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Datasheet LTC3852 (Analog Devices) - 5

ПроизводительAnalog Devices
ОписаниеLow Input Voltage, Synchronous Step-Down DC/DC Controller
Страниц / Страница32 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS. Effi ciency vs Output Current. Load …
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Язык документаанглийский

TYPICAL PERFORMANCE CHARACTERISTICS. Effi ciency vs Output Current. Load Step. and Mode. (Burst Mode Operation)

TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency vs Output Current Load Step and Mode (Burst Mode Operation)

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Текстовая версия документа

LTC3852
TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency vs Output Current Load Step and Mode Load Step (Burst Mode Operation)
100 I Burst Mode OPERATION LOAD ILOAD 10A/DIV 10A/DIV 5A TO 15A 1A TO 12A 80 IL IL 10A/DIV 60 10A/DIV CCM V V OUT OUT 40 100mV/DIV 100mV/DIV EFFICIENCY(%) AC-COUPLED AC-COUPLED PULSE-SKIPPING 20 3852 G04 3852 G05 V 50μs/DIV V 20μs/DIV OUT = 1.5V OUT = 1.2V V V IN1 = 3.3V IN1 = 3.3V FIGURE 16 CIRCUIT FIGURE 16 CIRCUIT FIGURE 17 CIRCUIT 0 0.01 0.1 1 10 100 LOAD CURRENT (A) 3852 G02
Load Step Load Step (Forced Continuous Mode) (Pulse-Skipping Mode) Inductor Current at Light Load
ILOAD ILOAD FORCED 10A/DIV 10A/DIV CONTINOUS 1A TO 12A 1A TO 12A MODE 5A/DIV IL IL Burst Mode 10A/DIV 10A/DIV OPERATION 5A/DIV VOUT VOUT PULSE- 100mV/DIV 100mV/DIV SKIPPING AC- AC- MODE 5A/DIV COUPLED COUPLED 3852 G06 3852 G07 3852 G08 V 20μs/DIV OUT = 1.2V V 20μs/DIV OUT = 1.2V V 1μs/DIV OUT = 1.5V VIN1 = 3.3V VIN1 = 3.3V VIN2 = 3.3V FIGURE 17 CIRCUIT FIGURE 17 CIRCUIT ILOAD = 500mA FIGURE 17 CIRCUIT
Start-Up with Prebiased Output Coincident Tracking with Master Ratiometric Tracking with Master at 0.5V Supply Supply
VMASTER VMASTER 0.5V/DIV 0.5V/DIV VOUT 1V/DIV TRACK/SS 0.5V/DIV VOUT 2A LOAD 0.5V/DIV VOUT 2A LOAD VFB 0.5V/DIV 0.5V/DIV 0V 0V 0V 3852 G09 20ms/DIV 3852 G10 100ms/DIV 3852 G11 10ms/DIV FIGURE 16 CIRCUIT FIGURE 16 CIRCUIT FIGURE 16 CIRCUIT 3852f 5
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