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LT3755 Datasheet(PDF) 3 Page - Linear Integrated Systems |
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LT3755 Datasheet(HTML) 3 Page - Linear Integrated Systems |
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3 / 30 page  LT3922 3 3922f For more information www.linear.com/LT3922 elecTrical characTerisTics PARAMETER CONDITIONS MIN TYP MAX UNITS Reference VREF Voltage IVREF = 0µA IVREF = 500µA l 1.97 1.985 2 2 2.03 2.015 V V VREF Pin Current Limit VREF = 0V, Current Out of Pin 3.2 mA LED Current Regulation CTRL-Off Threshold (Falling) l 200 210 220 mV CTRL-Off Rising Hysteresis 15 mV CTRL Pin Current VCTRL = 2V −100 100 nA Sense Voltage (VISP−VISN) (Analog Input) VCTRL = 2V (100%), VISP = 24V VCTRL = 0.75V (50%), VISP = 24V VCTRL = 0.3V (5%), VISP = 24V l l l 98 48.5 4 100 50 5 102 51.5 6 mV mV mV ISP Pin Current VISP = 24.1V, VISN = 24V, VCTRL = 2V 75 µA ISN Pin Current VISP = 24.1V, VISN = 24V , VCTRL = 2V 75 µA Current Error Amplifier Transconductance VISP = 24V 140 µA/V Duty Cycle Control of LED Current Sense Voltage (VISP−VISN) (Duty Cycle Input) CTRL Duty = 75% (100%), VISP = 24V CTRL Duty = 37.5% (50%), VISP = 24V CTRL Duty = 15% (5%), VISP = 24V 99 49 4 100 50 5 101 51 6 mV mV mV CTRL Pulse Input High (VIH) 1.6 V CTRL Pulse Input Low (VIL) 0.4 V CTRL Pulse Input Frequency Range 10 200 kHz Voltage Regulation FB Regulation Voltage VCTRL = 2V l 1.175 1.200 1.225 V FB Pin Current FB in Regulation −100 100 nA Voltage Error Amplifier Transconductance 1000 µA/V INTVCC Regulator INTVCC Voltage 2.7 3 3.3 V INTVCC Pin Current Limit VINTVCC = 0V, Current Out of Pin 20 mA Power Stage Peak Current Limit 2.0 2.3 2.6 A Bottom Switch Minimum Off-Time l 15 25 35 ns Bottom Switch On-Resistance 140 mΩ Top Switch On-Resistance 155 mΩ Oscillator Programmed Switching Frequency (fSW) RT = 45.3k, VSYNC/SPRD = 0V RT = 499k, VSYNC/SPRD = 0V l l 1880 175 2000 210 2120 245 kHz kHz Spread Spectrum Frequency Range RT = 45.3k, VSYNC/SPRD = 3V RT = 499k, VSYNC/SPRD = 3V 1880 175 2650 306 kHz kHz RT Pin Current Limit VRT = 0V, Current Out of Pin 75 µA SYNC/SPRD Threshold (Rising) 1.4 1.5 V SYNC/SPRD Falling Hysteresis 0.2 V SYNC/SPRD Pin Current VSYNC/SPRD = 5V −100 100 nA The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C, VIN = 12V, VEN/UVLO = 2V unless otherwise noted. |
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