Datasheet LT3922-1 (Analog Devices) - 6
| Hersteller | Analog Devices |
| Beschreibung | 36V, 2.3A Synchronous Step-Up LED Driver with 25,000:1 PWM Dimming |
| Seiten / Seite | 32 / 6 — 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. INTVCC and VREF UVLO Falling
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LT3922-1
TYPICAL PERFORMANCE CHARACTERISTICS VIN = 12V, TA = 25°C, unless otherwise noted. INTVCC and VREF UVLO Falling VREF Line Regulation Thresholds Minimum Off Time
2.010 3.0 30 2.008 2.7 2.006 25 2.004 2.4 20 2.002 TAGE (V) 2.1 2.000 TAGE (V) 15 1.998 1.8 VOL 1.996 10 1.5 MINIMUM OFF TIME (ns) 1.994 THRESHOLD VOL 1.2 5 1.992 INTVCC UVLO VREF UVLO 1.990 0.9 0 0 3 6 9 12 15 18 21 24 27 30 33 36 –45 –20 5 30 55 80 105 130 155 –45 –20 5 30 55 80 105 130 155 VIN VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 39221 G10 39221 G11 39221 G12
RT and RP Pin Current Limits Soft-Start Currents Soft-Start Thresholds
80 25 2.0 75 20 1.6 70 15 TAGE (V) 1.2 PULL-UP CURRENT SS HIGH PULL-DOWN CURRENT SS LOW 65 10 0.8 CURRENT (µA) THRESHOLD VOL MAXIMUM PIN CURRENT (µA) 60 5 0.4 RT PIN RP PIN 55 0 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 G13 39221 G14 39221 G15
Switching Frequency Internal PWM Frequency Internal PWM Duty Cycle
2200 260 8320 140 10.5 RT = 45.3k RT = 45.3k 2100 250 RP = 332k VREF 18.2k 7936 134 10.4 1% 2000 240 PWM 22.1k 1900 230 7552 128 Y CYCLE (%) 10.3 LT3922-1 1% 1800 220 WM FREQUENCY (Hz) 7168 122 WM DUT 10.2 1700 210 1600 200 SWITCHING FREQUENCY (kHz) 6784 116 10.1 INTERNAL P INTERNAL P 1500 RT = 45.3k 190 RP = 28.7k RT = 499k RP = 332k 1400 180 6400 110 10.0 –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 G16 39221 G17 39221 G18 Rev 0 6 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. INTVCC and VREF UVLO Falling VREF Line Regulation Thresholds Minimum Off Time
2.010 3.0 30 2.008 2.7 2.006 25 2.004 2.4 20 2.002 TAGE (V) 2.1 2.000 TAGE (V) 15 1.998 1.8 VOL 1.996 10 1.5 MINIMUM OFF TIME (ns) 1.994 THRESHOLD VOL 1.2 5 1.992 INTVCC UVLO VREF UVLO 1.990 0.9 0 0 3 6 9 12 15 18 21 24 27 30 33 36 –45 –20 5 30 55 80 105 130 155 –45 –20 5 30 55 80 105 130 155 VIN VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 39221 G10 39221 G11 39221 G12
RT and RP Pin Current Limits Soft-Start Currents Soft-Start Thresholds
80 25 2.0 75 20 1.6 70 15 TAGE (V) 1.2 PULL-UP CURRENT SS HIGH PULL-DOWN CURRENT SS LOW 65 10 0.8 CURRENT (µA) THRESHOLD VOL MAXIMUM PIN CURRENT (µA) 60 5 0.4 RT PIN RP PIN 55 0 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 G13 39221 G14 39221 G15
Switching Frequency Internal PWM Frequency Internal PWM Duty Cycle
2200 260 8320 140 10.5 RT = 45.3k RT = 45.3k 2100 250 RP = 332k VREF 18.2k 7936 134 10.4 1% 2000 240 PWM 22.1k 1900 230 7552 128 Y CYCLE (%) 10.3 LT3922-1 1% 1800 220 WM FREQUENCY (Hz) 7168 122 WM DUT 10.2 1700 210 1600 200 SWITCHING FREQUENCY (kHz) 6784 116 10.1 INTERNAL P INTERNAL P 1500 RT = 45.3k 190 RP = 28.7k RT = 499k RP = 332k 1400 180 6400 110 10.0 –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 G16 39221 G17 39221 G18 Rev 0 6 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