Datasheet LT3479 (Analog Devices) - 4
| Hersteller | Analog Devices |
| Beschreibung | 3A, Full Featured DC/DC Converter with Soft-Start and Inrush Current Protection |
| Seiten / Seite | 20 / 4 — TYPICAL PERFORMANCE CHARACTERISTICS. Switch VCE(SAT). Inductor and Switch … |
| Dateiformat / Größe | PDF / 256 Kb |
| Dokumentensprache | Englisch |
TYPICAL PERFORMANCE CHARACTERISTICS. Switch VCE(SAT). Inductor and Switch Current Limit. VREF. SHDN Pin Turn-On Threshold
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LT3479
TYPICAL PERFORMANCE CHARACTERISTICS Switch VCE(SAT) Inductor and Switch Current Limit VREF
0.5 6 1.27 INDUCTOR CURRENT LIMIT 5 1.26 0.4 125°C 4 SWITCH CURRENT LIMIT 1.25 0.3 (V) VIN = 24V T) 25°C (V) –50°C 3 1.24 REF CE(SA V V 0.2 V CURRENT (A) IN = 2.5V 2 1.23 0.1 1 1.22 0 0 1.21 0 0.5 1 1.5 2 2.5 3 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 150 SWITCH CURRENT (A) TEMPERATURE (°C) TEMPERATURE (°C) 3479 G01 3479 G02 3479 G03
SHDN Pin Turn-On Threshold SHDN Pin Current VIN Pin Current
1.750 50 6 VC = 0.3V –50°C 40 1.625 5 30 25°C 1.500 4 20 125°C PIN CURRENT (mA) SHDN THRESHOLD (V) IN 1.375 SHDN PIN CURRENT (μA) V 3 10 1.250 0 2 –50 –25 0 25 50 75 100 125 0 4 8 12 16 20 24 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) VSHDN (V) TEMPERATURE (°C) 3479 G04 3479 G05 3479 G06
Soft-Start Pin Current Oscillator Frequency Feedback Amplifi er Offset Voltage
20 2.0 5 RT = 10k 1.6 4 15 VC = 0.5V 1.2 RT = 15k 3 TAGE (mV) (μA) 10 I SS 0.8 R V T = 20k 2 C = 1V FREQUENCY (MHz) 5 OFFSET VOL 0.4 1 0 0 0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (oC) 3479 G07 3479 G08 3479 G09 3479fc 4
TYPICAL PERFORMANCE CHARACTERISTICS Switch VCE(SAT) Inductor and Switch Current Limit VREF
0.5 6 1.27 INDUCTOR CURRENT LIMIT 5 1.26 0.4 125°C 4 SWITCH CURRENT LIMIT 1.25 0.3 (V) VIN = 24V T) 25°C (V) –50°C 3 1.24 REF CE(SA V V 0.2 V CURRENT (A) IN = 2.5V 2 1.23 0.1 1 1.22 0 0 1.21 0 0.5 1 1.5 2 2.5 3 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 150 SWITCH CURRENT (A) TEMPERATURE (°C) TEMPERATURE (°C) 3479 G01 3479 G02 3479 G03
SHDN Pin Turn-On Threshold SHDN Pin Current VIN Pin Current
1.750 50 6 VC = 0.3V –50°C 40 1.625 5 30 25°C 1.500 4 20 125°C PIN CURRENT (mA) SHDN THRESHOLD (V) IN 1.375 SHDN PIN CURRENT (μA) V 3 10 1.250 0 2 –50 –25 0 25 50 75 100 125 0 4 8 12 16 20 24 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) VSHDN (V) TEMPERATURE (°C) 3479 G04 3479 G05 3479 G06
Soft-Start Pin Current Oscillator Frequency Feedback Amplifi er Offset Voltage
20 2.0 5 RT = 10k 1.6 4 15 VC = 0.5V 1.2 RT = 15k 3 TAGE (mV) (μA) 10 I SS 0.8 R V T = 20k 2 C = 1V FREQUENCY (MHz) 5 OFFSET VOL 0.4 1 0 0 0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (oC) 3479 G07 3479 G08 3479 G09 3479fc 4