Datasheet LTC3775 (Analog Devices) - 5
| Hersteller | Analog Devices |
| Beschreibung | High Frequency Synchronous Step-Down Voltage Mode DC/DC Controller |
| Seiten / Seite | 34 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS. Effi ciency vs Load Current. Effi … |
| Dateiformat / Größe | PDF / 553 Kb |
| Dokumentensprache | Englisch |
TYPICAL PERFORMANCE CHARACTERISTICS. Effi ciency vs Load Current. Effi ciency vs Input Voltage. Load Regulation
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LTC3775
TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency vs Load Current Effi ciency vs Input Voltage Load Regulation
100 100 1.206 VIN = 12V VIN = 12V 90 VOUT = 1.2V SW FREQ = 500kHz 90 1.204 FIRST PAGE CIRCUIT 80 SW FREQ = 500kHz 15A LOAD FIRST PAGE CIRCUIT 70 80 1.202 60 PULSE-SKIPPING MODE (V) 50 70 1.200 OUTV 40 1A LOAD EFFICIENCY (%) CONTINUOUS EFFICIENCY (%) 60 1.198 30 MODE V 20 OUT = 1.2V 50 CONTINUOUS MODE 1.196 10 SW FREQ = 500kHz FIRST PAGE CIRCUIT 0 40 1.194 0.01 0.1 1 10 100 4 8 12 16 20 24 28 0 2 4 6 8 10 12 14 16 LOAD CURRENT (A) INPUT VOLTAGE (V) LOAD CURRENT (A) 3775 G01 3775 G02 3775 G03
Load Step in Forced Continuous Line Regulation FB Voltage vs Temperature Mode
1.206 603 VOUT = 1.2V LOAD = 1A 1.204 FIRST PAGE CIRCUIT 602 VOUT(AC) 100mV/DIV 1.202 601 (V) I 1.200 600 L OUT 10A/DIV V 1.198 FB VOLTAGE (mV) 599 ILOAD 1.196 598 10A/DIV 1.194 597 4 8 12 16 20 24 28 –50 –25 0 25 50 75 100 125 50μs/DIV 3775 G06 VIN = 12V INPUT VOLTAGE (V) V TEMPERATURE (°C) OUT = 1.2V LOAD STEP = 0A TO 10A TO 0A 3775 G02 3775 G05 MODE/SYNC = 0V SW FREQ = 500kHz FIRST PAGE CIRCUIT
Positive Load Step in Forced Negative Load Step in Forced Continuous Mode Continuous Mode Load Step in Pulse-Skipping Mode
VSW VSW 20V/DIV 20V/DIV VOUT(AC) 100mV/DIV VOUT(AC) VOUT(AC) 100mV/DIV 100mV/DIV IL IL 10A/DIV IL 10A/DIV 10A/DIV ILOAD I I LOAD LOAD 10A/DIV 10A/DIV 10A/DIV 5μs/DIV 3775 G07 VIN = 12V 5μs/DIV 3775 G08 VIN = 12V 50μs/DIV 3775 G09 VIN = 12V VOUT = 1.2V VOUT = 1.2V VOUT = 1.2V LOAD STEP = 0A TO 10A LOAD STEP = 10A TO 0A LOAD STEP = 1A TO 11A TO 1A MODE/SYNC = 0V MODE/SYNC = 0V MODE/SYNC = INTVCC SW FREQ = 500kHz SW FREQ = 500kHz SW FREQ = 500kHz FIRST PAGE CIRCUIT FIRST PAGE CIRCUIT FIRST PAGE CIRCUIT 3775fa 5 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS BLOCK DIAGRAM APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION REVISION HISTORY TYPICAL APPLICATION RELATED PARTS
TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency vs Load Current Effi ciency vs Input Voltage Load Regulation
100 100 1.206 VIN = 12V VIN = 12V 90 VOUT = 1.2V SW FREQ = 500kHz 90 1.204 FIRST PAGE CIRCUIT 80 SW FREQ = 500kHz 15A LOAD FIRST PAGE CIRCUIT 70 80 1.202 60 PULSE-SKIPPING MODE (V) 50 70 1.200 OUTV 40 1A LOAD EFFICIENCY (%) CONTINUOUS EFFICIENCY (%) 60 1.198 30 MODE V 20 OUT = 1.2V 50 CONTINUOUS MODE 1.196 10 SW FREQ = 500kHz FIRST PAGE CIRCUIT 0 40 1.194 0.01 0.1 1 10 100 4 8 12 16 20 24 28 0 2 4 6 8 10 12 14 16 LOAD CURRENT (A) INPUT VOLTAGE (V) LOAD CURRENT (A) 3775 G01 3775 G02 3775 G03
Load Step in Forced Continuous Line Regulation FB Voltage vs Temperature Mode
1.206 603 VOUT = 1.2V LOAD = 1A 1.204 FIRST PAGE CIRCUIT 602 VOUT(AC) 100mV/DIV 1.202 601 (V) I 1.200 600 L OUT 10A/DIV V 1.198 FB VOLTAGE (mV) 599 ILOAD 1.196 598 10A/DIV 1.194 597 4 8 12 16 20 24 28 –50 –25 0 25 50 75 100 125 50μs/DIV 3775 G06 VIN = 12V INPUT VOLTAGE (V) V TEMPERATURE (°C) OUT = 1.2V LOAD STEP = 0A TO 10A TO 0A 3775 G02 3775 G05 MODE/SYNC = 0V SW FREQ = 500kHz FIRST PAGE CIRCUIT
Positive Load Step in Forced Negative Load Step in Forced Continuous Mode Continuous Mode Load Step in Pulse-Skipping Mode
VSW VSW 20V/DIV 20V/DIV VOUT(AC) 100mV/DIV VOUT(AC) VOUT(AC) 100mV/DIV 100mV/DIV IL IL 10A/DIV IL 10A/DIV 10A/DIV ILOAD I I LOAD LOAD 10A/DIV 10A/DIV 10A/DIV 5μs/DIV 3775 G07 VIN = 12V 5μs/DIV 3775 G08 VIN = 12V 50μs/DIV 3775 G09 VIN = 12V VOUT = 1.2V VOUT = 1.2V VOUT = 1.2V LOAD STEP = 0A TO 10A LOAD STEP = 10A TO 0A LOAD STEP = 1A TO 11A TO 1A MODE/SYNC = 0V MODE/SYNC = 0V MODE/SYNC = INTVCC SW FREQ = 500kHz SW FREQ = 500kHz SW FREQ = 500kHz FIRST PAGE CIRCUIT FIRST PAGE CIRCUIT FIRST PAGE CIRCUIT 3775fa 5 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS BLOCK DIAGRAM APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION REVISION HISTORY TYPICAL APPLICATION RELATED PARTS