Datasheet LTC7871 (Analog Devices) - 8
| Hersteller | Analog Devices |
| Beschreibung | Six-Phase, Synchronous Bidirectional Buck or Boost Controller |
| Seiten / Seite | 48 / 8 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. … |
| Dateiformat / Größe | PDF / 1.4 Mb |
| Dokumentensprache | Englisch |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Efficiency Buck Mode. Power Loss Buck Mode
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LTC7871
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Efficiency Buck Mode Power Loss Buck Mode Efficiency Boost Mode
100 70 100 VHIGH = 48V 95 VLOW = 12V 60 95 FIGURE 18 CIRCUIT 90 90 50 85 85 40 80 80 30 75 EFFICIENCY (%) 75 POWER LOSS (W) EFFICIENCY (%) 20 70 70 VHIGH = 48V V 65 10 HIGH = 48V V 65 LOW = 12V VLOW = 12V FIGURE 18 CIRCUIT FIGURE 18 CIRCUIT 60 0 60 1 10 100 200 1 10 100 200 0.1 1 10 50 LOAD CURRENT (A) LOAD CURRENT (A) LOAD CURRENT (A) 7871 G01 7871 G02 7871 G03
SS Pin Pull-Up Current RUN Pin Threshold Power Loss Boost Mode vs T T emperature emperature vs Temperature RUN Pin Threshold vs Temperature
60 2.0 1.5 VHIGH = 48V ON VLOW = 12V OFF 50 FIGURE 18 CIRCUIT 1.6 1.4 40 1.3 1.2 30 1.2 0.8 POWER LOSS (W) 20 1.1 SS PULL–UP CURRENT (µA) RUN PIN THRESHOLD (V) 0.4 10 1.0 0 0 0.9 0.1 1 10 50 –45 –20 5 30 55 80 105 130 155 –45 –20 5 30 55 80 105 130 155 LOAD CURRENT (A) TEMPERATURE (°C) TEMPERATURE (°C) 7871 G04 7871 G05 7871 G06
Regulated Feedback Voltage Oscillator Frequency Undervoltage Lockout vs Temperature vs T T emperature emperature Threshold (V5) vs Temperature
1.206 300 5.0 VFBLOW VFBHIGH 1.204 280 4.8 TAGE (V) 1.202 RISING 260 4.6 1.200 240 4.4 1.198 TED FEEDBACK VOL FREQUENCY (kHz) UVLO THRESHOLD (V) 4.2 1.196 220 REGULA 1.194 200 4.0 –45 –20 5 30 55 80 105 130 155 –45 –20 5 30 55 80 105 130 155 –45 –20 5 30 55 80 105 130 155 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 7871 G07 7871 G08 7871 G09 Rev. 0 8 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 Serial Port Serial Port Register Details Typical Applications Package Description Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Efficiency Buck Mode Power Loss Buck Mode Efficiency Boost Mode
100 70 100 VHIGH = 48V 95 VLOW = 12V 60 95 FIGURE 18 CIRCUIT 90 90 50 85 85 40 80 80 30 75 EFFICIENCY (%) 75 POWER LOSS (W) EFFICIENCY (%) 20 70 70 VHIGH = 48V V 65 10 HIGH = 48V V 65 LOW = 12V VLOW = 12V FIGURE 18 CIRCUIT FIGURE 18 CIRCUIT 60 0 60 1 10 100 200 1 10 100 200 0.1 1 10 50 LOAD CURRENT (A) LOAD CURRENT (A) LOAD CURRENT (A) 7871 G01 7871 G02 7871 G03
SS Pin Pull-Up Current RUN Pin Threshold Power Loss Boost Mode vs T T emperature emperature vs Temperature RUN Pin Threshold vs Temperature
60 2.0 1.5 VHIGH = 48V ON VLOW = 12V OFF 50 FIGURE 18 CIRCUIT 1.6 1.4 40 1.3 1.2 30 1.2 0.8 POWER LOSS (W) 20 1.1 SS PULL–UP CURRENT (µA) RUN PIN THRESHOLD (V) 0.4 10 1.0 0 0 0.9 0.1 1 10 50 –45 –20 5 30 55 80 105 130 155 –45 –20 5 30 55 80 105 130 155 LOAD CURRENT (A) TEMPERATURE (°C) TEMPERATURE (°C) 7871 G04 7871 G05 7871 G06
Regulated Feedback Voltage Oscillator Frequency Undervoltage Lockout vs Temperature vs T T emperature emperature Threshold (V5) vs Temperature
1.206 300 5.0 VFBLOW VFBHIGH 1.204 280 4.8 TAGE (V) 1.202 RISING 260 4.6 1.200 240 4.4 1.198 TED FEEDBACK VOL FREQUENCY (kHz) UVLO THRESHOLD (V) 4.2 1.196 220 REGULA 1.194 200 4.0 –45 –20 5 30 55 80 105 130 155 –45 –20 5 30 55 80 105 130 155 –45 –20 5 30 55 80 105 130 155 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 7871 G07 7871 G08 7871 G09 Rev. 0 8 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 Serial Port Serial Port Register Details Typical Applications Package Description Typical Application Related Parts