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LT1952 Datasheet(PDF) 3 Page - Linear Technology |
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LT1952 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 24 page  LT1952 3 1952f ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. COMP = open, FB = 1.4V, ROSC = 178k, SYNC = 0V, SS_MAXDC = VREF, VREF = 0.1µF, SD_VSEC = 2V, BLANK = 40k, DELAY = 40k, ISENSE = 0V, OC = 0V, OUT = 1nF, VIN = 15V, SOUT = open, unless otherwise specified. PARAMETER CONDITIONS MIN TYP MAX UNITS ERROR AMPLIFIER FB Reference Voltage 10V < VIN < 25V, VOL + 0.2V < COMP < VOH – 0.2 ● 1.201 1.226 1.250 V FB Input Bias Current FB = FB Reference Voltage –75 –200 nA Open Loop Voltage Gain VOL + 0.2V < COMP < VOH – 0.2 65 85 dB Unity Gain Bandwidth (Note 6) 3 MHz COMP Source Current FB = 1V, COMP = 1.6V –4 –9 mA COMP Sink Current COMP = 1.6V 4 10 mA COMP Current (Disabled) FB = VREF, COMP = 1.6V 18 23 28 µA COMP High Level: VOH FB = 1V, I(COMP) = –250µA 2.7 3.2 V COMP Active Threshold FB = 1V, SOUT Duty Cycle > 0 % 0.7 1.0 V COMP Low Level: VOL I(COMP) = 250µA 0.15 0.4 V CURRENT SENSE ISENSE Maximum Threshold COMP = 2.5V, FB = 1V 197 220 243 mV ISENSE Input Current (Duty Cycle = 0%) COMP = 2.5V, FB = 1V (Note 4) –8 µA ISENSE Input Current (Duty Cycle = 80%) COMP = 2.5V, FB = 1V (Note 4) –35 µA OC Threshold ● 98 107 116 mV OC Input Current (OC = 100mV) –50 –100 nA Default Blanking Time COMP = 2.5V, FB = 1V (Note 10) 180 ns Adjustable Blanking Time COMP = 2.5V, FB = 1V, RBLANK = 120k 540 ns VBLANK 1V SOUT DRIVER SOUT Clamp Voltage I(GATE) = 0µA, COMP = 2.5V, FB = 1V 10.5 12 13.5 V SOUT Low Level I(GATE) = 25mA 0.5 0.75 V SOUT High Level I(GATE) = –25mA, VIN = 12V, COMP = 2.5V, 10 V FB = 1V SOUT Active Pull-Off in Shutdown VIN = 5V, SD_VSEC = 0V, SOUT = 1V 1 mA SOUT to OUT (Rise) DELAY (tDELAY) COMP = 2.5V, FB = 1V (Note 10) 40 ns RDELAY = 120k 120 ns VDELAY 0.9 V OUT DRIVER OUT Rise Time FB = 1V, CL = 1nF (Notes 3, 6) 50 ns OUT Fall Time FB = 1V, CL = 1nF (Notes 3, 6) 30 ns OUT Clamp Voltage I(GATE) = 0µA, COMP = 2.5V, FB = 1V 11.5 13 14.5 V OUT Low Level I(GATE) = 20mA 0.45 0.75 V I(GATE) = 200mA 1.25 1.8 V OUT High Level I(GATE) = –20mA, VIN = 12V, COMP = 2.5V, 9.9 V FB = 1V I(GATE) = –200mA, VIN = 12V, COMP = 2.5V, 9.75 V FB = 1V OUT Active Pull-Off in Shutdown VIN = 5V, SD_VSEC = 0V, OUT = 1V 20 mA |
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