Datasheet LT3746 (Analog Devices) - 9
| Hersteller | Analog Devices |
| Beschreibung | 32-Channel 20mA LED Driver with Buck Controller |
| Seiten / Seite | 28 / 9 — Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. … |
| Dateiformat / Größe | PDF / 609 Kb |
| Dokumentensprache | Englisch |
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. (VIN - VCAP) UVLO Threshold vs
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LT3746
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. (VIN - VCAP) UVLO Threshold vs Oscillator Frequency fOSC vs Temperature Oscillator Frequency fOSC vs RT Temperature
4.90 1000 520 UVLO+ 4.80 800 510 (V) 4.70 600 CAP (kHz) (kHz) 500 - V f OSC f OSC V IN 4.60 400 UVLO– 490 4.50 200 4.40 0 480 –50 –25 0 25 50 75 100 125 20 60 100 140 180 220 260 300 –50 –25 0 25 50 75 100 125 JUNCTION TEMPERATURE (°C) RT (kΩ) JUNCTION TEMPERATURE (°C) 3746 G19 3746 G20 3746 G21
FB Regulation Voltage vs LED Regulation Voltage vs Soft-Start Charge Current ISS vs Load Current Load Current Temperature
1.208 0.52 –10.0 1.206 –10.2 0.51 1.204 –10.4 (V) (V) 0.50 (µA) V FB 1.202 V LEDxx I SS–10.6 0.49 1.200 –10.8 1.198 0.48 –11.0 0 200 400 600 800 1000 0 200 400 600 800 1000 –50 –25 0 25 50 75 100 125 LOAD CURRENT (mA) LOAD CURRENT (mA) JUNCTION TEMPERATURE (°C) 3746 G22 3746 G23 3746 G24
Current Sense Threshold CAP Bias Voltage (VIN - VCAP) CAP Bias Voltage (VIN - VCAP) (VISP - VISN) vs VISN vs VIN vs ICAP
49 6.90 6.90 6.80 T = 25°C 6.86 48 T = 125°C 6.70 T = –40°C (mV) T = –40°C (V) 6.82 (V) 6.60 ISN 47 CAP CAP T = 125°C -V -V T = 25°C -V T = 25°C IN 6.50 ISP IN 6.78 V V V 6.40 46 T = 125°C 6.74 T = –40°C 6.30 45 6.70 6.20 0 3 6 9 12 15 0 10 20 30 40 50 60 0 4 8 12 16 20 24 VISN (V) VIN (V) ICAP (mA) 3746 G25 3746 G26 3746 G27 3746fa For more information www.linear.com/3746 9 Document Outline Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Pin Functions Block Diagram Applications Information Typical Application Related Parts
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. (VIN - VCAP) UVLO Threshold vs Oscillator Frequency fOSC vs Temperature Oscillator Frequency fOSC vs RT Temperature
4.90 1000 520 UVLO+ 4.80 800 510 (V) 4.70 600 CAP (kHz) (kHz) 500 - V f OSC f OSC V IN 4.60 400 UVLO– 490 4.50 200 4.40 0 480 –50 –25 0 25 50 75 100 125 20 60 100 140 180 220 260 300 –50 –25 0 25 50 75 100 125 JUNCTION TEMPERATURE (°C) RT (kΩ) JUNCTION TEMPERATURE (°C) 3746 G19 3746 G20 3746 G21
FB Regulation Voltage vs LED Regulation Voltage vs Soft-Start Charge Current ISS vs Load Current Load Current Temperature
1.208 0.52 –10.0 1.206 –10.2 0.51 1.204 –10.4 (V) (V) 0.50 (µA) V FB 1.202 V LEDxx I SS–10.6 0.49 1.200 –10.8 1.198 0.48 –11.0 0 200 400 600 800 1000 0 200 400 600 800 1000 –50 –25 0 25 50 75 100 125 LOAD CURRENT (mA) LOAD CURRENT (mA) JUNCTION TEMPERATURE (°C) 3746 G22 3746 G23 3746 G24
Current Sense Threshold CAP Bias Voltage (VIN - VCAP) CAP Bias Voltage (VIN - VCAP) (VISP - VISN) vs VISN vs VIN vs ICAP
49 6.90 6.90 6.80 T = 25°C 6.86 48 T = 125°C 6.70 T = –40°C (mV) T = –40°C (V) 6.82 (V) 6.60 ISN 47 CAP CAP T = 125°C -V -V T = 25°C -V T = 25°C IN 6.50 ISP IN 6.78 V V V 6.40 46 T = 125°C 6.74 T = –40°C 6.30 45 6.70 6.20 0 3 6 9 12 15 0 10 20 30 40 50 60 0 4 8 12 16 20 24 VISN (V) VIN (V) ICAP (mA) 3746 G25 3746 G26 3746 G27 3746fa For more information www.linear.com/3746 9 Document Outline Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Pin Functions Block Diagram Applications Information Typical Application Related Parts