V 500 40 0.2 400 0.0 30 300 SENSE = 1V –0.2 20 200 –0.4 SENSE CURRENT (µA) SENSE CURRENT (μA) SENSE = 0V 100 SENSE1– = INTVCC–0.5V –0.6 10 0 –0.8 SENSE2–,SENSE3+ = INTV MAXIMUM CURRENT SENSE THRESHOLD (mV) CC–0.5V 0 –100 –1.0 0 100 200 300 400 500 600 700 800 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 FEEDBACK VOLTAGE (mV) TEMPERATURE (oC) TEMPERATURE (oC) 7818 G22 7818 G23 7818 G24
Oscillator Frequency Oscillator Frequency Boost Current Monitor Voltage Boost Channel Current Monitor vs Temperature vs T Output Voltage Noise Spectrum Output V vs Sense Voltage Output vs Sense Voltage
10 0 1.6 R FIGURE 14 CIRCUIT, V FREQ=374k (100kHz) OUT = 5V MODE = INTVCC 8 R –10 DETECTOR = PEAK–HOLD FREQ=75k (500kHz) 1.4 VSENSE3+ = 12V R RBW = 5.1kHz FREQ=12.5k (3MHz) –20 6 FREQ=GND (380kHz) PLLIN/SPREAD = GND 1.2 FREQ=INTVCC (2.25MHz) –30 4 TAGE (V) –40 1.0 PLLIN/SPREAD = INTVCC 2 –50 0.8 0 –60 0.6 AMPLITUDE (dBm) –70 –2 0.4 CHANGE IN FREQUENCY (%) –80 IMON3 OUTPUT VOL –4 –90 0.2 –6 –100 0 –55 –25 5 35 65 95 125 155 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 –30 –20 –10 0 10 20 30 40 50 60 TEMPERATURE (oC) FREQUENCY (MHz) V + – SENSE3 – VSENSE3 (mV) 7818 G25 7818 G26 7818 G27 Rev 0 For more information www.analog.com 9 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Maximum Current Sense Maximum Current Sense SENSE1,2– SENSE1,2 and SENSE3+ Current and SENSE3+ Current Threshold vs SENSE Common Maximum Current Sense Threshold Threshold vs ITH Voltage Threshold vs ITH V vs Voltage vs V Mode Voltage vs SENSE Common Mode Voltage
50 900 70 PULSE–SKIPPING 40 BURST MODE 800 SENSE1– CURRENT 60 FORCED CONTINUOUS 30 700 50 600 20 500 SENSE2– OR SENSE3+ CURRENT 40 10 400 30 0 300 20 –10 SENSE CURRENT (μA) 200 –20 100 10 MODE = INTV MAXIMUM CURRENT SENSE THRESHOLD (mV) CC –30 0 MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 5 10 15 20 25 30 35 40 0 5 10 15 20 25 30 35 40 ITH VOLTAGE (V) SENSE VOLTAGE (V) SENSE VOLTAGE (V) 7818 G19 7818 G20 7818 G21
SENSE1,2– and SENSE3+ Input SENSE1,2–, SENSE3+ Input SENSE1,2+ SENSE1,2 and SENSE3 + − and SENSE3 Input – Input Buck Foldback Current Limit Current vs Temperature Current vs T Current vs Temperature Current vs T
70 900 MODE = INTV 1.0 CC MODE = INTV 800 CC 0.8 60 SENSE = INTV 700 CC+0.5V 0.6 50 600 SENSE = 3.3V 0.4 SENSE = 12V 500 40 0.2 400 0.0 30 300 SENSE = 1V –0.2 20 200 –0.4 SENSE CURRENT (µA) SENSE CURRENT (μA) SENSE = 0V 100 SENSE1– = INTVCC–0.5V –0.6 10 0 –0.8 SENSE2–,SENSE3+ = INTV MAXIMUM CURRENT SENSE THRESHOLD (mV) CC–0.5V 0 –100 –1.0 0 100 200 300 400 500 600 700 800 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 FEEDBACK VOLTAGE (mV) TEMPERATURE (oC) TEMPERATURE (oC) 7818 G22 7818 G23 7818 G24
Oscillator Frequency Oscillator Frequency Boost Current Monitor Voltage Boost Channel Current Monitor vs Temperature vs T Output Voltage Noise Spectrum Output V vs Sense Voltage Output vs Sense Voltage
10 0 1.6 R FIGURE 14 CIRCUIT, V FREQ=374k (100kHz) OUT = 5V MODE = INTVCC 8 R –10 DETECTOR = PEAK–HOLD FREQ=75k (500kHz) 1.4 VSENSE3+ = 12V R RBW = 5.1kHz FREQ=12.5k (3MHz) –20 6 FREQ=GND (380kHz) PLLIN/SPREAD = GND 1.2 FREQ=INTVCC (2.25MHz) –30 4 TAGE (V) –40 1.0 PLLIN/SPREAD = INTVCC 2 –50 0.8 0 –60 0.6 AMPLITUDE (dBm) –70 –2 0.4 CHANGE IN FREQUENCY (%) –80 IMON3 OUTPUT VOL –4 –90 0.2 –6 –100 0 –55 –25 5 35 65 95 125 155 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 –30 –20 –10 0 10 20 30 40 50 60 TEMPERATURE (oC) FREQUENCY (MHz) V + – SENSE3 – VSENSE3 (mV) 7818 G25 7818 G26 7818 G27 Rev 0 For more information www.analog.com 9 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts