Datasheet LTC6255, LTC6256, LTC6257 (Analog Devices) - 26

LTC6255/LTC6256/LTC6257
TYPICAL APPLICATION 2µs Rise Time Analog 1A Pulsed LED Current Driver. Time Domain Response Showing 2µs Rise Time. Top LTC6255 Applied as a LED Current Driver with 2µs Rise Time Waveform Is VIN. Middle Waveform Is the 10mA to 1A Step Measured at R3, then the 0mA to 1A Step Showing Extra
I 5V LED = VIN • 200mA/V
2.7µs Delay When Recovering From 0mA
5V LED R1 ILED OSRAM 9.76k + SHDN LRW5SM V R4 IN 51Ω V Q1 Q2 Q3 IN R2 LTC6255 200Ω – Q1 TO Q3 MOSFETs C1 RSD 3× 2N7000 10mA TO 1A 220pF R 100k* UP R5 1M** 240Ω 5V R3 0mA TO 1A 0.1Ω * RSD GUARANTEES LED OFF WHEN OP AMP SHDN. OTHERWISE OPTIONAL. (EXTRA DELAY) 100mW ** RUP FORCES LED COMPLETELY OFF WHEN VIN = 0. OTHERWISE OPTIONAL. STANDBY SUPPLY CURRENT WITH V 625567 TA02b 625567 TA02a IN = 0: 65µA RUP OPEN 650µA RUP INSTALLED 10% TO 90% RISE TIME: 10mA TO 1A, 2µs 0mA TO 1A, ADD 2.7µs DELAY
RELATED PARTS PART NUMBER DESCRIPTION COMMENTS
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