Datasheet LT8471 (Analog Devices) - 5
| Hersteller | Analog Devices |
| Beschreibung | Dual Multitopology DC/DC Converters with 2A Switches and Synchronization |
| Seiten / Seite | 36 / 5 — Typical perForMance characTerisTics TA = 25°C, unless otherwise … |
| Dateiformat / Größe | PDF / 488 Kb |
| Dokumentensprache | Englisch |
Typical perForMance characTerisTics TA = 25°C, unless otherwise specified. Primary Switch Current Limit. at 500kHz
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LT8471
Typical perForMance characTerisTics TA = 25°C, unless otherwise specified. Primary Switch Current Limit at 500kHz CH1, CH2 Switch VCESAT Skyhook Switch VCESAT
3.5 0.6 0.5 3.0 0.5 0.4 2.5 (V) 0.4 T (V) T 0.3 2.0 CESA 0.3 CESA 1.5 0.2 0.2 1.0 SWITCH V SWITCH V SWITCH CURRENT LIMIT (A) 0.1 0.5 0.1 0 0 0 0 20 40 60 80 100 0 0.5 1 1.5 2 2.5 0 0.1 0.2 0.3 0.4 0.5 0.6 DUTY CYCLE (%) SWITCH CURRENT (A) SWITCH CURRENT (A) 8471 G01 8471 G02 8471 G03
Switch Current Limit Skyhook Current Limit at Minimum Duty Cycle vs Temperature Feedback Voltages
3.0 1.0 805 –805 2.5 795 –795 0.8 + FB 2.0 785 – FB –785 1.5 0.5 TAGE (mV) 775 –775 1.0 FB VOL TICH CURRENT LIMIT (A) SW 0.3 SWITCH CURRENT LIMIT (A) 0.5 765 –765 0 0 755 –755 –50 –30 –10 10 30 50 70 90 110 130 150 –50 –30 –10 10 30 50 70 90 110 130 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 8471 G04 8471 G05 8471 G06
Switching Frequency Oscillator Frequency During Soft-Start Internal UVLO for V
)
IN1 and VIN2
1.00 2.5 1.2 /f NOM SW R 1.0 T = 84.5k 2.4 0.75 VIN1 0.8 2.3 TAGE (V) VIN2 0.6 0.50 Y VOL 2.2 FREQUENCY (MHz) 0.4 SUPPL 0.25 2.1 0.2 RT = 732k 0 0 2.0 –55 –35 –15 5 25 45 65 85 105 125 NORMALIZED OSCILLATOR FREQUENCY (f –0.8 –0.4 0 0.4 0.8 –50 –30 –10 10 30 50 70 90 110 130 150 TEMPERATURE (°C) FB VOLTAGE (V) TEMPERATURE (°C) 8471 G07 8471 G08 8471 G09 8471fd For more information www.linear.com/8471 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Related Parts
Typical perForMance characTerisTics TA = 25°C, unless otherwise specified. Primary Switch Current Limit at 500kHz CH1, CH2 Switch VCESAT Skyhook Switch VCESAT
3.5 0.6 0.5 3.0 0.5 0.4 2.5 (V) 0.4 T (V) T 0.3 2.0 CESA 0.3 CESA 1.5 0.2 0.2 1.0 SWITCH V SWITCH V SWITCH CURRENT LIMIT (A) 0.1 0.5 0.1 0 0 0 0 20 40 60 80 100 0 0.5 1 1.5 2 2.5 0 0.1 0.2 0.3 0.4 0.5 0.6 DUTY CYCLE (%) SWITCH CURRENT (A) SWITCH CURRENT (A) 8471 G01 8471 G02 8471 G03
Switch Current Limit Skyhook Current Limit at Minimum Duty Cycle vs Temperature Feedback Voltages
3.0 1.0 805 –805 2.5 795 –795 0.8 + FB 2.0 785 – FB –785 1.5 0.5 TAGE (mV) 775 –775 1.0 FB VOL TICH CURRENT LIMIT (A) SW 0.3 SWITCH CURRENT LIMIT (A) 0.5 765 –765 0 0 755 –755 –50 –30 –10 10 30 50 70 90 110 130 150 –50 –30 –10 10 30 50 70 90 110 130 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 8471 G04 8471 G05 8471 G06
Switching Frequency Oscillator Frequency During Soft-Start Internal UVLO for V
)
IN1 and VIN2
1.00 2.5 1.2 /f NOM SW R 1.0 T = 84.5k 2.4 0.75 VIN1 0.8 2.3 TAGE (V) VIN2 0.6 0.50 Y VOL 2.2 FREQUENCY (MHz) 0.4 SUPPL 0.25 2.1 0.2 RT = 732k 0 0 2.0 –55 –35 –15 5 25 45 65 85 105 125 NORMALIZED OSCILLATOR FREQUENCY (f –0.8 –0.4 0 0.4 0.8 –50 –30 –10 10 30 50 70 90 110 130 150 TEMPERATURE (°C) FB VOLTAGE (V) TEMPERATURE (°C) 8471 G07 8471 G08 8471 G09 8471fd For more information www.linear.com/8471 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Related Parts