Datasheet LT3922 (Analog Devices) - 9
| Hersteller | Analog Devices |
| Beschreibung | 36V, 2A Synchronous Step-Up LED Driver |
| Seiten / Seite | 32 / 9 — Typical perForMance characTerisTics VIN = 12V, TA = 25°C, unless … |
| Dateiformat / Größe | PDF / 2.5 Mb |
| Dokumentensprache | Englisch |
Typical perForMance characTerisTics VIN = 12V, TA = 25°C, unless otherwise noted. C/10 Threshold. Case Temperature Rise
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LT3922
Typical perForMance characTerisTics VIN = 12V, TA = 25°C, unless otherwise noted. C/10 Threshold Case Temperature Rise Internal PWM Duty Cycle (10%)
18 35 350 RISING DC2247A DEMO BOARD 150°C N = 359 FALLING VLED = 30V 25°C 16 30 I 300 LED = 333mA –40°C TROOM = 25°C 25 250 14 20 200 12 TURE RISE (°C) 15 150 C/10 THRESHOLD (mV) 10 ISN NUMBER OF UNITS 10 100 – V 8 CASE TEMPERA V ISP 5 50 fSW = 2MHz fSW = 400kHz 6 0 0 –45 –20 5 30 55 80 105 130 155 4 8 12 16 20 24 28 32 8.6 9.4 10.2 11.0 11.8 TEMPERATURE (°C) VIN (V) PWM DUTY CYCLE (%) 3922 G37 3922 G38 3922 G39
Internal PWM Duty Cycle (90%) Input Voltage Transient Response Input Voltage Transient Response
300 150°C N = 359 25°C 250 –40°C VIN VIN 5V/DIV 5V/DIV 200 I 150 ILED LED 100mA/DIV 100mA/DIV 100 50 5ms/DIV 3922 G41 5ms/DIV 3922 G42 FRONT PAGE APPLICATION FRONT PAGE APPLICATION 0 6.5V to 18V INPUT VOLTAGE TRANSIENT 18V to 6.5V INPUT VOLTAGE TRANSIENT 90.2 90.6 91.4 92.2 93.0 93.4 VLED = 30V VLED = 30V PWM DUTY CYCLE (%) ILED = 333mA ILED = 333mA 3922 G40
Turn ON and OFF Performance Start-Up with 10% Internal PWM Start-Up with 50% Internal PWM
VOUT V 10V/DIV OUT V 10V/DIV IN 10V/DIV VIN 10V/DIV VIN 10V/DIV ILED I I LED LED 100mA/DIV 100mA/DIV 100mA/DIV 3922 G45 500µs/DIV 3922 G43 5ms/DIV 3922 G44 5ms/DIV FRONT PAGE APPLICATION FRONT PAGE APPLICATION WITH PWM = 1.1V FRONT PAGE APPLICATION WITH PWM = 1.5V VLED = 30V RP = 332k TO GND RP = 332k TO GND ILED = 333mA VLED = 30V VLED = 30V ILED = 333mA ILED = 333mA 3922fa For more information www.linear.com/LT3922 9 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 Revision History Typical Application Related Parts
Typical perForMance characTerisTics VIN = 12V, TA = 25°C, unless otherwise noted. C/10 Threshold Case Temperature Rise Internal PWM Duty Cycle (10%)
18 35 350 RISING DC2247A DEMO BOARD 150°C N = 359 FALLING VLED = 30V 25°C 16 30 I 300 LED = 333mA –40°C TROOM = 25°C 25 250 14 20 200 12 TURE RISE (°C) 15 150 C/10 THRESHOLD (mV) 10 ISN NUMBER OF UNITS 10 100 – V 8 CASE TEMPERA V ISP 5 50 fSW = 2MHz fSW = 400kHz 6 0 0 –45 –20 5 30 55 80 105 130 155 4 8 12 16 20 24 28 32 8.6 9.4 10.2 11.0 11.8 TEMPERATURE (°C) VIN (V) PWM DUTY CYCLE (%) 3922 G37 3922 G38 3922 G39
Internal PWM Duty Cycle (90%) Input Voltage Transient Response Input Voltage Transient Response
300 150°C N = 359 25°C 250 –40°C VIN VIN 5V/DIV 5V/DIV 200 I 150 ILED LED 100mA/DIV 100mA/DIV 100 50 5ms/DIV 3922 G41 5ms/DIV 3922 G42 FRONT PAGE APPLICATION FRONT PAGE APPLICATION 0 6.5V to 18V INPUT VOLTAGE TRANSIENT 18V to 6.5V INPUT VOLTAGE TRANSIENT 90.2 90.6 91.4 92.2 93.0 93.4 VLED = 30V VLED = 30V PWM DUTY CYCLE (%) ILED = 333mA ILED = 333mA 3922 G40
Turn ON and OFF Performance Start-Up with 10% Internal PWM Start-Up with 50% Internal PWM
VOUT V 10V/DIV OUT V 10V/DIV IN 10V/DIV VIN 10V/DIV VIN 10V/DIV ILED I I LED LED 100mA/DIV 100mA/DIV 100mA/DIV 3922 G45 500µs/DIV 3922 G43 5ms/DIV 3922 G44 5ms/DIV FRONT PAGE APPLICATION FRONT PAGE APPLICATION WITH PWM = 1.1V FRONT PAGE APPLICATION WITH PWM = 1.5V VLED = 30V RP = 332k TO GND RP = 332k TO GND ILED = 333mA VLED = 30V VLED = 30V ILED = 333mA ILED = 333mA 3922fa For more information www.linear.com/LT3922 9 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 Revision History Typical Application Related Parts