Datasheet LTC3894 (Analog Devices) - 7
| Hersteller | Analog Devices |
| Beschreibung | 150V Low IQ Step-Down DC/DC Controller with 100% Duty Cycle Capability |
| Seiten / Seite | 36 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. … |
| Revision | A |
| Dateiformat / Größe | PDF / 2.9 Mb |
| Dokumentensprache | Englisch |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Maximum Current Sense. Threshold vs ITH Voltage
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LTC3894
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Maximum Current Sense Maximum Current Sense Threshold vs ITH Voltage Buck Foldback Current Limit Threshold vs Duty Cycle
100 120.000 120.0 PULSE SKIPPING MODE Burst Mode OPERATION 80 100.000 100.0 60 80.000 80.0 40 60.000 60.0 20 40.000 40.0 0 20.000 20.0 CURRENT SENSE THRESHOLD (mV) MAXIMUM CURRENT SENSE/ITH = 90mV/V PGUV < 0.72V –20 MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 0 0.3 0.6 1.0 1.3 1.6 0 100 200 300 400 500 600 700 800 0 15 30 45 60 75 90 ITH (V) FEEDBACK VOLTAGE (mV) DUTY CYCLE (%) 3894 G19 3894 G20 3894 G21
IVIN and ISENSE– vs VSENSE– IVIN and ISENSE– vs VSENSE– CLC vs VIN at 150°C (Burst Mode Operation) (Burst Mode Operation)
120 30.000 30.000 100 25.000 25.000 80 20.000 20.000 + (µA) + (µA) VIN RISING 60 SENSE 15.000 SENSE– RISING SENSE 15.000 SENSE– FALLING VIN FALLING 40 AND I 10.000 AND I 10.000 V I VIN I VIN OUT = 0V 20 VOUT = 0.5V V 5.000 5.000 OUT = 1.0V VOUT = 2.0V (ZOOMED IN VSENSE–) MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 0 0 3.50 3.75 4 4.25 4.50 4.75 5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 2.5 3 3.5 4 4.5 5 5.5 VIN (V) VSENSE– (V) VSENSE– (V) 3894 G22 3894 G23 3894 G24
IVIN and ISENSE– vs VSENSE– IVIN and ISENSE– vs VSENSE– (Pulse-Skipping Mode) (Pulse-Skipping Mode) ISENSE+ vs VSENSE+
2.000 2.000 100.000 1.750 1.750 0 1.500 1.500 –100.000 – (mA) 1.250 – (mA) 1.250 I + (nA) SENSE 1.000 SENSE 1.000 VIN RISING –200.000 ISENSE– RISING 0.750 I AND I 0.750 SENSE– FALLING I SENSE AND I I –300.000 VIN FALLING I VIN 0.500 I VIN 0.500 –400.000 0.250 0.250 (ZOOMED IN VSENSE–) 0 0 –500.000 0 5 10 15 20 25 30 35 40 45 50 55 60 65 2.5 3 3.5 4 4.5 5 5.5 0 1 2 3 4 5 VSENSE– (V) V V SENSE– (V) SENSE+ (V) 3894 G25 3894 G26 3894 G27 Rev. A For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration 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 TA = 25°C, unless otherwise noted. Maximum Current Sense Maximum Current Sense Threshold vs ITH Voltage Buck Foldback Current Limit Threshold vs Duty Cycle
100 120.000 120.0 PULSE SKIPPING MODE Burst Mode OPERATION 80 100.000 100.0 60 80.000 80.0 40 60.000 60.0 20 40.000 40.0 0 20.000 20.0 CURRENT SENSE THRESHOLD (mV) MAXIMUM CURRENT SENSE/ITH = 90mV/V PGUV < 0.72V –20 MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 0 0.3 0.6 1.0 1.3 1.6 0 100 200 300 400 500 600 700 800 0 15 30 45 60 75 90 ITH (V) FEEDBACK VOLTAGE (mV) DUTY CYCLE (%) 3894 G19 3894 G20 3894 G21
IVIN and ISENSE– vs VSENSE– IVIN and ISENSE– vs VSENSE– CLC vs VIN at 150°C (Burst Mode Operation) (Burst Mode Operation)
120 30.000 30.000 100 25.000 25.000 80 20.000 20.000 + (µA) + (µA) VIN RISING 60 SENSE 15.000 SENSE– RISING SENSE 15.000 SENSE– FALLING VIN FALLING 40 AND I 10.000 AND I 10.000 V I VIN I VIN OUT = 0V 20 VOUT = 0.5V V 5.000 5.000 OUT = 1.0V VOUT = 2.0V (ZOOMED IN VSENSE–) MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 0 0 3.50 3.75 4 4.25 4.50 4.75 5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 2.5 3 3.5 4 4.5 5 5.5 VIN (V) VSENSE– (V) VSENSE– (V) 3894 G22 3894 G23 3894 G24
IVIN and ISENSE– vs VSENSE– IVIN and ISENSE– vs VSENSE– (Pulse-Skipping Mode) (Pulse-Skipping Mode) ISENSE+ vs VSENSE+
2.000 2.000 100.000 1.750 1.750 0 1.500 1.500 –100.000 – (mA) 1.250 – (mA) 1.250 I + (nA) SENSE 1.000 SENSE 1.000 VIN RISING –200.000 ISENSE– RISING 0.750 I AND I 0.750 SENSE– FALLING I SENSE AND I I –300.000 VIN FALLING I VIN 0.500 I VIN 0.500 –400.000 0.250 0.250 (ZOOMED IN VSENSE–) 0 0 –500.000 0 5 10 15 20 25 30 35 40 45 50 55 60 65 2.5 3 3.5 4 4.5 5 5.5 0 1 2 3 4 5 VSENSE– (V) V V SENSE– (V) SENSE+ (V) 3894 G25 3894 G26 3894 G27 Rev. A For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts