Datasheet LT3922-1 (Analog Devices) - 8
| Hersteller | Analog Devices |
| Beschreibung | 36V, 2.3A Synchronous Step-Up LED Driver with 25,000:1 PWM Dimming |
| Seiten / Seite | 32 / 8 — TYPICAL PERFORMANCE CHARACTERISTICS VIN = 12V, TA = 25°C, unless … |
| Dateiformat / Größe | PDF / 3.3 Mb |
| Dokumentensprache | Englisch |
TYPICAL PERFORMANCE CHARACTERISTICS VIN = 12V, TA = 25°C, unless otherwise noted. FB OPENLED Threshold
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LT3922-1
TYPICAL PERFORMANCE CHARACTERISTICS VIN = 12V, TA = 25°C, unless otherwise noted. FB OPENLED Threshold VISP – VISN SHORTLED Threshold Power Switch On-Resistance
1.20 180 350 RISING TOP SWITCH FALLING BOTTOM SWITCH 1.15 170 300 250 1.10 160 ANCE (mΩ) 200 1.05 150 TLED THRESHOLD (mV) 150 1.00 140 SHOR 100 ISN FB OPENLED THRESHOLD (V) 0.95 – V 130 50 V ISP POWER SWITCH ON–RESIST 0.90 120 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) 39221 G28 39221 G29 39221 G30
Efficiency vs VIN Efficiency vs ILED Regulated FB Voltage
100 100 1.23 ILED = 400mA VIN = 12V 98 11 LEDs (V 98 OUT ~ 33V) fSW = 2MHz 96 96 1.22 94 94 92 92 1.21 90 90 TAGE (V) 88 88 1.20 EFFICIENCY (%) EFFICIENCY (%) FB VOL 86 86 84 84 6 LED (V 1.19 OUT ~ 18V) f 82 SW = 400kHz 9 LED (V 82 OUT ~ 27V) fSW = 2MHz 12 LED (VOUT ~ 36V) 80 80 1.18 6 8 10 12 14 16 18 20 22 24 26 28 30 0 200 400 600 800 1000 –45 –20 5 30 55 80 105 130 155 VIN (V) ILED (mA) TEMPERATURE (°C) 39221 G31 39221 G32 39221 G33
PWMTG ON Voltage PWM Driver Propagation Delay FB OVLO Threshold
12 200 1.33 RISING TURN OFF FALLING TURN ON 11 1.30 160 TAGE (V) (V) Y (ns) 10 1.27 PWMTG 120 – V TION DELA 9 1.24 AGA V OUT 80 PROP 8 1.21 FB OVLO THRESHOLD VOL CPWMTG = 2.2nF (C0G type) 7 40 1.18 –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) 39221 G34 39221 G35 39221 G36 Rev 0 8 For more information www.analog.com Document Outline FEATURES DESCRIPTION APPLICATIONS 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 TYPICAL APPLICATION RELATED PARTS
TYPICAL PERFORMANCE CHARACTERISTICS VIN = 12V, TA = 25°C, unless otherwise noted. FB OPENLED Threshold VISP – VISN SHORTLED Threshold Power Switch On-Resistance
1.20 180 350 RISING TOP SWITCH FALLING BOTTOM SWITCH 1.15 170 300 250 1.10 160 ANCE (mΩ) 200 1.05 150 TLED THRESHOLD (mV) 150 1.00 140 SHOR 100 ISN FB OPENLED THRESHOLD (V) 0.95 – V 130 50 V ISP POWER SWITCH ON–RESIST 0.90 120 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) 39221 G28 39221 G29 39221 G30
Efficiency vs VIN Efficiency vs ILED Regulated FB Voltage
100 100 1.23 ILED = 400mA VIN = 12V 98 11 LEDs (V 98 OUT ~ 33V) fSW = 2MHz 96 96 1.22 94 94 92 92 1.21 90 90 TAGE (V) 88 88 1.20 EFFICIENCY (%) EFFICIENCY (%) FB VOL 86 86 84 84 6 LED (V 1.19 OUT ~ 18V) f 82 SW = 400kHz 9 LED (V 82 OUT ~ 27V) fSW = 2MHz 12 LED (VOUT ~ 36V) 80 80 1.18 6 8 10 12 14 16 18 20 22 24 26 28 30 0 200 400 600 800 1000 –45 –20 5 30 55 80 105 130 155 VIN (V) ILED (mA) TEMPERATURE (°C) 39221 G31 39221 G32 39221 G33
PWMTG ON Voltage PWM Driver Propagation Delay FB OVLO Threshold
12 200 1.33 RISING TURN OFF FALLING TURN ON 11 1.30 160 TAGE (V) (V) Y (ns) 10 1.27 PWMTG 120 – V TION DELA 9 1.24 AGA V OUT 80 PROP 8 1.21 FB OVLO THRESHOLD VOL CPWMTG = 2.2nF (C0G type) 7 40 1.18 –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) 39221 G34 39221 G35 39221 G36 Rev 0 8 For more information www.analog.com Document Outline FEATURES DESCRIPTION APPLICATIONS 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 TYPICAL APPLICATION RELATED PARTS