Datasheet LTC3851A (Analog Devices) - 5
| Fabricante | Analog Devices |
| Descripción | Synchronous Step-Down Switching Regulator Controller |
| Páginas / Página | 30 / 5 — Typical perForMance characTerisTics. Efficiency and Power Loss. Load … |
| Formato / tamaño de archivo | PDF / 445 Kb |
| Idioma del documento | Inglés |
Typical perForMance characTerisTics. Efficiency and Power Loss. Load Step. vs Input Voltage. (Burst Mode Operation)
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Versión de texto del documento
LTC3851A
Typical perForMance characTerisTics Efficiency and Power Loss Load Step vs Input Voltage (Burst Mode Operation)
100 10000 ILOAD EFFICIENCY, 5A/DIV 95 IOUT = 5A POWER LOSS, 0.2A TO 7.5A IOUT = 5A POWER LOSS (mW) I 90 L 5A/DIV 85 1000 EFFICIENCY, VOUT IOUT = 0.5A 100mV/DIV EFFICIENCY (%) 80 AC-COUPLED POWER LOSS, IOUT = 0.5A V V 3851A G05 75 OUT = 1.5V 100µs/DIV IN = 12V V VIN = 12V OUT = 3.3V FIGURE 11 CIRCUIT FIGURE 11 CIRCUIT 70 100 4 8 12 16 20 24 28 32 INPUT VOLTAGE (V) 3851A G04
Load Step Load Step (Forced Continuous Mode) (Pulse-Skipping Mode)
ILOAD ILOAD 5A/DIV 5A/DIV 0.2A TO 7.5A 0.2A TO 7.5A IL IL 5A/DIV 5A/DIV VOUT VOUT 100mV/DIV 100mV/DIV AC-COUPLED AC-COUPLED V 3851A G06 3851A G07 OUT = 1.5V 100µs/DIV VOUT = 1.5V 100µs/DIV VIN = 12V VIN = 12V FIGURE 11 CIRCUIT FIGURE 11 CIRCUIT
Start-Up with Prebiased Output Coincident Tracking with Master Inductor Current at Light Load at 2V Supply
FORCED CONTINOUS V VMASTER MODE OUT 2V/DIV 0.5V/DIV V 5A/DIV OUT TK/SS 2A LOAD Burst Mode 0.5V/DIV 0.5V/DIV OPERATION 5A/DIV VFB PULSE-SKIPPING 0.5V/DIV MODE 5A/DIV V 3851A G08 OUT = 1.5V 1µs/DIV 20ms/DIV 3851A G09 10ms/DIV 3851A G10 VIN = 12V ILOAD = 1mA FIGURE 11 CIRCUIT 3851afa 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
Typical perForMance characTerisTics Efficiency and Power Loss Load Step vs Input Voltage (Burst Mode Operation)
100 10000 ILOAD EFFICIENCY, 5A/DIV 95 IOUT = 5A POWER LOSS, 0.2A TO 7.5A IOUT = 5A POWER LOSS (mW) I 90 L 5A/DIV 85 1000 EFFICIENCY, VOUT IOUT = 0.5A 100mV/DIV EFFICIENCY (%) 80 AC-COUPLED POWER LOSS, IOUT = 0.5A V V 3851A G05 75 OUT = 1.5V 100µs/DIV IN = 12V V VIN = 12V OUT = 3.3V FIGURE 11 CIRCUIT FIGURE 11 CIRCUIT 70 100 4 8 12 16 20 24 28 32 INPUT VOLTAGE (V) 3851A G04
Load Step Load Step (Forced Continuous Mode) (Pulse-Skipping Mode)
ILOAD ILOAD 5A/DIV 5A/DIV 0.2A TO 7.5A 0.2A TO 7.5A IL IL 5A/DIV 5A/DIV VOUT VOUT 100mV/DIV 100mV/DIV AC-COUPLED AC-COUPLED V 3851A G06 3851A G07 OUT = 1.5V 100µs/DIV VOUT = 1.5V 100µs/DIV VIN = 12V VIN = 12V FIGURE 11 CIRCUIT FIGURE 11 CIRCUIT
Start-Up with Prebiased Output Coincident Tracking with Master Inductor Current at Light Load at 2V Supply
FORCED CONTINOUS V VMASTER MODE OUT 2V/DIV 0.5V/DIV V 5A/DIV OUT TK/SS 2A LOAD Burst Mode 0.5V/DIV 0.5V/DIV OPERATION 5A/DIV VFB PULSE-SKIPPING 0.5V/DIV MODE 5A/DIV V 3851A G08 OUT = 1.5V 1µs/DIV 20ms/DIV 3851A G09 10ms/DIV 3851A G10 VIN = 12V ILOAD = 1mA FIGURE 11 CIRCUIT 3851afa 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts