Datasheet LTC7821 (Analog Devices) - 6
| 制造商 | Analog Devices |
| 描述 | Hybrid Step-Down Synchronous Controller |
| 页数 / 页 | 36 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. … |
| 修订版 | A |
| 文件格式/大小 | PDF / 1.6 Mb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Efficiency and Power Loss. Efficiency at Various VIN
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LTC7821
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Efficiency and Power Loss Efficiency at Various VIN LTC7821 Start-Up Characteristic In Different Modes vs Load Current for VOUT = 12V (Pre-Balancing Period)
100 8 100 90 7 PAGE 1 VIN 99 SCHEMATIC 50V/DIV I PAGE 1 6 OUT = 10A 80 TIMER SCHEMATIC POWER LOSS (W) 98 1V/DIV 5 IOUT = 20A 70 97 SW1 TO SW3 fOSC = 500kHz 4 20V/DIV 60 VIN = 48V 96 EFFICIENCY (%) V 3 OUT = 12V EFFICIENCY (%) MID 50 95 2 20V/DIV CCM fSW = 500KHz 100ms/DIV 7821 G02 40 94 DCM 1 VOUT = 12V BURST CCM 30 0 93 0.1 1 10 100 30 40 50 60 70 80 LOAD CURRENT (A) INPUT VOLTAGE (V) 7821 G01 7821 G02
LTC7821 Start-Up Characteristic Shutdown Current vs Temperature Quiescent Current vs Temperature
400 1.2 V 1.1 IN 50V/DIV 350 I 1.0 VIN_SENSE FAULT 0.9 5V/DIV 300 0.8 PGOOD 5V/DIV (µA) 0.7 I VIN 250 Y CURRENT (mA) 0.6 I V VIN OUT 10V/DIV 0.5 SUPPL 100ms/DIV 7821 G03 200 0.4 0.3 150 0.2 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) 7821 G05 7821 G06
Shutdown (RUN) Threshold Input Voltage UVLO Threshold HYS_PRGM, TRACK/SS and FREQ vs Temperature vs Temperature Pin Current vs Temperature
1.40 9.0 10.3 1.35 10.2 8.8 10.1 1.30 RISING HYS_PRGM Pin RISING 8.6 10.0 (V) TRACK/SS Pin 1.25 (V) V RUN V IN FALLING 8.4 FALLING 9.9 1.20 FREQ Pin PIN CURRENT (µA) 9.8 8.2 1.15 9.7 1.10 8.0 9.6 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 7821 G07 7821 G08 7821 G09 Rev A 6 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Efficiency and Power Loss Efficiency at Various VIN LTC7821 Start-Up Characteristic In Different Modes vs Load Current for VOUT = 12V (Pre-Balancing Period)
100 8 100 90 7 PAGE 1 VIN 99 SCHEMATIC 50V/DIV I PAGE 1 6 OUT = 10A 80 TIMER SCHEMATIC POWER LOSS (W) 98 1V/DIV 5 IOUT = 20A 70 97 SW1 TO SW3 fOSC = 500kHz 4 20V/DIV 60 VIN = 48V 96 EFFICIENCY (%) V 3 OUT = 12V EFFICIENCY (%) MID 50 95 2 20V/DIV CCM fSW = 500KHz 100ms/DIV 7821 G02 40 94 DCM 1 VOUT = 12V BURST CCM 30 0 93 0.1 1 10 100 30 40 50 60 70 80 LOAD CURRENT (A) INPUT VOLTAGE (V) 7821 G01 7821 G02
LTC7821 Start-Up Characteristic Shutdown Current vs Temperature Quiescent Current vs Temperature
400 1.2 V 1.1 IN 50V/DIV 350 I 1.0 VIN_SENSE FAULT 0.9 5V/DIV 300 0.8 PGOOD 5V/DIV (µA) 0.7 I VIN 250 Y CURRENT (mA) 0.6 I V VIN OUT 10V/DIV 0.5 SUPPL 100ms/DIV 7821 G03 200 0.4 0.3 150 0.2 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) 7821 G05 7821 G06
Shutdown (RUN) Threshold Input Voltage UVLO Threshold HYS_PRGM, TRACK/SS and FREQ vs Temperature vs Temperature Pin Current vs Temperature
1.40 9.0 10.3 1.35 10.2 8.8 10.1 1.30 RISING HYS_PRGM Pin RISING 8.6 10.0 (V) TRACK/SS Pin 1.25 (V) V RUN V IN FALLING 8.4 FALLING 9.9 1.20 FREQ Pin PIN CURRENT (µA) 9.8 8.2 1.15 9.7 1.10 8.0 9.6 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 7821 G07 7821 G08 7821 G09 Rev A 6 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Related Parts